C5 X7: What is this socket?

[dusk]

Hello. Which vehicle equipment does the white socket on the right belong to? It seems that electricity is received from the yellow cable on this socket in my vehicle. Could it be related to reverse gear light?

[cit-rotti]

Hello. Which vehicle equipment does the white socket on the right belong to? It seems that electricity is received from the yellow cable on this socket in my vehicle. Could it be related to reverse gear light?

This is a picture of the control unit "BSI" - there are many connectors and fuses. The marked plug is the main power supply for many operations.

An experienced electronics technician can only recognise details by looking at the associated circuit diagram.

This circuit diagram can only be called up via the specific chassis number (VIN) on the service hotline (subject to a charge).

The forum offers this service to donors.

Greetings Wolfgang

[PaulC5]

A complete guess, but it might be for the trailer wiring which would go to the boot area somewhere. This is only based on our 2007 C5 having a similar coloured wire which does this. You need to note the number code on the wires and if you can find where the wires appear elsewhere you could check the codes again to confirm it is the same wire. Otherwise you would need to look on a wiring diagram using the codes.

[GiveMeABreak]

No, it's the Main harness power supply Paul. I have rotated the diagram to more match up with the Op's photo:

The 2 pin white connector in the photo is (7) in the table (AP).
The Trailer connection CAN + Trailer unit (when fitted) is handled by (9) PK1

Reference	Connector	Number of channels	colour	Designation
2	EP	40	Black	Main harness electronics
3	EA	6	Black	Accessory electronics
4	PP	16	Green	Main harness power
5	PB	10	Black	Dashboard harness power
6	PB1	10	White	Dashboard harness power
7	AP	2	Grey	Main harness power supply
8	PH2	16	Grey	Power to the passenger compartment harness
9	PH1	16	Black	Passenger compartment harness power
10	EH2	40	Blue	Passenger compartment harness electronics
11	EH1	40	White	Passenger compartment harness electronics