Power Door Lock Control System Only Rear Door Lh Lock / Unlock Functions Do Not Operate

Body Electrical. Lexus Gs430, Gs300. Uzs190 Grs190
Door Lock. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST BY INTELLIGENT TESTER (REAR DOOR LOCK MOTOR)

INSPECT FUSE (RR DOOR LH)

CHECK WIRE HARNESS (REAR DOOR ECU LH - BATTERY AND BODY GROUND)

INSPECT REAR DOOR LOCK ASSEMBLY LH

READ VALUE OF INTELLIGENT TESTER (DOOR LOCK POSITION SWITCH)

INSPECT REAR DOOR LOCK ASSEMBLY LH (DOOR LOCK POSITION SWITCH)

CHECK WIRE HARNESS (REAR DOOR ECU LH - REAR DOOR LOCK ASSEMBLY LH)

POWER DOOR LOCK CONTROL SYSTEM - Only Rear Door LH LOCK / UNLOCK Functions do not Operate


DESCRIPTION

The rear door ECU LH receives lock/unlock switch signals and activates the door lock motor according to the signals.

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Door Lock.Power Door Lock Control System.Power Door Lock Control System Only Rear Door Lh Lock / Unlock Functions Do Not Operate


INSPECTION PROCEDURE

1.PERFORM ACTIVE TEST BY INTELLIGENT TESTER (REAR DOOR LOCK MOTOR)

  1. Select the Active Test, use the intelligent tester to generate a control command, and then check that the door lock motor operates.

    Rear door ECU LH:

    Item
    		Test Details
    		Diagnostic Note
    Door Lock
    		Operate door lock motor LOCK/UNLOCK
    		-
OK:
Door locks/unlocks.


NG
Go to step 2
OK

REPLACE REAR DOOR ECU LH

2.INSPECT FUSE (RR DOOR LH)

  1. Remove the RR DOOR LH fuse from the cowl side junction block LH.

  1. Measure the resistance of the fuse.

    Standard resistance:
    Below 1 Ω


NG
REPLACE FUSE
OK


3.CHECK WIRE HARNESS (REAR DOOR ECU LH - BATTERY AND BODY GROUND)
Lexus Gs430, Gs300. Uzs190 Grs190.Door Lock.Power Door Lock Control System.Power Door Lock Control System Only Rear Door Lh Lock / Unlock Functions Do Not Operate

  1. Disconnect the Q2 ECU connector.

  1. Measure the voltage of the wire harness side connector.

    Standard voltage:
    Tester Connection
    		Specified Condition
    Q2-4 (CPUB) - Body ground
    		10 to 14 V
    Q2-6 (BDR) - Body ground
    		10 to 14 V

  1. Measure the resistance of the wire harness side connector.

    Standard resistance:
    Tester Connection
    		Specified Condition
    Q2-1 (GND) - Body ground
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


4.INSPECT REAR DOOR LOCK ASSEMBLY LH

Lexus Gs430, Gs300. Uzs190 Grs190.Door Lock.Power Door Lock Control System.Power Door Lock Control System Only Rear Door Lh Lock / Unlock Functions Do Not Operate

  1. Apply battery voltage to the door lock motor and check the operation of the door lock motor.

    OK:
    w/ Double locking system
    Measurement Condition
    		Specified Condition
    Battery positive (+) → Terminal 2
    Battery negative (-) → Terminal 1
    		Lock
    Battery positive (+) → Terminal 1
    Battery negative (-) → Terminal 2
    		Unlock
    w/o Double locking system:
    Measurement Condition
    		Specified Condition
    Battery positive (+) → Terminal 4
    Battery negative (-) → Terminal 1
    		Lock
    Battery positive (+) → Terminal 1
    Battery negative (-) → Terminal 4
    		Unlock


NG
REPLACE REAR DOOR LOCK ASSEMBLY LH
OK


5.READ VALUE OF INTELLIGENT TESTER (DOOR LOCK POSITION SWITCH)

  1. Check the Data List for proper functioning of the door lock position switch.


Rear door ECU LH:

Item
Measurement Item/Display (Range)
Normal Condition
Diagnostic Note
Door Unlock Detection SW
Rear door LH side door lock position switch/ON or OFF
ON: Rear door LH side door is unlocked
OFF: Rear door LH side door is locked
-
OK:
ON (rear door LH side door is unlocked) appears on screen.


NG
Go to step 6
OK

REPLACE REAR DOOR ECU LH

6.INSPECT REAR DOOR LOCK ASSEMBLY LH (DOOR LOCK POSITION SWITCH)

Lexus Gs430, Gs300. Uzs190 Grs190.Door Lock.Power Door Lock Control System.Power Door Lock Control System Only Rear Door Lh Lock / Unlock Functions Do Not Operate

  1. Measure the resistance of the switch.

    Standard resistance:
    w/ Double locking system
    Tester Connection
    		Switch Condition
    		Specified Condition
    5 - 6
    		Unlock
    		Below 1 Ω
    5 - 6
    		Lock
    		10 kΩ or higher
    w/o Double locking system:
    Tester Connection
    		Switch Condition
    		Specified Condition
    6 - 9
    		Unlock
    		Below 1 Ω
    6 - 9
    		Lock
    		10 kΩ or higher


NG
REPLACE REAR DOOR LOCK ASSEMBLY LH
OK


7.CHECK WIRE HARNESS (REAR DOOR ECU LH - REAR DOOR LOCK ASSEMBLY LH)
Lexus Gs430, Gs300. Uzs190 Grs190.Door Lock.Power Door Lock Control System.Power Door Lock Control System Only Rear Door Lh Lock / Unlock Functions Do Not Operate

  1. Disconnect the Q3 ECU connector.

  1. Disconnect the Q5 door lock connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    w/ Double locking system
    Tester Connection
    		Specified Condition
    Q3-1 (A-) - Q5-1 (UL)
    		Below 1 Ω
    Q3-2 (A+) - Q5-2 (L)
    		Below 1 Ω
    Q3-14 (LSW) - Q5-5 (LSSR)
    		Below 1 Ω
    Q3-13 (LSWE) - Q5-6 (E)
    		Below 1 Ω
    w/o Double locking system:
    Tester Connection
    		Specified Condition
    Q3-1 (A-) - Q5-1 (UL)
    		Below 1 Ω
    Q3-2 (A+) - Q5-4 (L)
    		Below 1 Ω
    Q3-14 (LSW) - Q5-6 (LSSR)
    		Below 1 Ω
    Q3-13 (LSWE) - Q5-9 (E)
    		Below 1 Ω
    HINT:
    *1: w/ Double locking system
    *2: w/o Double locking system


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE REAR DOOR ECU LH