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Home >> Mitsubishi >> 2008 >> Lancer Evolution L4-2.0L Turbo (4B11T/C) >> Repair and Diagnosis >> Body and Frame >> Locks >> Keyless Entry >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Symptom Diagnostic Procedures >> Inspection Procedure 13

Inspection Procedure 13

Inspection Procedure 13: Trunk lid opener switch does not work.

CAUTION: Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.

Trunk Lid Opener Switch Circuit (Part 1):




Trunk Lid Opener Switch Circuit (Part 2):






TROUBLESHOOTING HINTS
- Malfunction of the exterior transmitter antenna assembly (trunk lid)
- Malfunction of the trunk lid opener switch
- Damaged wiring harness and connectors
- Malfunction of the KOS-ECU

DIAGNOSIS

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

STEP 1. 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 tool (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 KOS-ECU related DTC is set.
4. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the DTC set?

YES: Diagnose the KOS-ECU. Refer to Diagnostic Trouble Code Chart. Diagnostic Trouble Code Descriptions

NO: Go to Step 2.

STEP 2. Check KOS-ECU connector C-05 and trunk lid opener switch connector F-09 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are KOS-ECU connector C-05 and trunk lid opener switch connector F-09 in good condition?

YES: Go to Step 3.

NO: Repair or replace the damaged component(s). Refer to general (Electrical), Harness Connector Inspection. Check that the trunk lid opener switch works normally.

STEP 3. Check the trunk lid opener switch.

1. Remove the trunk lid opener switch. Refer to Body, Trunk Lid.




2. Check continuity when the trunk lid opener switch is operated to "ON" or "OFF" position.






Q: Is the trunk lid opener switch normal?

YES: Go to Step 4.

NO: Replace the trunk lid opener switch.

STEP 4. Check the wiring harness between the KOS-ECU connector C-05 (terminal No. 28) and trunk lid opener switch connector F-09 (terminal No. 1), and between trunk lid opener switch connector F-09 (terminal No. 2) and ground for open circuit.

1. Disconnect KOS-ECU connector C-05 and trunk lid opener switch connector F-09, and check the wiring harness.




2. Check the wiring harness between KOS-ECU connector C-05 (terminal No.28) and trunk lid opener switch connector F-09 (terminal No.1).

OK: Continuity exists (2 Ohms or less)




3. Check the wiring harness between trunk lid opener switch connector F-09 (terminal No.2) and ground.

OK: Continuity exists (2 Ohms or less)

Q: Is the wiring harness between KOS-ECU connector C-05 (terminal No. 28) and trunk lid opener switch connector F-09 (terminal No. 1), and between trunk lid opener switch connector F-09 (terminal No. 2) and ground in good condition?

YES: Go to Step 5.

NO (KOS-ECU connector C-05 terminal No.28 - trunk lid opener switch connector F-09 terminal No.1.) : Repair the wiring harness between KOS-ECU connector C-05 (terminal No.28) and trunk lid opener switch connector F-09 (terminal No.1).

NO (trunk lid opener switch connector F-09 terminal No.2 - ground.) : Repair the wiring harness between trunk lid opener switch connector F-09 (terminal No.2) and ground.

STEP 5. Check the wiring harness between the trunk lid opener switch connector F-09 (terminal Nos. 1, 2) and the ground for short circuit.

1. Disconnect trunk lid opener switch connector F-09, and check the wiring harness.




2. Check the wiring harness between trunk lid opener switch connector F-09 (terminal No. 1) and ground

OK: No continuity




3. Check the wiring harness between trunk lid opener switch connector F-09 (terminal No. 2) and ground

OK: No continuity

Q: Is the wiring harness between trunk lid opener switch connector F-09 (terminal Nos. 1, 2) and the ground in good condition?

YES: Go to Step 6.

NO (trunk lid opener switch connector F-09 terminal No.1 - ground.) : Repair the wiring harness between trunk lid opener switch connector F-09 (terminal No.1) and ground.

NO (trunk lid opener switch connector F-09 terminal No.2 - ground.) : Repair the wiring harness between trunk lid opener switch connector F-09 (terminal No.2) and the ground.

STEP 6. KOS communication test

Using scan tool (M.U.T.-III), perform the antenna communication test to check that the exterior transmitter antenna (trunk lid side) is normal (Refer to ID Codes Registration Procedures)

Q: Is the check result normal?

YES: Go to Step 7.

NO: Perform troubleshooting for the diagnostic trouble code No. B240C. B240C

STEP 7. Check of the troubles

Operate the trunk lid opener switch to check that the trunk lid can be opened.

Q: Is the check result normal?

YES: The diagnosis is complete.

NO: Replace KOS-ECU and register the ID codes (Refer to ID Code Registration Necessity Judgment Table).
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