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Home >> Mitsubishi >> 2011 >> Lancer Sportback L4-2.0L Turbo (4B11T) >> Repair and Diagnosis >> Lighting and Horns >> Dome Lamp >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Inspection Procedure 3

Inspection Procedure 3




Inspection Procedure 3: The luggage compartment 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.

[LANCER]





[LANCER SPORTBACK]





















TROUBLE JUDGMENT

The ETACS-ECU illuminates and extinguishes the luggage compartment light in accordance with the input signals from trunk lid latch switch [LANCER] or liftgate switch [LANCER SPORTBACK].

TECHNICAL DESCRIPTION (COMMENT)

If this does not work normally, the trunk lid latch switch input circuit [LANCER] or liftgate switch input circuit [LANCER SPORTBACK], luggage compartment light, or ETACS-ECU may have a problem.

TROUBLESHOOTING HINTS

- Malfunction of trunk lid latch assembly [LANCER]
- Malfunction of liftgate switch assembly [LANCER SPORTBACK]
- Malfunction of luggage compartment 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 A (Vehicles with CAN communication system)

STEP 1. Using scan tool MB991958, read the diagnostic trouble code.





(1)
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.

Connect scan tool MB991958. Refer to "How to connect scan too (M.U.T.-III) Reading and Clearing Diagnostic Trouble Codes."
(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 Electronic Time and Alarm Control System (ETACS).

NO [LANCER] : Go to Step 2.

NO [LANCER SPORTBACK] : Go to Step 8.

STEP 2. Using scan tool MB991958, check data list.

Use the ETACS-ECU service data to check the signal related to the operation of luggage compartment light.

- Open the trunk lid.





Q. Does scan tool MB991958 display the item "Trunk/gate trunk ajar switch" as normal condition?

YES : (Normal condition is displayed.) Go to Step 3.
NO : (Normal condition is not displayed.) Troubleshoot the ETACS-ECU. Refer to ETACS, Diagnosis, Input signal chart Symptom Chart.
STEP 3. Check luggage compartment light connector F-01 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Is luggage compartment light connector F-01 in good condition?

YES Go to Step 4.
NO Repair or replace the damaged component(s). Harness Connector Inspection.
STEP 4. Luggage compartment light bulb check

Check that the luggage compartment light bulb is normal.

Q. Is luggage compartment light bulb normal?

YES Go to Step 5.
NO Replace the luggage compartment light bulb.
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 connectors C-311 in good condition?

YES Go to Step 6.
NO Repair or replace the damaged component(s). Harness Connector Inspection.
STEP 6. Check the wiring harness between luggage compartment light connector F-01 (terminal 1, 2) and ETACS-ECU connector C-311 (terminal 17, 3).

- Check the signal line for open circuit and short circuit.

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 as described in Harness Connector Inspection Harness Connector Inspection.

Q. Is wiring harness between luggage compartment light connector F-01 (terminal 1, 2) and ETACS-ECU connector C-311 (terminal 17, 3) in good condition?

YES Go to Step 7.
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. Retest the system

Check that the luggage compartment light illuminates and extinguishes normally.

Q. Do the trunk room work normal?

YES The trouble can be an intermittent malfunction How to Cope With Intermittent Malfunctions).
NO Replace the ETACS-ECU.
STEP 8. Check whether the luggage compartment light illuminates.

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

Q. Does the luggage compartment light illuminate?

The light does not illuminate at the "DOOR" position. : Go to Step 9.
The light does not illuminate at the "ON" position. : Go to Step 12.
The light illuminates at neither the "DOOR" nor "ON" position. : Got to Step 14.
STEP 9. Using scan tool MB991958, check data list.

Use the ETACS-ECU service data to check the signal related to the operation of luggage compartment light.

- Open the liftgate.





Q. Does scan tool MB991958 display the item "Trunk/gate trunk ajar switch" as normal condition?

YES : (Normal condition is displayed.) Go to Step 10.
NO : (Normal condition is not displayed.) Troubleshoot the ETACS-ECU. Refer to ETACS, Diagnosis, Input signal chart Symptom Chart.
STEP 10. Check luggage compartment light connector F-01 and ETACS-ECU connector C-311 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Is luggage compartment light connector F-01 or ETACS-ECU connector C-311 in good condition?

YES Go to Step 11.
NO Repair or replace the damaged component(s). Harness Connector Inspection.
STEP 11. Check the wiring harness between luggage compartment light connector F-01 (terminal 1) and ETACS-ECU connector C-311 (terminal 3).

Check the output lines for open circuit and short circuit.

NOTE:
Also check intermediate connector D-11 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector D-11 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection.

Q. Is wiring harness between luggage compartment light connector F-01 (terminal 1) and ETACS-ECU connector C-311 (terminal 3) in good condition?

YES Go to Step 17.
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. Check luggage compartment light connector F-01 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Is luggage compartment light connector F-01 in good condition?

YES Go to Step 13.
NO Repair or replace the damaged component(s). Harness Connector Inspection.
STEP 13. Check the wiring harness between luggage compartment light connector F-01 (terminal 2) and body ground.

Check the ground lines for open circuit.

Q. Is wiring harness between luggage compartment light connector F-01 (terminal 2) and body ground in good condition?

YES Go to Step 18.
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 14. Luggage compartment light bulb check

Check that the luggage compartment light bulb is normal.

Q. Is luggage compartment light bulb normal?

YES Go to Step 15.
NO Replace the luggage compartment light bulb.
STEP 15. Check luggage compartment light connector F-01 and ETACS-ECU connector C-311 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Is luggage compartment light connector F-01 or ETACS-ECU connector C-311 in good condition?

YES Go to Step 16.
NO Repair or replace the damaged component(s). Harness Connector Inspection.
STEP 16. Check the wiring harness between luggage compartment light connector F-01 (terminal 3) and ETACS-ECU connector C-311 (terminal 17).

Check the input lines for open circuit and short circuit.

NOTE:
Also check intermediate connector D-11 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector D-11 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection.

Q. Is wiring harness between luggage compartment light connector F-01 (terminal 3) and ETACS-ECU connector C-311 (terminal 17) in good condition?

YES Go to Step 18.
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 17. Retest the system

Check that the luggage compartment light illuminates and extinguishes normally.

Q. Does the luggage compartment light illuminate?

YES The trouble can be an intermittent malfunction How to Cope With Intermittent Malfunctions).
NO Replace the ETACS-ECU.
STEP 18. Retest the system

Check that the luggage compartment light illuminates and extinguishes normally.

Q. Does the luggage compartment light illuminate?

YES The trouble can be an intermittent malfunction How to Cope With Intermittent Malfunctions).
NO Replace the luggage compartment light.
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