Diagnosis Procedure

DOOR LOCK AND UNLOCK SWITCH


KING CAB : Description

Transmits door lock/unlock operation to BCM.





DOOR LOCK AND UNLOCK SWITCH


KING CAB : Diagnosis Procedure

1.CHECK DOOR LOCK/UNLOCK SWITCH INPUT SIGNAL
With CONSULT-III
Check door lock/unlock switch ("CDL LOCK SW", "CDL UNLOCK SW") in DATA MONITOR mode in CONSULT�III. Refer to Door Lock.
- When door lock/unlock switch is turned to LOCK:

CDL LOCK SW :ON

- When door lock/unlock switch is turned to UNLOCK:

CDL UNLOCK SW :ON

Without CONSULT-III
1. Remove key from ignition key cylinder.
2. Check the signal between BCM connector M18 terminal 22 and ground with oscilloscope when door lock/unlock switch is turned to LOCK or UNLOCK.
3. Make sure the signals which are shown in the figure below can be detected during 10 seconds just after the door lock/unlock switch is turned to LOCK or UNLOCK.










Is the inspection result normal?
YES - Door lock and unlock switch circuit is OK.
NO - GO TO 2
2.CHECK BCM OUTPUT SIGNAL
1. Turn ignition switch OFF.
2. Using the vehicle operational key fob, press and hold the UNLOCK button for more than 3 seconds.

The front windows should be lowered?

Is the inspection result normal?
YES - GO TO 3
NO - Replace BCM. Refer to Service and Repair.
3.CHECK DOOR LOCK/UNLOCK SWITCH GROUND HARNESS
1. Disconnect main power window and door lock/unlock switch or power window and door lock/unlock switch RH.





2. Check continuity between main power window and door lock/unlock switch connector D15 terminal 15 and ground.

15 - Ground : Continuity should exist






3. Check continuity between power window and door lock/unlock switch RH connector D105 terminal 11 and ground.

11 - Ground : Continuity should exist

Is the inspection result normal?
YES - GO TO 4
NO - Repair or replace harness.
4.CHECK POWER WINDOW SERIAL LINK CIRCUIT
1. Disconnect BCM.





2. Check continuity between BCM connector M18 terminal 22 and main power window and door lock/unlock switch connector D15 terminal 12.

22 - 12 : Continuity should exist






3. Check continuity between BCM connector M18 terminal 22 and power window and door lock/unlock switch RH connector D105 terminal 16.

22 - 16 : Continuity should exist






4. Check continuity between BCM connector M18 terminal 22 and ground.

22 - Ground : Continuity should not exist

Is the inspection result normal?
YES - Replace main power window and door lock/unlock switch or power window and door lock/unlock switch RH.
NO - Repair or replace harness.