Another way of re-booting the BSI

[oldman]

This is another way of re-booting the BSI from www[dot]askthemechanic[dot]co[dot]uk/makes/citroen.html.

BSI LOCK UP
Citroens and Peugeot are fitted with a BSI (Built-in System Interface/multiplexing unit) this is a computer that controls the wipers, immobilizer etc. This can lock up like your PC, all you need to do is to go to the fuse box and look for the shunt fuse (see picture) remove it for 10-15 minutes and it should reset.

Is it a safe way of re-booting the BSI?
I am aware of the other way, but this seems much easier and simpler.

Why am I not allowed to use the url tag? Just had a warning message saying that I was not allowed to post urls! Am I on probation, being a new member of the forum?

[gazza82]

Some forums restrict posting urls to stop spammers ...

[IanL]

The shunt method as described is wrong, because it does not shut down the BSI correctly.

The approved method (bonnet open, all doors closed, driver's window open, turn off ignition through window, wait 3 minutes, then disconnect battery) ensures the BSI is shut down in a particular state, from which it will reboot without problems. To do the shunt in the fusebox, you would still need to get the doors all shut, turn off the ignition and sit in the car for the 3 minutes before removing the shunt. Six of one and half-a-dozen of the other, imho.

Btw, once the power has been removed (battery connection or shunt) it is only necessary to wait 10 seconds before re-connecting. See http://www.bba-reman.com/content.aspx?c ... ot_process

[oldman]

Thanks for the replies; I was hoping for more.

The reason for my original question is, my car needs the battery charging and the car is parked outside, where the public can get access. So I need to remove the battery from the car and leave the car secure.

I have taken the battery off and charged it in the past, before I was aware of the potential damage that could be done to the BSI, but the last time I removed the battery, the display was showing "economy mode active".

I have now tried the fuse method and it cleared the display of "economy mode active". I synchronized the key with the BSI and was able to start the engine, which ran for 2 seconds and shutdown, due to another fault (Anti-pollution fault) that I have with the car.

The battery is now too low to effectively turn over the engine.

I am still uncertain as to what will happen, if I pull the fuse out and then open the door; will the BSI remain in sleep mode, or will it be woken up when the door is opened!

Thanks for any replies.

[IanL]

Well, I've looked up the circuit diagram of the BSI, and the shunt only powers F4 and F5 (does not include the doors), so most of the services (including, I assume, the BSI processor) are unaffected by pulling the shunt.

F4 includes the display, which explains why you stopped seeing the economy mode message. It does not mean the BSI processor was no longer active.

Seems like a bad idea to me.

What I suggest you do to meet your security requirement is to close everything except the bonnet, sit in the car, turn the ignition off, wait 3 minutes and then remove BSI connectors 2V GR and 2V NR below. This will remove all power from the BSI, so it should, as far as the BSI is concerned, be the same as disconnecting the battery. You should then be able to exit and lock the car with the key. Then you should be able to safely remove the battery.

To reconnect, open the car with the key, open the bonnet, replace the battery, get in the car and close all doors, then replace the BSI connectors. Then turn the lights on.

That should work, but no warranties expressed or implied

[oldman]

Thank you very much IanL for the detailed reply. Two questions, is the diagram of the same fuse box that the shunt fuse is located in? The line pointing to the 2V GR plug in the diagram looks like it crosses over the shunt fuse, is that correct?

Many thanks for your help.

[IanL]

...is the diagram of the same fuse box that the shunt fuse is located in?

Yes, the fusebox in the dashboard.

The line pointing to the 2V GR plug in the diagram looks like it crosses over the shunt fuse, is that correct?

I think so. In any event, the colours will prevent confusion

GR=Gris=Grey

NR=Noir=Black

[oldman]

I looked at the fuse box/BSI unit and I noticed that the cables to those plugs had very little slack (it looked like it would have been hard to get the plugs back on again), so for that and other reasons I did not attempt this method. I instead got a neigbour to sit in the car with the window shut, to pull the key out and stay there until I had remove the battery terminals. But thanks for the suggestion.