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

for Preparation Click here


DESCRIPTION

The driver's door key lock and unlock switch is built into the driver's door lock assembly. When the driver's door key cylinder is turned to lock all the doors by 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 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 door lock assembly, and door lock/unlock request signals (by key) are input to the multiplex network master switch assembly.
The multiplex network master switch assembly constantly applies voltage to terminal L of the driver's door lock assembly 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 input and sends a door lock signal to the body ECU using multiplex communication.
The multiplex network master switch assembly also applies constant voltage to terminal UL of the door lock assembly 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 input and sends a door unlock signal to the body ECU using multiplex communication.

WIRING DIAGRAM


B111721E03


INSPECTION PROCEDURE

1.READ VALUE OF DATA LIST

  1. Check the DATA LIST to ensure proper operation of the door unlock detection switch.

    Multiplex Network Master Switch Assembly 
    Item
    		Measurement Item /
    Display (Range)
    		Normal Condition
    		Diagnostic Note
    Door Key Linked Lock SW
    		Driver door lock/unlock switch lock signal (key-linked-lock switch)
    /ON or OFF
    		ON: Driver side door key cylinder is turned to LOCK
    OFF: Driver side door key cylinder is not turned to LOCK
    		-
    Door Key Linked Unlock SW
    		Driver door lock/unlock switch unlock signal (key-linked-unlock switch)
    /ON or OFF
    		ON: Driver side door key cylinder is turned to UNLOCK
    OFF: Driver side door key cylinder is not turned to UNLOCK
    		-

    OK:
    The display is as specified in the normal condition.



NG
Go to step 2
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

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


  1. LHD Models:


    B112744E01

    Remove the front door lock assembly LH.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    7 - 9
    		ON (Door lock set to LOCK)
    		Below 1 Ω
    7 - 9, 7 - 10
    		OFF (Free)
    		10 kΩ or higher
    7 - 10
    		ON (Door lock set to UNLOCK)
    		Below 1 Ω



    B064720E01

  1. RHD Models:
    Remove the front door lock assembly RH.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    8 - 6
    		ON (Door lock set to LOCK)
    		Below 1 Ω
    8 - 6, 8 - 5
    		OFF (Free)
    		10 kΩ or higher
    8 - 5
    		ON (Door lock set to UNLOCK)
    		Below 1 Ω



NG
REPLACE FRONT DOOR LOCK ASSEMBLY
OK


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


    B111707E06

  1. LHD Models:
    Disconnect the front door lock assembly LH connector.

    1. Disconnect the multiplex network master switch assembly connector.

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

      Standard resistance:
      Tester Connection
      		Condition
      		Specified Condition
      D10-9 (L) - P19-4 (KL)
      		Always
      		Below 1 Ω
      D10-10 (UL) - P19-14 (KUL)
      		Always
      		Below 1 Ω
      D10-7(E) - Body ground
      		Always
      		Below 1 Ω



    B111707E08

  1. RHD Models:
    Disconnect the front door lock assembly RH connector.

    1. Disconnect the multiplex network master switch assembly connector.

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

      Standard resistance:
      Tester Connection
      		Condition
      		Specified Condition
      D10-6 (L) - P19-4 (KL)
      		Always
      		Below 1 Ω
      D10-5 (UL) - P19-14 (KUL)
      		Always
      		Below 1 Ω
      D10-8(E) - Body ground
      		Always
      		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE