I gave up the Lexia so this is the alternative:
This is a brief instruction of installing a cheap universal remote kit for locking and unlocking the doors on your C3 in case the original sender is broken.
First of all you have to order a kit like this:
https://www.ebay.com/itm//262905500812?
If this link is dead, search for "Remote Car Control Central Lock System" on ebay.
As you see, they are not expensive, less than £10 - shipping included.
Next step, remove the stereo. You might need a tool for that like two hooks that will be used in the 4 holes next to the stereo.
After that, pop out the locking button on the dashboard. There are 4 small plastic flaps that you have to push gently with your fingers from the inside, then it will come out.
Remove the button from the connector.
Now concentrate on the two cables as seen on the picture. Take a sharp knife and remove the plastic on the cables until the leads will be exposed.
Check the (crappy) manual to the remote kit. In best case you can see that there are two relays there, independent of each other. Leads 1-6 are usually connected to the two relays. Pick one of them and the two cables that is in the open state. If you not are sure: just test. You can't break anything - neither of them has +12V or ground, they are just open relays.
In my case: white and yellow. Hook those to the exposed cabels and solder them permanently. Seal or cover it with tape.
The box also needs +12 and earth. In my case I found +12 in the fuse box as seen on the picture. I took an old fuse and modifyed it for this purpose.
Remember that some +12V will drop if the car goes in to Economy Mode.
Earth was taken from the nut just over the fuse box.
Thats it!
Now you can toggle lock/unlock by pressing the top button on any of the remotes. None of the other buttons will have any function.
Well, you will not have the flashing confirmation as when you are using the original sender (or key) but I think you can live with that.
The red LED on the button is flashing when the car is locked.
I've noticed one thing: if the car has been locked using the key, unlock with the remote won't work.
Oh! One thing: The old sender have to be present since it has the immobilizer chip.
I have a C3 2008 but I think that this will work on a number of cars that has this locking button.
And for £10 it can be an option in stead of buing a spare original sender för £150-200. You'll get two senders here as well.
Sorry if my english isn't perfect.
