2003 LEXUS LS430 climate control

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

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

If the result is not as specified, replace the controller.
c.INSPECT CLIMATE CONTROL SWITCH LH (REAR)
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
10 (VSL) - 13 (V5L)Switch ON (LH) Max. COOL to Max. WARM0 to 5 kohms
11 (SWL) - 8 (E)ONBelow 1 ohms
11 (SWL) - 8 (E)OFF10 kohms or higher
Measurement ConditionSwitch
ConditionSpecified
Condition
Battery positive (+) --> Terminal 12 (INDL) Battery
negative (-) --> Terminal 8 (E)ON (LH)Illuminates
Measurement ConditionSpecified
Condition
Battery positive (+) --> Terminal 7 (ILL+) Battery negative (-) --> Terminal 8
(E)Illuminates

Fig. 83: Identifying Climate Control Switch LH Connector Terminals (Rear)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
d.INSPECT CLIMATE CONTROL SWITCH RH (REAR)
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
3 (VSR) - 6 (V5R)Switch ON (RH) Max. COOL to Max. WARM0 --> to 5 kohms
4 (SWR) - 8 (E)ONBelow 1 ohms
4 (SWR) - 8 (E)OFF10 kohms or higher
Measurement ConditionSwitch
ConditionSpecified
Condition
Battery positive (+) --> Terminal 12 (INDR) Battery
negative (-) --> Terminal 8 (E)ON (RH)Illuminates
Measurement ConditionSpecified
Condition
Battery positive (+) --> Terminal 7 (ILL+) Battery negative (-) --> Terminal 8
(E)Illuminates

Fig. 84: Identifying Climate Control Switch RH Connector Terminals (Rear)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.