Door & Lock

KEY CYLINDER SWITCH

DRIVER SIDE : Description

The main power window and door lock/unlock switch detects condition of the door key cylinder switch and transmits to BCM as the LOCK or UNLOCK signal.


DRIVER SIDE : Component Function Check


1. CHECK DOOR KEY CYLINDER SWITCH INPUT SIGNAL

Check "KEY CYL LK-SW" AND "KEY CYL UN-SW" in Data Monitor mode for "DOOR LOCK" with CONSULT.





Is the inspection result normal?
YES- Key cylinder switch is OK.
NO- .


DRIVER SIDE : Diagnosis Procedure

Regarding Wiring Diagram information, Wiring Diagram - King Cab or Wiring Diagram - Crew Cab.

1. CHECK DOOR KEY CYLINDER SWITCH LH

With CONSULT
Check front door lock assembly LH (key cylinder switch) ("KEY CYL LK-SW") and ("KEY CYL UN-SW) in
DATA MONITOR mode in CONSULT. CONSULT Function.
- When key inserted in front key cylinder is turned to LOCK:
KEY CYL LK-SW: ON
- When key inserted in front key cylinder is turned to UNLOCK:
KEY CYL UN-SW: ON
Without CONSULT





Check voltage between BCM connector M18 terminals 7, 8 and ground.





Is the inspection result normal?
YES- Front door lock assembly LH (key cylinder switch) signal is OK.
NO- GO TO 2

2. CHECK FRONT DOOR LOCK ASSEMBLY LH (KEY CYLINDER SWITCH)

1.Turn ignition switch OFF.
2.Disconnect front door lock assembly LH (key cylinder switch).





3.Check continuity between front door lock assembly LH (key cylinder switch) connector terminals 3, 4 and 5.





Is the inspection result normal?
YES- GO TO 3
NO- Replace front door lock assembly LH (key cylinder switch). Removal And Installation.

3. CHECK FRONT DOOR LOCK ASSEMBLY LH HARNESS

1.Disconnect BCM.





2.Check continuity between BCM connector M18 terminals 7, 8
and front door lock assembly LH connector D14 terminals 3, 5.
7 - 3: Continuity should exist.
8 - 5: Continuity should exist.

3.Check continuity between BCM connector M18 terminals 7, 8
and ground.
7 - Ground: Continuity should not exist.
8 - Ground: Continuity should not exist.

Is the inspection result normal?
YES- GO TO 4
NO- Repair or replace harness.

4. CHECK FRONT DOOR LOCK ASSEMBLY LH GROUND






Check continuity between front door lock assembly LH connector
D14 terminal 4 and ground.
4 - Ground: Continuity should exist.
Is the inspection result normal?
YES- GO TO 5
NO- Repair or replace harness.

5. CHECK BCM OUTPUT VOLTAGE

1.Connect BCM.





2.Check voltage between BCM connector M18 terminals 7, 8 and ground.
7 - Ground: Approx. 5V
8 - Ground: Approx. 5V

Is the inspection result normal?
YES- Check condition of the harness and connector.
NO- Replace BCM. Service and Repair.