• Some GM model cars need a how do you say.. box of some sort.. lol.. connected to your harness and other things in order to keep your original options working properly. I just heard of this myself the other day while shopping for a new Radio. I seen this box thing and read it and it said it was used for htis same thign you are describing. I have no further info except it was at Wal-mart. Wish i had more help for you but it was like a month ago. good luck.. search it up

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