Inspection Procedure 2

Inspection Procedure 2: One of the taillights does not illuminate.














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.

Check the ground line for open circuit.

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).

Check the communication line for open or short circuit.

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 How to Cope With Intermittent Malfunctions).
NO Replace the rear combination light unit.