Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
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Disconnect both battery cables (positive and negative) and clamp or use a jumper wire to hold them together, turn key to on position and let it sit for 10 minutes. Then turn ignition off and remove key, reconnect battery cables at a time, positive first then negative. This should reset the system.
If this doesn't not work then you will most likely have to replace the unit.
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Its perfectly safe. Yes it is resetting all of the computers in the car including the radio. Hopefully it works out for you.