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E34 (1989 - 1995)

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  #1  
Old 09-22-2012, 07:07 PM
tscott1 tscott1 is offline
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Location: illinois
 
Join Date: Sep 2012
Posts: 3
Mein Auto: 1995 540i
Brake light/Park light problems

Hi,
Iam a new member to the forum and I am lookimg forward to learning about my 1995 BMW 540i. I am having consistent fuse issues #5 &6 affecting a park light, brake light and instrument panel. When I replace the fuses they last 2-3 hours to maybe a few days and then they burn out again. Sometimes the problem happens when I turn on the headlights or step on the brake peddle. All of the fuses under back seat have been checked and they are all good. I could use your help to troubeshoot this issue. Thanks much.
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  #2  
Old 09-22-2012, 09:49 PM
My525iT My525iT is offline
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Location: Florida
 
Join Date: Aug 2011
Posts: 127
Mein Auto: 92 525iT Wagon M50
Shooting from the hip as electricity is funny.
1. Also, check all of the fuses in the underhood junction box. Check all for the correct amperage per the chart on the covers.
2. Check all bulbs for proper specified bulbs.
3. Check for a short. Are the bulb connections corroded or touching an inadvertent wire or the body of the car.
4. Does the 540 have a brake light switch? Check Bentley.
5. All of that fails - you can take your electric diagrams, multi-meter and a highlighter and start testing.
6. Might be a short in the LKM (Light Control Module). On my E34 it does control all lights, not just the headlights. It is in the Underhood junction box. It may also be loose.
7. Could be the wire connection to the fuse box.

As I said electricity is funny. Hopefully this is a common issue that a 540 owner will respond.
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  #3  
Old 09-23-2012, 10:34 AM
paperplane94 paperplane94 is offline
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Location: Los Angeles, CA
 
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Mein Auto: 1989 525i M20B25
Definitely check the wiring on your trunk hinge arm. It will often short to ground there and blow fuses.
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  #4  
Old 09-23-2012, 10:51 AM
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BMWFatherFigure BMWFatherFigure is offline
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Location: Perth, Western Australia
 
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Posts: 2,625
Mein Auto: E23;E30;E38;E32;E34 +
Presuming all the checks from my 525iT check out OK it sounds like a short to earth. I'd start by checking looms in the boot (trunk).
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  #5  
Old 09-23-2012, 11:08 AM
paperplane94 paperplane94 is offline
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Mein Auto: 1989 525i M20B25
Quote:
Originally Posted by BMWFatherFigure View Post
Presuming all the checks from my 525iT check out OK it sounds like a short to earth. I'd start by checking looms in the boot (trunk).
copycat...






I'm just messin with ya.....
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  #6  
Old 09-23-2012, 12:39 PM
tscott1 tscott1 is offline
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Location: illinois
 
Join Date: Sep 2012
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Mein Auto: 1995 540i
Thanks much. I will follow your suggestions and post the out come.
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