DVD Sound Quality is Not Optimal 2005 Cadillac STS - keywords audio CD disc nav navigation radio YQ4

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in the PI.

Some customers may comment that they get a less than optimal sound quality when listening to an audio DVD on 2005 Cadillac STS equipped with the Navigation Radio (RPO YQ4).

To get the best sound quality from an audio DVD, the current group that is playing may need to be changed. Audio DVDs are usually set up with multiple copies of the album on the disc, called groups. Group 1 may play the album in PPCM audio and Group 2 may play the album in Dolby Surround Sound.

To switch these groups, do the following:

1. Put the vehicle in PARK (P).
2. Go to the DVD/CD screen where you see the DVD/CD controls.
3. Select the "Search" screen button.
4. Input the number of the group into the numeric keypad.
5. Select the "Enter" screen button.
6. Push the "Audio Adjust" hard key.
7. Touch the "Multi-channel" screen button. (This button will only be selectable when playing DTS or Dolby tracks in surround sound.)

Touch the "Multi-channel" screen button. (This button will only be selectable when playing DTS or Dolby tracks in surround sound.)

If the DTS or Dolby logo is shown on the status bar but the "Multi-channel" screen button is grayed out, the group may contain 2 audio streams (one is stereo source, another is surround source (DTS or Dolby) in one group. In this case, user needs to switch audio streams by pushing Audio screen button in DVD/CD screen. Push the "Audio Adjust" button and check if the "Multi-channel" screen button is selected. This button will only be selectable when playing DTS or Dolby tracks in surround sound.

Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

(2005 Cadillac STS)