car locked itself with a key in ignition

[predrag1]

so a few days ago remo and I were checkin out my car and we left the key in ignition, he closed the door and the car locked itself with the key in, I don't think its supposed to do that, i think i have some 3rd party alarm shit tho, anyone else had this problem coz Im pretty sure 202s dont lock like that if the key is in

[ryhi]

i think it does automatically lock after a few mins. thats why i always open the window when leaving it idle.

[NEA-4311]

mine doesn't:eek: What happened then?

[anf6789]

i have a 1994, mine doesn't.

[ron]

Mine does this, I have a 99 c280 sport with the stock alarm (updated smaller key though).

It has locked itself with the car RUNNING before! Luckily I had my spare at the time.

[Markland556]

there is a way to turn that off. You hold the lock button for like 10 seconds or something... check your book for the car.

[predrag1]

Originally posted by NEA-4311
mine doesn't:eek: What happened then?

had to get my sister to bring the spare key over lol


but first we tried unlocking it over the phone lmao, I duno if u guys heard about that trick

[xvvvz]

I know the 99s will lock themselves after a certain point in time but I would have thought it would be smart enough to not lock if the key is in the ignition! I had this turned off by the dealer when the car was new because I knew it would be trouble. As the previous poster said, check your manual because I believe I remember reading a procedure in there too.

[RemoLexi]

mine will never lock itself.

[benzonline]

The only way I know these cars lock by themselves is if u unlock it by hitting the unlock button on the key, but then not opening a door or anything for 30 seconds. Once you open the door it will/should not lock itself again.

[OzC36]

My wife found that by accidentally pressing the remote button on the key while turning off the engine, then leaving the key in the ignition and exiting the car and closing the door, that the car will lock itself with the key still inside. And of course she did this 100 km from home with the credit-card size emergency key safely stowed in her purse which was also locked inside the car.

Bless her little cotton socks! Perhaps I should send her to Germany as a consultant to Mercedes vehicle testing division. Maybe they might want to keep her...

[Logic]

i have two keys that do two different things, when using one it will lock and unlock all doors , the other will only unlock the drivers and then click it again and the others will follow....i m thinking EACH KEY IS PROGRAMMABLE TO DO DIFFERENT THINGS

[xvvvz]

Logic, yes, these two types of behavior are normal. The manual tells you the key button sequence to press that allows you to switch between behaviors.

[smartkey]

I remeber on one occasion that my car locked it self while idling after I had driven it shortly to my Auto body repair shop. The kicker was it was 8:30 at night and the car only had one key which was in the ignition.

My buddy manage to get the door open with a coat hanger nonetheless but could never duplicate his magic act.


This is not supposed to happen no matter year you car is. If this happens that means that your car has a vacuum leak and the vacuum pump did not finish it cycle so when it did you just did not happen to be in the car.


To trouble shoot this problem you need to test all the vacuum actuators for the locks and the pump in the trunk.

I will tell you this if you shut off the anti-carjacking/autolock feature you have way less issues with the vacuum pump and you extend its life.