2004 Citroen C5 various niggles

This is the Forum for all your Citroen Technical Questions, Problems or Advice.

Moderator: RichardW

johnnyj
Posts: 44
Joined: 15 Jan 2020, 17:20
x 5

Re: 2004 Citroen C5 various niggles

Post by johnnyj »

Thanks Mark. The old girl is a bit dinged here and there but overall she is in good condition. Here in Greece the locals just don't see body condition as important. I have seen cars advertised as "Great Condition" but they look like wrecks - what the ads mean is "mechanically great". Out here you regularly see cars driving around with entire panels missing, lights hanging off, or completely covered in dents.

Coming back to the niggles, any idea where I can obtain wiring/circuilt diagrams for my car? I'd like to better understand the central locking circuit. As the interior "padlock" button locks & opens all four doors, but the driver's door lock won't operate what I assume is the same system, I thought I would check the door lock/actuator wiring.

Cheers

John
User avatar
GiveMeABreak
Forum Admin Team
Posts: 25968
Joined: 15 Sep 2015, 19:38
x 2958

Re: 2004 Citroen C5 various niggles

Post by GiveMeABreak »

Hi John, yes, I can put a diagram up for you - check back in a few minutes.

We know the door lock actuators work, as pressing the central button on the dash locks the doors. I suspect that this version may only lock the driver door when using the key blade in the lock with the simple central locking system/ There should be in the front and passenger doors a manual locking mechanism that you can insert the key or similar object in and turn to manually lock the doors if there is a failure of the central locking system. Although you should still be able to unlock and lock the drover door with the key. This is the system on the C3.

So this may be normal behaviour with this version of locking system.

So of the problem is either with the battery /and subsequent resynchronising of the keys or in the comms module under the steering wheel (which receives and interprets the remote frequencies from the fob). So your fobs may be ok and transmitting, but the comms unit part that deals with the receiving is not working.

Image
johnnyj
Posts: 44
Joined: 15 Jan 2020, 17:20
x 5

Re: 2004 Citroen C5 various niggles

Post by johnnyj »

Thanks Marc, I'll work through that over the next few days.

I did take off the driver's door card and have a nose about in there, but there wasn't much to see. It was clear that someone else had been in there, too. One thing I did see was a disconnected wire: could be for a never-fitted option, and it was at the trailing edge of the door, near the speaker lead. It had (I think) a two pin white connector and unlike the other leads it was bound in a slightly odd, err, fibrous sleeve. There was nothing obvious for it to connect to, so I imagine this is a red herring.

Later I popped off the steering collumn shroud, again, just to see if there was anything obvious going on around the comms module you mentioned. Nothing to report here either, assuming I found the correct module - all the connectors were firmly inserted.

If I find a replacement module, is it a plug & play swap, or does it have to be programmed/matched to the keyfob?

One other little job today: the spare wheel well was full of water. Couldn't see where it was coming from, so I will have a search through the forum to see if there are any posts on the subject.

This little project is keeping me nicely busy!

Thanks again for all your help.

Regards

John
User avatar
GiveMeABreak
Forum Admin Team
Posts: 25968
Joined: 15 Sep 2015, 19:38
x 2958

Re: 2004 Citroen C5 various niggles

Post by GiveMeABreak »

The comms units are VERY specific to model, electrical architecture, trim and options fitted John. Part number is 624263 for your C5.

These are a good site for either refurbs or new - I've done the search for you, which shows both: You just keep your original audio stalk, unclip and slide it out and reinsert it in the new module.

You don't have a steering wheel angle sensor to calibrate as you don't have ESP fitted, so should be no need to programme. Just ensure you disconnect the battery first following the BSI Reset / Battery Disconnect / Reconnect Procedure

https://peugeotpartsforsale.com/index.p ... egory_id=0
johnnyj
Posts: 44
Joined: 15 Jan 2020, 17:20
x 5

Re: 2004 Citroen C5 various niggles

Post by johnnyj »

Hi Marc

First and foremost, a big thanks from me for doing that research for me. It is very, very helpful and I am very grateful.

Putting my pragmatic hat on, I am going to get the battery changed first as that seems to be a likely culprit for many of the issues. Once that's done and assuming the central locking problem is still there, I'll order a module.

Thanks again

John
User avatar
GiveMeABreak
Forum Admin Team
Posts: 25968
Joined: 15 Sep 2015, 19:38
x 2958

Re: 2004 Citroen C5 various niggles

Post by GiveMeABreak »

Ok a battery is a good place to start anyway as they don’t last forever and you can at least rule it out for other issues.
johnnyj
Posts: 44
Joined: 15 Jan 2020, 17:20
x 5

Re: 2004 Citroen C5 various niggles

Post by johnnyj »

Hi Marc

I set out to buy a battery today but thought it wise to test mine beforehand, just in case. I borrowed a multi-meter and the readings are 12.75v with the ignition off, and 14.72v with the engine running.

