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Chrysler Repair/Door Sensor/security system non-function

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Question
I have a 2004 Grand Cherokee Jeep . I have an alarm system and the alarm will not work because I was told that the door sensor is not properly functioning causing the alarm not to trigger. What must I do?

Answer
Hi Sandra,
Was that diagnosis based on a fault code? If so, if you might have that 4-digit number that would be helpful to know.
The door latches include an ability to notice if the door is ajar when you think it is closed, but the latch could be erroneous.
The alarm system will not 'arm' itself if it thinks that one of the doors is ajar. The cause for it believing it is ajar is integral to the latch itself, so generally if it is falsely reporting the door is ajar the latch mechanism needs to be replaced.
Does the instrument cluster indicate that one of the doors is ajar when it really isn't? If so, then that would be the latch to consider for replacement. Ideally there should be a corroborative fault code, and ideally an electrical test done of the latch wiring. If all proves o.k. then replacing the door latch would be the solution. However, a fault code number would be helpful to know.
Please read the PS (below) and respond to it.
Thanks for doing that.
Roland  

Chrysler Repair

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Roland Finston

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Get a Free Fast answer to your repair question about a Chrysler/Dodge/Plymouth car, minivan, SUV, or truck. Problems with electronically controlled engines and transmissions as well as body wiring problems are my specialty. This free troubleshoot advice forum helps you diagnose faults, minimize repair costs or do-it-yourself.

I answer questions seven days a week and respond to you in about 30 minutes. "Maxed Out" means I am answering another question, briefly unavailable, or asleep overnight, so try again later.

I have do-it-yourself experience (50+ years) and a library of 100 1982-2012 Chrysler factory shop manuals and 20 multi-manual Chrysler Corp. CD's.

I was voted "Top Expert" 2010-2015, here at AllExperts, and have answered 20,000+ questions.

Experience

Five decades as a 'do-it-yourselfer' on domestic and imported cars.

Organizations
Yahoo Autos Group called The Chrysler Lebaron Club (co-moderator)

Education/Credentials
Advanced degrees in Physics/bruised knuckles

Awards and Honors
"Top expert" of 2010, 2011, 2012, 2013, 2014 and 2015 here at Allexperts. Quickest "average response time" at Allexperts (currently no. 1).

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