Wiper And Washer System Wiper Switch (Hi Speed) Circuit

Body Electrical. Lexus Gs430, Gs300. Uzs190 Grs190
Wiper And Washer. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK COWL SIDE JUNCTION BLOCK LH (COWL SIDE JUNCTION BLOCK ECU LH)

CHECK WIRE HARNESS (WINDSHIELD WIPER SWITCH - BATTERY)

INSPECT WINDSHIELD WIPER SWITCH ASSEMBLY (COMBINATION SWITCH)

CHECK WIRE HARNESS (WINDSHIELD WIPER SWITCH ASSEMBLY - COWL SIDE JUNCTION BLOCK LH)

WIPER AND WASHER SYSTEM - Wiper Switch (HI Speed) Circuit


DESCRIPTION

The cowl side junction block ECU LH receives the HI position signal of the wiper switch to operate the wiper motor at HI speed.
Even if the ECU malfunctions, its circuit structure enables it to operate the wiper in HI operation mode.

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Wiper And Washer.Wiper And Washer System.Wiper And Washer System Wiper Switch (Hi Speed) Circuit


INSPECTION PROCEDURE

1.CHECK COWL SIDE JUNCTION BLOCK LH (COWL SIDE JUNCTION BLOCK ECU LH)


    Lexus Gs430, Gs300. Uzs190 Grs190.Wiper And Washer.Wiper And Washer System.Wiper And Washer System Wiper Switch (Hi Speed) Circuit

  1. Measure the voltage of the connector.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    W2-11 (2S) - Body ground
    		Wiper switch not in HI position
    		10 to 14 V
    W2-11 (2S) - Body ground
    		Wiper switch in HI position
    		Below 1 V


NG
Go to step 2
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

2.CHECK WIRE HARNESS (WINDSHIELD WIPER SWITCH - BATTERY)


    Lexus Gs430, Gs300. Uzs190 Grs190.Wiper And Washer.Wiper And Washer System.Wiper And Washer System Wiper Switch (Hi Speed) Circuit

  1. Disconnect the L22 switch connector.

  1. Measure the voltage of the wire harness side connector.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    L22-3 (2S) - Body ground
    		Engine switch on (IG)
    		10 to 14 V


NG
Go to step 4
OK


3.INSPECT WINDSHIELD WIPER SWITCH ASSEMBLY (COMBINATION SWITCH)


    Lexus Gs430, Gs300. Uzs190 Grs190.Wiper And Washer.Wiper And Washer System.Wiper And Washer System Wiper Switch (Hi Speed) Circuit

  1. Measure the resistance of the connector.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    L22-3 (2S) - L22-5 (E)
    		Wiper switch in HI position
    		Below 1 Ω
    L22-3 (2S) - L22-5 (E)
    		Wiper switch in HI HEAD position
    		10 kΩ or higher


NG
REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY
OK

REPAIR OR REPLACE HARNESS AND CONNECTOR (GROUND CIRCUIT)

4.CHECK WIRE HARNESS (WINDSHIELD WIPER SWITCH ASSEMBLY - COWL SIDE JUNCTION BLOCK LH)


    Lexus Gs430, Gs300. Uzs190 Grs190.Wiper And Washer.Wiper And Washer System.Wiper And Washer System Wiper Switch (Hi Speed) Circuit

  1. Disconnect the W2 junction block connector.

  1. Disconnect the L22 switch connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    L22-3 (2S) - W2-11 (2S)
    		Always
    		Below 1 Ω
    W2-11 (2S) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE