Locked-out of my W203 C240 in the cold

[Dave_G]

Hi All

I have a really annoying problem in that when it's cold outside, the remote keys on my 2000/X C240 (w203) won't respond and I have to use the emergency key blade to get in. This naturally sets off the alarm, and even when in the car and I insert the main key in the ignition, it won't always release. I thought it might be the battery voltage a bit low so I changed the battery and it was OK for a day or so. Eventually, it'll unlock and I can re-sequence the infra-red part of the keys again and it'll be fine for a few days. Both key batteries are new. It's driving me mad!!!

Any help would be greatly appreciated.

Thanks

 

[scubacrazy]

Hi Dave,
How did you re-programme your key, as mine needs doing after having the battery disconnected.I have a2001 c240 W203, and I am a little confused !
Your help will be appreciated.

 

[television]

With the DAS keys try pressing any button and inserting it in the ignition within 5 sec.

When they fail to turn try leaving in the ignition switch for 90 mins