LEXUS LS430 2003 Factory Repair Manual

Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
Tester ConnectionConditionSpecified Condition
PA-1 - Body groundAlways10 to 14 V
PE-6 - Body groundIgnition switch ON10 to 14 V

Fig. 62: Identifying PA And PE Passenger Side J/B Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: Go to next step
6.CHECK WIRE HARNESS (PASSENGER SIDE J/B - BODY GROUND)
a. Disconnect the PG J/B connector.
b. Measure the resistance of the wire harness side connector.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
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52005500030037004800550050004c00510044004f0056[

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Tester ConnectionSpecified Condition
PG-8 - Body groundBelow 1 ohms

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
OK: Go to next step
7.INSPECT RELAY (Marking: P-IG1)
a. Remove the P-IG1 relay from the passenger side J/B.
b. Measure the resistance of the relay.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
Fig. 64: Identifying P
-IG1 Relay Terminals And Circuit
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
OK: REPLACE DRIVER SIDE JUNCTION BLOCK
Tester ConnectionSpecified Condition
3 - 510 kohms or higher
3 - 5Below 1 ohms (when battery voltage is applied to terminal 1 and 2)

CIRCUIT DESCRIPTION
If the climate control seat does not operate, the seat climate control blower (climate control ECU), the climate
control switch or the wire harness may have a malfunction.
WIRE DIAGRAM
Fig. 65: Climate Control System Does Not Operate On Rear Side
- Wire Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE

1.INSPECT FUSE (RR S/HTR)
a. Remove the RR S/HTR fuse from the luggage room J/B.
b. Measure the resistance of the relay.
Standard: Below 1 ohms
NG: REPLACE FUSE
OK: Go to next step
2.CHECK WIRE HARNESS (SEAT CLIMATE CONTROL BLOWER (CLIMATE CONTROL
ECU) - BATTERY)
a. Disconnect the C27 or C29 blower connector.
b. Measure the voltage of the wire harness side connector.
Standard:
Rear LH
TESTER CONNECTION AND SPECIFIED CONDITION
Rear RH
TESTER CONNECTION AND SPECIFIED CONDITION - REAR RH
Tester ConnectionConditionSpecified Condition
C27-10 (IG) - Body groundIgnition switch ON10 to 14 V
Tester ConnectionConditionSpecified Condition
C29-10 (IG) - Body groundIgnition switch ON10 to 14 V

Fig. 66: Identifying Seat Climate Control Blower Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: Go to step 5
OK: Go to next step
3.CHECK WIRE HARNESS (SEAT CLIMATE CONTROL BLOWER (CLIMATE CONTROL
ECU) - BODY GROUND)
a. Disconnect the C27 or C29 blower connector.
b. Measure the resistance of the wire harness side connector.
Standard:
Rear LH
TESTER CONNECTION AND SPECIFIED CONDITION - REAR RH
Tester ConnectionSpecified Condition
C27-11 (GND) - Body groundBelow 1 ohms

Rear RH
TESTER CONNECTION AND SPECIFIED CONDITION - REAR RH
Fig. 67: Identifying Seat Climate Control Blower Connector Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
OK: Go to next step
4.CHECK WIRE HARNESS (SEAT CLIMATE CONTROL BLOWER (CLIMATE CONTROL
ECU) - BODY GROUND)
a. Disconnect the C27 or C29 blower connector.
b. Measure the resistance of the wire harness side connector.
Tester ConnectionSpecified Condition
C29-11 (GND) - Body groundBelow 1 ohms

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

5.CHECK WIRE HARNESS (LUGGAGE ROOM J/B ASSY - BODY GROUND)
a. Disconnect the LC J/B connector.
b. Measure the voltage of the J/B connector.
Standard:
Rear LH
TESTER CONNECTION AND SPECIFIED CONDITION - REAR RH
Rear RH
TESTER CONNECTION AND SPECIFIED CONDITION - REAR RH
Tester ConnectionConditionSpecified Condition
LC-3 - Body groundIgnition switch ON10 to 14 V
Tester ConnectionConditionSpecified Condition
LC-4 - Body groundIgnition switch ON10 to 14 V