Inspection Procedure 2

Inspection Procedure 2: One Of The Taillights Does Not Illuminate.

Taillight Circuit (Part 1):

Taillight Circuit (Part 2):

TECHNICAL DESCRIPTION (COMMENT)
When one of the taillights does not illuminate, the wiring harness, connector(s), or rear combination light unit may have a problem, or the fuse may be burned out.

TROUBLESHOOTING HINTS
- Malfunction of rear combination light unit
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

DIAGNOSIS

Required Special Tools:
- MB992006: Extra fine probe
- MB991223: Harness set
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)

STEP 1. Check rear combination light connectors D-09 (RH) and D-14 (LH) for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is rear combination light connectors D-09 (RH) and D-14 (LH) in good condition?

YES : Go to Step 2.

NO : Repair the damaged parts

STEP 2. Resistance measurement at rear combination light connectors D-09 (RH) and D-14 (LH).

1. Disconnect the connector, and measure at the wiring harness side.
2. Measure the resistance between the connector of light which does not illuminate and body ground.




- Measure the resistance between rear combination light connector D-09 (RH) (terminal No. 4) and body ground.




- Measure the resistance between rear combination light connector D-14 (LH) ( terminal No. 4) and body ground.
The measured value should be continuity exists (2 ohms or less).

Q: Does the measured resistance value correspond with this range?

YES : Go to Step 4.

NO : Go to Step 3.

STEP 3. Check the wiring harness between rear combination light connectors D-09 (RH) and D-14 (LH) (terminal No. 4) and ground.

Q: Is the check result normal?

YES : Go to Step 4.

NO : Repair the wiring harness.

STEP 4. Check ETACS-ECU connectors C-311 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is ETACS-ECU connectors C-311 in good condition?

YES : Go to Step 5.

NO : Repair the damaged parts.

STEP 5. Check the wiring harness between rear combination light connector D-09 (RH), D-14 (LH) and ETACS-ECU connector C-311 (terminal No. 13) (RH), (terminal No. 10) (LH).

Q: Is the wiring harness between rear combination light connector D-09 (RH), D-14 (LH) and ETACS-ECU connector C-311 (terminal No. 13) (RH), (terminal No. 10) (LH) in good condition?

YES : Go to Step 6.

NO : Repair the wiring harness.

STEP 6. Retest the system.

Check that the taillight illuminates normally.

Q: Does the taillight work normally?

YES : The trouble can be an intermittent malfunction (Refer to general (body and chassis) - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction).

NO : Replace the rear combination light unit.