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Wiper and Washer Switch Circuit: Procedure

  1. CHECK VEHICLE CONDITION 
    1. Check whether the rear wiper and washer systems operate normally.

      Result

      Condition Proceed to
      Rear wiper and washer systems do not operate. A
      Rear wiper system does not operate. B
      Rear washer system does not operate. C

    B → See step   5 

    C → See step   7 

    A: Go to next step 

  2. INSPECT WINDSHIELD WIPER SWITCH ASSEMBLY 
    1. Remove the windshield wiper switch assembly.
      Fig 1: Identifying Windshield Wiper Switch Connector Terminals
      GTY206173Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Inspect the rear wiper switch.
      1. Measure the resistance.

        Standard resistance

        Tester Connection Switch Condition Specified Condition
        2 (E) - 13 (C1R) - 10 (+1R) OFF 10 kΩ or higher
        2 (E) - 13 (C1R) LO Below 1 Ω
        2 (E) - 10 (+1R) HI Below 1 Ω
    3. Inspect the rear washer switch.
      1. Measure the resistance.

        Standard resistance

        Tester Connection Switch Condition Specified Condition
        2 (E) - 10 (+1R) - 12 (WR) OFF 10 kΩ or higher
        2 (E) - 12 (WR) ON (Rear wiper switch in OFF position) Below 1 Ω
        2 (E) - 10 (+1R) - 12 (WR) ON (Rear wiper switch in ON position) Below 1 Ω
    4. Reinstall the the windshield wiper switch assembly.

    NG → See step   9 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER SWITCH - BODY GROUND) 
    1. Disconnect the E19 windshield wiper switch connector.
      Fig 2: Identifying E19 Windshield Wiper Switch Connector
      GTY184667Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance.

      Standard resistance

      Tester Connection Condition Specified Condition
      E19-2 - Body ground Always Below 1 Ω
    3. Reconnect the windshield wiper switch connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (BATTERY - MAIN BODY ECU) 
    1. Measure the voltage.
      Fig 3: Identifying Main Body ECU
      GTY197342Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage

      Tester Connection Condition Specified Condition
      1C-2 (SIG) - Body ground Ignition switch OFF Below 1 V
      1C-2 (SIG) - Body ground Ignition switch ON 11 to 14 V

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE MAIN BODY ECU 

  5. INSPECT WINDSHIELD WIPER SWITCH ASSEMBLY 
    1. Remove the windshield wiper switch assembly.
      Fig 4: Identifying Windshield Wiper Switch Connector Terminals
      GTY206174Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance.

      Standard resistance

      Tester Connection Condition Specified Condition
      2 (E) - 13 (C1R) - 10 (+1R) Rear wiper switch OFF 10 kΩ or higher
      2 (E) - 13 (C1R) Rear wiper switch LO Below 1 Ω
      2 (E) - 10 (+1R) Rear wiper switch HI Below 1 Ω
    3. Reinstall the the windshield wiper switch assembly.

    NG → See step   9 

    OK: Go to next step 

  6. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER SWITCH - MAIN BODY ECU, BODY GROUND) 
    1. Disconnect the E8 main body ECU connector.
      Fig 5: E8 Main Body ECU Connector Terminals
      GTY169000Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance.

      Standard resistance

      Tester Connection Condition Specified Condition
      E8-9 (WRIN) - E8-10 (WRLO) - Body ground Rear wiper switch OFF 10 kΩ or higher
      E8-9 (WRIN) - Body ground Rear wiper switch LO Below 1 Ω
      E8-10 (WRLO) - Body ground Rear wiper switch HI Below 1 Ω
    3. Reconnect the main body ECU connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   10 

  7. INSPECT WINDSHIELD WIPER SWITCH ASSEMBLY 
    1. Remove the windshield wiper switch assembly.
      Fig 6: Identifying Windshield Wiper Switch Connector Terminals
      GTY182691Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance.

      Standard resistance

      Tester Connection Condition Specified Condition
      2 (E) - 10 (+1R) - 12 (WR) Rear washer switch OFF 10 kΩ or higher
      2 (E) - 12 (WR) Rear washer switch ON (Rear wiper switch OFF position side) Below 1 Ω
      2 (E) - 10 (+1R) - 12 (WR) Rear washer switch ON (Rear wiper switch ON position side) Below 1 Ω
    3. Reinstall the windshield wiper switch assembly.

    NG → See step   9 

    OK: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER SWITCH - MAIN BODY ECU, BODY GROUND) 
    1. Disconnect the E7 main body ECU connector.
      Fig 7: E7 Main Body ECU Connector Terminals
      GTY196978Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance.

      Standard resistance

      Tester Connection Condition Specified Condition
      E7-1 (RWSW) - Body ground Rear washer switch OFF 10 kΩ or higher
      E7-1 (RWSW) - Body ground Rear washer switch ON (Rear wiper switch in ON position) Below 1 Ω
      E7-1 (RWSW) - Body ground Rear washer switch ON (Rear wiper switch in OFF position) Below 1 Ω
    3. Reconnect the main body ECU connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   10 

  9. REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY. Refer to  REMOVAL 
  10. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE  
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