2003 LEXUS LS430 Factory Repair Manual

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LEXUS LS430 2003  Factory Repair Manual Fig. 129: Cool Air Bypass Damper Control Servomotor Circuit (Passenger Side) 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
INSPECTION PROCEDURE 
1.PERFORM ACTUATOR CHECK
 
a. Warm up the engine.  
b.

Page 370 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 130: Inspecting Cool Air Bypass Servomotor 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
NG: REPLACE COOL AIR BYPASS SERVOMOTOR  
OK: Go to next step  
3.CHECK HARNESS AND CONNECTOR (COOL AIR BY

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LEXUS LS430 2003  Factory Repair Manual C25-5 (MSNUT) - Body groundAlways10 kohms or higher
C25-1 (VZ) - Body groundAlways10 kohms or higher
C25-2 (GND) - Body groundAlwaysBelow 1 ohms

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LEXUS LS430 2003  Factory Repair Manual Fig. 131: Checking Harness And Connector (Cool Air Bypass Servomotor - Air Conditioning

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LEXUS LS430 2003  Factory Repair Manual Amplifier) 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR  
OK: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT
 )  
CIRCUIT DESCRIPTION 
This circuit co

Page 374 of 4500

LEXUS LS430 2003  Factory Repair Manual INSPECTION PROCEDURE 
1.PERFORM ACTUATOR CHECK
 
a. Warm up the engine.  
b. Set the actuator check mode (SEE ACTUATOR CHECK
 ).  
c. Press the driver temperature up switch, and change to STEP operati

Page 375 of 4500

LEXUS LS430 2003  Factory Repair Manual OK:  
Water valve lever changes in accordance with each display code.  
NG: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT
 )  
OK: Go to next step  
2.INSPECT WATER VALVE SERVOMOTOR 
a. Remove t

Page 376 of 4500

LEXUS LS430 2003  Factory Repair Manual NG: REPLACE WATER VALVE SERVOMOTOR
OK: Go to next step  
3.CHECK HARNESS AND CONNECTOR (WATER VALVE SERVOMOTOR - AIR 
CONDITIONING AMPLIFIER) (SEE ELECTRONIC CIRCUIT INSPECTION PROCEDURE
 ) 
a. Measur