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E34 (1989 - 1995)

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  #1  
Old 10-31-2012, 03:12 PM
pskbimmerfest pskbimmerfest is offline
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Mein Auto: 1991 525i
1991 525i Low beams intermitent

Most of the time after 5-10 minutes of headlight use the low beams die. Switching to high beams usually gets us to our destination. Sometimes wiggling the high/low switch on the steering column brings the low beams back, sometimes it kills high & low beams until more wiggling is done. Does anyone have useful suggestions of what to check? I have both analog and digital multimeters & good understanding of basic electricity. Thanks in advance to all with suggestions.
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  #2  
Old 10-31-2012, 04:01 PM
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BMWFatherFigure BMWFatherFigure is offline
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Mein Auto: E23;E30;E38;E32;E34 +
Either the hi/low switch or the relays are failing. Switch sounds more likely. Check for contact alignment and positive switch action.
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  #3  
Old 10-31-2012, 04:04 PM
robertobaggio20 robertobaggio20 is offline
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Light Kontrol module (LKM) ? Either that or you switch lever is faulty.

Please google and download the e34 bentley manual there might be useful tips there and its highly relevant to the diyer in general.
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  #4  
Old 10-31-2012, 05:03 PM
pskbimmerfest pskbimmerfest is offline
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Mein Auto: 1991 525i
BMWFF & Roberto,

Thank you for your suggestions. I am leaning more towards the LKM or relays as the low beams almost always work when headlights are first turned on. They usually work for 5-10 minutes before dying & having to use the high beams.
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  #5  
Old 10-31-2012, 07:11 PM
pskbimmerfest pskbimmerfest is offline
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Resoldered relay connections on main pcb of the LKM. Drove 15-20 minutes including a couple blocks of pot holes. All seems well. www.bmwe34.net had great step by step w/pix. 8-)
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  #6  
Old 10-31-2012, 07:21 PM
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BMR_LVR BMR_LVR is offline
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Mein Auto: 1992 525i
Quote:
Originally Posted by pskbimmerfest View Post
Resoldered relay connections on main pcb of the LKM. Drove 15-20 minutes including a couple blocks of pot holes. All seems well. www.bmwe34.net had great step by step w/pix. 8-)
Thanks for posting your solution and the link!
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It's Deja Poo - as in, I've heard this **** before.
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Calypso Red 1992 525i with 200K miles

1991 735i - Sold
1992 525i - Sold
1995 325is - Sold
2000 528i - Sold

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  #7  
Old 10-31-2012, 09:06 PM
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BMWFatherFigure BMWFatherFigure is offline
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I love a story with a happy ending.
__________________
Good - Fast - Cheap: Pick any two.
Current:
E23 735i; E32 735iL (X 2 - 1 Alpine White and 1 Glacier Blue); E34 535i; E38 735iL; R50 Cooper; R55 Cooper Clubman.
Previous:
E21 318i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i
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  #8  
Old 10-31-2012, 09:54 PM
robertobaggio20 robertobaggio20 is offline
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We should create a sticky thread with obscure problems and naturally obscure solutions listed, detailed, or at least referred to via an additional link. Over time, this would become the master thread that people would screen for problems first. Or perhaps it can be stashed into the maintenance thread.
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