Part 1 of 5
Headlight and Taillight: Any of the taillights, the position lights or the license plate lights do not illuminate.Taillights, Position Lights, Side Marker Lights And License Plate Lights Circuit Part 1:
Taillights, Position Lights, Side Marker Lights And License Plate Lights Circuit Part 2:
TECHNICAL DESCRIPTION (COMMENT)
If the position lights, the taillights or the license plate lights do not illuminate, their bulb may be defective.
TROUBLESHOOTING HINTS
- The position light bulb may be defective
- The stop/taillight bulb may be defective
- The license plate 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
- MB992006: Extra Fine Probe
STEP 1. Verify the operation of each light.
Q: Which light does not illuminate?
The position light (LH), the taillight (LH), the license plate lights and the rear side marker lights : Go to Step 2.
The taillight (LH), the license plate lights and the rear side marker lights : Go to Step 3. The position light (RH) and the taillights (RH): Go to Step 4.
The license plate lights and the rear side marker lights : Go to Step 5.
The position light (LH): Go to Step 8.
The position light (RH) : Go to Step 14.
The taillight (LH): Go to Step 20.
The taillight (RH): Go to Step 23.
The license plate light (LH): Go to Step 28.
The license plate light (RH): Go to Step 33.
The rear side marker light (LH): Go to Step 38.
The rear side marker light (RH): Go to Step 43.
All lights : Refer to Inspection Procedure J-1 "The taillights do not illuminate normally."
STEP 2. Check the wiring harness between front combination light assembly (LH) connector A-31 (terminal 3)
Q: Is the wiring harness between front combination light assembly (LH) connector A-31 (terminal 3)
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 taillight (LH), the position light (LH), the license plate lights and the rear side marker lights should illuminate normally.
STEP 3. Check the wiring harness between front-ECU connector A-1 OX (terminal 8) and rear combination light assembly (LH) connector F-14 (terminal 3).
NOTE: Also check junction block connectors C-210, C-217 and intermediate connector C-129 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If junction block connector C-210, C-217 or intermediate connector C-129 is damaged, repair or replace the damaged components) as described in Harness Connector Inspection.
Q: Is the wiring harness between front-ECU connector A-10X (terminal 8) and rear combination light assembly (LH) connector F-14 (terminal 3) 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 taillight (LH), the license plate lights and the rear side marker lights should illuminate normally.
STEP 4. Check the wiring harness between front combination light assembly (RH) connector A-39 (terminal 3)
Q: Is the wiring harness between front combination light assembly (RH) connector A-39 (terminal 3)
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 position light (RH) and the taillight (RH) illuminate normally.
STEP 5. Check the ground circuit to the license plate light (LH). Measure the resistance at rear side marker light (LH) connector F-20.
1. Disconnect rear side marker light (LH) connector F-20 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 7.
NO: Go to Step 6.
STEP 6. Check the wiring harness between rear side marker light (LH) connector F-20 (terminal 1) and ground.
NOTE: Also check intermediate connector F-12 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector F-12 is damaged, repair or replace the damaged components) as described in Harness Connector Inspection.
Q: Is the wiring harness between rear side marker light (LH) connector F-20 (terminal 1) and ground 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 license plate lights and rear side marker lights illuminates normally.
STEP 7. Check the wiring harness between license plate light (LH) connector F-11 (terminal 2) and junction block connector C-217 (terminal 2).
NOTE: Also check intermediate connector F-12 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector F-12 is damaged, repair or replace the damaged components) as described in Harness Connector Inspection.
Q: Is the wiring harness between license plate light (LH) connector F-11 (terminal 2) and junction block connector C-217 (terminal 2) 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 license plate lights and rear side marker lights illuminate normally.
STEP 8. Check front combination light assembly (LH) connector A-31
Q: Is front combination light assembly (LH) connector A-31
YES: Go to Step 9.
NO: Repair or replace the damaged components). Refer to Harness Connector Inspection. Verify that the position light (LH) illuminates normally.
STEP 9. Check the position light bulb (LH).
1. Remove the position light bulb (LH).
2. Verify that the position light bulb (LH) is not damaged or burned out.
Q: Is the position light bulb (LH) in good condition?
YES: Go to Step 10.
NO: Replace the position light bulb (LH). Verify that the position light (LH) illuminates normally.
STEP 10. Check the ground circuit to the position light (LH). Measure the resistance at front combination light assembly (LH) connector A-31
1. Disconnect front combination light assembly (LH) connector A-31
2. Measure the resistance value between terminal 7
- The resistance should equal 2 ohms or less.
3. Measure the resistance value between terminal 3
- The resistance should equal 2 ohms or less.
Q: Is the measured resistance 2 ohms or less?
YES: Go to Step 12.
NO: Go to Step 11.