WIPER AND WASHER SYSTEM Front Wiper Motor Circuit

DESCRIPTION

The main body ECU LH (cowl side junction block LH) controls the front wiper motor.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the engine switch on (IG).

   3. Turn the intelligent tester on.

   4. Enter the following menus: Body / Body No. 3 / Active Test.

   5. Check the operation.

      Body No. 3 (Main Body ECU LH)

      Tester Display	Test Part	Control Range	Diagnostic Note
      Wiper Motor Hi	Front wiper motor HI operation	ON/OFF	-
      Wiper Motor Lo	Front wiper motor LO operation	ON/OFF	-

      OK
      Front wiper motor operates.

   
   

   NG

   INSPECT WINDSHIELD WIPER MOTOR ASSEMBLY Click here

   OK

   PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

2. INSPECT WINDSHIELD WIPER MOTOR ASSEMBLY

   
   

   1. Remove the windshield wiper motor assembly Click here.

   2. 

      Check the LO operation (for LHD).

      
      

      1. Connect a positive (+) battery lead to terminal 1 (+1) and a negative (-) lead to terminal 5 (E), and check that the motor operates at low speed (LO).

         OK
         Motor operates at low speed (LO).

   3. Check the HI operation (for LHD).

      
      

      1. Connect a positive (+) battery lead to terminal 4 (+2) and a negative (-) lead to terminal 5 (E), and check that the motor operates at high speed (HI).

         OK
         Motor operates at high speed (HI).

   4. 

      Check the LO operation (for RHD).

      
      

      1. Connect a positive (+) battery lead to terminal 5 (+1) and a negative (-) lead to terminal 4 (E), and check that the motor operates at low speed (LO).

         OK
         Motor operates at low speed (LO).

   5. Check the HI operation (for RHD).

      
      

      1. Connect a positive (+) battery lead to terminal 3 (+2) and a negative (-) lead to terminal 4 (E), and check that the motor operates at high speed (HI).

         OK
         Motor operates at high speed (HI).

   
   

   NG

   REPLACE WINDSHIELD WIPER MOTOR ASSEMBLY Click here

   OK

3. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER MOTOR ASSEMBLY - MAIN BODY ECU LH)

   
   

   1. Disconnect the A19 windshield wiper motor assembly connector.

      

   2. Disconnect the A30 and LK main body ECU LH (cowl side junction block LH) connector.

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

      Standard Resistance
      for LHD Tester Connection Condition Specified Condition LK-9 (WIG) - A19-2 (B) Always Below 1 Ω A30-1 (S/S) - A19-1 (+1) Always Below 1 Ω A30-2 (+2) - A19-4 (+2) Always Below 1 Ω A30-3 (S/M) - A19-3 (+S) Always Below 1 Ω A19-3 (+S) - Body ground Always 10 kΩ or higher A19-2 (B) - Body ground Always 10 kΩ or higher A19-4 (+2) - Body ground Always 10 kΩ or higher A19-5 (E) - Body ground Always Below 1 Ω A19-1 (+1) - Body ground Always 10 kΩ or higher
      for RHD Tester Connection Condition Specified Condition LK-9 (WIG) - A19-2 (B) Always Below 1 Ω A30-1 (S/S) - A19-5 (+1) Always Below 1 Ω A30-2 (+2) - A19-3 (+2) Always Below 1 Ω A30-3 (S/M) - A19-1 (+S) Always Below 1 Ω A19-1 (+S) - Body ground Always 10 kΩ or higher A19-2 (B) - Body ground Always 10 kΩ or higher A19-3 (+2) - Body ground Always 10 kΩ or higher A19-4 (E) - Body ground Always Below 1 Ω A19-5 (+1) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   REPLACE MAIN BODY ECU LH (COWL SIDE JUNCTION BLOCK LH)