'01 Century rear window defrost

The defogger grid voltage is 12 volts DC (battery). Most GM cars have a RF filter that ties into the defogger circuit that can go bad. The RF filter is used to isolate noise that may be introduced into the radio via the antenna when the defogger is turned on.

The defogger grid voltage is 12 volts DC (battery). Most GM cars have a RF filter that ties into the defogger circuit that can go bad. The RF filter is used to isolate noise that may be introduced into the radio via the antenna when the defogger is turned on.