GM Service Manual Online
For 1990-2009 cars only

IPC Power Ground, and Class 2

The IPC receives battery positive voltage from the underhood junction block SBM/LCM fuse CKT. The IPC receives ignition voltage (ACC and ON) from the rear junction block PCM/CRU fuse CKT.

The IPC receives all class 2 messages, via the class  2 serial data line.

The IPC ground location is at G202.