Appreciate this doesn't take into account the battery's ability to deliver a decent current, but what are your initial thoughts to the above?

Best wishes

John
User avatar
GiveMeABreak
Forum Admin Team
Posts: 25968
Joined: 15 Sep 2015, 19:38
x 2958

Re: 2004 Citroen C5 various niggles

Post by GiveMeABreak »

Hi John.

Well those would be normal readings for a healthy battery but of course doesn’t account for how it performs under load and the battery condition of course.

But If you are confident that the battery is ok, then I suspect you may have a faulty BSI. If settings are not being memorised, this would indicate that a chip is faulty in the BSI. When changes are made to the vehicle configuration, they are committed to memory and stored. If you select a radio station and then hold say button 1 down, it should store that station. Does this happen, or are you saying that if you just manually tune to a new station without storing it, that when switched off and on again it goes back to the previous station to the one you tuned?
User avatar
GiveMeABreak
Forum Admin Team
Posts: 25968
Joined: 15 Sep 2015, 19:38
x 2958

Re: 2004 Citroen C5 various niggles

Post by GiveMeABreak »

Another thing to test is with the vehicle switched off, switch on the main headlamps and see if they remain on and don’t dim. If they stay on then this has to rule out the battery. If the radio settings are still missing when you switch the car on again then this has to be something other than the battery.

Another thing is, that it can’t be a matter of the BSI not receiving power from the engine fuse box, because if that happened the car wouldn’t start and you’ll be getting numerous electrical issues and flashing lights on the dash no doubt. So there can only be a situation where there is or there is no power going to the BSI. If there is power to the BSI then I can only think it must be faulty.
johnnyj
Posts: 44
Joined: 15 Jan 2020, 17:20
x 5

Re: 2004 Citroen C5 various niggles

Post by johnnyj »

Hi Marc

When I manually tune to a radio station and hold button 1, it is stored for as long as the car is running. When I switch off the ignition, lock up (ha! see other posts!) and return to the car, the station is forgotten. It is the same for the other settings like language, temp, time etc. The car always defaults to Italian, which I can correct to English, but switch it off and it forgets again and reverts to Italian on the next start-up.

Looks like I have multiple faults - the comms unit for the RCL and the BSI for the memory loss (not mine, the car's)

<edit> I just saw you latest reply - I'll try the lights tomorrow.

All the best

John
User avatar
GiveMeABreak
Forum Admin Team
Posts: 25968
Joined: 15 Sep 2015, 19:38
x 2958

Re: 2004 Citroen C5 various niggles

Post by GiveMeABreak »

Ok I’ll have another look at the audio wiring and see if there is anything apart from the BSI worth checking.
furriegurrie
Posts: 130
Joined: 07 Dec 2012, 16:21
x 9

Re: 2004 Citroen C5 various niggles

Post by furriegurrie »

Is it still the origional radio? Or an aftermarket one? If the latter then maybe the wiring is faulty and the permanent 12V is not connected correctly?
User avatar
GiveMeABreak
Forum Admin Team
Posts: 25968
Joined: 15 Sep 2015, 19:38
x 2958

Re: 2004 Citroen C5 various niggles

Post by GiveMeABreak »

Yes, good point, I’ve assumed original of course, but should of asked.
johnnyj
Posts: 44
Joined: 15 Jan 2020, 17:20
x 5

Re: 2004 Citroen C5 various niggles

Post by johnnyj »

Very much the original radio, built-in to the fascia.

John
User avatar
GiveMeABreak
Forum Admin Team
Posts: 25968
Joined: 15 Sep 2015, 19:38
x 2958

Re: 2004 Citroen C5 various niggles

Post by GiveMeABreak »

Ok John, so one thing you can try for me. Go into the driver's side compartment under the dash on a left hand drive. There should be a small flap that drops down. This is where the BSI and the internal cabin fuses are located.

On the BSI, there will be one particular fuse we are interested in. It's called the Park Shunt Fuse and has 2 possible positions. In one position it will be APC+ which will only allow things like the radio co come on when the car is running or when the ignition is switched on. If it is inserted in the other position, supplies are wired to the battery permanent.

I suspect the Park Shunt fuse has been removed for testing at some point and inserted in the wrong position, and this is why some of the systems are not getting power once the ignition is switched off and also why the settings are not being stored :-D

So here is a diagram of the fuse in question (click diagram to magnify)
C5 BSI Shunt.PNG
It is a 30A Fuse 19 / 19 (a).

Position 19: When it is in position 19 shunted to the right, it is in transit position and cuts permanent supplies to locking and Audio and internal lighting systems as examples.

Position 19(a): When it is in Position 19(a), shunted to the left, it is in the normal Customer Position and allows a permanent 12V supply to certain equipment as mentioned above.

I think this is is the solution to your issues.