2003 LEXUS LS430 Factory Repair Manual

Page 337 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 104: Checking Harness And Connector (Cool Air Bypass Servomotor - Air Conditioning 
Amplifier) 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR  
OK: REPL

Page 338 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 105: TPBPR Terminal Voltage/Damper Opening Angle Graph 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
Fig. 106: DTC Detection Item Trouble Area Chart
 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC

Page 339 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 107: Max Cool Damper Position Sensor Circuit (Passenger Side) 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
INSPECTION PROCEDURE 
1.READ VALUE ON HAND-HELD TESTER 
a. Connect the hand-held teste

Page 340 of 4500

LEXUS LS430 2003  Factory Repair Manual OK:  
The display is as specified in the normal condition.  
Result:  
AIR CONDITIONER TEST RESULT 
B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
C: REPLACE AIR CONDITIONING AM

Page 341 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 108: Inspecting Air Conditioning Amplifier (TPBPA - SG (SG-7) 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
C: REPLACE AIR C

Page 342 of 4500

LEXUS LS430 2003  Factory Repair Manual HINT: 
SEE COOL AIR BYPASS DAMPER CONTROL SERVOMOTOR CIRCUIT (PASSENGER 
SIDE) for operation procedure for cool air bypass servomotor. 
Standard:  
COOL AIR BYPASS SERVOMOTOR RESISTANCE 
HINT: 
As the

Page 343 of 4500

LEXUS LS430 2003  Factory Repair Manual OK: Go to next step  
4.CHECK HARNESS AND CONNECTOR (COOL AIR BYPASS SERVOMOTOR - AIR 
CONDITIONING AMPLIFIER) (SEE ELECTRONIC CIRCUIT INSPECTION PROCEDURE
 ) 
a. Measure the resistance according to t

Page 344 of 4500

LEXUS LS430 2003  Factory Repair Manual