Heated Glass Element: Description and Operation

CIRCUIT DESCRIPTION
The ETACM (Electrical Time and Alarm Control System Control Module) controls the operation of the rear window defogger and outside mirror defogger through the defogger relay coil control. Battery voltage applied to the coil and contacts of the defogger relay. When the rear window defogger switch is depressed (ON) and the engine is running the defogger relay coil is energized through the ETACM for 20 minutes Battery voltage is supplied to the rear window defogger and outside mirror defogger through the defogger relay contacts.