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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 9

Inspection Procedure 9

Inspection Procedure 9: Driver's door lock switch does not work.

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

Lock Switch (Front Door: LH) Circuit:






TROUBLESHOOTING HINTS
- Malfunction of the exterior transmitter antenna assembly (driver's side)
- Malfunction of the lock switch (front door: LH)
- 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 lock switch(front door: LH) connector E-17 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are KOS-ECU connector C-05 and lock switch (frontdoor: LH) connector E-17 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 driver.s door lock switch works normally.

STEP 3. Check the lock switch (front door: LH).

1. Remove the door outside handle base. Refer to Body, Door Handle and Latch.




2. Check continuity when the lock switch (front door: LH) is operated to "ON" or "OFF" position.






Q: Is the lock switch (front door: LH) normal?

YES: Go to Step 4.

NO: Replace the door outside handle base (front door:LH).

STEP 4. Check the wiring harness between the KOS-ECU connector C-05 (terminal No. 21) and lock switch (frontdoor: LH) connector E-17 (terminal No. 1), and between lock switch (front door: LH) connector E-17 (terminal No. 2)and ground for open circuit.

1. Disconnect KOS-ECU connector C-05 and lock switch(front door: LH) connector E-17, and check the wiring harness.




2. Check the wiring harness between KOS-ECU connector C-05 (terminal No.21) and lock switch (front door: LH)connector E-17 (terminal No.1).

OK: Continuity exists (2 Ohms or less)




3. Check the wiring harness between lock switch (front door:LH) connector E-17 (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. 21) and lock switch (front door: LH)connector E-17 (terminal No. 1), and between locks witch (front door: LH) connector E-17 (terminal No. 2)and ground in good condition?

YES: Go to Step 5.

NO (KOS-ECU connector C-05 terminal No.21 - locks witch (front door: LH) connector E-17 terminal No.1.) : Repair the wiring harness between KOS-ECU connector C-05 (terminal No.21) and lock switch(front door: LH) connector E-17 (terminal No.1).

NO (lock switch (front door: LH) connector E-17terminal No.2 - ground.) : Repair the wiring harness between lock switch (front door: LH) connector E-17(terminal No.2) and ground.

STEP 5. Check the wiring harness between the lock switch(front door: LH) connector E-17 (terminal Nos. 1, 2) and the ground for short circuit.

1. Disconnect lock switch (front door: LH) connector E-17, and check the wiring harness.




2. Check the wiring harness between lock switch (front door:LH) connector E-17 (terminal No. 1) and ground

OK: No continuity




3. Check the wiring harness between lock switch (front door:LH) connector E-17 (terminal No. 2) and ground

OK: No continuity

Q: Is the wiring harness between lock switch (front door:LH) connector E-17 (terminal Nos. 1, 2) and the grounding good condition?

YES: Go to Step 6.

NO [lock switch (front door: LH) connector E-17terminal No.1 - ground.] : Repair the wiring harness between lock switch (front door: LH) connector E-17(terminal No.1) and ground.

NO [lock switch (front door: LH) connector E-17terminal No.2 - ground.] : Repair the wiring harness between lock switch (front door: LH) connector E-17(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 (driver's side) communicates normally (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. B240A. B240A

STEP 7. Check of the troubles

Operate the lock switch (front door: LH) and check that the door can be locked.

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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