WIPER AND WASHER SYSTEM > Wiper and Washer Switch Circuit

for Preparation Click here


DESCRIPTION

This circuit detects the state of the windshield wiper switch assembly (front wiper switch and front washer switch) and sends it to the windshield wiper relay assembly.

WIRING DIAGRAM


E168181E14


INSPECTION PROCEDURE

1.INSPECT WINDSHIELD WIPER SWITCH ASSEMBLY


    E171721E25

  1. LHD, RHD Light Control Switch LH Side Type:

    1. Remove the windshield wiper switch assembly (Click here).

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance:
      Front Wiper Switch 
      Tester Connection
      		Switch Condition
      		Specified Condition
      H27-3 (+1) - H27-1 (+S)
      		OFF
      		Below 1 Ω
      H27-3 (+1) - H27-2 (+B)
      		MIST
      LO
      H27-2 (+B) - H27-4 (+2)
      		HI
      H27-9 (AUTO) - H27-10 (E)
      		AUTO
      Front Washer Switch 
      Tester Connection
      		Switch Condition
      		Specified Condition
      H28-2 (EW) - H28-3 (WF)
      		ON
      		Below 1 Ω
      OFF
      		10 kΩ or higher
      Adjusting Ring*1 
      Tester Connection
      		Condition
      		Specified Condition
      H27-7 (VR1) - H27-8 (VR2)
      		 Adjusting ring changed from (+) side to (-) side
      		0 to 2.7 kΩ

      Text in Illustration 
      *a
      		Component without harness connected
      (to Windshield Wiper Switch Assembly)

      HINT:
      *1: The rain sensor sensitivity can be adjusted by the windshield wiper switch adjusting ring.



    E169424E22

  1. RHD Light Control Switch RH Side Type:

    1. Remove the windshield wiper switch assembly (Click here).

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance:
      Front Wiper Switch 
      Tester Connection
      		Switch Condition
      		Specified Condition
      H27-2 (+1) - H27-4 (+S)
      		OFF
      		Below 1 Ω
      H27-2 (+1) - H27-3 (+B)
      		MIST
      LO
      H27-3 (+B) - H27-1 (+2)
      		HI
      H27-6 (AUTO) - H27-5 (E)
      		AUTO
      Front Washer Switch 
      Tester Connection
      		Switch Condition
      		Specified Condition
      H28-2 (EW) - H28-1 (WF)
      		ON
      		Below 1 Ω
      OFF
      		10 kΩ or higher
      Adjusting Ring*1 
      Tester Connection
      		Condition
      		Specified Condition
      H27-8 (VR1) - H27-7 (VR2)
      		 Adjusting ring changed from (+) side to (-) side
      		0 to 2.7 kΩ

      Text in Illustration 
      *a
      		Component without harness connected
      (to Windshield Wiper Switch Assembly)

      HINT:
      *1: The rain sensor sensitivity can be adjusted by the windshield wiper switch adjusting ring.



NG
REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY (Click here)
OK


2.CHECK HARNESS AND CONNECTOR (WIPER SWITCH - WIPER RELAY AND BODY GROUND)

  1. LHD, RHD Light Control Switch LH Side Type:

    1. Disconnect the H28 and H27 windshield wiper switch assembly connectors.

    2. Disconnect the H75 windshield wiper relay assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance:
      Tester Connection
      		Condition
      		Specified Condition
      H27-2 (+B) - H75-12 (IG)
      		Always
      		Below 1 Ω
      H27-2 (+B) - Body ground
      		Always
      		10 kΩ or higher
      H27-3 (+1) - H75-1 (+2S)
      		Always
      		Below 1 Ω
      H27-3 (+1) - Body ground
      		Always
      		10 kΩ or higher
      H27-4 (+2) - H75-3 (+2)
      		Always
      		Below 1 Ω
      H27-4 (+2) - Body ground
      		Always
      		10 kΩ or higher
      H27-1 (+S) - H75-11 (+SSW)
      		Always
      		Below 1 Ω
      H27-1 (+S) - Body ground
      		Always
      		10 kΩ or higher
      H27-9 (AUTO) - H75-17 (C1)
      		Always
      		Below 1 Ω
      H27-9 (AUTO) - Body ground
      		Always
      		10 kΩ or higher
      H27-10 (E) - H75-16 (CO)
      		Always
      		Below 1 Ω
      H27-10 (E) - Body ground
      		Always
      		10 kΩ or higher
      H27-7 (VR1) - H75-7 (VR1)
      		Always
      		Below 1 Ω
      H27-7 (VR1) - Body ground
      		Always
      		10 kΩ or higher
      H27-8 (VR2) - H75-6 (VR2)
      		Always
      		Below 1 Ω
      H27-8 (VR2) - Body ground
      		Always
      		10 kΩ or higher
      H28-3 (WF) - H75-4 (W)
      		Always
      		Below 1 Ω
      H28-3 (WF) - Body ground
      		Always
      		10 kΩ or higher
      H28-2 (EW) - Body ground
      		Always
      		Below 1 Ω

  1. RHD Light Control Switch RH Side Type:

    1. Disconnect the H28 and H27 windshield wiper switch assembly connectors.

    2. Disconnect the H75 windshield wiper relay assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance:
      Tester Connection
      		Condition
      		Specified Condition
      H27-3 (+B) - H75-12 (IG)
      		Always
      		Below 1 Ω
      H27-3 (+B) - Body ground
      		Always
      		10 kΩ or higher
      H27-2 (+1) - H75-1 (+2S)
      		Always
      		Below 1 Ω
      H27-2 (+1) - Body ground
      		Always
      		10 kΩ or higher
      H27-1 (+2) - H75-3 (+2)
      		Always
      		Below 1 Ω
      H27-1 (+2) - Body ground
      		Always
      		10 kΩ or higher
      H27-4 (+S) - H75-11 (+SSW)
      		Always
      		Below 1 Ω
      H27-4 (+S) - Body ground
      		Always
      		10 kΩ or higher
      H27-6 (AUTO) - H75-17 (C1)
      		Always
      		Below 1 Ω
      H27-6 (AUTO) - Body ground
      		Always
      		10 kΩ or higher
      H27-5 (E) - H75-16 (CO)
      		Always
      		Below 1 Ω
      H27-5 (E) - Body ground
      		Always
      		10 kΩ or higher
      H27-8 (VR1) - H75-7 (VR1)
      		Always
      		Below 1 Ω
      H27-8 (VR1) - Body ground
      		Always
      		10 kΩ or higher
      H27-7 (VR2) - H75-6 (VR2)
      		Always
      		Below 1 Ω
      H27-7 (VR2) - Body ground
      		Always
      		10 kΩ or higher
      H28-1 (WF) - H75-4 (W)
      		Always
      		Below 1 Ω
      H28-1 (WF) - Body ground
      		Always
      		10 kΩ or higher
      H28-2 (EW) - Body ground
      		Always
      		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)