Solutions
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ILOVEMYSUPERB's post in Turn off radio mute when reversing? was marked as the answerOn my Columbus its under the tone button
Tone
Volume settings
PDC: Reduce Audio Vol.
Pick low or off
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ILOVEMYSUPERB's post in Columbus map freeze was marked as the answerThere's a fairly long post in here from a few months ago on the same issue, might offer some advice:
http://www.briskoda.net/forums/index.php?/topic/292930-Urgent-ish-help-required-wifey-and-sat-nav-in-trouble-!
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