Mitsubishi Outlander: Diagnostic Item 26

DIAGNOSTIC ITEM 26: Short to power supply or ground, open circuit or line-to-line short in the CAN-B bus lines.

CAUTION When servicing a CAN bus line, ground yourself by touching a metal object such as an unpainted water pipe. If you fail to do so, a component connected to the CAN bus line may be damaged.

CAN Communication Circuit

CAN Communication Circuit

FUNCTION

If a short to power supply or ground, open circuit or line-to-line short is present at either CAN_H or CAN_L side on the CAN-B lines, this diagnosis result will be set.

TROUBLE JUDGMENT CONDITIONS

When CAN-B lines communication is normal, and diagnostic trouble code U0019 is set, the ETACS-ECU determines that there is a failure.

TROUBLESHOOTING HINTS

• Malfunction of the connector (short to power supply or ground in connector or improperly connected)
• Malfunction of the wiring harness (short to power supply or ground, open circuit or line-to-line short in CAN bus lines)
• Faulty ECU(s) (internal short to power supply or ground)

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set
• MB992006: Extra Fine Probe

STEP 1. Check the wiring harness between ETACS-ECU connector C-301 and body ground for a short to ground.

Measure the resistance at ETACS-ECU connector C-301.

CAUTION Disconnect the negative battery terminal. CAUTION A digital multimeter should be used.

CAUTION The test wiring harness should be used.

(1) Disconnect ETACS-ECU connector C-301, and measure the voltage at the wiring harness side of ETACS-ECU connector.

(2) Measure the resistance between ETACS-ECU connector terminal 6 and body ground.

OK: 1 kΩ or more

(3) Measure the resistance between ETACS-ECU connector terminal 7 and body ground.

OK: 1 kΩ or more

Q: Do all the resistances measure 1 kΩ or more?

YES : Go to Step 2.

NO : Go to Step 12.

STEP 2. Check the wiring harness between joint connector (CAN1) C-103 and combination meter connector C-03 for a short to ground. Measure the resistance at joint connector (CAN1) C-103.

(1) Disconnect joint connector (CAN1), and measure the resistance at the wiring harness side of joint connector (CAN1).

(2) Measure the resistance between joint connector (CAN1) terminal 4 and body ground.

OK: 1 kΩ or more

(3) Measure the resistance between joint connector (CAN1) terminal 15 and body ground.

OK: 1 kΩ or more

Q: Do all the resistances measure 1 kΩ or more?

YES (vehicles with KOS) : Go to Step 3.

YES (vehicles with WCM) : Go to Step 4.

NO (vehicles with KOS or WCM) : Go to Step 44.

STEP 3. Check the wiring harness between joint connector (CAN1) C-103 and KOS-ECU connector C-102 for a short to ground. Measure the resistance at joint connector (CAN1) C-103.

(1) Disconnect joint connector (CAN1), and measure the resistance at the wiring harness side of joint connector (CAN1).

(2) Measure the resistance between joint connector (CAN1) terminal 8 and body ground.

OK: 1 kΩ or more

(3) Measure the resistance between joint connector (CAN1) terminal 21 and body ground.

OK: 1 kΩ or more

Q: Do all the resistances measure 1 kΩ or more?

YES : Go to Step 5.

NO : Go to Step 45.

STEP 4. Check the wiring harness between joint connector (CAN1) C-103 and WCM connector C-29 for a short to ground. Measure the resistance at joint connector (CAN1) C-103.

(1) Disconnect joint connector (CAN1), and measure the resistance at the wiring harness side of joint connector (CAN1).

(2) Measure the resistance between joint connector (CAN1) terminal 5 and body ground.

OK: 1 kΩ or more

(3) Measure the resistance between joint connector (CAN1) terminal 16 and body ground.

OK: 1 kΩ or more

Q: Do all the resistances measure 1 kΩ or more?

YES : Go to Step 5.

NO : Go to Step 46.

STEP 5. Check the wiring harness between joint connector (CAN1) C-103 and SRS-ECU connector C-28 for a short to ground. Measure the resistance at joint connector (CAN1) C-103.

(1) Disconnect joint connector (CAN1), and measure the resistance at the wiring harness side of joint connector (CAN1).

(2) Measure the resistance between joint connector (CAN1) terminal 2 and body ground.

OK: 1 kΩ or more

(3) Measure the resistance between joint connector (CAN1) terminal 13 and body ground.

OK: 1 kΩ or more

Q: Do all the resistances measure 1 kΩ or more?

YES : Go to Step 6.

NO : Go to Step 47.

STEP 6. Check the wiring harness between joint connector (CAN1) C-103 and occupant classification-ECU connector D-34-2 for a short to ground. Measure the resistance at joint connector (CAN1) C-103.

(1) Disconnect joint connector (CAN1), and measure the resistance at the wiring harness side of joint connector (CAN1).

(2) Measure the resistance between joint connector (CAN1) terminal 11 and body ground.

