Wiper And Washer System Wiper And Washer Switch Circuit

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE OF INTELLIGENT TESTER

CHECK WINDSHIELD WIPER SWITCH ASSEMBLY (COMBINATION SWITCH ECU)

CHECK WIRE HARNESS (WINDSHIELD WIPER SWITCH ASSEMBLY - BATTERY)

WIPER AND WASHER SYSTEM - Wiper and Washer Switch Circuit


DESCRIPTION

This circuit provides power to operate the windshield wiper switch. The manual operation signals are sent to the cowl side junction block ECU LH.

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Wiper And Washer.Wiper And Washer System.Wiper And Washer System Wiper And Washer Switch Circuit


INSPECTION PROCEDURE

HINT:
Before the procedure, check that the Multiplex Communication System (MPX) DTCs are not output (Click here).
1.READ VALUE OF INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG) and turn the tester's main switch ON.

  1. Select the items below in the Data List, and read the display on the tester.

    Combination switch ECU (Windshield wiper switch assembly):

    Item
    		Measurement ltem / Display (Range)
    		Normal Condition
    		Diagnostic Note
    F WASHER Switch
    		Front washer switch / ON or OFF
    		ON: Front washer switch ON
    OFF: Front washer switch OFF
    		-
    F WIPER MIST Switch
    		Front wiper MIST switch / ON or OFF
    		ON: Front wiper switch in MIST
    OFF: Wiper switch not in MIST
    		-
    F WIPER AUTO Switch
    		Front wiper AUTO switch / ON or OFF
    		ON: Front wiper switch in AUTO
    OFF: Front switch not in AUTO
    		-
    F WIPER HI Switch
    		Front wiper HI switch / ON or OFF
    		ON: Front wiper switch in HI
    OFF: Wiper switch not in HI
    		-
    F WIPER LO Switch
    		Front wiper LO switch / ON or OFF
    		ON: Front wiper switch in LO
    OFF: Wiper switch not in LO
    		-
    F WIPER INT Switch
    		Front wiper INT switch / ON or OFF
    		ON: Front wiper switch in INT
    OFF: Wiper switch not in INT
    		-
    IG Switch SIG
    		Engine switch signal / ON or OFF
    		ON: Engine switch on (IG)
    OFF: Engine switch off
    		-

    Item
    		Front Wiper Volume Position
    Item explanation
    		Wiper volume position
    FR wiper volume "+" position
    		0 degrees
    Switch is turned one notch towards the "-" side from the FR wiper volume "+" position
    		27 degrees
    Switch is turned one notch towards the "+" side from the FR wiper volume "-" position
    		63 degrees
    FR wiper volume "-" position
    		90 degrees
    Inspection area when malfunction occurs
    		Windshield wiper switch assembly (Front wiper volume)


NG
Go to step 2
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

2.CHECK WINDSHIELD WIPER SWITCH ASSEMBLY (COMBINATION SWITCH ECU)


    Lexus Gs430, Gs300. Uzs190 Grs190.Wiper And Washer.Wiper And Washer System.Wiper And Washer System Wiper And Washer Switch Circuit

  1. Disconnect the L22 switch connector.

  1. Measure the voltage of the connector.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    L22-1 (B) - L22-5 (E)
    		Always
    		10 to 14 V
    L22-2 (IG) - L22-5 (E)
    		Engine switch off
    		Below 1 V
    L22-2 (IG) - L22-5 (E)
    		Engine switch on (IG)
    		10 to 14 V


NG
Go to step 3
OK

REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY (COMBINATION SWITCH ECU)

3.CHECK WIRE HARNESS (WINDSHIELD WIPER SWITCH ASSEMBLY - BATTERY)


    Lexus Gs430, Gs300. Uzs190 Grs190.Wiper And Washer.Wiper And Washer System.Wiper And Washer System Wiper And Washer Switch Circuit

  1. Disconnect the L22 switch connector.

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

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    L22-1 (B) - Body ground
    		Always
    		10 to 14 V
    L22-2 (IG) - Body ground
    		Engine switch off
    		Below 1 V
    L22-2 (IG) - Body ground
    		Engine switch on (IG)
    		10 to 14 V


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR (ENGINE SWITCH CIRCUIT OR BATTERY CIRCUIT)
OK

REPAIR OR REPLACE HARNESS AND CONNECTOR (GROUND CIRCUIT)