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2005 - 2009 Cadillac XLR: Service Bulletin: #PIC5485A: Noticeable Difference In Audio Volume Level When Selecting Favorites Or Switching Between The AM/FM Bands CD And/Or XM - (Oct 24, 2011)

#PIC5485A: Noticeable Difference In Audio Volume Level When Selecting Favorites Or Switching Between The AM/FM Bands CD And/Or XM - (Oct 24, 2011)

Subject Noticeable Difference In Audio Volume Level When Selecting Favorites Or Switching Between The AM/FM Bands CD And/Or XM
Models 2006-2012 Buick LaCrosse
2006-2012 Buick Lucurne
2011-2012 Buick Regal
2010-2012 Chevrolet Camaro
2005 - 2012 Chevrolet Corvette
2006-2012 Chevrolet Impala
2006-2007 Chevrolet Monte Carlo
2004-2012 Chevrolet Malibu
2012 Chevrolet Sonic
2005-2012 Cadillac CTS
2006-2011 Cadillac DTS
2005-2012 Cadillac SRX
2005-2011 Cadillac STS
2005 - 2009 Cadillac XLR

This PI was superseded to update model and model years. Please discard PIC5485.


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

Condition/Concern:

A customer or dealer technician may notice a difference in audio levels when switching between favorites/presets and/or bands. After observing the concern it may be noticed that the concern is happening when going between AM/FM, CD, and/or XM bands.

Recommendation/Instructions:

Important: Before replacing any components, review the following conditions.

  1. Verify that the equalizer settings are all set to the same levels for each band when comparing audio differences as when storing the stations it may also store the EQ settings. The increased or decreased bass and treble settings will enhance the level of noticed change.
  2. Try multiple CD'S; this may be normal due to variations in the CD/MP3 burning process with commercially or consumer produced disc's.

If the concern changes with either of the above conditions, this is normal and no parts should be replaced for this concern.

Please follow this diagnostic or repair 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.

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