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

Rear Object Sensor Control Module, Power and Ground


Object Number: 677420  Size: FS
Master Electrical Component List
Object Detection Description and Operation
Object Sensors
IGN1, SDM, T/SIG, CRUISE, PCM PASSKEY/CLUSTER fuses
IGN1, SDM, T/SIG, CRUISE, PCM PASSKEY/CLUSTER fuses
VSS Figure
G302
G302
Backup Lights
G401
Figure 2:

Object Sensors


Object Number: 677424  Size: FS
Master Electrical Component List
Object Detection Description and Operation
Rear Object Sensor Control Module, Power and Ground