2003 LEXUS LS430 Factory Repair Manual

Page 601 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 116: Identifying AM1 Fuse Location 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
NG: CHECK FOR SHORT IN ALL HARNESS AND CONNECTOR CONNECTED TO FUSE 
AND REPLACE FUSE  
OK:Go to next step  
4.INS

Page 602 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 117: Identifying Air sus Fuse Location 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
NG: CHECK FOR SHORT IN ALL HARNESS AND CONNECTOR CONNECTED TO FUSE 
AND REPLACE FUSE

Page 603 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 118: Tester Connection Specified Condition Description Table 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
OK: REPLACE SUSPENSION CONTROL ECU (SEE REPLACEMENT
 )  
5.INSPECT SUSPENSION CONTROL E

Page 604 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 119: Identifying Suspension Control ECU Connector Terminals 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
OK: REPLACE SUSPENSION CONTROL ECU (SEE REPLACEMENT
 )  
6.CHECK HARNESS AND CONNECTOR (

Page 605 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 120: Identifying Suspension Control ECU Connector Terminals 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR  
OK: REPLACE SUSPENSION CONTROL ECU (SEE REP

Page 606 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 121: DTC C1776 Detecting Condition And Trouble Area 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
WIRING DIAGRAM 
Fig. 122: Speed Sensor Wiring Diagram
 
Courtesy of TOYOTA MOTOR SALES, U.S.A.,

Page 607 of 4500

LEXUS LS430 2003  Factory Repair Manual HINT: 
There is tolerance of +/- 10 % in the speedometer indication. 
NG: Go to step 2  
OK: REPLACE SUSPENSION CONTROL ECU (SEE REPLACEMENT
 )  
2.CHECK DIAGNOSTIC CODE OUTPUT 
a. Check if the normal

Page 608 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 124: Steering Angle Sensor Wiring Diagram 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
INSPECTION PROCEDURE 
1.READ VALUE ON HAND-HELD TESTER 
a. Connect the han
d-held tester to the DLC3.