sceh
Member Since: 14 Sep 2011
Location: annecy
Posts: 233
  
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| LR4 headlights don't work |
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2011 LR4. The headlights have suddenly stopped working?. Fog lights at the front too. Main beam OK.
There is no fuse for these but there is a relay I guess. The workshop manual is pretty esoteric and of little help.
All the other lights work as per usual.
Which relay controls all this and/or which main fuse if there is one?
Thanks for any pointers
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 7th Aug 2021 12:49 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10360
  
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very odd.
THe D3 has 2 large J type fuses under the bonnet. With a bulb symbol.
These do exterior lights side/dip/main
No relays
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| 7th Aug 2021 2:11 pm |
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Hardware
Member Since: 28 Jun 2016
Location: Hiding under the M60
Posts: 12697
 
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they use a MOSFET transistor IIRC so that they can allow the surge start-up current without blowing - cars with Xenons don't have different wiring and they can take a hefty initial current.
it will shutdown supply if large current persists for too long. so if you have a short, it will shut down the supply.
Didn't think fogs were on same circuit ? someone brighter may correct me.
Main beams are halogens so don't need the fancy circuitry. .
Dean
====================================
2011 D4 XS - OBD port protection, RLD spare wheel protector, All LED interiors lights, Timed Climate enabled, iiD tool paired.
2011 D4 Landmark - Stolen from same dealer before I paid for it
2011 D4 GS - Stolen whilst at dealer  ... All LED interiors lights, DRLs, Spare Wheel protector.
1996 300Tdi - Eaten by tin worms
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| 7th Aug 2021 4:11 pm |
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sceh
Member Since: 14 Sep 2011
Location: annecy
Posts: 233
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So if the main beams are on another circuit, where is their fuse?
I can hear something click in the passenger side fuse box but can't locate it and it is far from clear on their circuit diagrams
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| 7th Aug 2021 4:44 pm |
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sceh
Member Since: 14 Sep 2011
Location: annecy
Posts: 233
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and the odd thing is that the headlights on high beam work but the fogs and the ordinary headlights don't. I would have though it improbable that foru bulbs blow at once so where can the fault be?
I have the IID tool but my car does not have the headlight ECU..
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| 7th Aug 2021 4:48 pm |
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Hardware
Member Since: 28 Jun 2016
Location: Hiding under the M60
Posts: 12697
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Fogs are on Fuse 3 in the glovebox fuse box.
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| 7th Aug 2021 5:23 pm |
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sceh
Member Since: 14 Sep 2011
Location: annecy
Posts: 233
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Thanks! I'll check but it comes to mind that since the rear fog light works then perhaps the issue is bulbs at the front? I will also check that after checking fuse 3
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| 7th Aug 2021 5:45 pm |
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Hardware
Member Since: 28 Jun 2016
Location: Hiding under the M60
Posts: 12697
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Handbook says Fuse3/15A/Blue/Front Fog Lights.
can't see rears listed.
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| 7th Aug 2021 5:52 pm |
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sceh
Member Since: 14 Sep 2011
Location: annecy
Posts: 233
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Fuse 3 is OK.
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| 7th Aug 2021 6:59 pm |
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DG
Site Moderator
Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50934
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Hardware wrote:if we answer in the "twin" thread, it will be easier for DG to merge the threads.
https://disco4.com/forum/lr4-headlights-dont-work-196566.html
 21 year LR veteran > D2 GS 2003 > D3 S 2006 > D3 HSE 2009 > D4 HSE 2013 > D4 HSE 2015 > D5 HSE 2018 > DS HSE R-Dynamic P300e 2021
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| 7th Aug 2021 8:22 pm |
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sceh
Member Since: 14 Sep 2011
Location: annecy
Posts: 233
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Right. Fixed.
I had a random DTC code:
B1D01-15 Right Low Beam -
Circuit short to battery
or open
Right low beam circuit
short circuit to power or
open circuit
Refer to the electrical circuit diagrams and check
right low beam circuit for short circuit to power or
open circuit
This basically means the bulbs were blown - both of them.
I learned a couple of things though.
Getting the grill off so you can remove the headlights is done by unclipping the top four clips and pulling the grille OUTWARDS at the bottom (each side). Not UPWARDS as all the manuals say.
Accessing the fusebox on the passenger side is not done by pressing the sides of the box inwards but by pushing the left hand clip downwards..
Still, all's weel taht ends well but I wonder what made both bulbs go at once
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| 8th Aug 2021 10:22 am |
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Landylad
Member Since: 23 Dec 2008
Location: Aberdeenshire
Posts: 366
 
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Other than blown bulbs, what is likely to cause this fault? Does the 50a relay influence the FET system?
Both my main dipped headlights went awol tonight... had to drive home on sidelights in the dark. High beam working ok. Checked a bulb - looked fine but changed it for a spare and still not working. If in doot, flat oot!!
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| 1st Mar 2024 9:18 pm |
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itsaguything
Member Since: 20 Dec 2023
Location: Manotick, On
Posts: 140
  
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All kinds of things… ballasts, grounds, fuses, relays…. and deteriorated wiring insulation from the high temperatures and age involved. 2015 LR4 HSE Lux Aintree Green
2013 LR2 HSE Radiance Red
2007 XKR Jaguar Racing Green
2005 XJR Jaguar Racing Green
2002 S-Type R British Racing Green
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| 2nd Mar 2024 1:24 pm |
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Landylad
Member Since: 23 Dec 2008
Location: Aberdeenshire
Posts: 366
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These are just Haolgen though - not really producing heat of that magnitude. And why would both stop working all of a sudden? Sounds a bit odd. That said, it is a Landrover!! If in doot, flat oot!!
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| 2nd Mar 2024 1:45 pm |
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