2003 LEXUS LS430 Diagram AC

Fig. 65: Checking Wire Harness (Rear Door LH ECU -Rear Door Lock Assy LH)
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 closer position switch, which detects the position of the closer.
WIRING DIAGRAM
Fig. 66: Door Closer Position Switch Circuit On Rear Right Side Door
- Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.READ VALUE OF DATA LIST (DOOR CLOSER POSITION SWITCH (POLE/HALF/ FULL))
1. Check the DATA LIST for proper functioning of the door closer position switch and lock position
switch.
REAR DOOR ECU RH
Item
Measurement item / Display
(Range)
Normal ConditionPosition

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.

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.

NG: REPLACE FRONT DOOR LOCK ASSY RH
OK: REPLACE PASSENGER 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. 78: Door Closer Motor Circuit On Rear Left Side Door
- Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.INSPECT REAR DOOR LOCK ASSY LH (DOOR LOCK MOTOR)
a. Disconnect the R36 ECU connector.
b. Apply battery voltage to the door lock and check operation of the door lock motor.
SPECIFIED CONDITION

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE REAR DOOR LOCK ASSY LH
OK: REPLACE REAR DOOR ECU LH
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. 82: Door Closer Motor Circuit On Rear Right Side Door
- Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.INSPECT REAR DOOR LOCK ASSY RH (DOOR LOCK MOTOR)
a. Disconnect the R37 ECU connector.
b. Apply battery voltage to the door lock and check operation of the door lock motor.

Fig. 3: Wiring Diagram - Dynamic Laser Cruise Control System
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Input and output signals of each ECU.

CIRCUIT DESCRIPTION
See CIRCUIT DESCRIPTION
.
Fig. 42: DTC P0500 And P0503 Problem Symptom Diagnostic Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
WIRING DIAGRAM
See WIRING DIAGRAM
.
INSPECTION PROCEDURE
See INSPECTION PROCEDURE
.
CIRCUIT DESCRIPTION
When the brake pedal is depressed, the stop lamp switch assy sends a signal to the ECM. When the ECM
receives this signal, it cancels the cruise control.
The fail-safe function operates to enable normal driving even if there is a malfunction in the stop lamp signal
circuit.
The cancel condition occurs when positive battery voltage is applied to terminal STP.
When the brake is applied, battery positive voltage is normally applied to terminal STP of the ECM through the
STOP fuse and the stop lamp switch ass
y, and the ECM turns the cruise control off.

Fig. 43: DTC P0571 Problem Symptom Diagnostic Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
WIRING DIAGRAM