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 Front door key lock and unlock switch LH is built into the Front door lock motor LH. When the Front door key cylinder LH is turned to lock all the doors using the key, there is continuity between terminals L and E of 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 of the main body ECU are connected to the door lock motor, 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 of the front door lock motor LH via terminal L2. When the front door key cylinder LH 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 motor 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) Check the Data List to ensure proper functioning of the door key lock and unlock switch.
Main Body
OK:
The display is as specified in the normal condition column.
NG -- INSPECT FRONT DOOR LOCK MOTOR ASSEMBLY LH (DOOR KEY LOCK AND UNLOCK SWITCH)
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
2. INSPECT FRONT DOOR LOCK MOTOR ASSEMBLY LH (DOOR KEY LOCK AND UNLOCK SWITCH)
(a) Remove the front door lock motor LH (Removal).
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPLACE FRONT DOOR LOCK MOTOR ASSEMBLY LH
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (FRONT DOOR LOCK MOTOR LH - MAIN BODY ECU)
(a) Disconnect the N4 door lock connector.
(b) Disconnect the DD and J4 ECU connectors.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MAIN BODY ECU