Inspection Procedure 9: Driver's door lock/unlock switch does not work Mitsubishi Lancer Evolution X

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

Scheme 47

1. Malfunction of the outside transmission antenna assembly (driver's side)
2. Malfunction of the lock/unlock switch (front door: LH)
3. Damaged wiring harness and connectors
4. Malfunction of the KOS-ECU

Required Special Tools

1. MB992006: Extra fine probe
2. MB991223: Harness set
3. 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

Scheme 48

1. 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. Connect scan tool MB991958. Refer to " HOW TO CONNECT SCAN TOOL (M.U.T.-III) ." Turn the ignition switch to the "ON" position. Check whether the KOS-ECU related DTC is set. 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 . NO: Go to Step 2.
2. STEP 2. Check KOS-ECU connector C-31 and lock/unlock switch (front door: LH) connector E-18 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Q: Are KOS-ECU connector C-31 and lock/unlock switch (front door: LH) connector E-18 in good condition? YES: Go to Step 3. NO: Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . Check that the driver's door lock/unlock switch works normally.
3. STEP 3. Check the lock/unlock switch (front door: LH). Remove the door outside handle base. Refer to DOOR HANDLE AND LATCH . Check continuity when the lock/unlock switch (front door: LH) is operated to "ON" or "OFF" position. SWITCH POSITION SPECIFIED CONDITION CHART Switch position Terminal number Specified condition ON 1 - 2 Continuity exists (2 ohms or less) OFF 1 - 2 Open circuit Q: Is the lock/unlock switch (front door: LH) normal? YES: Go to Step 4. NO: Replace the door outside handle base (front door: LH).
4. STEP 4. Check the wiring harness between KOS-ECU connector C-31 (terminal No. 21) and lock/unlock switch (front door: LH) connector E-18 (terminal No. 1), and between lock/unlock switch (front door: LH) connector E-18 (terminal No. 2) and ground. Check the signal and ground wires for open circuit. NOTE: Also check intermediate connectors C-125, C-126 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connectors C-125, C-126 is damaged, repair or replace the damaged component(s) as described in HARNESS CONNECTOR INSPECTION . Q: Are the wiring harness between KOS-ECU connector C-31 (terminal No. 21) and lock/unlock switch (front door: LH) connector E-18 (terminal No. 1), and between lock/unlock switch (front door: LH) connector E-18 (terminal No. 2) and ground in good condition? YES: Go to Step 5. 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. Check that the driver's door lock/unlock switch works normally.
5. STEP 5. KOS communication test Using scan tool (M.U.T-III), perform the antenna communication test to check that the outside transmission antenna assembly (driver's side) communicates normally (Refer to ID CODES REGISTRATION PROCEDURES ). Q: Is the check result normal? YES: Go to Step 6. NO: Perform troubleshooting for the diagnostic trouble code No. B240A (Refer to DTC B240A: DR SIDE ANTENNA (OUTDOOR) OPEN ).
6. STEP 6. Check of the troubles Operate the lock/unlock 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 CODES REGISTRATION JUDGMENT TABLE ).