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Thread: Drivers Side Headlight out - D4

  1. 23rd May 2017, 10:23 AM #1
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    Drivers Side Headlight out - D4

    Hi all,

    Drivers side headlight is out - normal beam not hi-beam.

    Thought it must be the bulb, changed and tested bulb no problem there.

    Spent a good time hunting for a fuse - no obvious headlight fuses!?

    Slight heat damage to the plug that connects to the rear of the bulb.

    Can anyone point me toward a resolution? a fuse, a relay, a...?

    Thanks

    John
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  2. 23rd May 2017, 10:44 AM #2
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    Do you have Halogen or Xenon headlights?
    2010 TDV6 3.0L Discovery 4 SE remapped to RRS output, Alaska White, GME XRS-330c, IIDTool BT, Dual Battery, Apple CarPlay, OEM Retrofitted: Cornering lights, Door card lights, Power + Heated Seats, Logic 7 audio
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  3. 23rd May 2017, 12:00 PM #3
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    Halogen headlights - H7 bulbs
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  4. 23rd May 2017, 12:21 PM #4
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    To be clear up front, i'm no expert, however there is I think a headlamp fuse located in the fuse panel behind the lower glovebox.
    Open the glovebox normally, then push the side 'stoppers' in a little to allow it to swing all the way down/open. You should then see a bunch of fuses in there.

    Don't close the car door with the glovebox all the way open - it will hit, and break it.
    2010 TDV6 3.0L Discovery 4 SE remapped to RRS output, Alaska White, GME XRS-330c, IIDTool BT, Dual Battery, Apple CarPlay, OEM Retrofitted: Cornering lights, Door card lights, Power + Heated Seats, Logic 7 audio
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  5. 23rd May 2017, 04:51 PM #5
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    Quote Originally Posted by veebs View Post
    Open the glovebox normally, then push the side 'stoppers' in a little to allow it to swing all the way down/open. You should then see a bunch of fuses in there.
    Been there, done that. No headlight fuse there.
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  6. 23rd May 2017, 05:03 PM #6
    plusnq
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    Quote Originally Posted by Leyland1980 View Post
    Been there, done that. No headlight fuse there.
    this might help.
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  7. 23rd May 2017, 05:11 PM #7
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    Okidoki - looks like they may be protected by MOSFETs (Metal Oxide Semiconductor Field Effect Transistors) located on that fuse panel. These sound like automatic circuit breakers, for want of a better term, which react to the heat increase following increased current flow caused by a short circuit. Nothing that needs intervention.

    You mentioned heat damage on the bulb - are you certain there isn't a short in the plug?
    2010 TDV6 3.0L Discovery 4 SE remapped to RRS output, Alaska White, GME XRS-330c, IIDTool BT, Dual Battery, Apple CarPlay, OEM Retrofitted: Cornering lights, Door card lights, Power + Heated Seats, Logic 7 audio
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  8. 30th May 2017, 07:37 AM #8
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    Quote Originally Posted by veebs View Post
    Okidoki - looks like they may be protected by MOSFETs (Metal Oxide Semiconductor Field Effect Transistors) located on that fuse panel. These sound like automatic circuit breakers, for want of a better term, which react to the heat increase following increased current flow caused by a short circuit. Nothing that needs intervention.

    You mentioned heat damage on the bulb - are you certain there isn't a short in the plug?

    Still battling with this one.

    There definitely appears to be some heat damage to the plug on the back of the bulb but doesn't appear shorted/shorting. Interestingly there is voltage at the plug even when the igniotion and switch are off? is it an earth switching switch on the headlight?

    Cheers

    John
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  9. 30th May 2017, 05:58 PM #9
    crawal
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    Angry

    trace back along the wiring bloody mouse sampled the wiring on my Disco , what a pain to pull out the light with the ARB bar , only to find a nibble on the wire .
    not happy
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