C5 X7 trailer connection status missing

[danijelsuvajac]

i managed to find the towbar module and i have partial wiring.
in the trunk I have only one connector with four thin wires and one thick like the one in the picture

I guess BSI got power and commands from that connector.

looking at this picture, it seems to me that these four thinner wires go to the 10 pin connector according to this layout, and I guess the thick one with constant power goes EP1 NOIR to BSI


I hope someone can confirm my assumptions to me because I would not like to do more harm than good

[GiveMeABreak]

8801 : trailer double relay
C200 : caravan socket connector
BSR1 : Trailer Fuse Box
8802 : trailer socket fuse-holder
PFPR : supply fuse holder if trailer fitted
BH12 : passenger compartment 12-fuse box /
BFDB : fuse box at the battery outlet
PSF1 : engine compartment fusebox panel

Wires
Looking at the diagram, the 10 Pin Black connector in your picture (BSR1 on the diagram) has the following Pin assignments (focus on the pin and wiring sleeve codes, not the colours)

Pin 4: Z14B : CAN+ supply
Pin 3: BH15: Supply from BH12 Passenger Compartment Fuse Box
Pin 6: 210 : brake lamps control
Pin 1: 9018 : body low speed CAN bus
Pin 2: 9017 : body high speed CAN bus

[danijelsuvajac]

this 8801 trailer double relay, is it a special unit or is in the same case with the BSR1?

[GiveMeABreak]

It may be part of the BSR but shown separately for the purposes of the wiring diagram.

[panoramix]

If someone want to create own wires, below draws how to connect sockets and plugs. Works for me, only not working disabling reversing sensors.