LEXUS LS430 2003 Factory Repair Manual

b. Measure the resistance of the wire harness side connector.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
Fig. 53: Identifying Seat Climate Control Blower 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)
4.CHECK WIRE HARNESS (DRIVER SIDE J/B - BATTERY)
a. Disconnect the DJ J/B connector.
b. Measure the voltage of the J/B connector.
Tester ConnectionSpecified Condition
C20-8 (E) - Body groundBelow 1 ohms

Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
Fig. 54: Identifying Driver Side J/B Connector Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: Go to step 5
OK: REPAIR OR REPLACE HARNESS AND CONNECTOR (DRIVER SIDE J/B - CLIMATE
CONTROL BLOWER (CLIMATE CONTROL ECU))
5.CHECK WIRE HARNESS (DRIVER SIDE J/B - BATTERY)
a. Disconnect the DA and DF J/B connectors.
Tester ConnectionConditionSpecified Condition
DJ-6 - Body groundIgnition switch ON10 to 14 V

b. Measure the voltage of the wire harness side connectors.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
Tester ConnectionConditionSpecified Condition
DA-1 - Body groundAlways10 to 14 V
DF-4 - Body groundIgnition switch ON10 to 14 V

Fig. 55: Identifying DA And DF Driver 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 (DRIVER SIDE J/B - BODY GROUND)
a. Disconnect the DG J/B connector.
b. Measure the resistance of the wire harness side connector.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
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37004800550050004c00510044004f0056[

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

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
OK: Go to next step
7.INSPECT RELAY (Marking: D-IG1)
a. Remove the D-IG1 relay from the driver side J/B.
b. Measure the resistance of the relay.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
Fig. 57: Identifying D
-IG1 Relay Terminals And Circuit
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE RELAY
OK: REPLACE PASSENGER 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) or the wire
harness may be malfunctioning.
WIRE DIAGRAM
Fig. 58: Climate Control System Does Not Operate On Passenger Side
- Wire Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.INSPECT FUSE (P S/HTR)
a. Remove the P S/HTR fuse from the driver side 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 C21 blower connector.
b. Measure the voltage of the wire harness side connector.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
Tester ConnectionConditionSpecified Condition

Fig. 59: 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
3.CHECK WIRE HARNESS (CLIMATE CONTROL BLOWER (CLIMATE CONTROL ECU) -
BODY GROUND)
a. Disconnect the C21 blower connector.
b. Measure the resistance of the wire harness side connector.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
C21-7 (IG) - Body groundIgnition switch ON10 to 14 V

Fig. 60: Identifying Seat Climate Control Blower 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)
4.CHECK WIRE HARNESS (PASSENGER SIDE J/B - BATTERY)
a. Disconnect the PJ J/B connector.
b. Measure the voltage of the J/B connector.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
Tester ConnectionSpecified Condition
C20-8 (E) - Body groundBelow 1 ohms

Fig. 61: Identifying PJ Passenger Side J/B Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: Go to step 5
OK: REPAIR OR REPLACE HARNESS AND CONNECTOR (PASSENGER SIDE J/B -
CLIMATE CONTROL BLOWER (CLIMATE CONTROL ECU))
5.CHECK WIRE HARNESS (PASSENGER SIDE J/B - BODY GROUND
a. Disconnect the PA and PE J/B connectors.
b. Measure the voltage of the wire harness side connectors.
Tester ConnectionConditionSpecified Condition
PJ-9 - Body groundIgnition switch ON10 to 14 V