A Class 200 Cannot unlock car! Need Rapid Help
 

Hi all,

Really need some help! Firstly car boot lock started to stick a bit ago, sometimes it opens when it feels like it but never when I want it to!

Is this something I need Mercedes to fix?:confused:

Secondly, now I now cannot get into the car at all, either with fob or with key! We have had extreme cold weather and lots of snow recently, is this a case that the mecanisms have frozen over?? I wouldn't have expected it to!

Is this something Mercedes needs to attend to or is there another solution??

Kind Regards
A frustrated A Class driver :mad:

Solution found
 

Thanks to another thread I sussed out how to open the door with the key blade. On closer inspection it appears that the battery was dead.

If anyone has any idea as to how this is possible when no lights or heaters or anything requiring battery life was left on in the car overnight it would be greatly appreciated - then the same can be prevented next time, or something needs to be addressed by Mercedes themselves.

thanks again :)

Are you talking about the key fob battery or the car battery??

The fob battery can be changed out by looking at your book.

The car battery may have just died, check the cells to see if they are frozen.

Bill

Bill,
It was the car battery. When I couldn't open the car at all to begin with I thought it might be the key fob alarm battery. But it was still the case with the spare key fob.

Once i'd hooked the car battery up to be jump started it was fine, took it for a spin on the motorway and so far so good.

How would I know the cells on the battery were frozen? or is that a silly question? The battery and the fuse board sit beneath the drivers footwell and both seemed fine, no frosting or condensation at all.

Its very strange I've had it from new and certainly didn't expect such a vehicle to end up with a flat battery when nothing is ever left on in the car I make of point of switching everything off! Is it just 'one of those things' ?

thanks again

From what I understand much of Europe and I'm guessing that's where you are from, Great Britain??? is under a deep freeze.

An older battery or one that is discharged can have a low specific gravity and the battery solution will freeze. Remove any battery cap and see if the solution is still liquid.

Come to Canada where dead batteries are a way of life in some areas.

I would check the charge of the battery with a hydrometer and check battery voltage. If low put on a trickle charger to charge the battery and recheck.

Battery life in extreme cold is about 4 years.

Bill

Yes
 

That's right enjoying the big freeze in Great Britain, North Manchester unlike my car that is now submerged in about 30inches of snow that looks like icing sugar!! pretty!

I ran your comments by my dad (i'm a female and have to do these things regularly when it comes to cars ha!), apparently my A class doesn't have the kind of battery you top up it's in a sealed container (2006 plate). His ML500 on the other hand is a different story so glad of the advice!

thanks again from snowy Manchester!
Nabila

Ahh The joys of being a Dad I know the feeling:)

Bill