It should be the reverse of installing, there's threads on this forum that show how to install. The power is run to a junction box thing under the driver side kick panel area by the brake pedal. The module/brain is usually under center console tray or one of the seats
You should be able to track it down by following the wiring from the headrests. If the Escalade is being parted out shouldn't the owner pull these for you? If the price difference isn't much you'd probably be better off buying the Ebay package. Either way it goes neither module will likely have the inputs to connect to your headunit.
You should be able to track it down by following the wiring from the headrests. If the Escalade is being parted out shouldn't the owner pull these for you? If the price difference isn't much you'd probably be better off buying the Ebay package. Either way it goes neither module will likely have the inputs to connect to your headunit.