Wiring diagram LEXUS LS430 2003 Factory Repair Manual

Fig. 14: Wiring Diagram - Driver Door ECU Power Source Circuit
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.INSPECT FUSE (MPX-IG, AM1, D DOOR, MPX-B1, D/C CUT)
a. Remove the MPX-IG and AM1 fuses from the driver side J/B.
b. Remove the D DOOR and MPX-B1 fuses from the passenger side J/B.
c. Remove the D/C CUT fuse from the FL block assy.
d. Measure the resistance.

CIRCUIT DESCRIPTION
The driver door ECU detects the condition of the front door courtesy lamp switch and sends a switch signal to
the related ECUs via the multiplex communication circuit.
WIRING DIAGRAM
Fig. 17: Wiring Diagram
- Door Courtesy Switch Circuit
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.READ VALUE OF DATA LIST (FRONT DOOR COURTESY LAMP SWITCH)
a. Check the DATA LIST for proper functioning of the door courtesy switch
Multiplex network body ECU (Driver door ECU):