2003 LEXUS LS430 Diagram AC

Fig. 62: Identifying C17 Connector Terminals (2 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (CLEARANCE WARNING ECU
ASSY - BODY GROUND)
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE
CIRCUIT DESCRIPTION
Turning this switch on activates the clearance sonar system.
WIRING DIAGRAM
Tester connection (Symbols)ConditionSpecified condition
C17-7 (MGND) - Body groundAlwaysBelow 1 ohms

Fig. 63: Clearance Sonar Main Switch Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.READ VALUE OF 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 below in the DATA LIST, and read its value displayed on the hand-held tester to
check the clearance sonar main switch.
CSONAR:

Fig. 67: Identifying Outer Mirror Switch Assy Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE OUTER MIRROR SWITCH ASSY
OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (CLEARANCE WARNING ECU
ASSY - BATTERY)
CIRCUIT DESCRIPTION
The clearance warning ECU assy receives the ultrasonic sensor signal to sound the clearance warning buzzer.
WIRING DIAGRAM

Fig. 68: Clearance Warning Buzzer No.1 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 "FRONT BUZZER" in the ACTIVE TEST, and perform it using the hand-held
tester.
f. Check that the clearance warning buzzer No.1 sounds when the ACTIVE TEST is carried out.
OK: Clearance warning buzzer No.1 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.1)
a. Disconnect the C17 connector from the clearance warning ECU assy.
b. Disconnect the C9 connector from clearance warning buzzer No.1.

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.

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

Fig. 15: Climate Control Switch Blinking Patterns
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
HINT:
After identifying the blinking pattern, troubleshoot according to the flow chart below.
Fig. 16: Diagnostic Trouble Code Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
CIRCUIT DESCRIPTION
As a result of a short circuit, overcurrent may occur in the Peltier element of the seat climate controller, fan
motor or rear seat heater. If this happens, output from the Peltier element, fan motor, rear seat heater and idle-up
signal (not including the front passenger side) will be stopped and the indicator illuminates according to
blinking pattern 1.
WIRING DIAGRAM