Heated OSRV Mirror
WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
On vehicles equipped with heated OSRV mirrors, the DDM and PDM controls the activation of the mirror heaters. Upon receiving a Class 2 message indicating a request for heated mirrors, the DDM, and PDM for the passenger side, will activate the mirror heater output. The mirror heaters will remain active until a new message is received indicating rear defogger is to be deactivated, either by driver input or by expiration of a calibrated timer.