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Home >> Mazda >> 2014 >> 3 SV, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 6 (Glass/Windows/Mirrors) >> Filament Inspection
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Filament Inspection

WARNING: This page is about a different car, the 2014 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
  1. Switch the ignition ON (engine off).
  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 aluminum foil.
    Fig 1: Pressing Aluminium Foil Using Lead
    G09076753Courtesy of MAZDA MOTORS CORP.
  3. Connect the positive lead of the tester to the positive side of each 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 filament has a malfunction. Repair the filament.
    Measured part Voltage (Reference)
    (1) to (2) Approx. 11 V to 0 V
    Fig 2: Connecting Positive Lead Of Tester To Positive Side Of Filament And Negative Lead To Ground
    G09076754Courtesy of MAZDA MOTORS CORP.
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