2003 LEXUS LS430 replacement

31.CHECK CAN BUS LINE FOR SHORT TO GND (DISTANCE CONTROL ECU SUB BUS LINE)
Fig. 281: Identifying DLC3 Connector terminals

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a. Disconnect the distance control ECU connector (D2).
b. Measure the resistance according to the value (s) in the table below.
Standard:
DLC3 CONNECTOR TERMINALS RESISTANCE
OK: REPLACE DISTANCE CONTROL ECU ASSY (SEE REPLACEMENT
)
NG: REPAIR OR REPLACE DISTANCE CONTROL ECU SUB BUS LINE OR CONNECTOR
(CAN-H, CAN-L)
Tester connectionConditionSpecified value
D1-6 (CANH) - D1-4 (CG)Ignition Switch OFF1 kohms or more
D1-14 (CANL) - D1-4 (CG)Ignition Switch OFF1 kohms or more

32.CONNECT CONNECTOR
a. Reconnect the yaw rate sensor sub bus line connector (J44) to the P-CAN J/C A side (w/earth
terminal).
33.CHECK CAN BUS LINE FOR SHORT TO GND (YAW RATE SENSOR SUB BUS LINE)
Fig. 282: Identifying DLC3 Connector terminals

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a. Disconnect the yaw rate sensor connector (Y1).
b. Measure the resistance according to the value (s) in the table below.
Standard:
DLC3 CONNECTOR TERMINALS RESISTANCE
OK: REPLACE YAW RATE SENSOR (SEE REPLACEMENT
)
Tester connectionConditionSpecified value
D1-6 (CANH) - D1-4 (CG)Ignition Switch OFF1 kohms or more
D1-14 (CANL) - D1-4 (CG)Ignition Switch OFF1 kohms or more

c. After turning the ignition switch to the ON position, wait for 2 seconds or more, then turn the
clearance sonar main switch on. Check the multi-information display and the buzzer sounding
condition.
Standard:
After the main switch is turned on, the multi-information display shows the Fig. 9
below
for approximatel
y 2 seconds and the buzzer sounds for approximately 1 second then the
detection mode begins.
Fig. 9: Identifying Multi
-Information Display
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HINT:
Multi-information display:
The malfunctioning sensor blinks on the display when the wire harness or the connector is
faulty and requires repair or replacement, or when trouble is detected in the ultrasonic sensor
circuits. After the sensor operation returns to normal, the detection mode will finish
normall
y.

Fig. 10: Identifying Trouble Detection Display
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Multi-display:
The malfunctioning sensor is displayed when the wire harness or the connector is faulty and
requires repair or replacement, or when trouble is detected in the ultrasonic sensor circuits.
After the sensor operation returns to normal, the detection mode will finish normally.
Fig. 11: Identifying Trouble Detection Display (Multi
-Display)

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

NG: REPLACE ULTRASONIC SENSOR NO.1 (SEE REPLACEMENT )
OK: Go To Next Step.
2.CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSY -
ULTRASONIC SENSOR NO. 1)
a. Disconnect the C17 connector from the clearance warning ECU assy.
b. Disconnect the U2 connector from ultrasonic sensor No.1.
c. Measure the resistance according to the value (s) in the table below.
TESTER CONNECTION SPECIFIED CONDITION
Tester connection (Symbols)ConditionSpecified value
C17-13 (FL) - U2-2AlwaysBelow 1 ohms
C17-8 (FGND) - U2-1AlwaysBelow 1 ohms
C17-13 (FL) - Body groundAlways10 kohms or higher
C17-8 (FGND) - Body groundAlways10 kohms or higher

Fig. 26: 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. 27: DTC B2233 Detection Condition And Trouble Area Description Chart

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WIRING DIAGRAM