2003 LEXUS LS430 Factory Repair Manual

Page 569 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 87: Inspecting Air Sus Relay 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
4.CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - AIR SUS RELAY) 
(SEE ELECTRONIC CIRCUIT INSPECTION PROCEDURE
 )

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LEXUS LS430 2003  Factory Repair Manual Fig. 88: Identifying Suspension Control ECU Connector Terminals 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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LEXUS LS430 2003  Factory Repair Manual Fig. 89: Identifying Fusible Link Block Side Connector Terminals 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR  
OK:Go to next step  
5.CHECK HARNESS AND CO

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LEXUS LS430 2003  Factory Repair Manual Fig. 90: Identifying Air Sus Relay Location 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR  
OK: REPLACE SUSPENSION CONTROL ECU (SEE REPLACEMENT
 )  
CIRCUIT

Page 573 of 4500

LEXUS LS430 2003  Factory Repair Manual Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
WIRING DIAGRAM 
Fig. 92: Height Control Compressor Wiring Diagram
 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
INSPECTION PROCEDURE 
1.RECONFIRM DTC 
a.

Page 574 of 4500

LEXUS LS430 2003  Factory Repair Manual HINT: 
If DTC C1741 (AIR SUS relay circuit) is displayed, carry out the inspection necessary (SEE DTC C1741 
AIR SUS RELAY CIRCUIT ). 
NG: REPAIR CIRCUIT INDICATED BY OUTPUT CODE  
OK:Go to next step

Page 575 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 93: Identifying Height Control Compressor Motor Connector Terminals 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
3.CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - HEIGHT 
CONTROL COMPRESS

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LEXUS LS430 2003  Factory Repair Manual Fig. 94: Identifying Suspension Control ECU Connector Terminals 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
OK:Go to next step  
4.CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL COMPRESSOR MOTOR - 
BO