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7 Series - E38 (1995 - 2001)

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  #1  
Old 05-17-2013, 11:12 AM
wildcat513 wildcat513 is offline
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Location: atlanta
 
Join Date: Mar 2011
Posts: 33
Mein Auto: 1998 740 IL
Rear Brake lights not working

I cant figure out why my rear brake lights are not working the one on the back windshield works but the other ones dont. Also the break light is lit up on my dash I thought I just needed new breaks but now I think it has to do with the break lights. Any suggestions???
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  #2  
Old 05-17-2013, 11:57 PM
ebida3's Avatar
ebida3 ebida3 is offline
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Location: High Point, NC
 
Join Date: May 2010
Posts: 555
Mein Auto: 2001 740iL
I would have said the brake light switch but I believe that the back windshield light is on the same circuit. And if that is the case it may be two burnt bulbs.
I know two bulbs going at the same time is way to coincidental but one may have blown first then you noticed the other at a later time.
You need a test light and see if you are getting any B+ ( juice) to the sockets. If no, you need to test the B+ going to the brake light switch. If you have B+ into the switch but not out than you have a bad switch, however if you do have B+ after the switch then you have...
1. Two bad bulbs
2. A bad common ground B-
3. A wiring issue at the B+ supply line to the B+ junction where the wire splits to go to both sockets.

From our friend Timm:
http://www.meeknet.co.uk/e38/E38_Brake_Light_System.pdf

Last edited by ebida3; 05-18-2013 at 12:05 AM.
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  #3  
Old 05-20-2013, 07:38 AM
wildcat513 wildcat513 is offline
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thanks i'll try that
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  #4  
Old 10-05-2014, 09:35 PM
Kevin Halbleib Kevin Halbleib is offline
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Location: Louisville
 
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Mein Auto: 740il
Same Problem

I have the same problem.

I am not sure what to check in regards to the terminology of the b+ and supply line. What is the supply line?
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