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

1. for LHD

   

2. for RHD

   

INSPECTION PROCEDURE

PROCEDURE

1. INSPECT WINDSHIELD WIPER SWITCH ASSEMBLY

   
   
   1. 

      Text in Illustration

      *1	Windshield Wiper Switch Assembly (Adjusting Ring 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 Switch Condition Specified Condition I32-3 (+1) - I32-1 (+S) OFF Below 1 Ω I32-3 (+1) - I32-2 (+B) MIST LO I32-2 (+B) - I32-4 (+2) HI I32-8 (AUTO) - I32-9 (E) AUTO
         Front Washer Switch Tester Connection Switch Condition Specified Condition I31-4 (EW) - I31-7 (WF) ON Below 1 Ω OFF 10 kΩ or higher
         Adjusting Ring* Tester Connection Switch Condition Specified Condition I32-7 (VR1) - I32-6 (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 adjusting ring.

   2. 

      Text in Illustration

      *1	Windshield Wiper Switch Assembly (Adjusting Ring 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 Switch Condition Specified Condition I32-2 (+1) - I32-4 (+S) OFF Below 1 Ω I32-2 (+1) - I32-3 (+B) MIST LO I32-3 (+B) - I32-1 (+2) HI I32-7 (AUTO) - I32-6 (E) AUTO
         Front Washer Switch Tester Connection Switch Condition Specified Condition I31-7 (EW) - I31-4 (WF) ON Below 1 Ω OFF 10 kΩ or higher
         Adjusting Ring* Tester Connection Switch Condition Specified Condition I32-9 (VR1) - I32-8 (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 adjusting ring.

   
   

   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. for LHD:

      
      

      1. Disconnect the I72 windshield wiper relay assembly connector and B1*1 or A29*2 windshield wiper motor assembly connector.

         
         

         • *1: TMC made

         • *2: TMMR made

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

         Standard Resistance

         Tester Connection Condition Specified Condition I32-2 (+B) - I72-2 (IG) Always Below 1 Ω I32-2 (+B) - Body ground Always 10 kΩ or higher I32-3 (+1) - B1-5 (+1)*1 Always Below 1 Ω I32-3 (+1) - A29-5 (+1)*2 Always Below 1 Ω I32-3 (+1) - Body ground Always 10 kΩ or higher I32-4 (+2) - I72-11 (+2) Always Below 1 Ω I32-4 (+2) - B1-3 (+2)*1 Always Below 1 Ω I32-4 (+2) - A29-3 (+2)*2 Always Below 1 Ω I32-4 (+2) - Body ground Always 10 kΩ or higher I32-1 (+S) - I72-10 (+1) Always Below 1 Ω I32-1 (+S) - Body ground Always 10 kΩ or higher I32-8 (AUTO) - I72-3 (C1) Always Below 1 Ω I32-8 (AUTO) - Body ground Always 10 kΩ or higher I32-9 (E) - I72-5 (CO) Always Below 1 Ω I32-9 (E) - Body ground Always 10 kΩ or higher I32-7 (VR1) - I72-21 (VR1) Always Below 1 Ω I32-7 (VR1) - Body ground Always 10 kΩ or higher I32-6 (VR2) - I72-8 (VR2) Always Below 1 Ω I32-6 (VR2) - Body ground Always 10 kΩ or higher I31-7 (WF) - I72-25 (W) Always Below 1 Ω I31-7 (WF) - Body ground Always 10 kΩ or higher I31-4 (EW) - Body ground Always Below 1 Ω

         
         

         • *1: TMC made

         • *2: TMMR made

   2. for RHD:

      
      

      1. Disconnect the I72 windshield wiper relay assembly connector and B1 windshield wiper motor assembly connector.

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

         Standard Resistance

         Tester Connection Condition Specified Condition I32-3 (+B) - I72-2 (IG) Always Below 1 Ω I32-3 (+B) - Body ground Always 10 kΩ or higher I32-2 (+1) - B1-1 (+1) Always Below 1 Ω I32-2 (+1) - Body ground Always 10 kΩ or higher I32-1 (+2) - I72-11 (+2) Always Below 1 Ω I32-1 (+2) - B1-4 (+2) Always Below 1 Ω I32-1 (+2) - Body ground Always 10 kΩ or higher I32-4 (+S) - I72-10 (+1) Always Below 1 Ω I32-4 (+S) - Body ground Always 10 kΩ or higher I32-7 (AUTO) - I72-3 (C1) Always Below 1 Ω I32-7 (AUTO) - Body ground Always 10 kΩ or higher I32-6 (E) - I72-5 (CO) Always Below 1 Ω I32-6 (E) - Body ground Always 10 kΩ or higher I32-9 (VR1) - I72-21 (VR1) Always Below 1 Ω I32-9 (VR1) - Body ground Always 10 kΩ or higher I32-8 (VR2) - I72-8 (VR2) Always Below 1 Ω I32-8 (VR2) - Body ground Always 10 kΩ or higher I31-4 (WF) - I72-25 (W) Always Below 1 Ω I31-4 (WF) - Body ground Always 10 kΩ or higher I31-7 (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