Hi, I've just picked up a 2008 XKR. 6 days of ownership! The car has no power to the cigar lighter and no power to the glove box accessory power outlet.
After searching the forums, this seems to be a common problem but no one has posted a solution. We've all checked the obvious fuses and that's not where the problem lies.
Fuse F9 in the engine box is good. The cigar lighter relay is also good. But the relay NEVER gets activated. If I bypass it, I get power to the cigar lighter.
The relay is activated by a connection from the LH footwell fusebox (Central fuse box).
This central fuse box has an ignition relay R2 which also checked out to be working. However, all the connections from this LH footwell fusebox t(o rear accessory, glove box accessory and cigar relay etc) ALL terminate in a dotted rectangle box in the wiring diagram. (See green box in picture.)
This seems to be where the problem is, but I have no idea what this dotted rectangle is. Can anyone shed any light?
​​​​​​​Mark

 

This is what the key to the electrical guide shows. Presumably it is the internal logic for the termination and distribution of signals between buses.

 

gbmarc, I am almost as good at reading the Electrical Guide as I am reading the Dead Sea Scrolls. However, the mystery rectangle appear to be part of the medium speed CAN BUS system. Unfortunately, I can't find a diagram that identifies which physical box that component might be in the central junction box.

Have you located the relevant connectors FL081 and and FL042?

 

 

The relay is only there to ensure the lighter operates when the car is in acc or running mode. Consider running the lighter off of another ACC terminal?

If you pull the fuse and connect an ohm meter between to two contact points in the fuse holder, turn on the acc, there is continuity?

 

Thanks Sean. Those connector pics are really helpful. I hadn't identified the FL081/2 and FLO42/8 connectors yet. Within the engine fuse box if I activate the Cigar lighter relay manually, then everything works. The issue is that it never receives activation power. I will now check if FLO42/8 goes live with the ignition on and if not, then go back to FL081/2 in the LH footwell fuse box to see if that is 12v+ve. If all that fails then the "Electronic component" /dotted rectangle will be at fault.
For now, to get the lighter power on, I have just jumped the circuit that the relay would normally connect in the engine fuse box. So it's live all the time.

 

Within the engine fuse box if I activate the Cigar lighter relay manually, then everything works. The issue is that it never receives activation power. [/QUOTE]
Thank u102768 for the pics. I got it from him and he pulls them via his Topix subscription which is really great of him.

It's also here posted by Graham at the top of our X150 Forum page:
https://www.jaguarforums.com/forum/x...guides-215509/

The "electronic component" is in part a Medium Speed CanBus connector which are actually CA016 (twisted wires) and if it were at fault, your car wouldn't be running. I think the diagram is deceiving or confusing here, at least to me. I see no relation to the CanBus and a lighter and I'm sure you don't either yet the diagram reads that way at first blush.

If it's me, I'm not messing with the box. If memory serves, one of the CCF files is stored in the CJB. It's more likely a broken wire and I'd lean toward inbound to the box @ the engine bay. On the bright side, you know all that connectors from the Bay are working!

I know you want it done right, but for my money, splice into the accessory port behind the glove box. That would be connector IP009. It will accomplish the same objective and you won't need to mess with the CJB.

 

t
hi Mark

this maybe a a very basic question but my understanding is that some models of XK and I think earlier models is that the cigar lighter and glovebox sockets are not live when ignition is off. Have you tried when ignition is ON.
There have been threads when guys have tried plugging in devices etc .

 

It's a good question Woo5ie. I did check wiring diagrams that I have (07-09, 2010 - 11, 2012 onward) and while the newer models are wired a little bit different, all of the diagrams show the cigar lighter runs on B+ or battery positive voltage which means they're live with the ignition off. The Glovebox socket is wired to be live only when the ignition is on.

 

The cigar lighter on my old '07 XKR and current '10 XKR both lose power as soon as the car was locked but had power in convenience mode.

 

perhaps the logic in the mystery box? There's nothing in the diagram that would indicate it, but I certainly believe you

 

I only know because when I was having issues with the battery on my '07 I ran around for a month or so with one of those cigar socket devices that shows the voltage so that I could keep an eye on it and noticed that it came on when I unlocked the car and went off again when I locked it.

I have done the same with my '10 out of curiosity to see how much the voltage fluctuates with the BMS and that turned off when I locked the car too.

 

There's no power to the cigar lighter OR the glove box with the ignition on or with the engine running. (Well, there is now because I've jumped the relay!

 

Well now I'm really confused. The accessory socket is an entirely different circuit and is fused in the CJB - fuse#19 - 15A mini.

 

I believe the glovebox accessory power socket is energized through the ignition relay, which is of course separate from the cigar lighter relay.

 

OK, Problem solved.
I had to replace my LH upper control arm and to get to the nut you have to lift up the engine fuse box.
When I lifted it up, there staring me in the face was a broken yellow and blue wire going to the cigarette lighter relay.
This wire comes from the footwell fuse box and you can see it broken off just half an inch from where it goes into the back of the relay connector. But the worrying question is - Why was the wire broken? Does this mean that other wires will randomly break? It's not like there is a bunch of movement there ,underneath the fuse box. But from searching other posts I see that I'm not the only one with this condition.



Accessory relay yellow/blue wire break underneath engine fuse box

 

Clean break, or possibly rodent chewed?

 

My intake resonators were chewed up when I first bought the car. I would put my money on hungry critters.

 

Graham, would you mind adding SOLVED to this thread?

 

Removed.