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

INSPECTION PROCEDURE

PROCEDURE

1. INSPECT WINDSHIELD WIPER SWITCH ASSEMBLY

   
   
   1. 

      Text in Illustration

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

      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

         Tech Tips

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

   2. 

      Text in Illustration

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

      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

         Tech Tips

         *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

   2. 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