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Body Control Unit (bsi)


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#1 tonywalsh

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Posted 05 September 2008 - 04:13 PM

Can anyone tell me where this unit is located on a 51 plate C5 Hdi (110)?
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#2 techbod

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Posted 05 September 2008 - 05:03 PM

what ECU are you looking for/?
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#3 Randombloke

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Posted 05 September 2008 - 05:55 PM

Can anyone tell me where this unit is located on a 51 plate C5 Hdi (110)?


Lift up the bonnet, look to the right hand side (as you look at the engine), it's under a cover, just behind the battery. Lift up the cover, you'll see a number of multiway cables and an ECU. That's it.

HTH.
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#4 tonywalsh

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Posted 05 September 2008 - 06:03 PM

Sorry,
it's the Body Control Unit I need, but thanks Randombloke, most helpful.
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#5 Johndouglas

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Posted 05 September 2008 - 06:04 PM

The plugin is at the back of the glove box, behind a pull-out cover.
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#6 tonywalsh

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Posted 06 September 2008 - 04:44 PM

Mmm. Bit of a mystery now! Assuming I'm looking at the correct unit which is the one to the left of the fuse box under the bonnet, it bears no resemblance to the picture posted on BBA reman site. Is there more than one type of Body Control Unit? My car is a 51 plate C5 Hdi 110 estate. The BBA picture has all manner of muti plugs on the top of it. The unit I'm looking at is a metal bodied box with three (I think) multi plugs at the rear.
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#7 kfk

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Posted 06 September 2008 - 06:06 PM

are you looking for the control unit thats responsible for the suspension......or the BSI?.....if you want the BSI its hidden behind the glove box
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#8 techbod

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Posted 06 September 2008 - 06:07 PM

http://images.google...l=h...l=en&sa=N

not sure where it is at the moment but ill have to check my data to see if its in there
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#9 Randombloke

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Posted 06 September 2008 - 07:43 PM

My manual from RTA mentions the BSI in the cabin, with the leads in the glove box behind the cover, and the BSI also in the engine bay, and another BSI for suspension.

BSI means Boitier de Servitude Intelligent.

This applies to the ECU in the glovebox, the engine ECU in the location I have mentioned, and also the ECU for the suspension located lower down on the RHS of the engine bay, bonnet open facing the car.

The BSI mentioned in the suspension context takes input from brake and clutch and sends output to the main controller for the suspension.

Why not simply tell us (kfk actually, as he has the real life experience) what the problem is and why you are looking for the ECU in question?

The provided link looks like a controller for interior functions in the car.
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#10 tonywalsh

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Posted 06 September 2008 - 08:22 PM

Ok many thanks so far. Forgive but I was trying to shortcut through a fairly long sequence of faults. But here goes! Some weeks ago the rear windscreen wiper began to exhibit a fault. It swept 3 times when the central locking plipper was operated when opening the car. It repeats that fault after a short (maybe 3 or 4 mins) delay when any door is opened. It also does not park, simply coming to rest wherever it stops. The intermittent wipe also does not work and the same 3 wipe sequence happens when you operate from the stalk. 2 days ago the tailgate lock refuses to open either from the gate handle or from the interior button, the only recourse is to use the screwdriver in the hole trick to open the gate. All other doors work ok with the key fob or from the interior locking button. Yesterday I had a diagnostic from an indy auto electrician who tells me that the fault is with the Body Control Unit (BSI) but this can only be fixed by the main dealer since it is coded. On investigation I found a BSI reset sequence which it seems would be worth a try. Done that but no improvement. I've also discovered that I can get a reman unit for 125 on line by sending my old unit to them which is then returned, refreshed and avoiding re-coding and what I understand would be a bill many hundreds more. I'm not an auto engineer, but I am an engineer and electrician so naturally I am happy to have a go. But I will be guided by all of you who are more expert than I am!
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#11 kfk

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Posted 06 September 2008 - 08:32 PM

Whilst it isnt impossible for the BSI to become faulty i would doubt very much if this was the cause. Reading forums will often guide people to replacing or suspecting faulty components when in fact it is something far more simple.....and ussually cheaper.

Before you start replacing/spending major amounts of money i would check the wiring at the tailgate hinge and see if the earth wire has broken due to fatigue caused by years of opening the tailgate.

I appreciate you have had an auto electrician look at the vehicle and condemn the BSI.....but he isnt the one who is going to be presented with the bill.....he's even told you it will need to go to the dealer for programing.....which is correct......but has he disconnected it and checked the wiring for continuity between BSI and tailgate?

Do your self a favour......have a quick check of that wiring....you might save a few quid.
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#12 tonywalsh

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Posted 06 September 2008 - 08:43 PM

Wise and perfectly sensible words kfk! I will of course do that tomorrow. It doesn't explain the behaviour of the wiper though. I must admit I can live with that fault but the tailgate failure is a real problem since I work out of the vehicle and open the tail umpteen times a day, that alone could bolster your theory of wiring problems!
Many thanks for now and I'll update when I find something.
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#13 kfk

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Posted 06 September 2008 - 08:48 PM

one broken wire and it will try find and earth wherever it can........ how many times have we followed a car with an indicator flashing and the whole light unit flashes with it.
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#14 tonywalsh

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Posted 06 September 2008 - 08:52 PM

Absolutely true. I'll attack it tomorrow and keep you posted.
Many thanks.
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#15 tonywalsh

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Posted 07 September 2008 - 05:01 PM

Absolutely spot on kfk! 3 broken wires inside the flexi boot at top of tailgate. Did try pulling them the other day but didn't reveal the problem. Stripped it down and hey ho. All absolutely 100% now.
Most grateful for all the suggestions and help.
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#16 techbod

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Posted 07 September 2008 - 05:43 PM

got my software running including the images, awesome stuff this is but to a none tech its worthless :(
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#17 kfk

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Posted 07 September 2008 - 05:51 PM

Absolutely spot on kfk! 3 broken wires inside the flexi boot at top of tailgate. Did try pulling them the other day but didn't reveal the problem. Stripped it down and hey ho. All absolutely 100% now.
Most grateful for all the suggestions and help.


Glad you got it sorted and gave us the out come.....always nice to know when there has been success.
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