OK: 1 kΩ or more

(3) Measure the resistance between joint connector (CAN1) terminal 24 and body ground.

OK: 1 kΩ or more

Q: Do all the resistances measure 1 kΩ or more?

YES : Go to Step 7.

NO : Go to Step 48.

STEP 7. Check the wiring harness between joint connector (CAN1) C-103 and A/C-ECU connector C-109 for a short to ground. Measure the resistance at joint connector (CAN1) C-103.

(1) Disconnect joint connector (CAN1), and measure the resistance at the wiring harness side of joint connector (CAN1).

(2) Measure the resistance between joint connector (CAN1) terminal 9 and body ground.

OK: 1 kΩ or more

(3) Measure the resistance between joint connector (CAN1) terminal 22 and body ground.

OK: 1 kΩ or more

Q: Do all the resistances measure 1 kΩ or more?

YES (vehicles without MMCS) : Go to Step 8.

YES (vehicles with MMCS) : Go to Step 9.

NO : Go to Step 49.

STEP 8. Check the wiring harness between joint connector (CAN1) C-103 and radio and CD player or radio and CD changer connector C-16 for a short to ground. Measure the resistance at joint connector (CAN1) C-103.

(1) Disconnect joint connector (CAN1), and measure the resistance at the wiring harness side of joint connector (CAN1).

(2) Measure the resistance between joint connector (CAN1) terminal 10 and body ground.

OK: 1 kΩ or more

(3) Measure the resistance between joint connector (CAN1) terminal 23 and body ground.

OK: 1 kΩ or more

Q: Do all the resistances measure 1 kΩ or more?

YES (vehicles without satellite radio) : Go to Step 11.

YES (vehicles with satellite radio) : Go to Step 10.

NO : Go to Step 50.

STEP 9. Check the wiring harness between joint connector (CAN1) C-103 and CAN box unit connector for a short to ground. Measure the resistance at joint connector (CAN1) C-103.

(1) Disconnect joint connector (CAN1), and measure the resistance at the wiring harness side of joint connector (CAN1).

(2) Measure the resistance between joint connector (CAN1) terminal 10 and body ground.

OK: 1 kΩ or more

(3) Measure the resistance between joint connector (CAN1) terminal 23 and body ground.

OK: 1 kΩ or more

Q: Do all the resistances measure 1 kΩ or more?

YES (vehicles without satellite radio) : Go to Step 11.

YES (vehicles with satellite radio) : Go to Step 10.

NO : Go to Step 51.

STEP 10. Check the wiring harness between joint connector (CAN1) C-103 and satellite radio tuner connector C-111 for a short to ground. Measure the resistance at joint connector (CAN1) C-103.

(1) Disconnect joint connector (CAN1), and measure the resistance at the wiring harness side of joint connector (CAN1).

(2) Measure the resistance between joint connector (CAN1) terminal 3 and body ground.

OK: 1 kΩ or more

(3) Measure the resistance between joint connector (CAN1) terminal 14 and body ground.

OK: 1 kΩ or more

Q: Do all the resistances measure 1 kΩ or more?

YES : Go to Step 11.

NO : Go to Step 52.

STEP 11. Check the wiring harness between joint connector (CAN1) C-103 and ETACS-ECU connector C-301 for a short to ground. Measure the resistance at joint connector (CAN1) C-103.

(1) Disconnect joint connector (CAN1) and ETACS-ECU connector C-301, and measure the resistance at the wiring harness side of joint connector (CAN1).

(2) Measure the resistance between joint connector (CAN1) terminal 6 and body ground.

OK: 1 kΩ or more

(3) Measure the resistance between joint connector (CAN1) terminal 19 and body ground.

OK: 1 kΩ or more

Q: Do all the resistances measure 1 kΩ or more?

YES : Go to Step 53.

NO : Repair the wiring harness between joint connector (CAN1) C-103 and ETACS-ECU connector C-301.

STEP 12. Check the wiring harness between ETACS-ECU connector C-301 and body ground for a short to power supply. Measure the voltage at ETACS-ECU connector C-301.

(1) Disconnect ETACS-ECU connector C-301, and measure the voltage at the wiring harness side of ETACS-ECU connector.

(2) Turn the ignition switch to the ON position.

(3) Measure the voltage between ETACS-ECU connector terminal 6 and body ground.

OK: 4.7 volts or less

(4) Measure the voltage between ETACS-ECU connector terminal 7 and body ground.

OK: 4.7 volts or less

Q: Do all the voltages measure 4.7 volts or less?

YES : Go to Step 23.

NO : Go to Step 13.

STEP 13. Check the wiring harness between joint connector (CAN1) C-103 and combination meter connector C-03 for a short to power supply. Measure the voltage at joint connector (CAN1) C-103.

(1) Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1).

(2) Connect the negative battery terminal.

(3) Turn the ignition switch to the ON position.

(4) Measure the voltage between joint connector (CAN1) terminal 4 and body ground.

OK: 4.7 volts or less

(5) Measure the voltage between joint connector (CAN1) terminal 15 and body ground.

