2003 LEXUS LS430 Factory Repair Manual

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Page 4425 of 4500

LEXUS LS430 2003 Factory Repair Manual Standard: SPECIFIED CONDITION If the result is not as specified, there may be a malfunction on the wire harness side. 1.DESCRIPTION Key reminder warning system data can be read in the Data Link C

Page 4426 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 10: Identifying Terminals Of DLC3 Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. SPECIFIED CONDITION 3.INSPECT BATTERY VOLTAGE Standard: 11 to 14 V If voltage is below 11 V, recharge the batter

Page 4427 of 4500

LEXUS LS430 2003 Factory Repair Manual Using the hand-held tester's DATA LIST allows switch, sensor, actuator and other item values to be read without removing any parts. Reading the DATA LIST early in troubleshooting is one way to sa

Page 4428 of 4500

LEXUS LS430 2003 Factory Repair Manual to save time. The DATA LIST can be displayed during the ACTIVE TEST. a. Connect the hand-held tester (with CAN VIM) to the DLC3. b. Turn the ignition switch ON. c. Perform the ACTIVE TEST accordi

Page 4429 of 4500

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

Page 4430 of 4500

LEXUS LS430 2003 Factory Repair Manual 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. Standard: Fig.

Page 4431 of 4500

LEXUS LS430 2003 Factory Repair Manual 3.CHECK WIRE HARNESS (DRIVER DOOR ECU - BATTERY AND BODY GROUND) a. Disconnect the D25 ECU connector. b. Measure the voltage and resistance of the wire harness side connector. Standard: Fig. 16

Page 4432 of 4500

LEXUS LS430 2003 Factory Repair Manual 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 DI
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