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Home >> Mitsubishi >> 2010 >> Lancer Sportback Ralliart L4-2.0L Turbo (4B11T) >> Repair and Diagnosis >> Lighting and Horns >> Dome Lamp >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Symptom Procedures >> Inspection Procedure 1

Inspection Procedure 1

Inspection Procedure 1: The front dome light does not illuminate normally.

CAUTION: Whenever the ECU is replaced, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.


Front Dome Light Circuit (Part 1):




Front Dome Light Circuit (Part 2):






TROUBLE JUDGMENT

The ETACS-ECU illuminates and extinguishes the front room light in accordance with the input signals below.
- Ignition switch (IG1)
- Key reminder switch
- Door switches
- Front door lock actuator

TECHNICAL DESCRIPTION (COMMENT)

If this does not work normally, the above switch input circuit(s), front dome light, or ETACS-ECU may have a problem.

TROUBLESHOOTING HINTS

- Malfunction of the key reminder switch
- Malfunction of door switch
- Malfunction of the front door lock actuator switch
- Malfunction of front dome light
- Malfunction of the ETACS-ECU
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector

DIAGNOSIS

Required Special Tools:
- 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. Rear dome light operation check.

Check that the rear dome light illuminates and extinguishes normally.

Q: Does rear dome light work normally?

YES : Go to Step 2.

NO : Replace the ETACS-ECU.

STEP 2. Using scan tool MB991958, read the diagnostic trouble code.

CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.







1. Connect scan tool MB991958. Refer to "How to connect scan too (M.U.T.-III)." How to Connect the Scan Tool (M.U.T.-III)
2. Turn the ignition switch to the "ON" position.
3. Check whether the ETACS-ECU related DTC is set.
4. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the DTC set?

YES : Diagnose the ETACS-ECU. Refer to ETACS, Diagnosis. Diagnostic Trouble Code Descriptions

NO : Go to Step 3.

STEP 3. Check whether the front dome light illuminates.

When the front dome light switch is turned to the "DOOR" or "ON" position, check that the front dome light illuminates.

Q: Does the front dome light illuminate?

The light does not illuminate at the "DOOR" position. : Go to Step 4.

The light does not illuminate at the "ON" position. : Go to Step 7.

The light illuminates at neither the "DOOR" nor "ON" position. : Got to Step 9.

STEP 4. Using scan tool MB991958, check data list.

Use the ETACS-ECU data list to check the signals related to the front dome light.
- Turn the ignition switch to the "LOCK" (OFF) position.
- Remove the ignition key from the ignition key cylinder.
- Open each door.







Q: Does scan tool MB991958 display the items "Dr door unlock", "IG voltage", "Dr door ajar switch", "As door ajar switch", "RR door ajar switch", "RL door ajar switch" and "Handle lock switch" as normal condition?

YES : (Normal conditions are displayed for all items.) Go to Step 5.

NO : (Normal condition is not displayed.) Troubleshoot the ETACS-ECU. Refer to ETACS, Diagnosis, Input signal chart. Scan Tool Testing and Procedures

STEP 5. Check front dome light connector D-02 and ETACS-ECU connector C-316 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is front dome light connector D-02 or ETACS-ECU connector C-316 in good condition?

YES : Go to Step 6.

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

STEP 6. Check the wiring harness between front dome light connector D-02 (terminal 3) and ETACS-ECU connector C-316 (terminal 5)

Check the output lines for open circuit and short circuit.

Q: Are wiring harness between front dome light connector D-02 (terminal 3) and ETACS-ECU connector C-316 (terminal 5) in good condition?

YES : Go to Step 12.

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.

STEP 7. Check front dome light connector D-02 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is front dome light connector D-02 in good condition?

YES : Go to Step 8.

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

STEP 8. Check the wiring harness between front dome light connector D-02 (terminal 1) and body ground.

Check the ground lines for open circuit.

Q: Are wiring harness between front dome light connector D-02 (terminal 1) and body ground in good condition?

YES : Go to Step 13.

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.

STEP 9. Front dome light bulb check

Check that the front dome light bulb is normal.

Q: Is front dome light bulb normal?

YES : Go to Step 10.

NO : Replace the front dome light bulb.

STEP 10. Check front dome light connector D-02 and ETACS-ECU connector C-316 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is front dome light connector D-02 or ETACS-ECU connector C-316 in good condition?

YES : Go to Step 11.

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

STEP 11. Check the wiring harness between front dome light connector D-02 (terminal 2) and ETACS-ECU connector C-316 (terminal 6)

Check the input lines for open circuit and short circuit.

Q: Are wiring harness between front dome light connector D-02 (terminal 2) and ETACS-ECU connector C-316 (terminal 6) in good condition?

YES : Go to Step 13.

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.

STEP 12. Retest the system

Check that the front dome light illuminates and extinguishes normally.

Q: Do the front dome light work normal?

YES : The trouble can be an intermittent malfunction. (Refer to How to use Troubleshooting/inspection sevice points - How to cope with Intermittent Malfunction).

NO : Replace the ETACS-ECU.

STEP 13. Retest the system

Check that the front dome light illuminates and extinguishes normally.

Q: Do the front dome light work normal?

YES : The trouble can be an intermittent malfunction. (Refer to How to use Troubleshooting/inspection sevice points - How to cope with Intermittent Malfunction).

NO : Replace the front dome light.
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