Key Fob not working

I've just bought a c3 diesel 2002 and when I got it both buttons on the fob worked. Then the fob stopped opening the door but would still lock it. Now it won't do either and I'm left with my back doors and boot unlocked and no way to lock them. I have checked the battery in my fob and it's all good so can anyone suggest what might be up with it?!? Thanks!

NeroAngel wrote:I've just bought a c3 diesel 2002 and when I got it both buttons on the fob worked. Then the fob stopped opening the door but would still lock it. Now it won't do either and I'm left with my back doors and boot unlocked and no way to lock them. I have checked the battery in my fob and it's all good so can anyone suggest what might be up with it?!? Thanks!

Hi NeroAngel, I would think you have a faulty fob, probably the switches on the fob or the plastic button is worn.

Try operating the remote lock/unlock with the board removed from the key.

Also feel the switch while its being depressed, while its out of the case, feel for a definite 'click'.

There is some information about the fob internal components here https://citroenc3owners.com/citroen-c3-t ... -t449.html


There are some places that can test the fob for a signal, which would prove or disprove the switches.

Let me try to help on this issue...

I have bought a Diesel C3 in a really bad condition, the FOB was only one of the problems, so here's what I have done:

Open the key plastic cover and inspect the switches. If you don't hear the click when you press the center you may assume it's dead. Check both regarding the clicks. Please be sure that the battery is not dead (yeah, I know, but I once knew a guy who happened to be checking a dead battery... ).

Get a little bit of wire and apply the wire tips to both sides of the switch, shortening the contact. Id the board is OK, the door locks will come alive and will work. Apply the wire to the soldering on each side at the same time. Mine worked (the board was ok). I bought 2 switches (really cheap) on ebay (an english trader, btw) and soldered them to it's places in a couple of minutes. My plastic key cover was a mess, so again I went to eBay and bought a replacement for about 3 euro. It took ages to arrive but within minutes I was the proud owner of a working FOB.