2003 LEXUS LS430 Diagram AC

Fig. 28: Front Left Center Sensor Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.INSPECT ULTRASONIC SENSOR NO.2
a. Remove ultrasonic sensor No.2.
b. Measure the resistance according to the value (s) in the table below.
TESTER CONNECTION SPECIFIED CONDITION
NG: REPLACE ULTRASONIC SENSOR NO.2 (SEE REPLACEMENT
)
Tester connectionConditionSpecified condition
1-2Always10 +/- 2 kohms

Fig. 30: 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. 31: DTC B2234 Detection Condition And Trouble Area Description Chart

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

Fig. 32: Front Right Center Sensor Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.INSPECT ULTRASONIC SENSOR NO.2
a. Remove ultrasonic sensor No.2.
b. Measure the resistance according to the value (s) in the table below.
TESTER CONNECTION SPECIFIED CONDITION
NG: REPLACE ULTRASONIC SENSOR NO.2 (SEE REPLACEMENT
)
Tester connectionConditionSpecified condition
1-2Always10 +/- 2 kohms

Fig. 34: 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. 35: DTC B2235 Detection Condition And Trouble Area Description Chart

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

Fig. 36: Front Right Sensor Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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. 38: 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. 39: DTC B2236 Detection Condition And Trouble Area Description Chart

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

Fig. 40: Front Right Side Sensor Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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. 42: 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. 43: DTC B2237 Detection Condition And Trouble Area Description Chart

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