Remote fob locks but won't unlock.

[Snowyjoey]

Hello everyone. First post here, so I'll try to be clear (apologies if my question is too long).

I have two keys with remote fobs, both original, for my 2015 E-class e220 estate.
Remote 1 works fine in all regards; locks car, unlocks car, opens tailgate and starts the car.
Remote 2 used to be the same as remote 1. Now, remote 2 locks car, opens tailgate, starts car, but does NOT unlock the car.

Since remote 1 works 100%, it seems unlikely that this is an issue with the vehicle? I've changed the battery in remote 2, but that made no difference. I followed some advice online about re-syncing the key fob to the car (there seem to be a few variations to the procedure out there) but this did not have any effect either.

Any advice on how to solve this without shelling out the kids inheritance on a new key from the main dealer?

Thanks for reading this far

 

[Diesel Benz]

No need to re-sync a 2015 MY car key. Sounds like the issue is on the key switch for unlocking the car.

 

[colinallcars]

Hello everyone. First post here, so I'll try to be clear (apologies if my question is too long).

I have two keys with remote fobs, both original, for my 2015 E-class e220 estate.
Remote 1 works fine in all regards; locks car, unlocks car, opens tailgate and starts the car.
Remote 2 used to be the same as remote 1. Now, remote 2 locks car, opens tailgate, starts car, but does NOT unlock the car.

Since remote 1 works 100%, it seems unlikely that this is an issue with the vehicle? I've changed the battery in remote 2, but that made no difference. I followed some advice online about re-syncing the key fob to the car (there seem to be a few variations to the procedure out there) but this did not have any effect either.

Any advice on how to solve this without shelling out the kids inheritance on a new key from the main dealer?

Thanks for reading this far

Possibly the unlock switch on the fob has failed. If you’re good with a soldering iron it’s a diy job with a new switch from eBay, if not, a car key specialist will be able to do it. For example :

For Mercedes Remote Key Repair 2 Micro Switches Height 3.5mm L 6.2mm W 6.2mm | eBay

These are high quality micro switches and areideal if you need to repair faulty switches on your remote key. Micro switches can be replaced using solder iron.

www.ebay.co.uk

 

[Snowyjoey]

Thanks for your replies @Diesel Benz and @colinallcars. Your opinions coincide with my instincts, so I'll follow up with the eBay link you've sent.

Thanks again

 

[colinallcars]

Thanks for your replies @Diesel Benz and @colinallcars. Your opinions coincide with my instincts, so I'll follow up with the eBay link you've sent.

Thanks again

That’s just an example, you’d need to make sure you get the right one for your fob.

 

[Gallon]

Had the same problem on a W204 key fob some years ago. Dismantled the key & sprayed the faulty switch with IPA (Isopropyl alcohol) which can be used for electrical contact cleaning. Then operated the switch a number of times, problem solved. Was still working fine some years later when I sold the car. Might be worth a try.

 

[Snowyjoey]

As OP, just following this up for the benefit of any other readers: I used the link @colinallcars posted (Repair Service for Mercedes C E S G Class ML CLK 2 or 3 button remote smart key | eBay) and sent the key away for repair, as I wasn't brave enough with my soldering iron. Quick service and for £60-odd problem all solved.

Thanks all who took the time to help me out and respond!

 

[AB65]

Cannot recommend 'Car Key solutions' enough!
When I bought the car, it only had x1 key (negoiated into purchase price) however, my concern was security (what if the 2nd key was still 'active'?) These guys were brilliant. First came to house to collect 'ionfo' from car. Then key ordered from Germany and programmed to suit, which also 'deletes' any previous keys, rendering them useless. Whole deal was £410, but may be cheaper for different models? Just Google 'Carkeysolutions' if needed!