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E12, E28, E34, E39, E60 General discussion and technical help for all year 5 series cars.

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Old 10-10-2009, 10:14 PM   #1
ptunedms

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Exclamation E39 Lights Flicker when at idle or when braking

I have a 2000 E39 and when I step on the brakes the lights flicker for a quick sec then normal. When this is happening I notice that all my lights have a very slight constant flicker. This doesn't happen all the time. It's very random, and sometimes I can turn the car off and restart, and it's fine. Any body with similar issues or have any idea how to fix this? Alternator, LCM, GM...?

Thanks in advance for the help :-)
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Old 10-11-2009, 12:56 PM   #2
Big Evil
 
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Loose connector, weakening alternator/battery is also possible. Check your battery connections, clean and tighten if necessary. Have the batt and charging system tested. Next steps can get expensive and complicated.
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Old 10-11-2009, 01:04 PM   #3
ptunedms

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Battery... check!

I have checked all connections to and from battery and grounds. My next step is to have the alternator cleaned and/or replaced. I have to go in for a intake gasket replacement, so I'll have them do it then. Just a very annoying problem, and sometimes, it's bad enough to look like I'm flashing my lights at people.
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Old 10-12-2009, 04:02 PM   #4
Big Evil
 
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Have them run a short test on the cars networked modules also, make sure its not one of those.
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