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

Top of Center Console


Object Number: 588797  Size: LF
(1)Heated Seat Switch - Driver
Figure 2:

Driver Seat


Object Number: 389015  Size: LF
(1)Seat Belt Switch
(2)Seat Lumbar Vertical Adjuster Relay, Lumbar Horizontal Adjuster Relay
(3)Heated Seat Back Element - Driver
(4)Front Seat Finish Panel
(5)Seat Adjuster Switch - Driver
(6)Seat Lumbar Switch - Driver
(7)Seat Lumbar Switch - Driver, and Seat Adjuster Switch - Driver
(8)Heated Seat Control Module - Driver
(9)Heated Seat Control Module - Driver