LEXUS LS430 2003 Factory Repair Manual

If the result is not as specified, replace the switch or bulb.
Measurement ConditionCondition
Battery positive (+) --> Terminal 20 (ILL+) Battery negative (-) --> Terminal 5
(ILL-)Illuminates

Fig. 77: Identifying Traction Control Switch Connector Terminals -Driver Side (Climate Control
Switch Front)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
2.Passenger's side:
INSPECT TRACTION CONTROL SWITCH (CLIMATE CONTROL SWITCH FRONT)
a. Measure the resistance between the terminals when the switch is operated.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
HINT:
As the dial is being turned, the resistance changes gradually.
If the result is not as specified, replace the switch.
b. Check that the climate control switch indicator illuminates.
OK:
MEASUREMENT CONDITION AND SPECIFIED CONDITION
If the result is not as specified, replace the switch or bulb.
c. Check that the climate control switch illuminates.
OK:
MEASUREMENT CONDITION AND SPECIFIED CONDITION
If the result is not as specified, replace the switch or bulb.
Tester ConnectionConditionSpecified Condition
15 (RV5) - 16 (RVS)Switch ON (RH) Max. COOL to Max. WARM0 to 5 kohms
Measurement ConditionSwitch
ConditionSpecified
Condition
Battery positive (+) --> Terminal 2 (RIND) Battery negative (-
) --> Terminal 6 (E)ON (RH)Illuminates
Measurement ConditionSpecified
Condition
Battery positive (+) --> Terminal 20 (ILL+) Battery negative (-) --> Terminal 5
(ILL-)Illuminates

Fig. 78: Identifying Traction Control Switch Connector Terminals - Passenger Side (Climate
Control Switch Front)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
3.INSPECT SEAT CLIMATE CONTROLLER LH (FRONT SEAT CUSHION)
a. Measure the resistance between the terminals.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
If the result is not as specified, replace the controller.
b. Measure the thermistor resistance between the terminals.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
HINT:
As the temperature increases, the resistance decreases.
If the result is not as specified, replace the controller.
Tester ConnectionSpecified Condition
3 (TDC+) - 6 (TDC-)Below 1 ohms
Tester ConnectionConditionSpecified Condition
1 (TCS) - 2 (TC5)Controller temperature 10°C (50°F)3.6 to 3.8 kohms
1 (TCS) - 2 (TC5)Controller temperature 25°C (77°F)1.9 to 2.1 kohms
1 (TCS) - 2 (TC5)Controller temperature 30°C (86°F)1.6 to 1.7 kohms

Fig. 79: Identifying Seat Climate Controller LH Connector Terminals (Front Seat Cushion)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
4.INSPECT SEAT CLIMATE CONTROLLER RH (FRONT SEAT CUSHION)
a. Measure the resistance between the terminals.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
If the result is not as specified, replace the controller.
b. Measure the thermistor resistance between the terminals.
Standard:
Tester ConnectionSpecified Condition
3 (TDC+) - 6 (TDC-)Below 1 ohms

TESTER CONNECTION AND SPECIFIED CONDITION
HINT:
As the temperature increases, the resistance decreases.
If the result is not as specified, replace the controller.
Fig. 80: Identifying Seat Climate Controller RH Connector Terminals (Front Seat Cushion)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
5.INSPECT SEAT CLIMATE CONTROLLER LH (FRONT SEATBACK)
a. Measure the resistance between the terminals.
Tester ConnectionConditionSpecified Condition
1 (TCS) - 2 (TC5)Controller temperature 10°C (50°F)3.6 to 3.8 kohms
1 (TCS) - 2 (TC5)Controller temperature 25°C (77°F)1.9 to 2.1 kohms
1 (TCS) - 2 (TC5)Controller temperature 30°C (86°F)1.6 to 1.7 kohms

Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
If the result is not as specified, replace the controller.
b. Measure the thermistor resistance between the terminals.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
HINT:
As the temperature increases, the resistance decreases.
If the result is not as specified, replace the controller.
Tester ConnectionSpecified Condition
4 (TDB-) - 5 (TDB+)Below 1 ohms
Tester ConnectionConditionSpecified Condition
2 (TBS) - 3 (TB5)Controller temperature 10°C (50°F)3.6 to 3.8 kohms
2 (TBS) - 3 (TB5)Controller temperature 25°C (77°F)1.9 to 2.1 kohms
2 (TBS) - 3 (TB5)Controller temperature 30°C (86°F)1.6 to 1.7 kohms

Fig. 81: Identifying Seat Climate Controller LH Connector Terminals (Front Seatback)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
6.INSPECT SEAT CLIMATE CONTROLLER RH (FRONT SEATBACK)
a. Measure the resistance between the terminals.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
If the result is not as specified, replace the controller.
Tester ConnectionSpecified Condition
4 (TDB-) - 5 (TDB+)Below 1 ohms

Fig. 82: Identifying Seat Climate Controller RH Connector Terminals (Front Seatback)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Measure the thermistor resistance between the terminals.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
HINT:
As the temperature increases, the resistance decreases.
Tester ConnectionConditionSpecified Condition
2 (TBS) - 3 (TB5)Controller temperature 10°C (50°F)3.6 to 3.8 kohms
2 (TBS) - 3 (TB5)Controller temperature 25°C (77°F)1.9 to 2.1 kohms
2 (TBS) - 3 (TB5)Controller temperature 30°C (86°F)1.6 to 1.7 kohms