Power Door Lock Control System Only Rear Door Rh 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 RH)

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

INSPECT REAR DOOR LOCK ASSEMBLY RH

READ VALUE OF INTELLIGENT TESTER (DOOR LOCK POSITION SWITCH)

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

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

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


DESCRIPTION

The rear door ECU RH 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 Rh 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 RH:

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 RH

2.INSPECT FUSE (RR DOOR RH)

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

  1. Measure the resistance of the fuse.

    Standard resistance:
    Below 1 Ω


NG
REPLACE FUSE
OK


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

  1. Disconnect the P3 ECU connector.

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

    Standard voltage:
    Tester Connection
    		Specified Condition
    P3-6 (BDR) - P3-1 (GND)
    		10 to 14 V
    P3-4 (CPUB) - P3-1 (GND)
    		10 to 14 V

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    P3-1 (GND) - Body ground
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


4.INSPECT REAR DOOR LOCK ASSEMBLY RH

Lexus Gs430, Gs300. Uzs190 Grs190.Door Lock.Power Door Lock Control System.Power Door Lock Control System Only Rear Door Rh 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 4
    Battery negative (-) → Terminal 3
    		Lock
    Battery positive (+) → Terminal 3
    Battery negative (-) → Terminal 4
    		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 RH
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 RH:

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


NG
Go to step 6
OK

REPLACE REAR DOOR ECU RH

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

Lexus Gs430, Gs300. Uzs190 Grs190.Door Lock.Power Door Lock Control System.Power Door Lock Control System Only Rear Door Rh 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
    9 - 10
    		Unlock
    		Below 1 Ω
    9 - 10
    		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 RH
OK


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

  1. Disconnect the P2 ECU connector.

  1. Disconnect the P5 door lock connector.

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

    Standard resistance:
    w/ Double locking system
    Tester Connection
    		Specified Condition
    P2-1 (A-) - P5-3 (UL)
    		Below 1 Ω
    P2-2 (A+) - P5-4 (L)
    		Below 1 Ω
    P2-14 (LSW) - P5-9 (LSSR)
    		Below 1 Ω
    P2-13 (LSWE) - P5-10 (E)
    		Below 1 Ω
    w/o Double locking system:
    Tester Connection
    		Specified Condition
    P2-1 (A-) - P5-1 (UL)
    		Below 1 Ω
    P2-2 (A+) - P5-4 (L)
    		Below 1 Ω
    P2-14 (LSW) - P5-6 (LSSR)
    		Below 1 Ω
    P2-13 (LSWE) - P5-9 (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 RH