Driver Side Door Key Lock and Unlock Switch Circuit

DOOR LOCK: POWER DOOR LOCK CONTROL SYSTEM: Driver Side Door Key Lock and Unlock Switch Circuit

Driver Side Door Key Lock and Unlock Switch Circuit

DESCRIPTION

The driver's door key lock and unlock switch is built into the driver's door lock. When the driver's door key cylinder is turned to lock all the doors using the key, there is continuity between terminals L and E on the key lock and unlock switch. When the cylinder is turned to unlock the doors, there is continuity between terminals UL and E. Terminals L2 and UL3 on the main body ECU are connected to the door lock LH, and door lock/unlock request signals (by key) are input to the main body ECU. The main body ECU constantly applies voltage to terminal L on the driver's door lock LH via terminal L2. When the driver's door key cylinder is turned to lock all the doors using the key, current flows from terminal L2 to terminal L. The main body ECU also applies constant voltage to terminal UL of the door lock LH via terminal UL3. When the door key cylinder is turned to unlock the doors using the key, current flows from terminal UL3 to terminal UL.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM
(a) Connect a Techstream to the DLC3.
(b) Turn the ignition switch ON.
(c) Turn the tester on.
(d) Enter the following menus: Body Electrical / Main Body / Data List.
(e) According to the display on tester, read on the "Data List".

Main Body





OK:
The display is as specified in the normal condition column.
NG -- INSPECT FRONT DOOR LOCK LH (DOOR KEY LOCK AND UNLOCK SWITCH)
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
2. INSPECT FRONT DOOR LOCK LH (DOOR KEY LOCK AND UNLOCK SWITCH)




(a) Remove the front door lock LH Removal.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(c) Reinstall the front door lock LH Installation.
NG -- REPLACE FRONT DOOR LOCK LH
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (FRONT DOOR LOCK MOTOR LH - MAIN BODY ECU AND BODY GROUND)
(a) Disconnect the J4 front door lock LH connector.
(b) Disconnect the F38 and 4H main body ECU (instrument panel junction block) connectors.




(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(d) Reconnect the front door lock LH connector.
(e) Reconnect the main body ECU (instrument panel junction block) connectors.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MAIN BODY ECU