2004 GMC Envoy Owner's Manual - Page 226

Navigation/Radio System Rear Seat Entertainment System Your vehicle may have a DVD Rear Seat Entertainment (RSE) system. The RSE system includes a DVD player, a video display screen, two sets of wireless headphones, and a remote control. Parental Control This button is located behind the video screen. Press this button while a DVD or CD is playing to freeze the video and mute the audio. The video screen will display Parental Control ON and the power indicator light on the DVD player will flash. It will also disable all other button operations from the remote control and the DVD player, with the exception of the eject button. Press this button again to restore operation of the DVD player. This button may also be used to turn the DVD player power on and automatically resume play if the ignition is in RUN, ACCESSORY, or if RAP is active. Navigation/Radio Display and Controls Your vehicle may be equipped with a navigation radio system includes digital sound processing (DSP), Radio Data System (RDS) with program type (PTY) selections that will seek out the kind of music you want to listen to and XM™ Satellite Radio Service capabilities (48 contiguous US states, if equipped). The radio system can also communicate with your navigation system to broadcast announcements on traffic, weather, and emergency alert communications. For information on how to use this system, see the "Navigation System" manual. 3-106