Hello I just bought a 97 Chevy silverado z71 and I love this truck but I have a crazy radio as it comes on at will after I have parked and left truck...I came back to it and I thought somebody parked next to me we're in their car listening to music and it was my truck playing the radio with no key, doors locked and alarm armed...so I pull the radio to make it stop because I can't figure another way...PLEASE HELP ME!!!