2003 LEXUS LS430 ignition

Fig. 47: Identifying Yaw Rate Sensor Connector
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:
YAW RATE SENSOR CONNECTOR TERMINALS RESISTANCE AND VOLTAGE
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE YAW RATE SENSOR (SEE REPLACEMENT
)
Tester ConnectionConditionSpecified Condition
Y1-1 (GND) - Body groundAlwaysBelow 1 ohms
Y1-5 (IG) - Body groundIgnition Switch ON10 to 14 V

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Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Turn the ignition switch to the LOCK position.
b. Disconnect the distance control ECU connector (D2).
c. Measure the resistance accordin
g to the value (s) in the table below.

Standard:
DISTANCE CONTROL ECU CONNECTOR TERMINALS RESISTANCE
NG: REPAIR OR REPLACE DISTANCE 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
D2-8 (CANH) - D2-9 (CANL)Ignition Switch OFF54 to 69 ohms

DISTANCE CONTROL ECU CONNECTOR TERMINALS RESISTANCE AND VOLTAGE
NG: REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR
OK: REPLACE DISTANCE CONTROL ECU ASSY (SEE REPLACEMENT
)
MODE DESCRIPTION
Fig. 52: Problem Symptom Diagnostic Chart

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WIRING DIAGRAM
Tester ConnectionConditionSpecified Condition
D2-12 (GND) - Body groundAlwaysBelow 1 ohms
D2-1 (+B) - Body groundIgnition Switch ON10 to 14 V

Fig. 54: Disconnecting Television Camera ECU Connector (T24)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Turn the ignition switch to the LOCK position.
b. Disconnect the television camera ECU connector (T24).
c. Measure the resistance according to the value (s) in the table below.
Standard:
TELEVISION CAMERA ECU CONNECTOR TERMINALS RESISTANCE
NG: REPAIR OR REPLACE TELEVISION CAMERA ECU SUB BUS LINE OR CONNECTOR
(CAN-H, CAN-L)
OK: GO TO NEXT STEP
2.CHECK WIRE HARNESS (IG, +B, ACC, GND1)
Tester connectionConditionSpecified value
T24-8 (CANH) - T24-7 (CANL)Ignition Switch OFF54 to 69 ohms

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