LEXUS LS430 2003 Factory Repair Manual

Fig. 90: Inspecting Seat Climate Control Blower RH (Rear Seatback)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
k.INSPECT SEAT CLIMATE CONTROLLER LH (REAR SEATBACK)
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. 91: Identifying Seat Climate Controller LH Connector Terminals (Rear Seatback)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
l.INSPECT SEAT CLIMATE CONTROLLER RH (REAR SEATBACK)
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

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.
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5100510048004600570052005500030037004800550050004c[nals (Rear Seatback)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Measure the thermistor resistance between the terminals.
Tester ConnectionConditionSpecified Condition
4 (TDB-) - 5 (TDB+)AlwaysBelow 1 ohms

Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
HINT:
As the temperature increases, the resistance decreases.
If the result is not as specified, replace the controller.
m.INSPECT REAR SEAT CUSHION HEATER ASSY LH
a. Measure the resistance between the terminals of the rear wing outer heater LH.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
If the result is not as specified, replace the rear seat cushion heater ass
y LH.
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
Tester ConnectionConditionSpecified Condition
1 - 220°C (68°F)2.8 to 3.4 ohms

Fig. 93: Identifying Rear Wing Inner Heater RH Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Measure the resistance between the terminals of the rear wing inner heater LH.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
If the result is not as specified, replace the rear seat cushion heater ass
y LH.
Tester ConnectionConditionSpecified Condition
1 - 220°C (68°F)7.2 to 8.8 ohms

Fig. 94: Identifying Rear Wing Inner Heater LH Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
c. Measure the resistance between the terminals of the rear cushion heater LH.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
Tester ConnectionConditionSpecified Condition
A1 - B120°C (68°F)4.2 to 5.1 ohms
C2 - C420°C (68°F)4.2 to 5.1 ohms
A2 - B2AlwaysBelow 1 ohms
C1 - C325°C (77°F)2 kohms

If the result is not as specified, replace the rear seat cushion heater assy LH.

Fig. 95: Identifying Rear Seat Cushion Heater LH Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
n.INSPECT REAR SEATBACK HEATER ASSY LH
a. Measure the resistance between the terminals of the rear seatback heater LH.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
If the result is not as specified, replace the rear seatback heater assy LH.
Fig. 96: Identifying Rear Seatback Heater LH Connector Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
o.INSPECT REAR SEAT CUSHION HEATER ASSY RH
a. Measure the resistance between the terminals of the rear wing outer heater RH.
Tester ConnectionConditionSpecified Condition
A2 - A420°C (68°F)5.4 to 6.6 ohms
S60-4 - A220°C (68°F)5.4 to 6.6 ohms
S60-2 - A420°C (68°F)5.4 to 6.6 ohms
S60-1 - A1AlwaysBelow 1 ohms
S60-3 - A3AlwaysBelow 1 ohms

Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
If the result is not as specified, replace the rear seat cushion heater assy RH.
Fig. 97: Identifying Rear Wing Outer Heater RH Connector Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Measure the resistance between the terminals of the rear wing inner heater RH.
Standard:
Tester ConnectionConditionSpecified Condition
1 - 220°C (68°F)2.8 to 3.4 ohms