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2007 ACCESSORIES & BODY, CAB Glass/Windows/Mirrors - MX-5 Miata
Fig. 55: Touching Rear Window Defroster Filament With Lead Of Voltmeter
Courtesy 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.
VOLTAGE (REFERENCE)
Measured part
(1) to (2)
Fig. 56: Checking Voltage Drop In Filament
Courtesy of MAZDA MOTORS CORP.
REAR WINDOW DEFROSTER FILAMENT REPAIR
1. Clean the rear window defroster filament using isopropyl alcohol.
2. Attach tape to both sides of the rear window defroster filament.
3. Using a small brush or marking pen, apply silver paint.
4. After 2-3 min, carefully remove the tape without damaging the applied area.
2007 Mazda MX-5 Miata Sport
Voltage (Reference)
Approx. 12 V to 0 V
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Troubleshooting
