Hi guys my key fob is not working to lock and unlock my car it's was yesterday then suddenly stopped yesterday night I was something to do with switch ignition on off some many times may reset it has anyone got any ideas if so please explain in full what to do thanks

Have you tried replacing the battery ?

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Yer done all that mate

This happened to me some time ago, replaced the fob battery and no joy. I reset the GEM using ELM config tool and that solved the problem. Perhaps disconnecting and then reconnecting the vehicle battery would reset the GEM if you don't have ELM config or a lead?

have you tried this

1. NOTE: The ignition must be turned to position II exactly four times during remote transmitter programming.

   Turn the ignition switch from position I to position II four times exactly within six seconds.

1. Turn the ignition switch to position 0.

1. An audible chime will be heard (only in vehicles built before 2008 model year) to indicate that it is now possible to programme the keys for ten seconds.

1. Press and hold one of the buttons on the remote transmitter until a chime sounds. This indicates a new transmitter code has been successfully received.

1. To program additional transmitters, repeat step 5.

1. The system will leave the learning mode after the ignition switch is turned to either position II, or if no new transmitter is programmed during the 10 seconds, or if eight remote transmitters have been programmed.

Hi I have no idea what any of that is by have been told that if I take both cables out of the Siemens Central locking box for an hour it resets it but I can't find the box I was told its under dash drivers side but I can find it so I have to remove any things as I have had the under side of dash off but no joy

thats the mk1

Yes iantt I have and didn't work dunno if that's because mines a 2008 have tried that

Ahh that could be why i couldn't find it is there any thing else I can try but I'll give your idea another go do I have to remove to key before I try it every time or lock and unlock the car every time ?

the 2008 is the same except for the chiming noise entering programming. as you have tried that , and i assume you have fitted battery the right way round, then that leaves the remote is broke or the gem module is faulty,( or rf reciever faulty,but not sure if you age has one and rf could be part of gem module)

have you just the one remote key?

Sorry if I have created some confusion :( will try and explain. The central locking in a MK2.5 is controlled by the GEM (generic electronic module) which in addition to the locking, controls things like wipers, indicators and many other things. The ELM config tool is software runs on a laptop connected to the service port with a lead (ODB lead) which is a socket located in the panel under the headlight switch. You can carry out operations like read fault codes or reset modules. For me, resetting the GEM using the lead ELM config tool solved the problem.

It may be that if you don't have an ODB lead or are not comfortable using the ELM tool, that disconnecting and reconnecting the vehicle battery will reset the GEM, but it will mean you have to enter the stereo code again.

Remote was working fine when locked car yesterday went into a shop and was back to car with in 20 mins and then wouldn't unlock again and yes only 1 remote key batter is + side up

I will have to disconnect the battery and try that and I don't have the leads or knowledge to much about with codes and stuff and I don't have a standard CD player in I fitted a 7" after market screen that fits direct to where standard CD player goes which does not request a code once reset

does the central locking work the doors with the key in the door lock?

Yes if I use key to unlock car all doors and boot open just can't use remote to do it

have you tried putting the battery in the other way round and trying it, im not saying it is the wrong way round but , i had to sort some remotes out another garage couldnt fix and they had both remote batteries in the wrong way, i cant remember which way they should be,

next will be take remote to a locksmith and get them to check the remote is transmitting, they will have a remote checker