Wiper And Washer System Headlight Cleaner Switch 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 RH (HDLO SIGNAL)

INSPECT ENGINE ROOM NO. 2 JUNCTION BLOCK (FRONT WINDOW WASHER SIGNAL)

CHECK WIRE HARNESS (HEADLIGHT CLEANER CONTROL RELAY - BATTERY AND BODY GROUND)

INSPECT COWL SIDE JUNCTION BLOCK RH

CHECK WIRE HARNESS (HEADLIGHT CLEANER CONTROL RELAY - COWL SIDE JUNCTION BLOCK RH)

CHECK WIRE HARNESS (HEADLIGHT CLEANER CONTROL RELAY - ENGINE ROOM JUNCTION BLOCK)

INSPECT INTEGRATION CONTROL & PANEL ASSEMBLY (HEADLIGHT CLEANER SWITCH)

WIPER AND WASHER SYSTEM - Headlight Cleaner Switch Circuit


DESCRIPTION

This circuit detects the conditions of the headlight cleaner switch.
The headlight cleaner control relay receives the following signals:
  1. Headlight cleaner switch signal
  2. Headlight operating signal
  3. Daytime running light operating signal
  4. Front washer motor operating signal

WIRING DIAGRAM


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


INSPECTION PROCEDURE

1.CHECK COWL SIDE JUNCTION BLOCK RH (HDLO SIGNAL)


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

  1. Measure the voltage of the connector.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A41-4 (HDLO) - Body ground
    		Engine switch on (IG) and light control switch OFF
    		10 to 14 V
    A41-4 (HDLO) - Body ground
    		Engine switch on (IG) and light control switch in HEAD position
    		Below 1 V


NG
Go to step 4
OK


2.INSPECT ENGINE ROOM NO. 2 JUNCTION BLOCK (FRONT WINDOW WASHER SIGNAL)


  1. Measure the voltage of the connector.


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


    Standard voltage:

    Tester Connection
    		Condition
    		Specified Condition
    2F-8 (FRWA) - Body ground
    		Engine switch on (IG) and front washer is stopped
    		10 to 14 V
    2F-8 (FRWA) - Body ground
    		Engine switch on (IG) and front washer is operated
    		Below 1 V


NG
Go to step 6
OK


3.CHECK WIRE HARNESS (HEADLIGHT CLEANER CONTROL RELAY - BATTERY AND BODY GROUND)


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

  1. Disconnect the A5 headlight cleaner control relay connector.

  1. Measure the resistance of the connector.

    Standard resistance :
    Tester Connection
    		Condition
    		Specified Condition
    A5-2 (H) - Body ground
    		Headlight cleaner switch OFF (not pushed)
    		10 kΩ or higher
    A5-2 (H) - Body ground
    		Headlight cleaner switch ON (pushed)
    		Below 1 Ω


NG
Go to step 7
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

4.INSPECT COWL SIDE JUNCTION BLOCK RH


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

  1. Disconnect the A41 cowl side junction block RH connector.

  1. Measure the voltage of the connector.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A41-4 (HDLO) - Body ground
    		Engine switch off
    		Below 1 V
    A41-4 (HDLO) - Body ground
    		Engine switch on (IG)
    		10 to 14 V


NG
Go to step 5
OK

REPLACE COWL SIDE JUNCTION BLOCK RH

5.CHECK WIRE HARNESS (HEADLIGHT CLEANER CONTROL RELAY - COWL SIDE JUNCTION BLOCK RH)


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

  1. Disconnect the A5 relay connector.

  1. Disconnect the A41 junction block connector.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A5-3 (HDLO) - A41-4 (HDLO)
    		Always
    		Below 1 Ω
    A5-3 (HDLO) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE HEADLIGHT CLEANER CONTROL RELAY

6.CHECK WIRE HARNESS (HEADLIGHT CLEANER CONTROL RELAY - ENGINE ROOM JUNCTION BLOCK)

  1. Disconnect the A5 relay connector.

  1. Disconnect the 2F junction block connector.



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


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


    Standard resistance:

    Tester Connection
    		Condition
    		Specified Condition
    A5-5 (FRWA) - F2-8 (FRWA)
    		Always
    		Below 1 Ω
    A5-5 (FRWA) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE ENGINE ROOM NO. 2 JUNCTION BLOCK (FRONT CONTROLLER)

7.INSPECT INTEGRATION CONTROL & PANEL ASSEMBLY (HEADLIGHT CLEANER SWITCH)


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

  1. Remove the integration control & panel assembly.

  1. Measure the resistance of the connector.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3 - 4
    		Integration control & panel ON (not pushed)
    		10 kΩ or higher
    3 - 4
    		Integration control & panel OFF (pushed)
    		Below 1 Ω


NG
REPLACE INTEGRATION CONTROL & PANEL ASSEMBLY (HEADLIGHT CLEANER SWITCH)
OK

REPAIR OR REPLACE HARNESS AND CONNECTOR