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

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


Object Number: 592692  Size: FS
Stationary Windows Components
Rear Window Defogger Circuit Description
Mirrors Fuse, Heated Mirrors, Heated Mirror Relay
G200 (1 of 4)
BRAKE and HTR-A/C Fuses
BRAKE and HTR-A/C Fuses
FRONT HEATED SEATS, REAR HEATED SEATS, HTD MIR, AUX FAN, and RR DEFOG Fuses
G200 (4 of 4)
Mirrors Fuse, Heated Mirrors, Heated Mirror Relay
G400
Figure 2:

Mirrors Fuse, Heated Mirrors, Heated Mirror Relay


Object Number: 592695  Size: FS
Stationary Windows Components
Rear Window Defogger Circuit Description
Rear Defogger, HVAC Control Module, Window Defogger Grid, G400 andG200
Rear Defogger, HVAC Control Module, Window Defogger Grid, G400 andG200
G202 (2 of 4)
FRONT HEATED SEATS, REAR HEATED SEATS, HTD MIR, AUX FAN, and RR DEFOG Fuses