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Filament Inspection

  1. Switch the ignition to ON.
  2. Turn the rear window defroster switch ON.
    CAUTION:
    • Directly touching the rear window defroster filament with the lead of the tester could damage it. Wrap aluminum foil around the end of the lead and inspect the filament by touching it with the foil.
  3. Connect the positive lead of the tester to the positive side of each filament and the negative lead to ground.
    Fig 1: Inspecting Filament Using Lead Of Voltmeter
    G06941918Courtesy of MAZDA MOTORS CORP.
  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 filament has a malfunction. Repair the filament.
    POWER OUTER MIRROR OPERATION REFERENCE CHART

    Measured part Voltage (Reference)
    (1) to (2) Approx. 11 V to 0 V
    Fig 2: Connecting Positive Lead Of Tester To Filament Positive Side And Negative Lead To Ground
    G04861061Courtesy of MAZDA MOTORS CORP.
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