False Door Ajar (passenger rear) alert

[05LincolnLSV8]

My 05 Lincoln ls is giving false door ajar warning messages whilst driving. it doesn't happen at all times, just often enough to be annoying. I believe this is what is causing the alarm to go off intermittently when i leave it locked.
Is there anything, short of taking it to a professional, that i can do to fix this?

[jerryg2112]

You can try spraying some contact cleaner in the door mechanism. It worked for me once when my Continental's dome light kept coming when the door was closed.

[shorod]

Welcome to the forum!

This is a rather common issue with several Ford models. The door ajar sensor/switch is located in the door latch assembly and the switch gets dirty over time.

I've had good luck spraying the latch assembly with electrical parts cleaner, then I open and close the door several times. I follow that up with an application of Caig brand De-Oxit, again open and close the door several times, and finally I spray Caig Presev-It in the latch assembly, then cycle the door several more times. Once I confirm that the door switch is functioning reliably, I lubricate the door latch assembly with either silicone spray or a Teflon dry lube.

Several other folks have used WD-40 in the latch assembly and have been pleased with the results. I shy away from WD-40 though as it is not an electrical contact cleaner nor is it a electrical lube. But I also realize the Caig products are not readily available in most parts of the country so I throw the WD-40 option out there.

-Rod

[danielsatur]

If the switch is bad, there's plenty of spare in your local salvage yard.
See http://www.automotix.net