Instrument Panel Integration Module
WARNING: This page is about a different car, the 2002 Buick LeSabre. However, it is still accessible from the selected car via links, so may be relevant.
A function of the Instrument Panel Integration Module (IPM) operation is to process HVAC system inputs and outputs. Also, the IPM acts as the HVAC control modules class 2 interface. The battery positive voltage circuit provides power that the IPM uses for Keep Alive Memory (KAM). If the battery positive voltage circuit loses power, then all HVAC DTCs and settings will be erased from KAM. The ignition 3 voltage circuit provides a device on signal.