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Old 01-20-2013, 04:09 AM
chrisn7 chrisn7 is online now
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Location: Huddersfield, West Yorks
Join Date: Oct 2011
Posts: 707
Mein Auto: 750iL
Its important to understand that the head unit is just a monitor-its not like other cars. The dsp amp, radio module, tv module, nav module are all in the boot. So:

No or poor sound from all these: radio, cd changer, cassette player = amp module fault
No or intermittent sound from just radio = radio module, usually dry joints to certain joints on internal circuit boards
No video signal = nav module, test by substitution or via tv module if present. (in the UK the Traffic Master should be unplugged before testing the nav, being a common cause of loss of video)
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