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

Driver Seat


Object Number: 793115  Size: LF
(1)Seat Adjuster Switch
Figure 2:

Under the Left Front Seat


Object Number: 806753  Size: MF
(1)Seat Horizontal Motor
(2)Seat Rear Vertical Motor
(3)Seat Front Vertical Motor