Is the wiring loom fitted to your car the correct one to enable full functionality, or have you swapped the loom from the donor car?
Most of the accessories are VAN not CAN communication on the Ulysse and you can retro fit the extras, Clicky has proved you can by changing his RT3 N1 system to the RT3 N3, he had to use Lexia to make the changes in order to get it working as well as splicing a few wires.
At worst if the BSI can't be re-programmed, the donor one (with the possibility of the engine ecu & com2000) could also be fitted. But I still think it needs enabling to "present", for example when I hook up a Ulysse and navigate the menus in Lexia you will see all the optional extras but are disabled e.g. sunroof, headlight washers etc.
Got loads of them, you'll need to get Clicky to help you with the wiring though, the rest is simple enough.
peugeot description is 'anti crush cut off ecu'. However, on the donor i have, wires go straight from this module into the sliding door node. and also straight to the centre pillar contact plates. when i changed these from my original plates, it added an extra 2 contacts at the top, obviously to accommodate the door release and sensor. these are the two wires.
haven't had a chance to look at mine yet today, but i will either track the two wires from the node to see where they go, or the wires from the pillars. hopefully they'll lead me to a hidden unused connector already in the loom, as in the donor.
but i doubt it lol