LEXUS LS430 2003 Factory Repair Manual

Fig. 55: Disconnecting Television Camera ECU Connector (T24)
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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

MODE DESCRIPTION
Fig. 56: Problem Symptom Diagnostic Chart

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WIRING DIAGRAM

Fig. 57: Wiring Diagram - ECM Communication Stop Mode
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INSPECTION PROCEDURE
1.CHECK CAN BUS LINE FOR DISCONNECTION (ECM SUB BUS LINE)
Fig. 58: Disconnecting ECM Connector (E3)

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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)

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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

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

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WIRING DIAGRAM

Fig. 61: Wiring Diagram - Gateway ECU Communication Stop Mode
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INSPECTION PROCEDURE
1.CHECK CAN BUS LINE FOR DISCONNECTION (GATEWAY ECU SUB BUS LINE)

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

OK: REPLACE GATEWAY ECU
MODE DESCRIPTION
Fig. 64: Problem Symptom Diagnostic Chart

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WIRING DIAGRAM

Fig. 65: Wiring Diagram - Suspension Control ECU Communication Stop Mode
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.CHECK CAN BUS LINE FOR DISCONNECTION (SUSPENSION CONTROL ECU SUB BUS
LINE)