2003 LEXUS LS430 diagram

Fig. 17: Climate Control Does Not Operate (Blinking Pattern 1) Wiring Diagram (1 Of 3)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 18: Climate Control Does Not Operate (Blinking Pattern 1) Wiring Diagram (2 Of 3)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 19: Climate Control Does Not Operate (Blinking Pattern 1) Wiring Diagram (3 Of 3)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.CHECK CLIMATE CONTROL SWITCH (INDICATOR)
a. Check that the climate control indicator is blinkin
g.

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
OK: REPLACE SEAT CLIMATE CONTROL BLOWER (CLIMATE CONTROL ECU)
CIRCUIT DESCRIPTION
When the climate control switch's volume control circuit is open or short circuit and abnormal codes are input to
the VS terminal, all output will be stopped and the indicator illuminates according to blinking pattern 2.
WIRING DIAGRAM

Fig. 29: Climate Control Does Not Operate (Blinking Pattern 2) Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.INSPECT FRONT SEAT HEATER SWITCH (INDICATOR)
a. Check that the climate control indicator is blinkin
g.

Fig. 31: Identifying Seat Climate Control Blower Connector Terminals And Climate Control
Switch Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
OK: REPLACE SEAT CLIMATE CONTROL BLOWER (CLIMATE CONTROL ECU)
CIRCUIT DESCRIPTION
As a result of an short circuit, the ECU may not be able to provide 5 V of power voltage to the seat climate
controller thermistor circuit, climate control switch's volume control circuit or rear seat heater thermistor circuit.
If this happens, all output will be stopped and the indicator illuminates according to blinking pattern 3.
WIRING DIAGRAM

Fig. 32: Climate Control Does Not Operate (Blinking Pattern 3) Wiring Diagram (1 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 33: Climate Control Does Not Operate (Blinking Pattern 3) Wiring Diagram (2 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.