GM Service Manual Online
For 1990-2009 cars only
Figure 1:

Rear Defogger, HVAC Control Module, Window Defogger Grid, G400 and G200


Object Number: 493876  Size: FS
Rear Window Defogger Circuit Description
Power Distribution Schematics
Ground Distribution Schematics
Ground Distribution Schematics
Mirrors Fuse, Heated Mirrors, Heated Mirror Relay
Ground Distribution Schematics
Defogger Schematics
Stationary Windows Components
Figure 2:

Mirrors Fuse, Heated Mirrors, Heated Mirror Relay


Object Number: 493878  Size: FS
Stationary Windows Components
Rear Defogger, HVAC Control Module, Window Defogger Grid, G400 andG200
Ground Distribution Schematics
Rear Window Defogger Circuit Description
Rear Defogger, HVAC Control Module, Window Defogger Grid, G400 andG200
Power Distribution Schematics