LEXUS LS430 2003 Factory Repair Manual

OK: Go to Next Step.
4.CHECK WIRE HARNESS (REAR DOOR RH ECU - REAR DOOR LOCK ASSY RH)
a. Disconnect the R37-a lock connector.
b. Disconnect the R37 ECU connector.
c. Measure the resistance of the wire harness side connectors
TERMINALS RESISTANCE REFERENCE
Tester ConnectionSpecified Condition
R37-a-2 - R37-23 (POLE)Below 1 ohms
R37-a-1 - R37-24 (HALF)Below 1 ohms
R37-a-4 - R37-15 (FULL)Below 1 ohms
R37-a-5 - R37-21 (DLEL)Below 1 ohms
R37-a-2 - Body ground10 kohms or higher
R37-a-1 - Body ground10 kohms or higher
R37-a-4 - Body ground10 kohms or higher
R37-a-5 - Body ground10 kohms or higher

Fig. 69: Checking Wire Harness (Rear Door RH ECU -Rear Door Lock Assy RH)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE COMBINATION SWITCH ASSY
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS
TABLE
CIRCUIT DESCRIPTION
The door lock assembly has a built-in door closer motor.
The door ECU actuates the door closer motor to fully close the door.
WIRING DIAGRAM
Fig. 70: Door Closer Motor Circuit On Driver Side Door
- Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.INSPECT FRONT DOOR LOCK ASSY LH (DOOR LOCK MOTOR)
a. Disconnect the F23 ECU connector.

b. Apply battery voltage to the door lock and check operation of the door lock motor.
SPECIFIED CONDITION
Measurement ConditionSpecified Condition
Battery positive (+) --> Terminal 2 Battery negative (-) -->
Terminal 1Moves to LOCK
Battery positive (+) --> Terminal 1 Battery negative (-) -->
Terminal 2Moves to UNLOCK

Fig. 71: Inspecting Front Door Lock Assy LH (Door Lock Motor)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE FRONT DOOR LOCK ASSY LH
OK: Go to Next Step.
2.INSPECT FRONT DOOR LOCK ASSY LH (POSITION SWITCH)
a. Disconnect the F23 ECU connector.
b. Measure the resistance of the position switch.
Terminals Resistance Reference
Tester ConnectionDoor Lock ConditionSpecified Condition
7 - 20LOCK10 kohms or higher
7 - 20UNLOCKBelow 1 ohms

Fig. 72: Inspecting Front Door Lock Assy LH (Position Switch)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE FRONT DOOR LOCK ASSY LH
OK: Go to Next Step.
3.INSPECT FRONT DOOR LOCK ASSY LH (DOOR CLOSER MOTOR)
a. Disconnect the F23 ECU connector.
b. Apply battery voltage and check operation of the door closer link.
SPECIFIED CONDITION
Measurement ConditionSpecified Condition
Battery positive (+) --> Terminal 5 Battery negative (-) -->
Terminal 6Moves to FULL
Battery positive (+) --> Terminal 6 Battery negative (-) -->
Terminal 5Moves to INITIAL

Fig. 73: Inspecting Front Door Lock Assy LH (Door Closer Motor)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE FRONT DOOR LOCK ASSY LH
OK: REPLACE DRIVER DOOR ECU
CIRCUIT DESCRIPTION
The door lock assembly has a built-in door closer motor.
The door ECU actuates the door closer motor to fully close the door.
WIRING DIAGRAM
Fig. 74: Door Closer Motor Circuit On Passenger Side Door
- Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.INSPECT FRONT DOOR LOCK ASSY RH (DOOR LOCK MOTOR)
a. Disconnect the F24 ECU connector.
b. Apply battery voltage to the door lock and check operation of the door lock motor.