2003 LEXUS LS430 Diagram AC

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: 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)

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
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INSPECTION PROCEDURE
1.CHECK CAN BUS LINE FOR DISCONNECTION (SUSPENSION CONTROL ECU SUB BUS
LINE)

Fig. 68: Problem Symptom Diagnostic Chart
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WIRING DIAGRAM
Fig. 69: Wiring Diagram
- Seat Belt Control ECU Communication Stop Mode

OK: REPLACE SEAT BELT CONTROL ECU
CIRCUIT DESCRIPTION
There may be an open circuit in the CAN main bus line and/or the DLC3 sub bus line when the resistance
between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 69 ohms or more.
Fig. 72: Problem Symptom Diagnostic Chart

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WIRING DIAGRAM