I always Lock my 02 ML320 doors in the evening but when I go out in the morning they are unlocked. It must be unlocking itself in the night. Has anyone ever heard of this problem?
There is a problem with the rear doors locking and unlocking I never use them so I have locked them manually and they remain locked. I only mention this because perhaps it's related. It's a very mysterious situation. Thank you in advance for any help.

only time I've seen an ml unlock itself is when something heavy is left on the seat. it won't let you leave your kid or dog in the car while you lock up and run in real quick. good luck, chuck.