C5 X7 Tourer rear permanent 12v power socket

[Paul-R]

This was working when we went down to France a month ago but when we came back last week it wasn't. Abit of a pain as I run the cooler box off it.

Anyway, today I finally got round to giving it a good looking at. The handbook says that fuse F6 at 25A is the one in line and once I had found out which F6 it was (the small box with a red cover in the engine bay) I found that it was intact. I pulled it out and tested it with a multimeter just to be sure.

So, what could it be? I think I'm going to need the wiring diagram and, probably, loom layout diagram to get to the bottom of this. Or should I just say effit and put a new wire in straight away?

I suppose I should at least make an effort to trace it through. VF7**************[VIN obfuscated, can be read by forum staff]

[GiveMeABreak]

It's not that fuse from what I can see - it should be Fuse F9 in the BSI (30A), unless the diagrams are wrong again....

According to this both front (8100) and rear (CP00) 12V Accessory sockets share the same 30A supply:

[Paul-R]

Pretty sure those two are the ignition controlled cigar lighter sockets in the front and between the backs of the front seats for the rear seat occupants.

However, the drawing does show what I want which is CP05 and confirms that the fuse is F6. Unfortunately it confirms that the circuitry is extremely simple and it doesn't indicate any particular point at which it might fail.

I'll print both images out and study them at leisure,

[GiveMeABreak]

Of course with your estate you have the boot socket too, so yes, CP05 and the fuse is as you say.

[MattBLancs]

Sort of related question / confused:

That diagram shows both passenger compartment sockets as being fed by different cables, but from a common linked feed from fuse F9 within the BSI1 - reason for my confusion is on my X7, socket ahead of the gearstick is on / off with ignition, but the one in front of the rear seats = permanently fed.

Interesting also that they are in a 30 Amp fuse, that's a good chunk of current capacity! Would expect more like 10 amps (for a single socket admittedly)

[Paul-R]

Is this a Sedan (Saloon) or Tourer (Estate) Matt?

[MattBLancs]

Is this a Sedan (Saloon) or Tourer (Estate) Matt?

Sorry, a Tourer same as the OP.

(I've not used my boot mounted socket as yet so not sure on the operation of it! )

[Paul-R]

Assuming you have the same wiring harness as mine then it can't happen. So, two possibles. You don't have the same harness, your VIN would confirm or not whether that's the case. Or someone has been in before you and wired it up directly.

It would be instructive to know what the rear socket does.

[GiveMeABreak]

Sort of related question / confused:

That diagram shows both passenger compartment sockets as being fed by different cables, but from a common linked feed from fuse F9 within the BSI1 - reason for my confusion is on my X7, socket ahead of the gearstick is on / off with ignition, but the one in front of the rear seats = permanently fed.

Interesting also that they are in a 30 Amp fuse, that's a good chunk of current capacity! Would expect more like 10 amps (for a single socket admittedly)

It's because the BSI is controlling the front (Cigar Lighter) socket, and the 2 rear sockets are not (just BSI timed IIRC). It's the way it was designed, so I doubt anyone has done anything to it.

[Paul-R]

I have to disagree Marc. The schematic clearly shows both sockets fed from the same fuse, F9. Unless the schematic is wrong. Not impossible of course.

[Paul-R]

And the very rearmost socket isn't under the control of the BSI at all. It stays live all the time (when it's working!) and doesn't time out at all.

[GiveMeABreak]

Yes I know that Paul - but I'm talking about the forward socket pin 1 which goes to pin 11 and into an ECU in the BSI - which may control the circuit - and the other 2 rear ones are relay controlled which means they'll just stay live until the BSI shuts everything off.

[Paul-R]

That's the lamp surely?

[GiveMeABreak]

Yes that 'nuclear' symbol is for the lamp, but there's another symbol next to it, that I'm trying to find a description for...

[Paul-R]

If you mean the thing that looks like a bell push in profile with a resistor inside, that's surely the cigar lighter element.