Central locking only works inside the car??? plzz Help

So you would recommend changing com2000?

Well, yes, but its no guarantee that its going to fix it, just an educated guess, for example - You could have 2 faulty keys, but this is unlikely, but not impossible.

The option of some diagnostics could make the diagnosis more positive to which bit needs changing and I will look into this for you.
(I looked on my lexia and for a facelift model car it does show an option to talk to the 'High Frequency Transmitter' which I would think is the remote central locking. This is good news as there may be some information about signal strength or interference that could diagnose the fault better). I will see if I can get more information during the daylight hours.

Changing the com2000 is a bit involved. You need to remove the air bag to get the steering wheel off, then you can get the com2000 off. You must disconnect the battery and leave it for at least 30 minutes before removing the air bag. Put the air bag somewhere safe (not in the car), safe as in, if it goes off accidentally then no one is going to get hurt.

some tips for disconnecting and reconnecting the battery safely

Battery Changing Procedure:

Open the drivers window and the bonnet.
Close all the doors, switch off everything, like the radio, phone charger etc.
Remove the ignition key via the open window
WAIT 10 minutes
Disconnect the battery.

(do the job that needs the battery disconnected)

Reconnect the battery,
WAIT 1 minute
Keeping the doors closed, lean in via the drives window
Switch on lights
Then switch on 'ignition' and start the car.

Check the electric windows don't need resetting, the radio reprogramming etc.


There is no mention of having to get the com2000 coded to the car, luckily.

C3CAR wrote:

So you would recommend changing com2000?

Well, yes, but its no guarantee that its going to fix it, just an educated guess, for example - You could have 2 faulty keys, but this is unlikely, but not impossible.

Perhaps I should have said trial and error rather than implying changing the Com module WILL be the solution. As C3CAR says. its an educated guess. With many electronic modules it can be more expensive to get them repaired than to replace them; that's if you can find someone to even attempt a repair and that the parts to carry out the repair are available. Nearly all the electronics that Citroen use are from a third party supplier, the chances of them parting with circuit diagrams and technical information are next to none.

Unless you fall really lucky with a error code that confirms the diagnosis you have to start trying different solutions. There are quite a few topics on this website where cars have gone to the so called 'experts' at a dealer garage and they have gone through the process of swapping out parts because when it comes down to it, they're not electronic systems engineers and don't have the knowledge or equipment to diagnose the electronics beyond the error code that their computer may or may not provide. Don't get me wrong, I'm not saying garages don't know their stuff, just that when it comes to the electronics, its a highly specialised field.

I may be wrong but in this case I would suggest there won't be a error code. Its extremely difficult to measure the gain of a circuit by remote monitoring, all the BSI will look for is communication with the Com module. We know its working because you can lock and unlock the car, even if it is at very close range.

There is a post about a key fob with short range here

and in the post -

eastonch wrote:Key Fob

Sorry for ranting on guys, but I'm a perfectionist, I knew this car was a little bit of work, and I'm making myself a list of things to do before Ihead off to uni and need to work on it down there.

I have two keys, one of which, doesnt work, only one button does, and from a very short range.

and the solution for Chris turned out to be

eastonch wrote:KeyFob working! -- Replaced battery in one of them and everything is fine.

and to fix the one button working

eastonch wrote:Thanks, fixed one of my fobs just buy opening it up and positioning everything, think the button had 'slipped' works fine after a battery replacement too.

I know the batteries have been changed already, but maybe they were old ones or ones from the 99p shop? What I am trying to say is that a new battery that is low on voltage gives the same performance as an old battery that's low on voltage.

You can't beat Duracell 2016 Lithium Batteries from Amazon for early cars and their Duracell 1620 Batteries for the later cars. Its just a thought and could save a lot of expense by just double checking the batteries.

Arfur Dent wrote:I know the batteries have been changed already, but maybe they were old ones or ones from the 99p shop? What I am trying to say is that a new battery that is low on voltage gives the same performance as an old battery that's low on voltage.

Very good point and well worth trying for the cost of another set of batteries.

I had a quick look online, because I didn't fancy taking my com2000 off the car to look

This one was off a pug 307, and looks very similar to units fitted to the C3.
I have added some white arrows to mark the parts that indicate (to me) that there is a low power, high frequency radio transmitter on the circuit board inside the com2000 unit. I am very confident that the remote locking/unlocking transmitter/receiver is found in the com2000 unit. I am not suggesting fixing the board, rather just change the whole com2000 unit.
There were several different manufacturers and many different version revision and options of the com2000 but they all do very similar jobs and work in a very similar way. from https://www.glodark.com/peugeot-307-horn.htm - Thank You glodark.com

backup link:
https://web.archive.org/web/20200126210 ... 7-horn.htm