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Home >> Mazda >> 1997 >> 626 DX L4-2.0L DOHC >> Repair and Diagnosis >> Windows and Glass >> Rear Defogger >> Testing and Inspection >> Filament Inspection
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Filament Inspection

Inspection





1. Turn the ignition switch to ON.
2. Turn the rear window defroster switch on.
3. Measure the voltage at the rear window defroster connector by using a voltmeter to confirm the positive side and negative side.
4. Connect the positive (+) lead of the voltmeter to the positive side of each filament and the negative (-) lead to a ground.





5. Gradually, slide the positive (+) lead from the positive side to the negative side and measure the voltage. Verify that the voltage decreases accordingly.
6. If the voltage is not as specified or it changes rapidly, the filament is faulty. Repair the filament.
7. Turn the ignition switch to OFF.
8. Turn the rear window defroster switch off.

Ohmmeter Connection:




Reference:





9. Measure the resistance at each section of vertical filament by using an ohmmeter
10. If the resistance is not as specified, repair the filament.

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