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Does anyone know which pin/wire on the back of the radio mutes it? I want install aftermarket Nav Unit. I'm looking for a mute input either on the back of the factory radio (Business CD) or near the Amps connector. Thanks.
 

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I don't believe the non-navi cars are equipped with the mute signal. What you can do, however, is put a relay in line with the accessory wire that goes to the factory radio so it shuts down when it receives the mute signal from the aftermarket navi.
 
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