GM Service Manual Online
For 1990-2009 cars only

The rear window defogger system consists of the following components:

    • A tinted glass
        The tinted glass has a number of horizontal ceramic silver compound lines.
    • 2 vertical bus bars
        The bus bars are baked into the inside surface during the glass forming operation.

The feed wire terminal is soldered to the bus bar on the left side. The ground wire terminal is soldered to the bus bar on the right side. This system operates on battery voltage. Heat from the window may not be detected by finger touch. The length of time required in order to remove interior fog from the rear window will very with the following conditions:

    • The vehicle speed
    • The outside window temperature
    • The atmospheric pressure
    • The number of passengers

This system uses a switch with an integral indicator lamp. After 5 to 10 minutes of system operation, an automatic timer will automatically turn off the system. Turn one of the following switches to OFF in order to turn off the system during this operating period:

    • The defogger switch
    • The ignition switch