Part 1 of 2

Flasher Timer: The right or left turn-signal light does not illuminate.

Turn-signal Light Circuit Part 1:

Turn-signal Light Circuit Part 2:

TECHNICAL DESCRIPTION (COMMENT)
If the right or left turn-signal light does not illuminate, their bulb may be defective.

TROUBLESHOOTING HINTS
- The turn-signal light bulb may be defective
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector

DIAGNOSIS

Required Special Tool:
- MB991223: Harness Set

STEP 1. Check the hazard warning light.

Q: Which turn-signal light does not illuminate?

Front turn-signal light (LH) and side turn-signal light (LH) : Go to Step 2.

Front turn-signal light (RH) and side turn-signal light (RH) : Go to Step 4. front turn-signal light (LH) : Go to Step 6.

front turn-signal light (RH) : Go to Step 12.

side turn-signal light (LH) : Go to Step 18.

side turn-signal light (RH) : Go to Step 24.

rear combination light (LH) : Go to Step 30.

rear combination light (RH) : Go to Step 36.

combination meter (LH) : Go to Step 42.

combination meter (RH) : Go to Step 44.

Combination meter (both right and left) : Go to Step 46

front turn-signal light (RH), side turn-signal light (RH) and rear combination light (RH) : Go to Step 48.

LH side only : Refer to Inspection Procedure L-1 "Turn-signal lights does not flash when the turn-signal light switch is turned on."

RH side only : Refer to Inspection Procedure L-1 "Turn-signal lights does not flash when the turn-signal light switch is turned on."

Both LH and RH sides : Refer to Inspection Procedure L-2 "Hazard warning light does not illuminate."

STEP 2. Check front turn-signal light (LH) connector A-16 and ETACS-ECU connector C-226 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are front turn-signal light (LH) connector A-16 and ETACS-ECU connector C-226 in good condition?

YES: Go to Step 3.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Verify that the turn-signal lights illuminate normally.

STEP 3. Check the wiring harness between front turn-signal light (LH) connector A-16 (terminal 2) and ETACS-ECU connector C-226 (terminal 14).

NOTE: Also check intermediate connector C-129 and junction block connector C-210 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-129 or junction block connector C-210 is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection.

Q: Is the wiring harness between front turn-signal light (LH) connector A-16 (terminal 2) and ETACS-ECU connector C-226 (terminal 14) in good condition?

YES: No action is necessary and testing is complete.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the turn-signal lights illuminate normally.

STEP 4. Check front turn-signal light (RH) connector A-20 and ETACS-ECU connector C-226 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are front turn-signal light (RH) connector A-20 and ETACS-ECU connector C-226 in good condition?

YES: Go to Step 5.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Verify that the turn-signal lights illuminate normally.

STEP 5. Check the wiring harness between front turn-signal light (RH) connector A-20 (terminal 2) and ETACS-ECU connector C-226 (terminal 9).

NOTE: Also check junction block connector C-210 and intermediate connector C-111 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If junction block connector C-210 or intermediate connector C-111 is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection.

Q: Is the wiring harness between front turn-signal light (RH) connector A-20 (terminal 2) and ETACS-ECU connector C-226 (terminal 9) in good condition?

YES: No action is necessary and testing is complete.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the turn-signal lights illuminate normally.

STEP 6. Check front turn-signal light (LH) connector A-16 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is the front turn-signal (LH) connector A-16 in good condition?

YES: Go to Step 7.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Verify that the turn-signal lights illuminate normally.

STEP 7. Check the front turn-signal light bulb (LH).

1. Remove the front turn-signal (LH) light bulb.
2. Verify that the front turn-signal light bulb (LH) is not damaged or burned out.

Q: Is the front turn-signal (LH) light bulb in good condition?

YES: Go to Step 8.

NO: Replace the front turn-signal (LH) light bulb. Verify that the turn-signal lights illuminate normally.

STEP 8. Check the ground circuit to the front turn signal light (LH). Test at front turn-signal light (LH) connector A-16.

1. Disconnect front turn-signal light (LH) connector A-16 and measure the resistance available at the wiring harness side of the connector.

2. Measure the resistance value between terminal 1 and ground.
- The resistance should equal 2 Ohms or less.

Q: Is the measured resistance 2 Ohms or less?

YES: Go to Step 10.

NO: Go to Step 9.

STEP 9. Check the wiring harness between front turn-signal light (LH) connector A-16 (terminal 1) and ground.

Q: Is the wiring harness between front turn-signal light (LH) connector A-16 (terminal 1) and ground in good condition?

YES: Replace the socket. Verify that the turn-signal lights illuminate normally.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the turn-signal lights illuminate normally.

STEP 10. Check ETACS-ECU connector C-226 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Is ETACS-ECU connector C-226 in good condition?

YES: Go to Step 11.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Verify that the turn-signal lights illuminate normally.

STEP 11. Check the wiring harness between front turn-signal light (LH) connector A-16 (terminal 2) and ETACS-ECU connector C-226 (terminal 14).