OK: 4.7 volts or less

Q: Do all the voltages measure 4.7 volts or less?

YES (vehicles with KOS) : Go to Step 14.

YES (vehicles with WCM) : Go to Step 15.

NO (vehicles with KOS and WCM) : Go to Step 44.

STEP 14. Check the wiring harness between joint connector (CAN1) C-103 and KOS-ECU connector C-102 for a short to power supply. Measure the voltage at joint connector (CAN1) C-103.

(1) Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1).

(2) Turn the ignition switch to the ON position.

(3) Measure the voltage between joint connector (CAN1) terminal 8 and body ground.

OK: 4.7 volts or less

(4) Measure the voltage between joint connector (CAN1) terminal 21 and body ground.

OK: 4.7 volts or less

Q: Do all the voltages measure 4.7 volts or less?

YES : Go to Step 16.

NO : Go to Step 45.

STEP 15. Check the wiring harness between joint connector (CAN1) C-103 and WCM connector C-29 for a short to power supply. Measure the voltage at joint connector (CAN1) C-103.

(1) Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1).

(2) Turn the ignition switch to the ON position.

(3) Measure the voltage between joint connector (CAN1) terminal 5 and body ground.

OK: 4.7 volts or less

(4) Measure the voltage between joint connector (CAN1) terminal 16 and body ground.

OK: 4.7 volts or less

Q: Do all the voltages measure 4.7 volts or less?

YES : Go to Step 16.

NO : Go to Step 46.

STEP 16. Check the wiring harness between joint connector (CAN1) C-103 and SRS-ECU connector C-28 for a short to power supply. Measure the voltage at joint connector (CAN1) C-103.

(1) Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1).

(2) Turn the ignition switch to the ON position.

(3) Measure the voltage between joint connector (CAN1) terminal 2 and body ground.

OK: 4.7 volts or less

(4) Measure the voltage between joint connector (CAN1) terminal 13 and body ground.

OK: 4.7 volts or less

Q: Do all the voltages measure 4.7 volts or less?

YES : Go to Step 17.

NO : Go to Step 47.

STEP 17. Check the wiring harness between joint connector (CAN1) C-103 and occupant classification-ECU connector D-34-2 for a short to power supply. Measure the voltage at joint connector (CAN1) C-103.

(1) Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1).

(2) Turn the ignition switch to the ON position.

(3) Measure the voltage between joint connector (CAN1) terminal 11 and body ground.

OK: 4.7 volts or less

(4) Measure the voltage between joint connector (CAN1) terminal 24 and body ground.

OK: 4.7 volts or less

Q: Do all the voltages measure 4.7 volts or less?

YES : Go to Step 18.

NO : Go to Step 48.

STEP 18. Check the wiring harness between joint connector (CAN1) C-103 and A/C-ECU connector C-109 for a short to power supply. Measure the voltage at joint connector (CAN1) C-103.

(1) Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1).

(2) Turn the ignition switch to the ON position.

(3) Measure the voltage between joint connector (CAN1) terminal 9 and body ground.

OK: 4.7 volts or less

(4) Measure the voltage between joint connector (CAN1) terminal 22 and body ground.

OK: 4.7 volts or less

Q: Do all the voltages measure 4.7 volts or less?

YES (vehicles without MMCS) : Go to Step 19.

YES (vehicles with MMCS) : Go to Step 20.

NO : Go to Step 49.

STEP 19. Check the wiring harness between joint connector (CAN1) C-103 and radio and CD player or radio and CD changer connector C-16 for a short to power supply. Measure the voltage at joint connector (CAN1) C-103.

(1) Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1).

(2) Turn the ignition switch to the ON position.

(3) Measure the voltage between joint connector (CAN1) terminal 10 and body ground.

OK: 4.7 volts or less

(4) Measure the voltage between joint connector (CAN1) terminal 23 and body ground.

OK: 4.7 volts or less

Q: Do all the voltages measure 4.7 volts or less?

YES (vehicles without satellite radio) : Go to Step 22.

YES (vehicles with satellite radio) : Go to Step 21.

NO : Go to Step 50.

STEP 20. Check the wiring harness between joint connector (CAN1) C-103 and CAN box unit connector C-13 for a short to power supply. Measure the voltage at joint connector (CAN1) C-103.

(1) Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1).

(2) Turn the ignition switch to the ON position.

(3) Measure the voltage between joint connector (CAN1) terminal 10 and body ground.

OK: 4.7 volts or less

(4) Measure the voltage between joint connector (CAN1) terminal 23 and body ground.

OK: 4.7 volts or less

Q: Do all the voltages measure 4.7 volts or less?

YES (vehicles without satellite radio) : Go to Step 22.

YES (vehicles with satellite radio) : Go to Step 21.

NO : Go to Step 51.

STEP 21. Check the wiring harness between joint connector (CAN1) C-103 and satellite radio tuner connector C-111 for a short to power supply. Measure the voltage at joint connector (CAN1) C-103.

