door locks unlock by themselves

2000 T&C 3.8 with 74,000 miles. It just started acting up. The locks
automatically lock at 15 mph like they should. However when you slow up or
stop for a stop sign the doors will frquently unlock by themselves. It also
happens after you get out of the van and lock the doors either with the key
fob or with the lock button on the driver's door. After you walk away the
doors will unlock on their own. Any ideas? thanks.

 

Not a battery problem in the remote, does this happen mostly when its
raining or wet out?
Could be your disarm switch in one of the doors causing the problem

Glenn Beasley
Chrysler Tech

 

replace the battery in the key fob

 

It doesn't matter if it's wet or dry. The doors are always latched tight so
it's not that the computer thinks the door is ajar. Where is the disarm
switch? Would the body control module have anything to do with it and if
so where is it? It must know when we are slowing or stopped. I've read
about a key fob module behind the instrument cluster up high by the
windshield but I wasn't sure if that could be it so I didn't tear into it.
I pulled the door lock relay from under the hood and of course the locks
don't work then. I don't think it could be a faulty relay intermittantly
switching to unlock the doors because it only unlocks and doesn't lock
them randomly. Thanks for the help guys.

 

The door ajar has nothing to do with the disarm switches, they are located
in the drivers and passengers front doors, mounted on the key cylinder. The
best way to check these out is to use a scan tool and monitor them as it is
happening

 

you need to find out if you have a aftermarket keyless system such as one the
dealer might add
then if you do not then fault codes need to be pulled from the bcm and the
securirty system i suspect that trhe bcm has a doide failing internally but
onbly pulling codes can tell u this

 

How hard is it to change the disarm switch? I can see where it may be just
setting of signal because its faulty.