Identifying condition LEXUS LS430 2003 Factory Repair Manual

Fig. 74: Identifying Climate Control Switch Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE REAR SEAT HEATER SWITCH
OK: Go to next step
11.CHECK WIRE HARNESS (CLIMATE CONTROL SWITCH - BODY GROUND)
a. Disconnect the C31 switch connector.
b. Measure the resistance of the wire harness side connector.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
4 (SWR) - 8 (E)ONBelow 1 ohms
Tester ConnectionSpecified Condition
C31-8 (E) - Body groundBelow 1 ohms

Fig. 76: Identifying Seat Climate Control Blower Connector Terminals And Climate Control
Switch Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
OK: REPLACE SEAT CLIMATE CONTROL BLOWER (CLIMATE CONTROL ECU)
1.Driver'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
Tester ConnectionConditionSpecified Condition
1 (LV5) - 12 (LVS)Switch ON (LH) Max. COOL to Max. WARM0 to 5 kohms
Measurement ConditionSwitch
ConditionSpecified
Condition
Battery positive (+) --> Terminal 3 (LIND) Battery negative (-)
--> Terminal 6 (E)ON (LH)Illuminates
Specified

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. 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

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

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