(1) Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1).

(2) Turn the ignition switch to the ON position.

(3) Measure the voltage between joint connector (CAN1) terminal 3 and body ground.

OK: 4.7 volts or less

(4) Measure the voltage between joint connector (CAN1) terminal 14 and body ground.

OK: 4.7 volts or less

Q: Do all the voltages measure 4.7 volts or less?

YES : Go to Step 22.

NO : Go to Step 52.

STEP 22. Check the wiring harness between joint connector (CAN1) C-103 and ETACS-ECU connector C-301 for a short to power supply. Measure the voltage at joint connector (CAN1) C-103.

(1) Disconnect joint connector (CAN1) and ETACS-ECU connector C-301, and measure the voltage at the wiring harness side of joint connector (CAN1).

(2) Turn the ignition switch to the ON position.

(3) Measure the voltage between joint connector (CAN1) terminal 6 and body ground.

OK: 1.0 volts or less

(4) Measure the voltage between joint connector (CAN1) terminal 19 and body ground.

OK: 1.0 volts or less

Q: Do all the voltages measure 1.0 volts or less?

YES : Go to Step 53.

NO : Repair the wiring harness between joint connector (CAN1) C-103 and ETACS-ECU connector C-301.

STEP 23. Check the wiring harness for line-to-line short.

Measure the resistance at ETACS-ECU connector C-301.

CAUTION Disconnect the negative battery terminal.

(1) Disconnect ETACS-ECU connector C-301, and check that there is continuity at the harness side of ETACS-ECU.

(2) Check that there is continuity between ETACS-ECU connector terminals 6 and 7.

OK: No continuity

Q: Is the check result normal?

YES : Go to Step 34.

NO : Go to Step 24.

STEP 24. Check the wiring harness between joint connector (CAN1) C-103 and combination meter connector C-03 for line-to-line short. Measure the resistance at joint connector (CAN1) C-103.

(1) Disconnect joint connector (CAN1), and check that there is continuity at the harness side of joint connector (CAN1).

(2) Check that there is continuity between joint connector (CAN1) terminals 4 and 15.

OK: No continuity

Q: Is the check result normal?

YES (vehicles with KOS) : Go to Step 25.

YES (vehicles with WCM) : Go to Step 26.

NO (vehicles with KOS or WCM) : Go to Step 44.

STEP 25. Check the wiring harness between joint connector (CAN1) C-103 and KOS-ECU connector C-102 for line-to-line short. Measure the resistance at joint connector (CAN1) C-103.

(1) Disconnect joint connector (CAN1), and check that there is continuity at the harness side of joint connector (CAN1).

(2) Check that there is continuity between joint connector (CAN1) terminals 8 and 21.

OK: No continuity

Q: Is the check result normal?

YES : Go to Step 27.

NO : Go to Step 45.

STEP 26. Check the wiring harness between joint connector (CAN1) C-103 and WCM connector C-29 for line-to-line short. Measure the resistance at joint connector (CAN1) C-103.

(1) Disconnect joint connector (CAN1), and check that there is continuity at the harness side of joint connector (CAN1).

(2) Check that there is continuity between joint connector (CAN1) terminals 5 and 16.

OK: No continuity

Q: Is the check result normal?

YES : Go to Step 27.

NO : Go to Step 46.

STEP 27. Check the wiring harness between joint connector (CAN1) C-103 and SRS-ECU connector C-28 for line-to-line short. Measure the resistance at joint connector (CAN1) C-103.

(1) Disconnect joint connector (CAN1), and check that there is continuity at the harness side of joint connector (CAN1).

(2) Check that there is continuity between joint connector (CAN1) terminals 2 and 13.

OK: No continuity

Q: Is the check result normal?

YES : Go to Step 28.

NO : Go to Step 47.

STEP 28. Check the wiring harness between joint connector (CAN1) C-103 and occupant classification-ECU connector D-34-2 for line-to-line short. Measure the resistance at joint connector (CAN1) C-103.

(1) Disconnect joint connector (CAN1), and check that there is continuity at the harness side of joint connector (CAN1).

(2) Check that there is continuity between joint connector (CAN1) terminals 11 and 24.

OK: No continuity

Q: Is the check result normal?

YES : Go to Step 29.

NO : Go to Step 48.

STEP 29. Check the wiring harness between joint connector (CAN1) C-103 and A/C-ECU connector C-109 for line-to-line short. Measure the resistance at joint connector (CAN1) C-103.

(1) Disconnect joint connector (CAN1), and check that there is continuity at the harness side of joint connector (CAN1).

(2) Check that there is continuity between joint connector (CAN1) terminals 9 and 22.

OK: No continuity

Q: Is the check result normal?

YES (vehicles without MMCS) : Go to Step 30.

YES (vehicles with MMCS) : Go to Step 31.

NO : Go to Step 49.

STEP 30. Check the wiring harness between joint connector (CAN1) C-103 and radio and CD player or radio and CD changer connector C-16 for line-to-line short.

