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

Input


Object Number: 669632  Size: FS
Master Electrical Component List
Rear Hatch/Gate Description and Operation General
Output
Headlight Leveling Schematics (Export)
G203 and G204 (Utility w/ Manual A/C)
G203 and G204 (Utility w/ Manual A/C)
Transfer Case Shift Control Switch
ILLUM Fuse, Shift Control Switch and Body Control Module (BCM)
G203 and G204 (Pickup)
SP201 (4.3L)
Figure 2:

Output


Object Number: 669639  Size: FS
Master Electrical Component List
Rear Hatch/Gate Description and Operation General
Gate Ajar Indicator
Input
B+ Bus Bar
MIR/LKS, FOG LP Fuses and DRL, Headlamp Power Relays
Liftgate/Endgate Lock Cylinder Switch Inputs (Utility)
G420 and G450 (Utility w/ Liftgate)
G420,G450 and S427 (Utility w/ Endgate and Crew Cab)
Figure 3:

Gate Ajar Indicator


Object Number: 669642  Size: FS
Master Electrical Component List
Rear Hatch/Gate Description and Operation General
Output
Indicators
SP201 (4.3L)
G420 and G450 (Utility w/ Liftgate)
G420,G450 and S427 (Utility w/ Endgate and Crew Cab)