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 front door lock assembly LH.

When the driver's door key cylinder is turned to lock all the doors by key, there is continuity between terminals L and E of the key lock and unlock switch. When the cylinder is turned to unlock the door(s), there is continuity between terminals UL and E.

Terminals KL and KUL of the multiplex network master switch assembly are connected to the front door lock assembly LH, and door lock/unlock request signals (by key) are received by the multiplex network master switch assembly.

The multiplex network master switch assembly constantly applies voltage to terminal L of the front door lock assembly LH via terminal KL. When the driver's door key cylinder is turned to lock all the doors by key, current flows from terminal KL to terminal L. The multiplex network master switch assembly determines that this is door lock request signal and sends a door lock signal to the main body ECU RH using multiplex communication.

The multiplex network master switch assembly also applies constant voltage to terminal UL of the front door lock assembly LH via terminal KUL. When the door key cylinder is turned in the direction to unlock the door(s) by key, current flows from terminal KUL to terminal UL. The multiplex network master switch assembly determines that this is door unlock request signal and sends a door unlock signal to the main body ECU RH using multiplex communication.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING DATA LIST

(a) Check the Data List to ensure proper function of the door unlock detection switch.

Master SW (Multiplex Network Master Switch Assembly):

Master SW (Multiplex Network Master Switch Assembly)::

OK:

The display is as specified in the normal condition column.

NG -- INSPECT FRONT DOOR LOCK ASSEMBLY LH (DOOR KEY LOCK AND UNLOCK SWITCH)

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

2. INSPECT FRONT DOOR LOCK ASSEMBLY LH (DOOR KEY LOCK AND UNLOCK SWITCH)

(a) Remove the front door lock assembly LH.





(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- REPLACE FRONT DOOR LOCK ASSEMBLY LH
OK -- Continue to next step.

3. CHECK WIRE HARNESS (FRONT DOOR LOCK ASSEMBLY - MULTIPLEX NETWORK MASTER SWITCH)

(a) Disconnect the front door lock assembly LH connector.





(b) Disconnect the multiplex network master switch assembly connector.

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

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY