I searched around and saw some similar issues, but not exactly the same so I figured it was worth a new post.

2000 Accord LX 4-dr 4-cyl

Randomly throughout the day, whether the car is driving or parked, all 4 doors lock and unlock together. I thought this was related to my aftermarket car alarm so I had it disconnected, but the problem has continued. Obviously this is annoying because my car will unlock itself in the middle of the night! I haven't been able to detect any pattern as to when or how often it happens.

From reading other posts I'd guess that it's related to the actuator(s), but most other people were reporting issues with just one door and I've only seen it happen with all doors simultaneously.

Thanks in advance!

 

Hard to believe I've stumped the HAF, but just a bump in case someone can help.

 

Well I'm not stumped......Most cases of random unlocking are due to drivers door actuator, but usually the locks cycle right away when you lock the door.

Now the real reason, nobody answers questions such as this;

If I go thru all the time and effort to get someone all the information needed to make a correct & accurate diagnose, 9 times out of 10 the person wants a "silver bullet fix" and won't even consider bending over to check a voltage reading under the dash board at the multiplex controller.

 

OK, sorry to preemptively disappoint you as a typical lazy owner. I will try elsewhere, thanks.

 

maybe it just be a remote malfunction if it is keyless entry. if so try to just take out the batteries of the remote and see if it happens again.

 

Unfortunately that's not it, the only keyless entry was that aftermarket alarm system which has since been disconnected.

 

Well it's going to be hard to "catch it in the act".

Maybe try a multiplex wake up to see if that helps.
intermittant power to the multiplex controller could cause the problem.