C3 Picasso BSI Question

[Bargeman]

Hello, I've searched and can't find the information i'm looking for, if i've missed it, I apologise for asking again.

Citroen C3 Picasso Executive 2012 1.6 DV6DTED engine. We Live in France, in the UK for family visit.

Fuse Box / BSI - VALEO 9667199780

Retired maintenance engineer, undertake all of my own servicing (at 70 years old some heavy work I have to pay for).

UK Pensioners - Hating the thought of Main Agent invoices, one said £1000 plus as an estimate.

Air conditioning stopped working - I thought "Regas".

A few days later the Parking Sensors stopped working.

A/C Specialist (Independant) vehicle only, tested gas level, good. Diagnosed compressor faulty, new required. booked it in.

Compressor changed - regassed - clutch not energising - He "Checked continuity from the fuse box to clutch - OK", and applied 12v from another source - clutch engaged A/C got cold.

He did an OBS test - "Air Con Clutch Control Fault F994" + "Front driving light fault" (only one working - I thought bulb failure) + "Oil level indicator fault "- Dash indicator working (confirmrd by dipstick). "I think its the BSI, I can't go any further, you need a Citroen main agent". Both Fog (Driving lights) came on next day when I swithched them on - I've got 2 spare bulbs now haha.

Phoned round - got an appointment for a full diagnostic check - Workshop Controller phoned evening before appointment "Electrician on the sick, whats your problem?" Described above. "If I were you I'd change the BSI, they get water in them, weve changed lots" - I can't get another Citroen Agent diagnostic appointment for months - will be back in France early July (Hot, very)

I have brought a Carsoft OBS with specialist PSA Chip for own use.

I ordered a BSI from Citroen Centra spares - Zero stock - Found NEW one on ebay - Appproached two "Cloning Services", both said "Cloning not neccesary its Plug and Play".

I Changed the Fuse Box / BSI this morning - No change to above, Air Con clutch not operating. My OSB reader reads "Air Con Clutch Control Fault". No other faults.

Niether OBS readers mentioned Parking sensor fault which is still there.

Sorry that was so long, so questions are.

Is it correct that the Fuse Box / BSI is Plug and Play?

Can anyone help with a wiring diagram / Cable colours / BSI pin identification of the positive conductor feed from the BSI to the clutch - I assune that the negative goes to a central "Earth" Neutral point, as there is only a Positive feed from the Mega Fuse to the BSI. (All fuses are OK) - A/C button illuminates and fan goes to full speed when "Auto" is selected.

I'm in South Wales at the moment and will be in Lincolnshire and Staffordshire next week. Is there anyone who might help with any diagnostics?

I would really appreciate any comments that will help me to restore A/C control, we will melt without it over July and August. This might sound stupid, but if all else fails, in desperation I am considering wiring a fused supply via a manual dash mounted switch to the clutch coil with the high pressure switch in series if I have to. but with the help of the wisdom of the forum members, I'm feeling confident that this will not be necessary.

Thanks in advance

[RichardW]

I think you've got terminology a bit confused:

BSI is the inside fuse box / controller which DOES require coding.
BSM is the underbonnet fuse box / controller which does NOT require coding.

I suspect you have changed the BSM? Are you sure it was the right one, there are loads - best to go off the number stencilled on it.

It may be that you need to clear the fault, as if it thinks there is a short it may not energise the circuit. I would also want to re-check that the wire is not broken between the BSM and compressor.

[Bargeman]

Hi Richard

Thanks for your quick reply.

Its not just my terminology thet is confused, my head is also, learning a new subject while sorting out the funeral of a family member doesn't do the old grey matter a lot of good.

I have indeed changed the under bonnet Fuse Box, which is definately what I was directed to by the Citroen Agents Workshop Controller, who distinctly described it as being to the right of the battery next to the ECU, which commonly had water problems. I was convinced that he refered to it as the BSI, Drrrrr

So I have a pretty new BSM . Yes, I'm sure that the part numbers were a perfect match, same value fuses in the same positions, identical twins.

