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

Garage Door Opener
Object Number: 1888821 Size: FS
Master Electrical Component List
Garage Door Opener Description and Operation
Control Module References
Keyless Door Entry
Figure 2:

Keyless Door Entry
Object Number: 1888823 Size: FS
Master Electrical Component List
Keyless Entry System Description and Operation
Control Module References
Garage Door Opener