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Home >> Mitsubishi >> 2010 >> Lancer Sportback Ralliart L4-2.0L Turbo (4B11T) >> Repair and Diagnosis >> Lighting and Horns >> Tail Lamp >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Symptom Procedures >> Inspection Procedure 2

Inspection Procedure 2

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


Taillight Circuit (Part 1):




Taillight Circuit (Part 2):






TECHNICAL DESCRIPTION (COMMENT)

If 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 (Vehicles with CAN communication system)

STEP 1. Check rear combination light connector F-20 (taillight: LH) or F-06 (taillight: RH), rear side marker light connector F-40 (LH) or F-35 (RH) for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is rear combination light connector F-20 (taillight: LH) or F-06 (taillight: RH), rear side marker light connector F-40 (LH) or F-35 (RH) in good condition?

YES : Go to Step 2.

NO : Repair or replace the damaged component(s).

STEP 2. Bulb check.

Check the bulb(s) of the light that does not illuminate.

Q: Is the check result normal?

YES : Go to Step 3.

NO : Replace the bulb(s) of the light that does not illuminate.

STEP 3. Resistance measurement at rear combination light connector F-20 (taillight: LH) or F-06 (taillight: RH), rear side marker light connector F-40 (LH) or F-35 (RH)).

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 the body ground.







- Measure the resistance between rear combination light connector F-20 (taillight: LH) or F-06 (taillight: RH) (terminal 3) and body ground.







- Measure the resistance between rear side marker light connector F-40 (LH) or F-35 (RH) (terminal 1) and body ground.

OK: 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 5.

NO : Go to Step 4.

STEP 4. Check the wiring harness between rear combination light connector or rear side marker light connector and the body ground.

Check the ground line for open circuit.
- Check the wiring harness between rear combination light connector F-20 (taillight: LH) (terminal 3) and the body ground.
- Check the wiring harness between rear combination light connector F-06 (taillight: RH) (terminal 3) and the body ground.
- Check the wiring harness between rear side marker light connector F-40 (LH) (terminal 1) and the body ground.
- Check the wiring harness between rear side marker light connector F-35 (RH) (terminal 1) and the body ground.

Q: Is the wiring harness between rear combination light connector or rear side marker light connector and the body ground in good condition?

YES : Go to Step 7.

NO : Repair the wiring harness.

STEP 5. Check ETACS-ECU connector C-311 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

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

YES : Go to Step 6.

NO : Repair the damaged parts.

STEP 6. Check wiring harness between rear combination light connector or rear side marker light connector and ETACS-ECU connector.

Check the power supply line for open circuit or short circuit.
- Check the wiring harness between rear combination light (taillight: LH) connector F-20 (terminal 2) and ETACS-ECU connector C-311 (terminal 10).

NOTE: Also check intermediate connectors D-14 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector D-14 is damaged, repair or replace the connector.

- Check the wiring harness between rear combination light (taillight: RH) connector F-06 (terminal 2) and ETACS-ECU connector C-311 (terminal 13).

NOTE: Also check joint connector C-38 and intermediate connector D-11 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connector C-38 or intermediate connector D-11 is damaged, repair or replace the connector.

- Check the wiring harness between rear side marker light (LH) connector F-40 (terminal 2) and ETACS-ECU connector C-311 (terminal 10).

NOTE: Also check intermediate connector D-14 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector D-14 is damaged, repair or replace the connector.

- Check the wiring harness between rear side marker light (RH) connector F-35 (terminal 2) and ETACS-ECU connector C-311 (terminal 13).

NOTE: Also check intermediate connector D-11 and joint connector C-38 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector D-11 or joint connector C-38 is damaged, repair or replace the connector.

Q: Is the wiring harness between rear combination light connector or rear side marker light connector and ETACS-ECU connector in good condition?

YES : Go to Step 7.

NO : Repair the wiring harness.

STEP 7. Retest the system.

Check that the taillight or rear side marker light illuminate normally.

Q: Do the taillight or rear side marker light work normally?

YES (The light illuminate normally.): The trouble can be an intermittent malfunction.

NO [When the rear combination light (taillight) do not illuminate] : Replace the rear combination light socket.

NO [When the rear side marker light do not illuminate] : Replace the rear side marker light socket.
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