Does anyone know where the control unit for the anti-theft system lives on a 1990 350SDL? My door locks activate by themselves, within about 15 seconds after unlocking doors, they automatically lock back, doors open or shut, key on or off, I don't think this is normal. I don't want to disable locking function of system, just the disable the control unit, but I have not been able to locate it so far, any help will be appreciated.