Defoggers - Rear Window: Operation
The heated rear window system is controlled by the ignition switch and a defogger control switch. Both switches must be positioned "On" to operate system. With switches "On", current is supplied to the relay/timer and to the rear window. Window will heat for approximately 10-15 minutes or until the ignition or control switch is turned to "Off" Position.
NOTE:
Corvette rear window will heat until ignition or control switch is turned to "Off" position.