The door jamb switch might need a pad placed on the door side. Often seat belts will dent the door causing to big of a gap and the light will go on and off.
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SOURCE: door ajar light and auto locks keep going on and off while drivin
It sounds like there is a short somewhere. Either a bad ground, pinched wire going from the door to the fuse box, or a possibly a bare wire shorting out onto something. You say that the door adjar light and the door locks are affected. Check the door switch and make sure that it isn't broken, shorted out or sticking. Function test it. If you disconnect the door switch and take a test drive does the problem still exists? Yes? Disconnect the other side. Did that cure the problem? Yes? Replace as necessary. No? The problem isn't in your door switch(s). So that much has been ruled out. These are just some areas to start trouble shooting. At first I immediately thought "Door Lock Switch," but when you mentioned that the Door Ajar light keeps going on along with the light then it leads me away from the Controls and more towards the Door light Switch usually in the jam of the door, but you didn't mention the year, make and model, so location of the switch is obscure. If the door locks are switching on and off and the door adjar light is in harmany with it then make sure the door is secure, not loose when closed allowing the door adjar switch to break the connection. These are the areas I would investigate first. Is there a significant amount of slop in the door when you push and pull on the door like it isn't secure? These are some areas to take into consideration when trouble shooting.
Good luck. I hope this helps narrow things down for you.
SOURCE: door ajar keeps coming on
Door jam switch is shorting out unhook the switch in the door jam and see if that changes anything if it does then replace
SOURCE: 2003 Jetta Door ajar light keeps coming on and
You need to replace the door jamb switch. Little button on the door jamb that is pressed in when doors are shut.
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