Where you bought it
Is he bought it from them take it to them if you bought it from someplace else take it to that place if not and it's within warranty you probably can get free shipping to send it back to the manufacturer and have it repaired for free if it's a Sirius XM or something like that
They have a customer service department in a lot of their dt9res to help if you bought an after market product from them. Otherwise dealership or mechanic
Probably at the dealership
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