Question about Alpine CDA-9857 CD Player

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Alpine CDA-9857 Volume Fluctuations

I purchased this head unit about 18 months ago and installed it myself. Works great, never any problems. Over the last few months, however, when I am listening to XM the volume will suddenly dip down to a very quiet level. A few minutes later, and unpredictably, it will jump back to where it was. The volume "number" doesn't change if I check it by turning the knob, but the actual sound level is different. Doesn't happen on radio/CD/iPod. Nothing in the vehicle has changed, including settings on the head unit, in many months. This is installed in a 2002 VW Passat with Monsoon. Thanks in advance.

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  • Tygh Duval
    Tygh Duval May 11, 2010

    Initially, my thought was the mute function was being somehow automatically engaged. But it should display a "mute" note on the display or something else obvious, so I doubt that's the case. The fact that it happens only while listening to XM makes me suspect the XM receiver is the source of the problem. Check to make sure the connection to/from the XM receiver is good with no corrosion or dirt. Check the power/ground on the XM receiver and make sure they aren't loose. If I have any more ideas, I'll let you know!

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Please see my solution posted on Mar 13. No other brain waves yet!

Posted on Mar 18, 2008

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