My dads truck, 07 Classic Sierra sometimes doesnt recognize the front doors are open. He has amp steps and they will randomly not come down when he opens the door. I noticed his dome light comes on, but the key buzzer doesnt chime when the doors open sometimes. We tested it to see what it might be. We have replaced the amp step brain with no change. We just replaced the aftermarket radio harness thinking that might be it, nope. The truck wasnt touched whatsoever until he bought it so its not been tampered with. Does anyone have any other ideas? Tricks to try? Its only the front two doors, if we open the rear it recognizes right away and drops the steps.