2003 LEXUS LS430 diagram

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS
TABLE
CIRCUIT DESCRIPTION
This circuit supplies power to operate the rear door LH ECU.
WIRING DIAGRAM

Fig. 48: Rear Door LH ECU Power Source Circuit - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.INSPECT FUSE (MPX-IG, AM1, RR DOOR LH, MPX-B1, D/C CUT)
a. Remove the MPX-IG and AM1 fuses from the driver side J/B.

CIRCUIT DESCRIPTION
This circuit supplies power to operate the rear door RH ECU.
WIRING DIAGRAM

Fig. 51: Rear Door RH ECU Power Source Circuit -Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.INSPECT FUSE (MPX-IG, AM1, RR DOOR RH, MPX-B1, D/C CUT)
a. Remove the MPX-IG and AM1 fuses from the driver side J/B.
b. Remove the MPX-B1 and RR DOOR RH fuses from the passenger side J/B.
c. Remove the D/C CUT fuse from the FL block assy.
d. Measure the resistance.
Standard: Below 1 ohms
NG: REPLACE FUSE
OK: Go to Next Step.
2.INSPECT RELAY (Marking: D-IG1)
a. Remove the D-IG1 relay from the driver side J/B.
b. Measure the resistance.
Fig. 52: Inspecting Relay (D
-IG1)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
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. 54: Door Closer Position Switch Circuit On Driver 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))
a. Check the DATA LIST for proper functioning of the door closer position switch.
DRIVER DOOR EC
R14-1 (CPUB) - Body groundAlways10 to 14 V
R14-2 (BDR) - Body groundAlways10 to 14 V
R14-26 (SIG) Body groundIgnition switch ON10 to 14 V
Measurement item / Display

Fig. 57: Checking Wire Harness (Driver Door ECU -Front Door Lock Assy LH)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
TERMINALS RESISTANCE REFERENCE
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
Tester ConnectionSpecified Condition
F23-a-2 - F23-23 (POLE)Below 1 ohms
F23-a-1 - F23-24 (HALF)Below 1 ohms
F23-a-4 - F23-15 (FULL)Below 1 ohms
F23-a-5 - F23-21 (KEYE)Below 1 ohms
F23-a-2 - Body ground10 kohms or higher
F23-a-1 - Body ground10 kohms or higher
F23-a-4 - Body ground10 kohms or higher
F23-a-5 - Body ground10 kohms or higher

Fig. 58: Door Closer Position Switch Circuit On Passenger 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))
a. Check the DATA LIST for proper functioning of the door closer position switch.
PASSENGER DOOR ECU
OK: "ON" (door closer position switch (POLE/HALF/FULL) is ON) appears on the screen.
NG: Go to step 2
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS
TABLE
2.INSPECT COMBINATION SWITCH ASSY (HALF LATCH AND FULL LATCH SWITCH)
a. Disconnect the F24-a lock connector.
b. Measure the resistance.
Item
Measurement item / Display
(Range)
Normal ConditionPosition
POLE SWPawl switch signal/ ON or OFFRefer to system description of door ECU (SEE
SYSTEM DESCRIPTION
)
-
HALF SWHalf switch signal/ ON or OFFRefer to system description of door ECU (SEE
SYSTEM DESCRIPTION
)
-
FULL SWFull switch signal/ ON or OFFRefer to system description of door ECU (SEE
SYSTEM DESCRIPTION
)
-

Fig. 61: Checking Wire Harness (Passenger Door ECU -Front 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 closer position switch, which detects the position of the closer.
WIRING DIAGRAM
Fig. 62: Door Closer Position Switch Circuit On Rear Left 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))
a. Check the DATA LIST for proper functioning of the door closer position switch.
REAR DOOR LH ECU
Item
Measurement item / Display
(Range)
Normal ConditionPosition
POLE SWPawl switch signal/ ON or OFFRefer to system description of door ECU -