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
IGN Main 1, SDM, T/SIG, CRUISE and PCM PASS KEY/CLUSTER Fuses
IGN Main 1, SDM, T/SIG, CRUISE and PCM PASS KEY/CLUSTER Fuses
IGN Main 1, SDM, T/SIG, CRUISE and PCM PASS KEY/CLUSTER Fuses
Engine Data Sensors - MAF and VSS
G302, Page 1 of 3
G302, Page 1 of 3
Backup Lamps
G402
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