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Hi,
You need to pull the Faceplate and clean the Brass contacts on both the Faceplate and Head Unit with a Q-tip and some Rubbing Alcohol. Then, carefully reattach it so as to be sure that all the contacts line up. This should solve your problem.
The Faceplate actually contains microprocessor circuitry which controls the HU. If the contacts get dirty, or misaligned, it don't work. Hope this helps...
Happy Motoring!... Jim'99
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