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Bulb failure message, bulb still lighting

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Old Aug 29th, 2019, 22:39   #1
B00TS
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Default Bulb failure message, bulb still lighting

Hello All,

I’ve just got a Bulb Failure - Dipped Beam message.

So far, so normal.

The odd thing is, the bulb is not blown. It lights when the ignition is on and then, about a second after starting the engine, goes out and the warning message appears.

I suspect the bulb filament has broken and re-welded itself as the light is slightly brighter than the good side.

Does anyone know whether the bulb failure circuit will fail a lamp for being over current, as well as under?

If so, I’ll just change the bulb but if not, I suppose I’m looking at replacing the failure detection circuit.

Many thanks in advance for any thoughts on this...

Boots.
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Old Aug 29th, 2019, 22:46   #2
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Swap the bulb out and test, that will give you your answer....
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Old Aug 29th, 2019, 22:50   #3
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Yeah, I will but it’s the nearside one and changing that one usually means a lot of swearing and a visit to A & E afterwards to repair my wrist!
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Last edited by B00TS; Aug 29th, 2019 at 22:53.
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Old Aug 29th, 2019, 23:14   #4
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The bulb failure warning is a current measurement. When the correct current is measured the warning goes out.
I’m guessing at a thermal issue, as the bulb heats up the earth is lost. Start with the bulb, but anywhere in series will get hot if the conductivity is wrong.
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Old Aug 29th, 2019, 23:24   #5
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No, it’s not a loss of continuity. The bulb stays on with constant brightness for as long as you like with the key at ignition only.

It only goes out after the engine is started and the ‘failure’ warning comes up.
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Old Aug 30th, 2019, 00:05   #6
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So the bulb goes out?
If the bulb lights then the bulb is good. If it goes out then it’s the feed to it if subsequently the bulb works again.
With the ignition on, the voltage is around 12.5V. With the engine running it’s around 14.8V. The difference might be enough to force a heat related failure?
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Old Aug 30th, 2019, 00:15   #7
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Hmm, maybe.

I will change the bulb tomorrow and see what happens.

Thanks for your input!
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Old Aug 30th, 2019, 13:59   #8
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Quote:
Originally Posted by B00TS View Post
Yeah, I will but it’s the nearside one and changing that one usually means a lot of swearing and a visit to A & E afterwards to repair my wrist!
Removing the air filter box makes it a lot easier to get at the N/S headlamp bulb.
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