Defect in key fob help

[Rosy oli]

Please help, my key fob for Mercedes A class 1.5 is playing up, it unlocks but doesn’t lock, I don’t know if it’s key battery or button or something else? Please advise what should I do??

 

[Mike Smith]

Try a new battery in the fob, easiest and cheapest first step.

 

[John Laidlaw]

Welcome and this ^

 

[EmilysDad]

What about the other key?

 

[CowleyStJames]

Try the spare key. If it locks and unlocks on that, probably button fault. I'd suspect battery if neither worked on the first remote, but why should it unlock but not lock if battery faulty

 

[Wighty]

One of the forum members is a key repairer "johnnysbc"

 

[Blobcat]

Hello and welcome

 

[Rosy oli]

Try a new battery in the fob, easiest and cheapest first step.

Thank you, but unlock button works and lock button doesn’t work can it be battery issue

 

[Rosy oli]

What about the other key?

I don’t have a spare key, I am locking my car manually at the moment.

 

[Blobcat]

Is the top of the lock button cracked or broken? If so moisture can get in and corrode the contacts.

 

[Rosy oli]

Try the spare key. If it locks and unlocks on that, probably button fault. I'd suspect battery if neither worked on the first remote, but why should it unlock but not lock if battery faulty

I only have one key fob and spare key from key fob works fine, I can close manually it’s lock button not functioning at all, do you recon it’s battery issue??

 

[Rosy oli]

Is the top of the unlock button cracked or broken? If so moisture can get in and corrode the contacts.

There is no such sign, it looks all good, any advise?

 

[CowleyStJames]

No. I'd suspect micro switch inside key.

 

[joderest]

as above, try a new battery and re sinc first, if that does not work then either key faulty, or control unit faulty.

 

[alexanderfoti]

No. I'd suspect micro switch inside key.

Me too.