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Cadillac Technician
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If this is the GM accessory DVD headrest system, you can't.
They are not connected like that.
Don't ask me why but they didn't do it.

If it is aftermarket, it is even less likely that you can do it.
 

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You need a t harness that plugs into the back of the Nav unit which has a/v input and out put. I got mine from coastaletech for like $75....if you don't have factory RES then you must then take your rig to the dealership and have them unlcok the U42 code and you are all set.
 
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