Measure the resistance at joint connector (CAN1) C-103.

(1) Disconnect joint connector (CAN1), and check that there is continuity at the harness side of joint connector (CAN1).

(2) Check that there is continuity between joint connector (CAN1) terminals 10 and 23.

OK: No continuity

Q: Is the check result normal?

YES (vehicles without satellite radio) : Go to Step 33.

YES (vehicles with satellite radio) : Go to Step 32.

NO : Go to Step 50.

STEP 31. Check the wiring harness between joint connector (CAN1) C-103 and CAN box unit connector C-13 for line-to-line short. Measure the resistance at joint connector (CAN1) C-103.

(1) Disconnect joint connector (CAN1), and check that there is continuity at the harness side of joint connector (CAN1).

(2) Check that there is continuity between joint connector (CAN1) terminals 10 and 23.

OK: No continuity.

Q: Is the check result normal?

YES (vehicles without satellite radio) : Go to Step 33.

YES (vehicles with satellite radio) : Go to Step 32.

NO : Go to Step 51.

STEP 32. Check the wiring harness between joint connector (CAN1) C-103 and satellite radio tuner connector C-111 for line-to-line short. Measure the resistance at joint connector (CAN1) C-103.

(1) Disconnect joint connector (CAN1), and check that there is continuity at the harness side of joint connector (CAN1).

(2) Check that there is continuity between joint connector (CAN1) terminals 3 and 14.

OK: No continuity.

Q: Is the check result normal?

YES : Go to Step 33.

NO : Go to Step 52.

STEP 33. Check the wiring harness between joint connector (CAN1) C-103 and EATCS-ECU connector C-301 for line-to-line short. Measure the resistance at joint connector (CAN1) C-103.

CAUTION Strictly observe the specified wiring harness repair procedure.

(1) Disconnect joint connector (CAN1) and ETACS-ECU connector C-301, and check that there is continuity at the harness side of joint connector (CAN1).

(2) Check that there is continuity between joint connector (CAN1) terminals 6 and 19.

OK: No continuity.

Q: Is the check result normal?

YES : Go to Step 53.

NO : Repair the wiring harness between joint connector (CAN1) C-103 and ETACS-ECU connector C-301.

STEP 34. Check the wiring harness between joint connector (CAN1) C-103 and combination meter connector C-03 for open circuit.

CAUTION Strictly observe the specified wiring harness repair procedure.

(1) Disconnect joint connector (CAN1) C-103 and combination meter connector C-03, and check the wiring harness.

(2) Check the wiring harness between joint connector (CAN1) C-103 (terminal No.4) and combination meter connector C-03 (terminal No.14) OK: Continuity exists (2 ohms or less)

(3) Check the wiring harness between joint connector (CAN1) C-103 (terminal No.15) and combination meter connector C-03 (terminal No.15).

OK: Continuity exists (2 ohms or less).

Q: Is the wiring harness between joint connector (CAN1) C-103 and combination meter connector C-03 in good condition?

YES (vehicles with KOS) : Go to Step 35.

YES (vehicles with WCM) : Go to Step 36.

NO (vehicles with KOS or WCM) : Repair the wiring harness between joint connector (CAN1) C-103 and combination meter connector C-03.

STEP 35. Check the wiring harness between joint connector (CAN1) C-103 and KOS-ECU connector C-102 for open circuit.

CAUTION Strictly observe the specified wiring harness repair procedure.

(1) Disconnect joint connector (CAN1) C-103 and KOS-ECU connector C-102, and check the wiring harness.

(2) Check the wiring harness between joint connector (CAN1) C-103 (terminal No.8) and KOS-ECU connector C-102 (terminal No.1).

OK: Continuity exists (2 ohms or less).

(3) Check the wiring harness between joint connector (CAN1) C-103 (terminal No.21) and KOS-ECU connector C-102 (terminal No.2).

OK: Continuity exists (2 ohms or less).

Q: Is the wiring harness between joint connector (CAN1) C-103 and KOS-ECU connector C-102 in good condition?

YES : Go to Step 37.

NO : Repair the wiring harness between joint connector (CAN1) C-103 and KOS-ECU connector C-102.

STEP 36. Check the wiring harness between joint connector (CAN1) C-103 and WCM connector C-29 for open circuit.

CAUTION Strictly observe the specified wiring harness repair procedure.

(1) Disconnect joint connector (CAN1) C-103 and WCM connector C-29, and check the wiring harness.

(2) Check the wiring harness between joint connector (CAN1) C-103 (terminal No.5) and WCM connector C-29 (terminal No.11).

OK: Continuity exists (2 ohms or less).

(3) Check the wiring harness between joint connector (CAN1) C-103 (terminal No.16) and WCM connector C-29 (terminal No.2).

OK: Continuity exists (2 ohms or less).

Q: Is the wiring harness between joint connector (CAN1) C-103 and WCM connector C-29 in good condition?

YES : Go to Step 37.

