A telematics control unit in a vehicle couples to a vehicle communication network bus and monitors signals on the bus that correspond to various parameters related to entertainment devices in the vehicle, such as, for examples, a radio, a telephone, and a video player. During a predetermined period, the TCU monitors the entertainment device signals and stores information represented by the signals to a memory. The TCU transmits the entertainment device signal information from the memory to a telematics operations center server operated by a telematics services provider. The TOC is configured to analyze the status of the entertainment signal information to determine various entertainment device settings in the vehicle and how they correlate with given entertainment programming, based on programs being broadcast when the TCU monitors the signal, or programs an occupant of the vehicle plays from storage media. Advertisers may obtain the information analysis and tailor advertising accordingly.