It was from here that I was under the impression that the AC clutch coil got its feed. But I am more than happy to be educated. Having said that, I did think that the thicknes of the case was slim if it had to contain a PCB and relays (I assume that there will be a relay as the load will be a bit heavy directly from a PCB).

Ive just spent 1/2 an hour with the OBD reader (I typed OBS Before - I said my head is confused hahaha).

I have faults showing under two "Sections" that will not clear. All other "Sections" are showing "No Fault Code", Including funnily the Airconditioning "Section".

They are

Section - Built in System (BSI)
Fault - "State: Not Charachterised - Oil Guage Fault"

Section - Engine Relay Unit
Fault - "State: Not Charachterised - Aircon Conpressor Clutch Contrtol Fault - Erasing faults linked to theis ECU can only be accessed by the BSI"

The OBD Reader Identifies the BSI as

"BSI 9664058780
Valeo
VIN ****************7
Software 11.50
Software Reference 77245
Type of BSI DEVELOPED"

Interestingly the first thing that I checked was fuse F4 - 10A in the BSI (Inside fuse box) as the handbook tells me that it feeds "Airconditioning" as well as othe functions.

Rechecking the wire between the BSM [got it right ] and the compressor is where I was hoping to go. Hence my request for information on Plug Pin Position, Wire Colour, Wiring Diagram to assist me to identify which wire it is. there are dozens in the three plugs, also if I can identifty which male pin it is I might just be able to see if 12V is being supplied.

This is the fist time I've ever had to get involved wit CAN BUS systems in any form, I'm old school, cable (through a fuse) to a switch, then on to a motor / lamp etc. sometimes to the coil of a relay. I was and still am more than happy to pay someone if I could find one. Especially as I have nowhere to work other than in the gutter of a busy road.

[Bargeman]

Update - Solution

Ive learned a lot in the process. It was long and tedious - I will keep it brief. This may help someone else in the future.

After being 100% sure that it was not a wiring fault - as was the diagnosis of the electrician at a Citroen Main Agent after a diagnostic check. He then advised that I make a new "small loom" to replace the original wiring. This I did, checking and re checking continuity as I went.

The A/C compressor clutch is energised by 12v being supplied from Pin 1 of the Yellow sockey in the Engine Bay Fuse box / Relay unit. Via a blue wire.

The Compressor Loading Valve supply is fed from the No. 3 pin of the yellow socket Redish pink wire.

The Negative return is combined via a splice to pin 5 and is yellow and Green like a domestic Earth connection.

On initial loading the Clutch and Loading valve should show 12v (14.4) when tested to the "Earth" of the car.

The "Earth" -ive path from Yello 5 through the fuse box / relay unit connects to a body "Earth point" via wires exiting through Pin 26 of the GREY socket.

On testing for continuity through the Fuse box, I found that there was none. There was continuity from the Plug 26 female to body earth.

A new Fuse Box - in a PSA sealed box was purchased from an eBay outlet for £110.

I checked for said continuity through the new box - BINGO.

Swapping the Fuse Box over took under an hour and Hay Presto controlling Air Conditioning. Yesterday in France it was 38C, and it keeped the interior at a very comfortable temperature.

Paul Hayes

[GiveMeABreak]

Thanks for your update Paul.

[nisseniskogen]

Hi , Thanks for good explanasion, Maybe you can help me .. I have the same problem, and allso the same obd error. ( oil , front bean ,and ac clutch) I have try new bsi ( under bonnet fusebox) But no change. Did you change the bsm ( fuseboks innside the car )
Hope you have some good tips ..


Mvh Arne Bjørnevoll. Norway

[xantia_v6]

You seem to have some confusion. The BSI is the fusebox (and computer) inside the car, and the BSM is the fusebox in the engine bay.