Tailgate Window Defogger: Operation
A separate control circuit, connected to the heater control switch, operates the relay and timer. With the control switch on instrument panel and ignition switch "ON", the defogger relay contacts close.
A timer enclosed in the relay case will allow the defogger to operate for about 8 to 12 minutes, depending upon ambient temperature, or until the control switch or ignition switch is turned "OFF". An indicator light on the instrument panel is on when the system is in operation.
NOTE:
The defogger switch and electric tailgate switch are serviced as an assembly.