WIPER AND WASHER SYSTEM Wiper and Washer Switch Circuit

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

CAUTION / NOTICE / HINT

PROCEDURE

1. INSPECT WINDSHIELD WIPER SWITCH ASSEMBLY

   
   
   1. 

      Text in Illustration

      *1	Windshield Wiper Switch Assembly (Adjusting Lever Position)
      *a	Component without harness connected (Windshield Wiper Switch Assembly)

      for LHD:

      
      

      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 Condition Specified Condition H25-3 (+1) - H25-1 (+S) OFF Below 1 Ω AUTO H25-3 (+1) - H25-2 (+B) MIST LO H25-2 (+B) - H25-4 (+2) HI H25-8 (AUTO) - H25-9 (E) AUTO
         Front Washer Switch Tester Connection Condition Specified Condition H24-4 (EW) - H24-7 (WF) ON Below 1 Ω OFF 10 kΩ or higher
         Adjusting Lever* Tester Connection Condition Specified Condition H25-7 (VR1) - H25-6 (VR2) P1 209 to 231 Ω P2 114 to 126 Ω P3 58.9 to 65.1 Ω P4 Below 1 Ω

         Tech Tips

         *: The rain sensor sensitivity can be adjusted by the windshield wiper switch assembly adjusting lever.

   2. 

      Text in Illustration

      *1	Windshield Wiper Switch Assembly (Adjusting Lever Position)
      *a	Component without harness connected (Windshield Wiper Switch Assembly)

      for RHD:

      
      

      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 Condition Specified Condition H25-2 (+1) - H25-4 (+S) OFF Below 1 Ω AUTO H25-2 (+1) - H25-3 (+B) MIST LO H25-3 (+B) - H25-1 (+2) HI H25-7 (AUTO) - H25-6 (E) AUTO
         Front Washer Switch Tester Connection Condition Specified Condition H24-7 (EW) - H24-4 (WF) ON Below 1 Ω OFF 10 kΩ or higher
         Adjusting Lever* Tester Connection Condition Specified Condition H25-9 (VR1) - H25-8 (VR2) P1 209 to 231 Ω P2 114 to 126 Ω P3 58.9 to 65.1 Ω P4 Below 1 Ω

         Tech Tips

         *: The rain sensor sensitivity can be adjusted by the windshield wiper switch assembly adjusting lever.

   
   

   NG

   REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY Click here

   OK

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

   
   

   1. Disconnect the H51 windshield wiper relay assembly connector.

   2. Disconnect the A25 windshield wiper motor assembly.

   3. Disconnect the A45 windshield washer motor and pump assembly.

   4. Disconnect the 3D instrument panel junction block assembly.

   5. Disconnect the 3A instrument panel junction block assembly.

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

      Standard Resistance
      for LHD Tester Connection Condition Specified Condition H24-4 (EW) - Body ground Always Below 1 Ω H24-7 (WF) - H51-25 (W) Always Below 1 Ω H24-7 (WF) - A45-2 Always Below 1 Ω H24-7 (WF) - Body ground Always 10 kΩ or higher H25-1 (+S) - H51-10 (+1) Always Below 1 Ω H25-1 (+S) - Body ground Always 10 kΩ or higher H25-2 (+B) - 3A-11 Always Below 1 Ω H25-2 (+B) - Body ground Always 10 kΩ or higher H25-3 (+1) - A25-5 (+1) Always Below 1 Ω H25-3 (+1) - Body ground Always 10 kΩ or higher H25-4 (+2) - H51-11 (+2) Always Below 1 Ω H25-4 (+2) - A25-3 (+2) Always Below 1 Ω H25-4 (+2) - Body ground Always 10 kΩ or higher H25-6 (VR2) - H51-8 (VR2) Always Below 1 Ω H25-6 (VR2) - Body ground Always 10 kΩ or higher H25-7 (VR1) - H51-21 (VR1) Always Below 1 Ω H25-7 (VR1) - Body ground Always 10 kΩ or higher H25-8 (AUTO) - H51-3 (C1) Always Below 1 Ω H25-8 (AUTO) - Body ground Always 10 kΩ or higher H25-9 (E) - H51-5 (CO) Always Below 1 Ω H25-9 (E) - Body ground Always 10 kΩ or higher A45-1 - 3D-4 Always Below 1 Ω A45-1 - Body ground Always 10 kΩ or higher
      for RHD Tester Connection Condition Specified Condition H24-7 (EW) - Body ground Always Below 1 Ω H24-4 (WF) - H51-25 (W) Always Below 1 Ω H24-4 (WF) - A45-2 Always Below 1 Ω H24-4 (WF) - Body ground Always 10 kΩ or higher H25-4 (+S) - H51-10 (+1) Always Below 1 Ω H25-4 (+S) - Body ground Always 10 kΩ or higher H25-3 (+B) - 3A-11 Always Below 1 Ω H25-3 (+B) - Body ground Always 10 kΩ or higher H25-2 (+1) - A25-1 (+1) Always Below 1 Ω H25-2 (+1) - Body ground Always 10 kΩ or higher H25-1(+2) - H51-11 (+2) Always Below 1 Ω H25-1 (+2) - A25-4 (+2) Always Below 1 Ω H25-1 (+2) - Body ground Always 10 kΩ or higher H25-8 (VR2) - H51-8 (VR2) Always Below 1 Ω H25-8 (VR2) - Body ground Always 10 kΩ or higher H25-9 (VR1) - H51-21 (VR1) Always Below 1 Ω H25-9 (VR1) - Body ground Always 10 kΩ or higher H25-7 (AUTO) - H51-3 (C1) Always Below 1 Ω H25-7 (AUTO) - Body ground Always 10 kΩ or higher H25-6 (E) - H51-5 (CO) Always Below 1 Ω H25-6 (E) - Body ground Always 10 kΩ or higher A45-1 - 3D-4 Always Below 1 Ω A45-1 - Body ground Always 10 kΩ or higher

   
   

   OK

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

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR