Have Mercedes Questions? Ask a Mechanic for Answers ASAP
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If the tele aid is still wired into your vehicle if it has failed the tele aid control module can cause the fiber optic circuit to fail and cause a no signal/communication issue causing this fault here.In order to correct this the tele aid control module will need replaced or the dealer can use a bypass adapter and remove the tele aid control module and reprogram the computers to make the vehicle think it doesnt have tele aid at all.This should allow the raduo and cd changer to work again and is usually far less then the $5000 to replace any of the tele aid components.Usually around $200 to have this done instead.I would ask the dealer if they can do this for you to see if it corrects the fault here.
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