Door Lock Cylinder Switch: Testing and Inspection

KEY CYLINDER SWITCH

Description

When the mechanical key is inserted and turned into the front door lock key cylinder switch LH, the switch transmits the LOCK or UNLOCK signal directly to the BCM.


Component Function Check


1. CHECK DOOR KEY CYLINDER SWITCH INPUT SIGNAL

Check KEY CYL UN-SW, KEY CYL UN-SW in "DATA MONITOR" mode for "POWER DOOR LOCK SYSTEM"
with CONSULT. Door & Lock.





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


Diagnosis Procedure

Regarding Wiring Diagram information, [1][2]Electrical Diagrams.

1. CHECK DOOR KEY CYLINDER SWITCH INPUT SIGNAL

1.Turn ignition switch ON.
2.Check voltage between BCM connector and ground.





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

2. CHECK DOOR KEY CYLINDER SWITCH GROUND CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect front door lock key cylinder switch LH connector.
3.Check continuity between front door lock key cylinder switch LH connector and ground.





Is the inspection result normal?
YES- GO TO 3
NO- Repair or replace harness.

3. CHECK DOOR KEY CYLINDER SIGNAL CIRCUIT

1.Disconnect BCM connector M18.
2.Check continuity between front door lock key cylinder switch LH connector and BCM connector M18.





3.Check continuity between front door lock key cylinder switch LH connector and ground.





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

4. CHECK DOOR KEY CYLINDER SWITCH

Check door key cylinder switch.
.
Is the inspection result normal?
YES- Check intermittent incident. .
NO- Replace front door lock key cylinder switch LH.


Component Inspection


COMPONENT INSPECTION


1. CHECK DOOR KEY CYLINDER SWITCH

Check front door lock key cylinder switch LH.





Is the inspection result normal?
YES- Key cylinder switch is OK.
NO- Replace front door lock key cylinder switch LH.