Filament Inspection

2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Filament Inspection
WARNING: This page is about a different car, the 2004 Mazda 3. 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 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: Wrapping Aluminum Foil At Lead Of Voltmeter For Inspection
    G02566766Courtesy 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.
      FILAMENT INSPECTION

      Measured part Voltage (Reference)
      Point (1) to (2)Β  Approx. 12 V to 0 VΒ 
      Fig 2: Inspecting Voltage Between Filament
      G02566767Courtesy 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:

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