LEXUS LS430 2003 Factory Repair Manual

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.

e.INSPECT SEAT CLIMATE CONTROL BLOWER LH (REAR SEAT CUSHION)
a. Connect the battery's positive (+) lead to terminals 3 (BCS) and 4 (BFC-), and the negative (-
) lead to terminal 2 (BFC+). Check that the blower fan motor operates smoothly.
If the result is not as specified, replace the blower.
Fig. 85: Inspecting Seat Climate Control Blower LH (Rear Seat Cushion)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
f.INSPECT SEAT CLIMATE CONTROL BLOWER RH (REAR SEAT CUSHION)
a. Connect the battery's positive (+) lead to terminals 3 (BCS) and 4 (BFC-), and the negative (-
) lead to terminal 4 (BFC-). Check that the blower fan motor operates smoothly.
If the result is not as specified, replace the blower.

Fig. 86: Inspecting Seat Climate Control Blower RH (Rear Seat Cushion)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
g.INSPECT SEAT CLIMATE CONTROLLER LH (REAR SEAT CUSHION)
a. Measure the resistance between the terminals when the switch is operated.
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
Tester ConnectionConditionSpecified Condition
4 (TDB-) - 5 (TDB+)AlwaysBelow 1 ohms
Tester ConnectionConditionSpecified Condition

HINT:
As the temperature increases, the resistance decreases.
If the result is not as specified, replace the controller.
Fig. 87: Identifying Seat Climate Controller LH Connector Terminals (Rear Seat Cushion)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
2 (TCS) - 3 (TC5)Controller temperature 10°C (50°F)3.6 to 3.8 kohms
2 (TCS) - 3 (TC5)Controller temperature 25°C (77°F)1.9 to 2.1 kohms
2 (TCS) - 3 (TC5)Controller temperature 30°C (86°F)1.6 to 1.7 kohms

h.INSPECT SEAT CLIMATE CONTROLLER RH (REAR SEAT CUSHION)
a. Measure the resistance between the terminals when the switch is operated.
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 ConnectionConditionSpecified Condition
4 (TDC-) - 5 (TDC+)AlwaysBelow 1 ohms
Tester ConnectionConditionSpecified Condition
2 (TCS) - 3 (TC5)Controller temperature 10°C (50°F)3.6 to 3.8 kohms
2 (TCS) - 3 (TC5)Controller temperature 25°C (77°F)1.9 to 2.1 kohms
2 (TCS) - 3 (TC5)Controller temperature 30°C (86°F)1.6 to 1.7 kohms

Fig. 88: Identifying Seat Climate Controller RH Connector Terminals (Rear Seat Cushion)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
i.INSPECT SEAT CLIMATE CONTROL BLOWER LH (REAR SEATBACK)
a. Connect the battery's positive (+) lead to terminals 3 (BBS) and 4 (BFB-), and the negative (-
) lead to terminal 2 (BFB+). Check that the blower fan motor operates smoothly.
If the result is not as specified, replace the blower.

Fig. 89: Inspecting Seat Climate Control Blower LH (Rear Seatback)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
j.INSPECT SEAT CLIMATE CONTROL BLOWER RH (REAR SEATBACK)
a. Connect the battery's positive (+) lead to terminals 3 (BBS) and 4 (BFB-), and the negative (-
) lead to terminal 2 (BFB+). Check that the blower fan motor operates smoothly.
If the result is not as specified, replace the blower.