2003 LEXUS LS430 replacement

NG: REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR
OK: REPLACE STEERING SENSOR (SEE REPLACEMENT )
MODE DESCRIPTION
Fig. 44: Problem Symptom Diagnostic Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
WIRING DIAGRAM

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

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

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
WIRING DIAGRAM
Tester ConnectionConditionSpecified Condition
D2-12 (GND) - Body groundAlwaysBelow 1 ohms
D2-1 (+B) - Body groundIgnition Switch ON10 to 14 V

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

OK: REPLACE ECM (SEE REPLACEMENT)
MODE DESCRIPTION
Fig. 60: Problem Symptom Diagnostic Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
WIRING DIAGRAM

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

OK: REPLACE SUSPENSION CONTROL ECU (SEE REPLACEMENT )
OK: REPAIR OR REPLACE SUSPENSION CONTROL ECU SUB BUS LINE OR
CONNECTOR (CAN-H, CAN-L)
18.CONNECT CONNECTOR
a. Reconnect the gateway ECU sub bus line connector (J36) to the D-CAN J/C (w/earth terminal).
19.CHECK CAN BUS LINES FOR SHORT CIRCUIT (GATEWAY ECU SUB BUS LINE)
Fig. 103: Identifying DLC3 Connector terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Disconnect the gateway ECU sub bus line connector (G3).
b. Measure the resistance according to the value (s) in the table below.
Standard:
D1-6 (CANH) - D1-14 (CANL)Ignition Switch OFF54 to 69 ohms

b. Measure the resistance according to the value (s) in the table below.
Standard:
DLC3 CONNECTOR TERMINALS RESISTANCE
OK: REPLACE ECM (SEE REPLACEMENT
)
NG: GO TO NEXT STEP
REPAIR OR REPLACE ECM SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L)
22.CONNECT CONNECTOR
a. Reconnect the skid control ECU sub bus line connector (J41) to the D-CAN J/C B side (w/o earth
terminal).
23.CHECK CAN BUS LINES FOR SHORT CIRCUIT (SKID CONTROL ECU SUB BUS LINE)
Tester connectionConditionSpecified value
D1-6 (CANH) - D1-14 (CANL)Ignition Switch OFF54 to 69 ohms