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Failed Xenon headlight

BMW forum 6 series car: E24, E63, E64, F12, F13

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Failed Xenon headlight

Postby Tony G6hbq » Sun, 09 Nov 2008 00:49:32 UTC

Sister has an E64 645Ci and the offside headlight has gone out.


Have looked for a fuse to no avail, nothing listed. :?
So off with the front wheels opened the access panel and headlight cover and swopped the starter and bulbs over and found no faults. :?
Dilema is Is there a hidden fuse or a relay to check ( put a multi meter across all the fuses in the glovebox and under the boot floor;all ok ) before having to remove the front bumper and subtitute the Xenon control unit(ballast) to eliminate this ! :cry:

Any one have any ideas?

Bumper off looks a big job :cry: and very fiddly
Thanks in advance.
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Postby m330d » Sun, 09 Nov 2008 00:53:32 UTC

If its not the bulb or igniter its likely to be the ballast.Thats the 3 main components of xenons.
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Postby Tony G6hbq » Sun, 09 Nov 2008 01:06:50 UTC

Correct ....checked two of them but before doing major bodywork to remove the bumper to get at the headlight to get access to the ballast I was looking for an obvious easy solution.
Seems strange that there is no listing for headlight dip or main beam fuses :?
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Postby m330d » Sun, 09 Nov 2008 14:05:02 UTC

There has to be a fuse somewhere but as one light is ok the fuse must be ok.You could check for 12v at the plug that goes into the ballast of car wiring loom.Do not go checking at the bulb as xenon voltage is very high.
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Postby minesavolvo » Sun, 09 Nov 2008 14:22:29 UTC

BMW WDS shows that lights get fed directly from "lights module" which has two 50A fuses F5 & F6 which should be in the glove box.

Igniter which you have already found is in or by the headlight assembly, ballast looks like it's built into the lights module
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Postby Tony G6hbq » Sun, 09 Nov 2008 16:03:56 UTC

Fuses 5 and 6 already checked and ok, :(
Ballast is located on bottom of light unit requiring bumper removal as previously stated.
As parts of the HID system run at 23.000v testing is a no no!
Subsitution is the only way to go but did not want to remove bumper and lights to swop over ballasts before every thing else as been explored.
On most cars the lights are sided right and left /high and low beam and fused separately. the fuse listing lists fuse 5.6.and 19 fort lights ,BUT there is no fuse at postion 19??? :? strange.
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Postby m330d » Sun, 09 Nov 2008 16:10:32 UTC

There will only be 12v going into the ballast though from the car loom ,just to check there is power there(eliminate fuse)
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Postby sanjx » Sun, 09 Nov 2008 16:10:46 UTC

the LKM elimiates the need for sererate circuitry and controls all the lights centrally hence single fused circuit i beleive :S
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Postby Tony G6hbq » Sun, 09 Nov 2008 16:14:14 UTC

m330d wrote:There will only be 12v going into the ballast though from the car loom ,just to check there is power there(eliminate fuse)


It's a bumper off job then :cry:

Ah well see what happens next week.
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