2003 Buick Rendezvous Owner's Manual - Page 445

To turn the vehicle's speakers on and off, press either the CD/AUX or the TAPE/CD button on the front audio system. The audio from the entertainment system can be heard through both the wireless headphones and the vehicle's speakers at the same time. You can listen to the entertainment system through the (if equipped) wired headphone jacks on the RSA system when the following occurs: The RSA system is on, a DVD or auxiliary device is playing, and RSE is displayed on the front audio system by pressing theTAPEKD button on the RSA system. The volume on the audio system may vary when switching between a radio station, CD, DVD, cassette or auxiliary device. If there is a decreased audio signal during CD or DVD play, you may hear a low "hissing" noise through the speakers andlor headphones. If the hissing sound in the wireless headphones seems excessive, make sure that the headphone batteries are fully charged. Some amount of hissing is normal. 2