2003 LEXUS LS430 ignition

Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
OK: Go to next step
4.CHECK SEAT CLIMATE CONTROL CONTROLLER (SEAT CUSHION)
HINT:
When the driver side indicator is blinking, check the driver side connector. When the passenger side
indicator is blinking, check the passenger side connector.
a. Disconnect the S48 or S49 connector.
b. Connect terminal 3 (TDC+) and 6 (TDC-) of the climate control ECU connector, as shown in the
illustration.
c. Turn the ignition switch ON.
d. Turn the climate control switch ON, and then check that the climate control switch indicator turns
off.
OK: The indicator turns off

<0029004c004a0011000300150015001d00030026004b00480046004e004c0051004a0003003600480044005700030026004f004c00500044005700480003002600520051005700550052004f0003002600520051005700550052004f004f00480055000300
0b00360048004400570003002600580056004b004c00520051[)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE SEAT CLIMATE CONTROL BLOWER REPAIR SEAT CLIMATE CONTROL
BLOWER (CLIMATE CONTROL ECU)
OK: REPLACE SEAT CLIMATE CONTROLLER (SEAT CUSHION)
5.CHECK SEAT CLIMATE CONTROL CONTROLLER (SEATBACK)
HINT:
When the rear LH indicator is blinking, check the rear LH connector. When the rear RH indicator is
blinking, check the rear RH connector.
a. Disconnect the S52 or S54 controller connector.
b. Connect the wire harness to terminal 4 (TDB-) and 5 (TDB+) of the wire harness side connector.
c. Turn the ignition switch ON.
d. Turn the climate control switch ON, and then check that the climate control indicator continues
blinking.

Fig. 24: Identifying Seat Climate Control Blower Connector Terminals And Seat Climate
Controller Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
OK: Go to next step
7.CHECK SEAT CLIMATE CONTROL CONTROLLER (SEAT CUSHION)
HINT:
When the rear LH indicator is blinking, check the rear LH connector. When the rear RH indicator is
blinking, check the rear RH connector.
a. Disconnect the S53 or S55 blower connector.
b. Connect the wire harness to terminal 5 (TDC+) and 4 (TDC-) of the wire harness side connector, as
shown in the illustration.
c. Turn the ignition switch ON.
d. Turn the climate control switch ON, and then check that the climate control indicator turns off.
OK: The indicator turns off

TESTER CONNECTION AND SPECIFIED CONDITION - DRIVER SIDE
Passenger side
TESTER CONNECTION AND SPECIFIED CONDITION - PASSENGER SIDE
Fig. 35: Identifying Seat Climate Control Blower Connector Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE SEAT CLIMATE CONTROL CONTROLLER (CLIMATE CONTROL ECU)
OK: Go to next step
5.INSPECT SEAT CLIMATE CONTROL CONTROLLER (THERMISTOR OF SEATBACK)
Tester ConnectionConditionSpecified Condition
C20-13 (V5) - Body GroundIgnition switch ON5 V
Tester ConnectionConditionSpecified Condition
C21-13 (V5) - Body GroundIgnition switch ON5 V

Fig. 38: Identifying Seat Climate Control Blower Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
OK: Go to next step
10.CHECK WIRE HARNESS (SEAT CLIMATE CONTROL BLOWER (CLIMATE CONTROL
ECU) - BODY GROUND)
HINT:
When the rear LH indicator is blinking, check the rear LH side connector. When the rear RH indicator is
blinking, check the rear right RH side connector.
a. Measure the voltage of the wire harness side connector.
Standard:
Rear LH
TESTER CONNECTION AND SPECIFIED CONDITION - REAR LH
Rear RH
TESTER CONNECTION AND SPECIFIED CONDITION - REAR RH
Tester ConnectionConditionSpecified Condition
C27-18 (V5) - Body groundIgnition switch ON, Climate control switch ON5 V
Tester ConnectionConditionSpecified Condition
C29-18 (V5) - Body groundIgnition switch ON, Climate control switch ON5 V

b. Measure the voltage of the wire harness side connector.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
Fig. 52: Identifying Seat Climate Control Blower Connector Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: Go to step 4
OK: Go to next step
3.CHECK WIRE HARNESS (SEAT CLIMATE CONTROL BLOWER (CLIMATE CONTROL
ECU) - BODY GROUND)
a. Disconnect the C20 blower connector.
Tester ConnectionConditionSpecified Condition
C20-7 (IG) - Body groundIgnition switch ON10 to 14 V

Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
Fig. 54: Identifying Driver Side J/B Connector Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: Go to step 5
OK: REPAIR OR REPLACE HARNESS AND CONNECTOR (DRIVER SIDE J/B - CLIMATE
CONTROL BLOWER (CLIMATE CONTROL ECU))
5.CHECK WIRE HARNESS (DRIVER SIDE J/B - BATTERY)
a. Disconnect the DA and DF J/B connectors.
Tester ConnectionConditionSpecified Condition
DJ-6 - Body groundIgnition switch ON10 to 14 V

b. Measure the voltage of the wire harness side connectors.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
Tester ConnectionConditionSpecified Condition
DA-1 - Body groundAlways10 to 14 V
DF-4 - Body groundIgnition switch ON10 to 14 V