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I have a 2005 s430 and sometimes the command system will shut itself off again and start up out of the blue. Other times like now the sound dosent come on when I start the car. It was working fine on way home then i stopped to get a movie and started car again and I dont have any sound, no navigation, no satellite, or CD. Any ideas on what to do to fix it?
 

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I would start with the head unit SW update (unless already up-to-date). Old ones are playing up sometimes. If it isn't the HU, then one of the devices at the fibre ring are acting, not getting power or the fibre connector being loose.
 
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