2003 LEXUS LS430 Diagram AC

NG: REPAIR OR REPLACE SEAT BELT CONTROL ECU SUB BUS LINE OR CONNECTOR
OK: REPLACE SEAT BELT CONTROL ECU
CIRCUIT DESCRIPTION
There may be a short circuit between the CAN bus line and GND when there is resistance between terminals 6
(CANH) and 4 (CG) or terminals 14 (CANL) and 4 (CG) of the DLC3.
Fig. 253: Problem Symptom Diagnostic Chart

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WIRING DIAGRAM

Fig. 254: Wiring Diagram - CAN Bus Line For Short To GND (W/O LEXUS Navigation System) (1 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 255: Wiring Diagram - CAN Bus Line For Short To GND (W/O LEXUS Navigation System) (2 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.CHECK CAN BUS LINE FOR SHORT TO GND (DLC3 SUB BUS LINE)

Fig. 3: Clearance Sonar System Diagram
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1.GENERAL

WIRING DIAGRAM
Fig. 20: Front Left Side Sensor Wiring Diagram

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INSPECTION PROCEDURE
1.INSPECT ULTRASONIC SENSOR NO.1
a. Remove ultrasonic sensor No.1.
b. Measure the resistance according to the value (s) in the table below.
TESTER CONNECTION SPECIFIED CONDITION
NG: REPLACE ULTRASONIC SENSOR NO.1 (SEE REPLACEMENT
)
Tester connectionConditionSpecified condition
1-2Always10 +/- 2 kohms

Fig. 22: Identifying Clearance Warning ECU Assy Terminals
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NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE CLEARANCE WARNING ECU ASSY (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION
Ultrasonic sensor consists of a sensor portion that transmits and receives ultrasonic waves and a pre-amplifier
that amplifies them. The ultrasonic sensor outputs the ultrasonic transmission and reception signals to the
clearance warning ECU assy.
Fig. 23: DTC B2232 Detection Condition And Trouble Area Description Chart

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WIRING DIAGRAM

Fig. 24: Front Left Sensor Wiring Diagram
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INSPECTION PROCEDURE
1.INSPECT ULTRASONIC SENSOR NO.1
a. Remove ultrasonic sensor No.1.
b. Measure the resistance according to the value (s) in the table below.
TESTER CONNECTION SPECIFIED CONDITION
Fig. 25: Identifying Ultrasonic Sensor No.1 Terminals

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Tester connectionConditionSpecified condition
1-2Always10 +/- 2 kohms

Fig. 26: Identifying Clearance Warning ECU Assy Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE CLEARANCE WARNING ECU ASSY (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION
Ultrasonic sensor consists of a sensor portion that transmits and receives ultrasonic waves and a pre-amplifier
that amplifies them. The ultrasonic sensor outputs the ultrasonic transmission and reception signals to the
clearance warning ECU assy.
Fig. 27: DTC B2233 Detection Condition And Trouble Area Description Chart

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