When I switch the engine off, the stereo switches off and the antenna retracts, just as you would expect. However, as soon as you open either of the front doors, the antenna rises and the radio switches on. Then as you get out of the car and shut the door, the antenna retracts and the stereo switches off. Can anyone offer a solution to this problem? All of the other electrics on the car work fine, including the courtesy lights in the bottom of the doors and by the rear view mirror. I have checked the wiring for the Stereo, a pioneer head unit with 6 CD changer mounted in the boot (trunk), although if someone can confirm the colour coding for the wiring for all the leads apart from the speaker leads I would be grateful. The car is a 1986 W126 300SE with 62,000 miles on the clock.