Could be a sticking start relay. I believe it's the relay 175? I could be wrong. Try pulling it and see if your problem is solved
I have a 98 Jetta wolfsburg. I went to the car wash. Everything was fine. I went home n parked it turned the alarm on. Then about 1030 the alarm was going off. So I went outside and the radio was on and dash was lit up as if I were about to start the car. So I started it. Then it wouldn't shut off unless I stalled it out. N the accecories stay on unless I unhook the battery. I replaced the ignition switch. Same crap no change . So any ideas???
the module itself could be going bad.
disconnect it and bypass it with a jumper wire/clip so you can start the car up. if you dont have any more electrical problems, its the module.