Looking for the cause of my LED sidelights not working.

I really dont know where to start. But I have removed the glove box to look for the CJB and to look for loose connections or damaged wires etc.

I'm not taking the CJB out as Im not even sure if its at fault. And I couldnt diagnose it anyway.

But this looks nothing like the CJB in the workshop manual or that previously dsecribed here
https://www.freel2.com/forum/post447906.html

Click image to enlarge

Click image to enlarge

Yes it is, mine's like that. Not sure when they changed it maybe the 2012 facelift?
Both types are described in this video. Headlamps / DRL do not seem to be on the list however so not sure where they are?

Useful video.

I think most of the exterior lights are protected by FETs on the CJB circuit and therefore dont have a fuse.


There are plenty of the 2nd hand CJBs on Ebay inc our later versions - AH22-14F041-BG - most from Disco Sports - Im guessing that they would need to be programmed for a FL2 Jules

While I was looking for the details of the fuses I found a service on Ebay that will reprogram the module's configuration to match the car. £100 though!!!

https://www.ebay.co.uk/itm/285433473339

jules wrote:

Useful video.

I think most of the exterior lights are protected by FETs on the CJB circuit and therefore dont have a fuse.


There are plenty of the 2nd hand CJBs on Ebay inc our later versions - AH22-14F041-BG - most from Disco Sports - Im guessing that they would need to be programmed for a FL2

Thanks Ian

I Have tried hard reset twice - removing POS & Neg leads and connecting together for 10 mins.

All other lights are working fine. inc headlights and indicators - switching on and off as normal.


"therefore I would by looking at the controlling switch..." Do you mean the column stalk ?

"... or logic for sidelights." What would that be ? Jules

Have you tried unplugging one of the headlight units to see if that affects the other one?

I have seen some strange symptoms reported on here where a fault on one side DRL causes the other side to go out or neither will light.

Had both lights out - but not tried running one with the other disconnected - something to do tomorrow. Jules

Sorry Jules but I have looked at the HID wiring diagram in the Repair Manual and cannot see an obvious cause.
Am I right in thinking that the missing lights are the front DLRs, if so, I think that they are triggered by the ignition power (signal?).

If all other lights are working I think you can rule out any switch gear being faulty. FL2 XS SD4 Auto 2010 2012-2017 (21k - 91k miles) (MY2011)
FL2 Metropolis SD4 Auto 2014 2017- (16k - 84k+ miles) (MY2015)
Metro in its 11th Year of (Extended) LR Warranty / Full LR Service History
(Expensive, but Trouble/Worry free - hopefully?)

No, missing lights are the front sidelights (round, 7 LEDs) and sometimes the DRL strip.
Rear lights, stop lights (inc tailgate), reversing lights, front and rear fog, and all indicators are all working normally. Just front sidelights and DRLs affected.


Perhaps problem best explained thus :


Stalk position - LIGHTS

OFF - nothing ON (as expected)

Sidelight - only DRL strip ON (no sidelight ON)

Headlight - DRL ON and headlight ON (dipped and main - its a shutter), no sidelight (not even dimmed)

AUTO - nothing ON (DRL and sidelight should be ON, IIRC) Jules

have you tried using a multimeter and checking for voltages at the connector on the back of the headlight these can sometimes corrode and need a clean up

jules wrote:

OFF - nothing ON (as expected)

Sidelight - only DRL strip ON (no sidelight ON)

Headlight - DRL ON and headlight ON (dipped and main - its a shutter), no sidelight (not even dimmed)

AUTO - nothing ON (DRL and sidelight should be ON, IIRC)

It is worth noting that DRL do not come on when vehicle is not in gear. FL2 SD4 XS 2013 Orkney Grey

Thanks Lakelander.

I'm rather emabrassed to say I dont think there is anything wrong with the lights after all.

We've had this car over 10 years and had never noticed that fact that the lights don't work as I expected until its been in gear- never noticed what the lights were doing whilst one of us starts it up.

In preparation for the MOT I had to replace the bulb in the high level tailgate stop lamp.
I then simply turned the engine ON and expected all the lights to behave properly - as they have in every other car that Ive owned.
It never occurred to me that the car needs to be actually in gear - as it would make testing a bit awkward for a single DIYer. Jules

Last edited by jules on 20th Aug 2025 12:05 pm. Edited 1 time in total

congoblue wrote:

Just to be clear this is not how the car normally works. The round 7-LED lights are normally called "DRL" and the LED strip pattern is normally called "signature strip"

My old BMW had "halo" LED DRLs (which were lit permanaently) and proper bulbs for sidelight and headlights.

But from what you are saying the round 7 LED light that I took to be a sidelight because it looks like a sidelight is actually the DRL and the siganture strip is actually the sidelight and not a DRL.

This is obviously a source of some of my confusion and not helped by the column stalk showing a light symbol for sidelight rather than something resembling the signature strip.

I must bve getting old.  Jules