LEXUS LS430 2003 Factory Repair Manual

Fig. 69: Identifying Clearance Warning ECU Assy Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go To Next Step.
3.REPLACE CLEARANCE WARNING BUZZER NO.1
a. Replace clearance warning buzzer No.1 with a new one.
b. Check clearance warning buzzer No.1.
Perform ACTIVE TEST following the same procedure as for step 1.
OK: Malfunction disappears (Clearance warning buzzer No.1 sounds).
OK: NORMAL
NG: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE
CIRCUIT DESCRIPTION
The clearance warning ECU assy receives the ultrasonic sensor signal to sound the clearance warning buzzer.
WIRING DIAGRAM

Fig. 70: Clearance Warning Buzzer No.2 Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.PERFORM ACTIVE TEST BY HAND-HELD TESTER
a. Connect the hand-held tester to the DLC3.
b. Turn the ignition switch to the ON position.
c. Turn the hand-held tester on.
d. Turn the clearance sonar main switch on.
e. Select the item "REAR BUZZER" in the ACTIVE TEST, and perform it using the hand-held tester.
f. Check that clearance warning buzzer No.2 sounds when the ACTIVE TEST is carried out.
OK: Clearance warning buzzer No.2 sounds.
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE
NG: Go To Next Step.
2.CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSY - CLEARANCE
WARNING BUZZER NO.2)
a. Disconnect the C17 connector from the clearance warning ECU assy.
b. Disconnect the C16 connector from clearance warning buzzer No.2.

c. Measure the resistance according to the value (s) in the table below.
Standard:
TESTER CONNECTION SPECIFIED CONDITION
Tester connection (Symbols)ConditionSpecified condition
C17-6 (RBZ+) - C16-1AlwaysBelow 1 ohms
C17-6 (RBZ+) - Body groundAlways10 kohms or higher
C17-19 (RBZ) - C16-2AlwaysBelow 1 ohms
C17-19 (RBZ) - Body groundAlways10 kohms or higher

Fig. 71: Identifying Clearance Warning ECU Assy Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go To Next Step.
3.REPLACE CLEARANCE WARNING BUZZER NO.2
a. Replace clearance warning buzzer No.2 with a new one.
b. Check clearance warning buzzer No.2.
Perform ACTIVE TEST following the same procedure as for step 1.
OK: Malfunction disappears (Clearance warning buzzer No.2 sounds).
OK: NORMAL
NG: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE

FRONT POWER SEAT CONTROL SYSTEM INDEX
System NameSee Procedure
Front Power Seat Control SystemINITIALIZATION

Fig. 1: Locating Climate Control Seat System Components (1 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 2: Locating Climate Control Seat System Components (2 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 3: Climate Control Seat System Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.