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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 10-04-2012, 11:58 AM
helpmyfive helpmyfive is offline
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Location: Ada Michigan
 
Join Date: Sep 2009
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Mein Auto: 528i
Light Control Module replaced but problem persists

SORRY to post a new thread, but I'm in a rush at work and DESPERATE for knowledge. Recently I replaced a transistor on the LCM to fix the headlight stuck on issue. It sort of worked. I bought 4 more transistors to fix the flickering problem but never got that far.

Lesson to other dummies out there: disconnect the battery before removing/installing the LCM!!!


I was reinstalling the LCM and bumped the heat sink on the bracket behind the glove box. SPARK!!! Now I have half the lights I used to. No fuses are blown, and it doesn't appear the bulbs are bad, but I have:

1 dim headlight on the driver side
1 bright headlight on the passenger side
1 blinker on the right rear ONLY
2 tail lights
0 driving lights

Dash indicates passenger and both rear bulbs out.

REPLACED the LCM with a salvage yard part (looked identical). No difference with the lights or dash at all.


What am I missing? Does the LCM need to be coded to work at all? I'm ok with an indicator that I tinkered with the electronics. Is there another fuse somewhere I'm missing? Is there a relay for the LCM? Nothing seems to be wrong, but I have lights out and a dash lit up.



I tried removing the battery cables and crossing for 15 mins. No difference.

I guess my question is: What tells the dash the light is out? Where is the power stopping and not getting to the bulb? The switch? The plugs? Anything?
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  #2  
Old 10-04-2012, 01:41 PM
acoste acoste is offline
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Mein Auto: 1998 528i; 2010 550i
LCM has 4 fuses (no relays): F112, F113 under the carpet on the passenger side, F16, F41 in the glove box. Maybe one of the big F11x fuses is out.
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  #3  
Old 10-04-2012, 03:52 PM
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champaign777 champaign777 is online now
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Posts: 2,046
Mein Auto: 2003 530 Sport Twins
had similar battery issue with GM module

Lesson to other dummies out there: disconnect the battery before removing/installing ANY BMW module


try this

disconnect battery
reconnect LCM module
clean errors in DIS/INPA and check LCM status

http://www.bimmerfest.com/forums/sho...416&highlight=
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Last edited by champaign777; 10-04-2012 at 03:56 PM.
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  #4  
Old 10-04-2012, 06:04 PM
helpmyfive helpmyfive is offline
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Acoste: YOU ROCK!!! I tested F111 and F112 and found F112 was dead. Made a makeshift fuseable link till tomorrow and we're good to go! THANK YOU THANK YOU!!!!!!!
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  #5  
Old 10-05-2012, 06:34 AM
helpmyfive helpmyfive is offline
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Mein Auto: 528i
Update: I should have my car taken away from me. I did something stupid. When I made a fuseable link to temporarily mend the problem I used too weak of a fuse and too small of gauge of wire.

Got in the car this morning and the fuse popped. NO problem, I'll just cross the wires since I know all the systems are fine. That way I can get to work and buy the proper fuse from NAPA.

Crossed the wires and they lit up like a light bulb. The car started smoking and I did all I could to pull the battery terminal. Meanwhile my 7 year old daughter is trying to show me her magnetic ducky. NOT NOW!

I got all the power off and waited a sec for the red hot wire to cool. I got the trim piece off and yanked the carpet up. The burned carpet. Then I removed the melted foam blocks a piece at a time. Underneath was a cloud of smoke and melted wires.


I removed all the schrapnel and got the car back to just "broken". I stopped by NAPA and got the correct fuse. Conclusion to this debacle later.
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  #6  
Old 10-05-2012, 06:54 AM
helpmyfive helpmyfive is offline
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Location: Ada Michigan
 
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Mein Auto: 528i
just an FYI. I did a little research. The fuse for the LCM is an 80amp, NOT a 50amp like the first one on the block. CHECK THE BMW PART NUMBER BEFORE YOU REPLACE ANY!

Back to the store for a replacement. Good thing I thought to check before I put it in and blew it.
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