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Home >> Mazda >> 2006 >> MX-5 Miata Base >> Repair and Diagnosis >> Body & Frame >> Windows >> Glass/Windows/Mirrors >> Rear Window Defroster Filament Inspection
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Rear Window Defroster Filament Inspection

  1. Turn the ignition switch to the ON position.
  2. Turn the rear window defroster switch on.
    CAUTION:
    • Directly touching the rear window defroster filament with the lead of the voltmeter could damage it. Wrap aluminum foil around the end of the lead and test the rear window defroster filament by touching it with the foil.
    Fig 1: Touching Rear Window Defroster Filament With Lead Of Voltmeter
    G04323448Courtesy of MAZDA MOTORS CORP.
  3. Connect the positive lead of the tester to the positive side of each rear window defroster filament and the negative lead to ground.
  4. Gradually slide the positive lead from the positive side to the negative side and verify that the voltage decreases accordingly.
    • If the voltage changes rapidly, the rear window defroster filament has a malfunction. Repair the rear window defroster filament.
    REAR WINDOW DEFROSTER FILAMENT VOLTAGE TABLE

    Measured part Voltage (Reference)
    (1) to (2) Approx. 12 V to 0 V
    Fig 2: Connecting Lead Of Tester To Positive Side Of Each Rear Window Defroster Filament & Lead To Ground
    G04323449Courtesy of MAZDA MOTORS CORP.
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