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

Body Wiring - RR


Object Number: 374539  Size: SF
(1)S334
(2)S335
(3)Liftglass Lock/Unlock Relay
(4)Liftglass Lock/Unlock Relay Connector
Figure 2:

Liftgate Harness Location View


Object Number: 781495  Size: LF
(1)Rear Window Defogger Grid Connector C1
(2)Rear Window Defogger Grid
(3)Rear Window Defogger Grid Connector C2
(4)Rear Window Wiper/Washer Module
(5)Rear Window Wiper/Washer Module Connector
(6)Rear Window Wiper Motor
(7)Liftglass Lock/Unlock Release Switch Connector
(8)Liftglass Release Actuator
(9)Liftglass Release Actuator Connector