2003 LEXUS LS430 air condition

Fig. 55: Disconnecting Television Camera ECU Connector (T24)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Reconnect the television camera ECU connector (T24).
b. Disconnect the television camera ECU connector (T25).
c. Measure the resistance according to the value (s) in the table below.
d. Measure the voltage according to the value (s) in the table below.
Standard:
TELEVISION CAMERA ECU CONNECTOR TERMINALS RESISTANCE AND VOLTAGE
NG: REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR
OK: REPLACE TELEVISION CAMERA ECU (SEE REPLACEMENT
)
Tester ConnectionConditionSpecified Condition
T25-8 (GND1) - Body groundAlwaysBelow 1 ohms
T25-1 (+B) - Body groundAlways10 to 14 V
T25-2 (IG) - Body groundIgnition Switch ON10 to 14 V
T25-5 (ACC) - Body groundIgnition Switch ACC10 to 14 V

Fig. 57: Wiring Diagram - ECM Communication Stop Mode
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.CHECK CAN BUS LINE FOR DISCONNECTION (ECM SUB BUS LINE)
Fig. 58: Disconnecting ECM Connector (E3)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Turn the ignition switch to the LOCK position.
b. Disconnect the ECM connector (E3).
c. Measure the resistance according to the value (s) in the table below.
Standard:
ECM CONNECTOR TERMINALS RESISTANCE
NG: REPAIR OR REPLACE ECM SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L)
Tester connectionConditionSpecified value
E3-25 (CANH) - E3-24 (CANL)Ignition Switch OFF54 to 69 ohms

OK: GO TO NEXT STEP
2.CHECK WIRE HARNESS (+B1, +B, E1)
Fig. 59: Disconnecting ECM Connector (E6)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Disconnect the ECM connector (E6).
b. Measure the resistance according to the value (s) in the table below.
c. Measure the voltage according to the value (s) in the table below.
Standard:
ECM CONNECTOR TERMINALS RESISTANCE AND VOLTAGE
NG: REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR
Tester ConnectionConditionSpecified Condition
E6-7 (E1) - Body groundAlwaysBelow 1 ohms
E3-5 (+B1) - Body groundIgnition Switch ON10 to 14 V
E3-6 (+B) - Body groundIgnition Switch ON10 to 14 V

Fig. 62: Disconnecting Gateway ECU Connector (G3)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Turn the ignition switch to the LOCK position.
b. Disconnect the gateway ECU connector (G3).
c. Measure the resistance according to the value (s) in the table below.
Standard:
GATEWAY ECU CONNECTOR TERMINALS RESISTANCE
NG: REPAIR OR REPLACE GATEWAY ECU SUB BUS LINE OR CONNECTOR (CAN-H,
CAN-L)
OK: GO TO NEXT STEP
2.CHECK WIRE HARNESS (BATT, ACC, IG, CG, GND)
Tester connectionConditionSpecified value
G3-17 (CA1H) - G3-18 (CA1L)Ignition Switch OFF54 to 69 ohms

Fig. 63: Disconnecting Gateway ECU Connector (G3)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Measure the resistance according to the value (s) in the table below.
b. Measure the voltage according to the value (s) in the table below.
Standard:
GATEWAY ECU CONNECTOR TERMINALS RESISTANCE AND VOLTAGE
NG: REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR
Tester ConnectionConditionSpecified Condition
G3-9 (CG) - Body groundAlwaysBelow 1 ohms
G3-24 (GND) - Body groundAlwaysBelow 1 ohms
G3-10 (BATT) - Body groundAlways10 to 14 V
G3-2 (ACC) - Body groundIgnition Switch ACC10 to 14 V
G3-1 (IG) - Body groundIgnition Switch ON10 to 14 V

Fig. 66: Disconnecting Suspension Control ECU Connector (A20)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Turn the ignition switch to the LOCK position.
b. Disconnect the suspension control ECU connector (A20).
c. Measure the resistance according to the value (s) in the table below.
Standard:
SUSPENSION CONTROL ECU CONNECTOR TERMINALS RESISTANCE
NG: REPAIR OR REPLACE SUSPENSION CONTROL ECU SUB BUS LINE OR CONNECTOR
(CAN-H, CAN-L)
OK: GO TO NEXT STEP
2.CHECK WIRE HARNESS (B, GND)
Tester connectionConditionSpecified value
A20-7 (CANH) - A20-8 (CANL)Ignition Switch OFF54 to 69 ohms

Fig. 67: Disconnecting Suspension Control ECU Connector (A20)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Measure the resistance according to the value (s) in the table below.
b. Measure the voltage according to the value (s) in the table below.
Standard:
SUSPENSION CONTROL ECU CONNECTOR TERMINALS RESISTANCE AND VOLTAGE
NG: REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR
OK: REPLACE SUSPENSION CONTROL ECU (SEE REPLACEMENT
)
MODE DESCRIPTION
Tester connectionConditionSpecified value
A20-4 (GND) - Body groundAlwaysBelow 1 ohms
A20-1 (B) - Body groundIgnition Switch ON10 to 14 V

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.CHECK CAN BUS LINE FOR DISCONNECTION (SEAT BELT CONTROL ECU SUB BUS
LINE)
Fig. 70: Disconnecting Seat Belt Control ECU Connector (S63)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Turn the ignition switch to the LOCK position.
b. Disconnect the seat belt control ECU connector (S63).
c. Measure the resistance according to the value (s) in the table below.
Standard:
SEAT BELT CONTROL ECU CONNECTOR TERMINALS RESISTANCE
NG: REPAIR OR REPLACE SEAT BELT CONTROL ECU SUB BUS LINE OR CONNECTOR
Tester connectionConditionSpecified value
S63-4 (CANH) - S63-6 (CANL)Ignition Switch OFF54 to 69 ohms