NOTE: Also check junction block connector C-210 and intermediate connector C-129 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If junction block connector C-210 or intermediate connector C-129 is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection.

Q: Is the wiring harness between front turn-signal light (LH) connector A-16 (terminal 2) and ETACS-ECU connector C-226 (terminal 14) in good condition?

YES: Replace the socket. Verify that the turn-signal lights illuminate normally.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the turn-signal lights illuminate normally.

STEP 12. Check front turn-signal light (RH) connector A-20 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is the front turn-signal (RH) connector A-20 in good condition?

YES: Go to Step 13.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Verify that the turn-signal lights illuminate normally.

STEP 13. Check the front turn-signal light bulb (RH).

1. Remove the front turn-signal (RH) light bulb.
2. Verify that the front turn-signal light bulb (RH) is not damaged or burned out.

Q: Is the front turn-signal (RH) light bulb in good condition?

YES: Go to Step 14.

NO: Replace the front turn-signal (RH) light bulb. Verify that the turn-signal lights illuminate normally.

STEP 14. Check the ground circuit to the front turn-signal light (RH). Test at front turn-signal light (RH) connector A-20.

1. Disconnect front turn-signal light (RH) connector A-20 and measure the resistance available at the wiring harness side of the connector.

STEP 15. Check the wiring harness between front turn-signal light (RH) connector A-20 (terminal 1) and ground.

Q: Is the wiring harness between front turn-signal light (RH) connector A-20 (terminal 1) and ground in good condition?

YES: Replace the socket. Verify that the turn-signal lights illuminate normally.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the turn-signal lights illuminate normally.

STEP 16. Check ETACS-ECU connector C-226 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is ETACS-ECU connector C-226 in good condition?

YES: Go to Step 17.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Verify that the turn-signal lights illuminate normally.

STEP 17. Check the wiring harness between front turn-signal light (RH) connector A-20 (terminal 2) and ETACS-ECU connector C-226 (terminal 9).

NOTE: Also check junction block connector C-210 and intermediate connector C-111 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If junction block connector C-210 or intermediate connector C-111 is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection.

Q: Is the wiring harness between front turn-signal light (RH) connector A-20 (terminal 2) and ETACS-ECU connector C-226 (terminal 9) in good condition?

YES: Replace the socket. Verify that the turn-signal lights illuminate normally.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the turn-signal lights illuminate normally.

STEP 18. Check side turn-signal light (LH) connector A-02 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is the side turn-signal light (LH) connector A-02 in good condition?

YES: Go to Step 19.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Verify that the turn-signal lights illuminate normally.

STEP 19. Check the side turn-signal light bulb (LH).

1. Remove the side turn-signal light (LH) bulb.
2. Verify that the side turn-signal light bulb (LH) is not damaged or burned out.

Q: Is the side turn-signal light (LH) bulb in good condition?

YES: Go to Step 20.

NO: Replace the side turn-signal light (LH) bulb. Verify that the turn-signal lights illuminate normally.

STEP 20. Check the ground circuit to the side turn-signal light (LH). Test at side turn-signal light (LH) connector A-02.

1. Disconnect side turn-signal light (LH) connector A-02 and measure the resistance available at the wiring harness side of the connector.

STEP 21. Check the wiring harness between side turn-signal light (LH) connector A-02 (terminal 1) and ground.

Q: Is the wiring harness between side turn-signal light (LH) connector A-02 (terminal 1) and ground in good condition?

YES: Replace the socket. Verify that the turn-signal lights illuminate normally.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the turn-signal lights illuminate normally.

STEP 22. Check ETACS-ECU connector C-226 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is ETACS-ECU connector C-226 in good condition?

YES: Go to Step 23.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Verify that the turn-signal lights illuminate normally.

STEP 23. Check the wiring harness between side turn-signal light (LH) connector A-02 (terminal 2) and ETACS-ECU connector C-226 (terminal 14).

NOTE: Also check junction block connector C-210 and intermediate connector C-129 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If junction block connector C-210 or intermediate connector C-129 is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection.

Q: Is the wiring harness between side turn-signal light (LH) connector A-02 (terminal 2) and ETACS-ECU connector C-226 (terminal 14) in good condition?

YES: Replace the socket. Verify that the turn-signal lights illuminate normally.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the turn-signal lights illuminate normally.

STEP 24. Check side turn-signal light (RH) connector A-01 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is the side turn-signal light (RH) connector A-01 in good condition?

YES: Go to Step 25.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Verify that the turn-signal lights illuminate normally.

STEP 25. Check the side turn-signal light bulb (RH).

1. Remove the side turn-signal light (RH) bulb.
2. Verify that the side turn-signal light bulb (RH) is not damaged or burned out.

Q: Is the side turn-signal light (RH) bulb in good condition?

YES: Go to Step 26.

NO: Replace the side turn-signal light (RH) bulb. Verify that the turn-signal lights illuminate normally.