2003 LEXUS LS430 climate control

Standard:
Rear LH
TESTER CONNECTION AND SPECIFIED CONDITION - REAR RH
Rear RH
TESTER CONNECTION AND SPECIFIED CONDITION - REAR RH
Fig. 68: Identifying Seat Climate Control Blower Connector Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: Go to step 10
OK: REPLACE SEAT CLIMATE CONTROL BLOWER (CLIMATE CONTROL ECU)
Tester ConnectionConditionSpecified Condition
C27-8 (SW) - Body groundClimate control switch ONBelow 1 ohms
Tester ConnectionConditionSpecified Condition
C29-8 (SW) - Body groundClimate control switch ONBelow 1 ohms

Fig. 69: Identifying LC Luggage Room J/B Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: Go to step 6
OK: REPAIR OR REPLACE HARNESS AND CONNECTOR (LUGGAGE ROOM J/B ASSY -
CLIMATE CONTROL BLOWER (CLIMATE CONTROL ECU))
6.CHECK WIRE HARNESS (LUGGAGE ROOM J/B ASSY - BATTERY)
a. Disconnect the LL J/B connector.
b. Measure the voltage of the wire harness side connector.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
Tester ConnectionSpecified Condition
LL-1 - Body ground10 to 14 V

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. 75: Identifying Climate Control Switch Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
OK: Go to next step
12.CHECK WIRE HARNESS (SEAT CLIMATE CONTROL BLOWER (CLIMATE CONTROL
ECU) - CLIMATE CONTROL SWITCH)
a. Disconnect the C27 or C29 blower connector.
b. Disconnect the C31 switch connector.
c. Measure the resistance of the wire harness side connectors.
Standard:

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)
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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