Dash Integration Module
WARNING: This page is about a different car, the 2001 Cadillac Seville. However, it is still accessible from the selected car via links, so may be relevant.
Dash Integration Module (DIM) is wired to class 2 serial data circuit. DIM functions include the following: control of exterior lights, hood ajar switch input, horn relay control for theft activation, interior lights and incandescent dimming, low side temperature for Heating Ventilation Air Conditioning (HVAC) compressor, power moding control over class 2 serial data circuit, steering wheel controls, storage of clock settings and sending a message out on class 2 serial data circuit in response to requests form other modules.