HVAC Control Module

WARNING: This page is about a different car, the 2002 Cadillac Seville. However, it is still accessible from the selected car via links, so may be relevant.

The HVAC Control Module (IPM) is a class 2 device that interfaces between the operator and the HVAC system to maintain air temperature and distribution settings. The battery positive voltage circuit provides power that the control module uses for Keep Alive Memory (KAM). If the battery positive voltage circuit loses power, all HVAC DTCs and settings will be erased from KAM. The Dash Integration Module (DIM), which is the vehicle power mode master, provides a device on signal.

Actuator Calibration
Personalization
Purge

The HVAC Control Module (IPM) will receive information that defines the current driver of the vehicle from the Driver Door Module (DDM) through class 2 communication. The HVAC system will memorize the following system configurations for up to two unique drivers:

Driver Set Temperature
Passenger Set Temperature
Mode
Blower Motor Speed
A/C Compressor Request, AUTO On, Or A/C Off

This information shall be stored inside the HVAC Control Module (IPM) memory. When a different driver identification button is selected the HVAC Control Module will recall the appropriate driver settings. When the HVAC Control Module (IPM) is first turned on, the last stored settings for the current driver will be activated except for the rear defrost and heated seat settings.