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

Rear Window Defogger


Object Number: 1482978  Size: MF
(1)Defogger - Rear
Figure 2:

HVAC Control - Manual


Object Number: 1483264  Size: LF
(1)HVAC Control
(2)Defogger Switch
Figure 3:

HVAC Control - Automatic


Object Number: 1483205  Size: MF
(1)HVAC Control
(2)Defogger Switch