NO : Repair the wiring harness between joint connector (CAN1) C-103 and WCM connector C-29.

STEP 37. Check the wiring harness between joint connector (CAN1) C-103 and SRS-ECU connector C-28 for open circuit.

CAUTION Strictly observe the specified wiring harness repair procedure.

(1) Disconnect joint connector (CAN1) C-103 and SRS-ECU connector C-28, and check the wiring harness.

(2) Check the wiring harness between joint connector (CAN1) C-103 (terminal No.2) and SRS-ECU connector C-28 (terminal No.15).

OK: Continuity exists (2 ohms or less)

(3) Check the wiring harness between joint connector (CAN1) C-103 (terminal No.13) and SRS-ECU connector C-28 (terminal No.16).

OK: Continuity exists (2 ohms or less).

Q: Is the wiring harness between joint connector (CAN1) C-103 and SRS-ECU connector C-28 in good condition?

YES : Go to Step 38.

NO : Repair the wiring harness between joint connector (CAN1) C-103 and SRS-ECU connector C-28.

STEP 38. Check the wiring harness between joint connector (CAN1) C-103 and occupant classification-ECU connector D-34-2 for open circuit.

CAUTION Strictly observe the specified wiring harness repair procedure.

(1) Disconnect joint connector (CAN1) C-103 and occupant classification-ECU connector D-34-2, and check the wiring harness.

(2) Check the wiring harness between joint connector (CAN1) C-103 (terminal No.11) and occupant classification-ECU connector D-34-2 (terminal No.24).

OK: Continuity exists (2 ohms or less)

(3) Check the wiring harness between joint connector (CAN1) C-103 (terminal No.24) and occupant classification-ECU connector D-34-2 (terminal No.25).

OK: Continuity exists (2 ohms or less).

Q: Is the wiring harness between joint connector (CAN1) C-103 and occupant classification-ECU connector D-34-2 in good condition?

YES : Go to Step 39.

NO : Repair the wiring harness between joint connector (CAN1) C-103 and occupant classification-ECU connector D-34-2.

STEP 39. Check the wiring harness between joint connector (CAN1) C-103 and A/C-ECU connector C-109 for open circuit.

CAUTION Strictly observe the specified wiring harness repair procedure.

(1) Disconnect joint connector (CAN1) C-103 and A/C-ECU connector C-109, and check the wiring harness.

(2) Check the wiring harness between joint connector (CAN1) C-103 (terminal No.9) and A/C-ECU connector C-109 (terminal No.11).

OK: Continuity exists (2 ohms or less).

(3) Check the wiring harness between joint connector (CAN1) C-103 (terminal No.22) and A/C-ECU connector C-109 (terminal No.12).

OK: Continuity exists (2 ohms or less).

Q: Is the wiring harness between joint connector (CAN1) C-103 and A/C-ECU connector C-109 in good condition?

YES (vehicles without MMCS) : Go to Step 40.

YES (vehicles with MMCS) : Go to Step 41.

NO : Repair the wiring harness between joint connector (CAN1) C-103 and A/C-ECU connector C-109.

STEP 40. Check the wiring harness between joint connector (CAN1) C-103 and radio and CD player or CD changer connector C-16 for open circuit.

CAUTION Strictly observe the specified wiring harness repair procedure.

(1) Disconnect joint connector (CAN1) C-103 and radio and CD player or CD changer connector C-16, and check the wiring harness.

(2) Check the wiring harness between joint connector (CAN1) C-103 (terminal No.10) and radio and CD player or CD changer connector C-16 (terminal No.23).

OK: Continuity exists (2 ohms or less).

(3) Check the wiring harness between joint connector (CAN1) C-103 (terminal No.23) and radio and CD player or CD changer connector C-16 (terminal No.33).

OK: Continuity exists (2 ohms or less).

Q: Is the wiring harness between joint connector (CAN1) C-103 and radio and CD player or CD changer connector C-16 in good condition?

YES (vehicles without satellite radio) : Go to Step 43.

YES (vehicles with satellite radio) : Go to Step 42.

NO : Repair the wiring harness between joint connector (CAN1) C-103 and radio and CD player or CD changer connector C-16.

STEP 41. Check the wiring harness between joint connector (CAN1) C-103 and CAN box unit connector C-13 for open circuit.

CAUTION Strictly observe the specified wiring harness repair procedure.

(1) Disconnect joint connector (CAN1) C-103 and CAN box unit connector C-13, and check the wiring harness.

(2) Check the wiring harness between joint connector (CAN1) C-103 (terminal No.10) and CAN box unit connector C-13 (terminal No.8).

OK: Continuity exists (2 ohms or less).

(3) Check the wiring harness between joint connector (CAN1) C-103 (terminal No.23) and CAN box unit connector C-13 (terminal No.9).

OK: Continuity exists (2 ohms or less).

Q: Is the wiring harness between joint connector (CAN1) C-103 and CAN box unit connector C-13 in good condition?

YES (vehicles without satellite radio) : Go to Step 43.

