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

Liftgate Release Motor Wiring


Object Number: 277193  Size: MF
(1)C406
(2)C404
(3)Liftgate Release Motor
(4)P410
(5)C450
(6)P409
(7)C314
(8)C402
Figure 2:

Body Wiring Harness, Left Side


Object Number: 372232  Size: MF
(1)Front to Rear Body Harness
(2)Door Lock Control Module (Except Luxury) or Liftgate Release Relay (Luxury) or Cargo Door Lock Relay (Luxury)