Part 1 of 2

Flasher timer: One of the turn-signal lights do not illuminate.

Turn Signal Light Circuit:

Turn Signal Lights Circuit Part 1:

Turn Signal Lights 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. Verify the hazard warning light operation.

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 7.
front turn-signal light (LH): Go to Step 9.
front turn-signal light (RH): Go to Step 15.
side turn-signal light (LH): Go to Step 21.
side turn-signal light (RH): Go to Step 27.
rear combination light (LH): Go to Step 33.
rear combination light (RH): Go to Step 39.
combination meter (LH): Go to Step 45.
combination meter (RH): Go to Step 47.
combination meter (both right and left) : Go to Step 49.
LH side only: Refer to Inspection Procedure K-1 "Turn-signal lights does not flash when the turn-signal light switch is turned on."
RH side only: Refer to Inspection Procedure K-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 K-2 "Hazard warning lights do not flash when the hazard warning light switch is turned on."

STEP 2. Check front combination 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 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 ground circuit to the front combination light (LH). Measure the resistance at front combination light (LH) connector A-16.

1. Disconnect front combination 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 3 and ground.
- The resistance should equal 2 Ohms or less.

Q: Is the measured resistance 2 Ohms or less?

YES: Go to Step 5.

NO: Go to Step 4.

STEP 4. Check the wiring harness between front combination light (LH) connector A-16 (terminal 3) and ground.

Q: Is the wiring harness between front combination light (LH) connector A-16 (terminal 3) 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 5. Check ETACS-ECU connector C-217 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is ETACS-ECU connector C-217 in good condition?

YES: Go to Step 6.

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

STEP 6. Check the wiring harness between front combination light (LH) connector A-16 (terminal 2) and ETACS-ECU connector C-217 (terminal 14).

STEP 7. Check front combination light (RH) connector A-28 and ETACS-ECU connector C-217 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are front combination light (RH) connector A-28 and ETACS-ECU connector C-217 in good condition?

YES: Go to Step 8.

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

STEP 8. Check the wiring harness between front combination light (RH) connector A-28 (terminal 2) and ETACS-ECU connector C-217 (terminal 9).

NOTE: Also check junction block connector C-202 and intermediate connector C-116 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If junction block connector C-202 or intermediate connector C-116 is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection.

Q: Is the wiring harness between front combination light (RH) connector A-28 (terminal 2) and ETACS-ECU connector C-217 (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 9. 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 10.

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

STEP 10. Check front combination 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 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 ground circuit to the front combination light (LH). Measure the resistance at front combination light (LH) connector A-16.

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

STEP 12. Check the wiring harness between front combination light (LH) connector A-16 (terminal 3) and ground.

Q: Is the wiring harness between front combination light (LH) connector A-16 (terminal 3) 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 13. Check ETACS-ECU connector C-217 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is ETACS-ECU connector C-217 in good condition?

YES: Go to Step 14.

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

STEP 14. Check the wiring harness between front combination light (LH) connector A-16 (terminal 2) and ETACS-ECU connector C-217 (terminal 14).

NOTE: Also check junction block connector C-202 and intermediate connector C-116 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If junction block connector C-202 or intermediate connector C-116 is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection.

Q: Is the wiring harness between front combination light (LH) connector A-16 (terminal 2) and ETACS-ECU connector C-217 (terminal 14) in good condition?

YES: Replace the socket. Check 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 15. 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 16.

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

STEP 16. Check front combination light (RH) connector A-28 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is the front turn-signal (RH) connector A-28 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 ground circuit to the front combination light (RH). Measure the resistance at front combination light (RH) connector A-28.

1. Disconnect front combination light (RH) connector A-28 and measure the resistance available at the wiring harness side of the connector.

STEP 18. Check the wiring harness between front combination light (RH) connector A-28 (terminal 3) and ground.

Q: Is the wiring harness between front combination light (RH) connector A-28 (terminal 3) 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 19. Check ETACS-ECU connector C-217 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is ETACS-ECU connector C-217 in good condition?

YES: Go to Step 20.

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

STEP 20. Check the wiring harness between front combination light (RH) connector A-28 (terminal 2) and ETACS-ECU connector C-217 (terminal 9).

NOTE: Also check junction block connector C-202 and intermediate connector C-116 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If junction block connector C-202 or intermediate connector C-116 is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection.

Q: Is the wiring harness between front combination light (RH) connector A-28 (terminal 2) and ETACS-ECU connector C-217 (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 21. 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 22.

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

STEP 22. Check side turn-signal light (LH) connector A-04 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is the side turn-signal light (LH) connector A-04 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 ground circuit to the side turn-signal light (LH). Measure the resistance at side turn-signal light (LH) connector A-04.

1. Disconnect side turn-signal light (LH) connector A-04 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 25.

NO: Go to Step 24.

STEP 24. Check the wiring harness between side turn-signal light (LH) connector A-04 (terminal 1) and ground.

Q: Is the wiring harness between side turn-signal light (LH) connector A-04 (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 25. Check ETACS-ECU connector C-217 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is ETACS-ECU connector C-217 in good condition?

YES: Go to Step 26.

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