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Ok, so I took the headlight out today and inspected it through the back caps for possible hints of why the LED rings wouldn't work. A quick test with a probe revealed that the headlight plug does indeed supply the current to the parking lights so it must be the headlight assembly that has failed to work. Obviously, there's so much stuff inside them it is not possible to have a thorough inspection on the guts without taking the whole headlight apart. Which I believe is only possible by heating around the plexi glass and cutting the glue used to bond it all together. So of course I didn't do that.
However, I was able to see a tiny white connector that sits on top of the bigger of the two LED rings (around 5-6 o'clock if you look from the back though one of the holes). The little connector had 5 smaller gauge wires coming out of it (all black). By visually tracing those black wires I was able to see that they turn into 5 heavier gauge wires, coloured black, blue, grey, red and brown. This also corresponded to the same colour coded wires that go into side indicator (a bunch of LED lights there too). So it appears that LED lights in those headlights all have the same 5 colours. Great.
The wires (now all colour coded) go into a control module which sits at the back of the headlight (there's also a couple of similar ones on the bottoms but they do not control the halo lights). I swapped out the modules with the working headlight and voila, the halos all worked fine again. The p/n for the module is 1 307 329 241. Land Rover sells them at £300 something +VAT but there's a few on eBay ranging from £25 to £85 both new and pre-owned. I've ordered one that was taken off a new headlight so will hopefully get it tomorrow.
Think I was lucky with this one. Could have been the whole headlight but it's only an hour or so messing with taking the lights off and £50 for the replacement ballast.
Happy motoring and I hope this helps someone with the same problem.
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1st May 2019 2:25pm
