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

Power Seat Component View


Object Number: 399763  Size: LF
(1)Seat Belt Switch
(3)Seat Adjuster Switch
(4)Seat Adjuster Motor (Rear /Vertical)
(5)Seat Adjuster Motor (Forward/Vertical)
(6)Seat adjuster Motor (Horizontal)
Figure 2:

Under Left Hand Front Seat


Object Number: 298743  Size: SH
(1)C330