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HOMESERVICE MANUALSMAZDA20105 SPORT, 2.3 L, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 286 (GLASS/WINDOWS/MIRRORS)FILAMENT INSPECTION
2010 Mazda 5 Sport, 2.3 L, Standard

Filament Inspection

2010 Mazda 5 Sport, 2.3 L, StandardSECTION Filament Inspection
WARNING: This page is about a different car, the 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
  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 will damage it. Wrap aluminum foil around the end of the lead and test the filament by touching it with the foil.
  3. Connect the positive (+) lead of the voltmeter 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 measure the voltage. Verify that the ohmmeter decreases accordingly.
    • If the voltage is not as specified or it changes rapidly, the filament is faulty. Repair the filament.
    Fig 1: Filament Measurement Point And Voltage Table
    G01931041Courtesy of MAZDA MOTORS CORP.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.