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Did you install yourself or have the shop install? Metra makes separate main harness and steering wheel control interfaces for my 02 Denali but not a single unit. They use 2 separate plugs on the factory harness and the Metra is an actual programmable box just like the PAC stuff for the steering wheel controls. The main wiring is one separate plug/ harness and the steering wheel control is another that connects to the box.check with your local stereo shop and get the part number for the metra harness. they are pricey ( mine is 85) but the one harness keeps all the features including steering wheel control and powering up the factory amp.