macc man
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| posted on 24/3/12 at 05:58 PM |
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Rear high level led light fault.
I have spent several hours trying to identify a fault on my BMW compact. It failed the MOT on an LED brake light not working. Tested for 12v at the
light and neither voltage or earth present. Led works if you apply a voltage to it. So I spent an age running a fresh feed from the brake light
cluster. Only problem is when I connect the other brake light into circuit the LED goes out. It seems to need more current than the circuit will
supply with both bulbs and led connected. Only solution without dismantling the car to find the fault would be to put a relay in the circuit. Any help
would be appreciated.
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rusty nuts
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| posted on 24/3/12 at 06:04 PM |
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IIRC a high level stop light not working isn't a failure even if fitted as standard the tester has to assume that it isn't wired up . It
used to be at one time if it wasn't visible then it wasn't tested , if it was and didn't work then it was a failure.
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theconrodkid
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| posted on 24/3/12 at 06:37 PM |
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sounds like a dodgy earth,chec for grot/rust etc around earth terminals
who cares who wins
pass the pork pies
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jacko
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| posted on 24/3/12 at 07:30 PM |
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quote:
Originally posted by rusty nuts
IIRC a high level stop light not working isn't a failure even if fitted as standard the tester has to assume that it isn't wired up . It
used to be at one time if it wasn't visible then it wasn't tested , if it was and didn't work then it was a failure.
Is this right ? i thought if it was fitted it has to work . I am probably wrong so excuse my ignorance
Jacko
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britishtrident
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| posted on 24/3/12 at 08:32 PM |
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Bulb failure warning via CAN bus throws a hissy if the resistance of the bulbs is wrong.
You need to track down where the break in the wiring is.
[Edited on 24/3/12 by britishtrident]
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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macc man
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| posted on 24/3/12 at 10:21 PM |
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Thanks for the replies, I will have another look at it in the morning. Thanks Henry.
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loggyboy
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| posted on 24/3/12 at 11:56 PM |
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Tell them you disconnected it. The wording in the manual states:
Additional stop lamps fitted and connected must be tested. Where extra lamps are fitted and there is doubt as to whether they are connected, the
benefit of this doubt should be given to the presenter.
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