BMW E38 - No Sound, Audio problem - MK3 - Sat NAV - 728i - Bimmerfest - BMW Forums

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Old 07-05-2011, 03:44 PM
Seven28iM Seven28iM is offline
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Location: London
Join Date: Jul 2011
Posts: 1
Mein Auto: 728i M Sport
Post BMW E38 - No Sound, Audio problem - MK3 - Sat NAV - 728i


I have a 2001 UK BMW 728i Sport with a factory fitted MK3 Navigation system running v25 (3-1/62).

Since around a year it has been giving me sound problems in general. All the functionalities of the Navigation/CD/Radio/Cassette and OBC are operational but there is no sound from the speakers most of the time.

I have had this checked from BMW - Holland Park who initially performed a 80 diagnostics and said they think it could be related to the ignition switch as a correlated sign was the airbag light coming on intermittently.

Replacing and testing showed no change - except the sound system started working more often but no reliability; so they put the original ignition switch back on.

BMW now say it could be the radio controller at the back @ 550 + VAT. As I understand this is integrated with the Audio Driver/Amp.

I have physically checked - all connections and units are secured properly.

Has anyone else seen a similar problem ? Any ideas or checks or tests I can do to identify the root cause or a fix ?


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Old 05-16-2012, 01:10 PM
patrickgonzales patrickgonzales is offline
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Location: USA Fl
Join Date: May 2011
Posts: 1
Mein Auto: BMW 520i
Hi Bmw Enthusiasts

Hi my name is Patrick, I have two bimmers both euro 520i and a 728i.
I have enjoyed reading your posts, hope i can post something that will help
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