2003 LEXUS LS430 Identifying ac

Fig. 280: Identifying DLC3 Connector terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Measure the resistance according to the value (s) in the table below.
Standard:
DLC3 CONNECTOR TERMINALS RESISTANCE
OK: Go to step 32
NG: REPLACE JUNCTION CONNECTOR (P-CAN J/C)
30.CONNECT CONNECTOR
a. Reconnect the distance control ECU sub bus line (J48) to the P-CAN J/C B side (w/o earth
terminal).
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

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

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

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

Fig. 5: Identifying Front And Back Sonar's Detection Ranges
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
f. Check the multi-information display, the multi-display and the buzzer sounding condition when the
front sensor detects an obstacle.
Operation condition:

Fig. 6: Identifying Front Sonar Display
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
g. Check the multi-information display and the buzzer sounding condition when the back sensor
detects an obstacle.
Operation condition:
Back sonar:
CLEARANCE SONAR MAIN SWITCH

Fig. 7: Identifying Back Sonar Display
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
h. Check the multi-information display, the multi-display and the buzzer sounding condition when the
clearance sonar sensor detects an obstacle.
Operation condition:
Front clearance sonar:
CLEARANCE SONAR MAIN SWITCH

Fig. 8: Identifying Clearance Sonar Display
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
2.INITIAL CHECK FUNCTION CHECK
a. Turn the ignition switch to the ON position.
b. Drive the engine at 2,500 RPM or less with the shift lever in any position except N, or at 1,500
RPM or less with the shift lever in the N position.

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