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Wiper Switch: Inspection: Inspection

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  1. INSPECT WINDSHIELD WIPER SWITCH ASSEMBLY 
    1. Check the front wiper switch.
      Fig 1: Identifying Windshield Wiper Switch Connector Terminals
      GTY171158Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Measure the resistance according to the value(s) in the table below.

        Standard resistance

        Tester Connection Switch Condition Specified Condition
        D17-1 (+S) - D17-3 (+1) INT Below 1 Ω
        OFF
        D17-2 (+B) - D17-3 (+1) MIST
        LO
        D17-2 (+B) - D17-4 (+2) HI

        If the result is not as specified, replace the switch assembly.

    2. Check the front washer switch.
      1. Measure the resistance according to the value(s) in the table below.

        Standard resistance

        Tester Connection Switch Condition Specified Condition
        D18-2 (EW) - D18-3 (WF) ON Below 1 Ω
        OFF 10 kΩ or higher

        If the result is not as specified, replace the switch assembly.

    3. Check the intermittent operation.
      1. Connect the voltmeter's positive (+) lead to terminal D17-3 (+1) and the negative (-) lead to terminal D18-2 (EW).
      2. Connect the battery's positive (+) lead to terminal D17-2 (+B) and the negative (-) lead to terminal D18-2 (EW) and D17-1 (+S).
      3. Turn the wiper switch to the INT position.
      4. Connect the battery's positive (+) lead to terminal D17-1 (+S) for 5 seconds.
      5. Connect the battery's negative (-) lead to terminal D17-1 (+S). Operate the intermittent wiper relay and check the voltage between terminals D17-3 (+1) and D18-2 (EW).

        OK

        Voltage changes as shown in the illustration below.

        Fig 2: Voltage Between Terminals Graph
        GTY171984Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        If the result is not as specified, replace the switch assembly.

    4. Check the front washer operation.
      1. Turn the wiper switch OFF.
      2. Connect the battery's positive (+) lead to terminal D17-2 (+B) and the negative (-) lead to terminals D17-1 (+S) and D18-2 (EW).
      3. Connect the voltmeter's positive (+) lead to D17-3 (+1) and the negative (-) lead to terminal D18-2 (EW).
      4. Turn the washer switch ON and OFF, and check the voltage between terminals D17-3 (+1) and D18-2 (EW).

        OK

        Voltage changes as shown in the illustration below.

        Fig 3: Voltage Between Terminals Graph
        GTY206591Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        If the result is not as specified, replace the switch assembly.

    5. Check the rear wiper switch.
      Fig 4: Identifying Rear Washer Switch
      GTY171159Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Measure the resistance according to the value(s) in the table below.

        Standard resistance

        Tester Connection Switch Condition Specified Condition
        D18-2 (EW) - D18-6 (C1R) LO Below 1 Ω
        D18-2 (EW) - D18-7 (+1R) HI
        D18-2 (EW) - D18-6 (C1R) OFF 10 kΩ or higher
        D18-2 (EW) - D18-7 (+1R)

        If the result is not as specified, replace the switch assembly.

    6. Check the rear washer switch.
      1. Measure the resistance according to the value(s) in the table below.

        Standard resistance

        Tester Connection Switch Condition Specified Condition
        D18-2 (EW) - D17-5 (WR) ON Below 1 Ω
        OFF 10 kΩ or higher

        If the result is not as specified, replace the switch assembly.

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