YES (vehicles with satellite radio) : Go to Step 42.

NO : Repair the wiring harness between joint connector (CAN1) C-103 and CAN box unit connector C-13.

STEP 42. Check the wiring harness between joint connector (CAN1) C-103 and satellite radio tuner connector C-111 for open circuit.

CAUTION Strictly observe the specified wiring harness repair procedure.

(1) Disconnect joint connector (CAN1) C-103 and satellite radio tuner connector C-111, and check the wiring harness.

(2) Check the wiring harness between joint connector (CAN1) C-103 (terminal No.3) and satellite radio tuner connector C-111 (terminal No.4).

OK: Continuity exists (2 ohms or less).

(3) Check the wiring harness between joint connector (CAN1) C-103 (terminal No.14) and satellite radio tuner connector C-111 (terminal No.11).

OK: Continuity exists (2 ohms or less).

Q: Is the wiring harness between joint connector (CAN1) C-103 and satellite radio tuner connector C-111 in good condition?

YES : Go to Step 43.

NO : Repair the wiring harness between joint connector (CAN1) C-103 and satellite radio tuner connector C-111.

STEP 43. Check the wiring harness between joint connector (CAN1) C-103 and ETACS-ECU connector C-301 for open circuit.

CAUTION Strictly observe the specified wiring harness repair procedure.

(1) Disconnect joint connector (CAN1) C-103 and ETACS-ECU connector C-301, and check the wiring harness.

(2) Check the wiring harness between joint connector (CAN1) C-103 (terminal No.6) and ETACS-ECU connector C-301 (terminal No.6).

OK: Continuity exists (2 ohms or less).

(3) Check the wiring harness between joint connector (CAN1) C-103 (terminal No.19) and ETACS-ECU connector C-301 (terminal No.7).

OK: Continuity exists (2 ohms or less).

Q: Is the wiring harness between joint connector (CAN1) C-103 and ETACS-ECU connector C-301 in good condition?

YES : Go to Step 53.

NO : Repair the wiring harness between joint connector (CAN1) C-103 and ETACS-ECU connector C-301.

STEP 44. Using scan tool MB991958, diagnose the CAN bus line. (checking the combination meter for internal failure).

CAUTION Strictly observe the specified wiring harness repair procedure.

CAUTION To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

(1) Disconnect combination meter connector C-03.

(2) Connect scan tool MB991958 to the data link connector.

(3) Turn the ignition switch to the "ON" position.

(4) Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the figure.

OK: The display of the scan tool MB991958 is as shown in the figure.

Q: Does scan tool MB991958 screen correspond to the illustration?

YES : Repair the wiring harness between joint connector (CAN1) C-103 and combination meter connector C-03.

NO : Check combination meter connector C-03, and repair if necessary. If the combination meter connector is in good condition, replace the combination meter.

STEP 45. Using scan tool MB991958, diagnose the CAN bus line. (checking the KOS-ECU for internal failure)

CAUTION Strictly observe the specified wiring harness repair procedure.

CAUTION To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

(1) Disconnect KOS-ECU connector C-102.

(2) Connect scan tool MB991958 to the data link connector.

(3) Turn the ignition switch to the "ON" position.

(4) Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the figure.

OK: The display of the scan tool MB991958 is as shown in the figure.

Q: Does scan tool MB991958 screen correspond to the illustration?

YES : Repair the wiring harness between joint connector (CAN1) C-103 and KOS-ECU connector C-102.

NO : Check KOS-ECU connector C-102, and repair if necessary. If the KOS-ECU connector is in good condition, replace the KOS-ECU.

STEP 46. Using scan tool MB991958, diagnose the CAN bus line. (checking the WCM for internal failure)

CAUTION Strictly observe the specified wiring harness repair procedure.

CAUTION To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

(1) Disconnect WCM connector C-29.

(2) Connect scan tool MB991958 to the data link connector.

(3) Turn the ignition switch to the "ON" position.

(4) Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the figure.

OK: The display of the scan tool MB991958 is as shown in the figure.

Q: Does scan tool MB991958 screen correspond to the illustration?

YES : Repair the wiring harness between joint connector (CAN1) C-103 and WCM connector C-29.

NO : Check WCM connector C-29, and repair if necessary.

If the WCM connector is in good condition, replace the WCM.

STEP 47. Using scan tool MB991958, diagnose the CAN bus line. (checking the SRS-ECU for internal failure)

CAUTION Strictly observe the specified wiring harness repair procedure.

CAUTION To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

(1) Disconnect SRS-ECU connector C-28.

(2) Connect scan tool MB991958 to the data link connector.

(3) Turn the ignition switch to the "ON" position.

(4) Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the figure.

OK: The display of the scan tool MB991958 is as shown in the figure.

Q: Does scan tool MB991958 screen correspond to the illustration?

YES : Repair the wiring harness between joint connector (CAN1) C-103 and SRS-ECU connector C-28.

