Hi. A customer of mine needs me to replace a stolen stereo from his 2005 Four Winds Chateau. It has a Chevy cab. There is what appears to be a regular chevy plug and a black box that was left loose in tha stereo opening, with a Gm part #1569408 "alarm acm seat belt lamps ignition key turn signal" I'm pretty sure there was an aftermarket radio in there before which leads me to believe that this was a door chime module. There must be some sort of T-harness for this but I'm not sure what I need. Any help would be appreciated thanks.