2001 Ford Taurus, check engine light is on, goes out when headlights are turned on. When driving, the door ajar light comes on and the automatic door locks unlock and lock rapidly.

Check engine light is on, no codes thrown.  Goes out when headlights are turned on.
Escallated recently when driving, the door ajar warning illuminates intermittantly and the
automatic door locks lock and unlock rapidly.  This is temporarily relieved if either front
doir is opened and closed.