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Window Defogger Switch: Inspection: Inspection

  1. INSPECT WINDOW DEFOGGER SWITCH 
    1. Check the defogger switch illuminates.
      Fig 1: Identifying Defogger Switch Illumination & Connector Terminals
      GTY217266Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard

      Measurement Condition Specified Condition
      Battery positive (+) → ILL+ (6)
      Battery negative (-) → ILL- (5)      		 Illuminates

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

    2. Check the defogger timer.
      Fig 2: Testing Defogger Timer
      GTY231826Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Connect the positive (+) lead from the battery to terminal 2 and the negative (-) lead to terminal 3.
      2. Connect positive (+) lead from the battery to terminal 1 through a 1.4 W test bulb.
      3. Push the outer defogger switch ON then check that the switch and the test bulb turn off after thy illuminate for 12 to 18 minutes.

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

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