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Wiper Switch: Inspection: Inspection

  1. INSPECT WINDSHIELD WIPER SWITCH ASSEMBLY 
    1. Check the front wiper switch.
      Fig 1: Identifying Front Washer Switch Connector Terminals
      GTY246567Courtesy 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
        E14-1 (+S) - E14-3 (+1) INT Below 1 Ω
        OFF
        E14-2 (+B) - E14-3 (+1) MIST
        LO
        E14-2 (+B) - E14-4 (+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
        E13-2 (EW) - E13-3 (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 (w/o Intermittent timing adjustment).
      1. Connect a voltmeter's positive (+) lead to terminal E14-3 (+1) and the negative (-) lead to terminal E13-2 (EW).
      2. Connect a battery positive (+) lead to terminal E14-2 (+B) and the negative (-) lead to terminals E13-2 (EW) and E14-1 (+S).
      3. Turn the wiper switch to the INT position.
      4. Connect a battery positive (+) lead to terminal E14-1 (+S) for 5 seconds.
      5. Connect a battery negative (-) lead to terminal E14-1 (+S). Operate the intermittent wiper relay and check the voltage between terminals E14-3 (+1) and E13-2 (EW).

        OK

        Voltage changes as shown in the illustration below.

        Fig 2: Front Washer Switch Connector Terminals Voltage Graph (w/o Intermittent Timing Adjustment)
        GTY245855Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    4. Check the intermittent operation (w/ Intermittent timing adjustment).
      1. Connect a voltmeter's positive (+) lead to terminal E14-3 (+1) and the negative (-) lead to terminal E13-2 (EW).
      2. Connect a battery positive (+) lead to terminal E14-2 (+B) and the negative (-) lead to terminals E13-2 (EW) and E14-1 (+S).
      3. Turn the wiper switch to the INT position.
      4. Connect a battery positive (+) lead to terminal E14-1 (+S) for 5 seconds.
      5. Connect a battery negative (-) lead to terminal E14-1 (+S). Operate the intermittent wiper relay and check the voltage between terminals E14-3 (+1) and E13-2 (EW).

        OK

        Voltage changes as shown in the illustration below.

        Fig 3: Front Washer Switch Connector Terminals Voltage Graph (w/ Intermittent Timing Adjustment)
        GTY245805Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    5. Check the front washer operation.
      1. Turn the wiper switch OFF.
      2. Connect a battery positive (+) lead to terminal E14-2 (+B) and a negative (-) lead to terminals E14-1 (+S) and E13-2 (EW).
      3. Connect a voltmeter's positive (+) lead to E14-3 (+1) and a negative (-) lead to terminal E13-2 (EW).
      4. Turn the washer switch ON and OFF, and check the voltage between terminals E14-3 (+1) and E13-2 (EW).

        OK

        Voltage changes as shown in the illustration below.

        Fig 4: Front Washer Switch Connector Terminals Voltage Graph
        GTY220717Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    6. Check the rear wiper switch.
      Fig 5: Checking Rear Washer Switch Connector Terminals
      GTY246568Courtesy 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
        E13-2 (EW) - E13-6 (C1R) LO Below 1 Ω
        E13-2 (EW) - E13-7 (+1R) HI
        E13-2 (EW) - E13-6 (C1R) OFF 10 kΩ or higher
        E13-2 (EW) - E13-7 (+1R)

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

    7. 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
        E13-2 (EW) - E14-5 (WR) WASHER Below 1 Ω
        E13-2 (EW) - E14-5 (WR) ON + WASHER
        E13-2 (EW) - E13-7 (+1R)
        E13-2 (EW) - E14-5 (WR) OFF 10 kΩ or higher
        E13-2 (EW) - E13-7 (+1R)

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

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