NO : Check SRS-ECU connector C-28, and repair if necessary. If the SRS-ECU connector is in good condition, replace the SRS-ECU.

STEP 48. Using scan tool MB991958, diagnose the CAN bus line. (checking the occupant classification-ECU for internal failure)

CAUTION Strictly observe the specified wiring harness repair procedure.

CAUTION To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

(1) Disconnect occupant classification-ECU connector D-34-2.

(2) Connect scan tool MB991958 to the data link connector.

(3) Turn the ignition switch to the "ON" position.

(4) Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the figure.

OK: The display of the scan tool MB991958 is as shown in the figure.

Q: Does scan tool MB991958 screen correspond to the illustration?

YES : Check intermediate connectors C-31 and D-34, and repair if necessary. If the intermediate connector is in good condition, repair the wiring harness between joint connector (CAN1) C-103 and occupant classification-ECU connector D-34-2.

NO : Check occupant classification-ECU connector D-34-2, and repair if necessary. If the occupant classification-ECU connector is in good condition, replace the occupant classification-ECU.

STEP 49. Using scan tool MB991958, diagnose the CAN bus line. (checking the A/C-ECU for internal failure)

CAUTION Strictly observe the specified wiring harness repair procedure.

CAUTION To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

(1) Disconnect A/C-ECU connector C-109.

(2) Connect scan tool MB991958 to the data link connector.

(3) Turn the ignition switch to the "ON" position.

(4) Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the figure.

OK: The display of the scan tool MB991958 is as shown in the figure.

Q: Does scan tool MB991958 screen correspond to the illustration?

YES : Repair the wiring harness between joint connector (CAN1) C-103 and A/C-ECU connector C-109.

NO : Check A/C-ECU connector C-109, and repair if necessary. If the A/C-ECU connector is in good condition, replace the A/C-ECU.

STEP 50. Using scan tool MB991958, diagnose the CAN bus line. (checking the radio and CD player or radio and CD changer for internal failure).

CAUTION Strictly observe the specified wiring harness repair procedure.

CAUTION To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

(1) Disconnect radio and CD player or CD changer connector C-16.

(2) Connect scan tool MB991958 to the data link connector.

(3) Turn the ignition switch to the "ON" position.

(4) Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the figure.

OK: The display of the scan tool MB991958 is as shown in the figure.

Q: Does scan tool MB991958 screen correspond to the illustration?

YES : Repair the wiring harness between joint connector (CAN1) C-103 and radio and CD player or radio and CD changer connector C-16.

NO : Check radio and CD player or radio and CD changer connector C-16, and repair if necessary. If the radio and CD player or radio and CD changer connector is in good condition, replace the radio and CD player or radio and CD changer.

STEP 51. Using scan tool MB991958, diagnose the CAN bus line. (checking the CAN box unit for internal failure)

CAUTION Strictly observe the specified wiring harness repair procedure.

CAUTION To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

(1) Disconnect CAN box unit connector C-13.

(2) Connect scan tool MB991958 to the data link connector.

(3) Turn the ignition switch to the "ON" position.

(4) Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the figure.

OK: The display of the scan tool MB991958 is as shown in the figure.

Q: Does scan tool MB991958 screen correspond to the illustration?

YES : Check intermediate connector C-17, and repair if necessary. If the intermediate connector is in good condition, repair the wiring harness between joint connector (CAN1) C-103 and CAN box unit connector C-13.

NO : Check CAN box unit connector C-13, and repair if necessary. If the CAN box unit connector is in good condition, replace the CAN box unit.

STEP 52. Using scan tool MB991958, diagnose the CAN bus line. (checking the satellite radio tuner for internal failure)

CAUTION Strictly observe the specified wiring harness repair procedure.

CAUTION To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

(1) Disconnect satellite radio tuner connector C-111.

(2) Connect scan tool MB991958 to the data link connector.

(3) Turn the ignition switch to the "ON" position.

(4) Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the figure.

OK: The display of the scan tool MB991958 is as shown in the figure.

Q: Does scan tool MB991958 screen correspond to the illustration?

YES : Repair the wiring harness between joint connector (CAN1) C-103 and satellite radio tuner connector C-111.

NO : Check satellite radio tuner connector C-111, and repair if necessary. If the satellite radio tuner connector is in good condition, replace the satellite radio tuner.

STEP 53. Using scan tool MB991958, diagnose the CAN bus line. (trouble symptom check)

CAUTION Strictly observe the specified wiring harness repair procedure.

CAUTION To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

(1) Connect scan tool MB991958 to the data link connector.

(2) Turn the ignition switch to the "ON" position.

(3) Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the figure.

OK: The display of the scan tool MB991958 is as shown in the figure.

Q: Does scan tool MB991958 screen correspond to the illustration?

YES : The trouble can be an intermittent malfunction.

NO : Check the ETACS-ECU connector C-301, and repair if necessary. If the ETACS-ECU connector is in good condition, replace the ETACS-ECU.

CAN COMMUNICATION-RELATED DTC (U-CODE) TABLE

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