Heated Glass Element: Testing and Inspection

Rear Window Defogger - Filament Check:

1. Attach probe circuit tester (in volt range) to middle portion of
each filament.

Rear Window Defogger - Filament Check:

^ When measuring voltage, wind a piece of tin foil around the top of the negative probe and press the foil against the wire with your finger as shown.

Rear Window Defogger - Filament Check:

2. If a filament is burned out, circuit tester registers 0 or 12 Volts.

Rear Window Defogger - Filament Check:

3. To locate burned out point, move probe to left and right along filament to determine point where tester needle swings abruptly.