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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 12-04-2012, 11:06 AM   #1
toolfan94
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Join Date: Feb 2011
Location: Eagle Pass,TX
Posts: 22
My Ride: 2005 M3 Vert. SMG
Random Electrical Problems

Hey guys,I currently have a 2005 M3 Vert SMG that I have been having strange electrical problems with.For example I cant put the top down, instrument cluster sometimes wont illuminate,whenever turn signal is engaged it wont illuminate on the dash,trunk button sometimes wont work,seat beat icon remains lit etc..All this is mainly from the inside, all lights from the outside illuminate properly and I don't have any problems starting the car or have had any driving issues. First thing I'm gonna check is my battery but its fairly new and have had it for a little over a year and cables seem to be very tight. The next thing is I can check are my fuses,any idea what could be causing the problem?
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Old 12-05-2012, 11:39 AM   #2
illestminimike
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It's the battery. If not the battery it's the alternator.
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Old 12-05-2012, 12:26 PM   #3
toolfan94
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My Ride: 2005 M3 Vert. SMG
Already checked the battery its still good, haven't checked the alternator but if my alternator would be going bad wouldn't I have trouble starting the car or wouldn't it drain the battery? I found similar forums closely related to my problem and I think there might be something wrong with my k-bus
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Old 12-05-2012, 05:15 PM   #4
illestminimike
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Is your battery light on? Does it ever come on?
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Old 12-05-2012, 05:59 PM   #5
toolfan94
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No battery light isn't on,nor has it turned on recently. Cluster light is off, seat belt light remains light as well as the smg box which indicates the gears.
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Old 12-05-2012, 06:05 PM   #6
Skchamaa11
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if your radio doesnt work that might be causing it i had a problem with my radio and the sunroof wouldnt open the right mirror wouldnt adjust and it wouldnt bring in cold or hot A/C
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Old 12-05-2012, 06:06 PM   #7
Skchamaa11
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just an idea from past experience.
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Old 12-05-2012, 06:06 PM   #8
Skchamaa11
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after i got a new radio everything started working again
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Old 12-05-2012, 10:23 PM   #9
toolfan94
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My Ride: 2005 M3 Vert. SMG
Radio is working fine, the factory ipod adapter that came with my car isn't working though. I also noticed that the convertible top button is blinking the one to close the top, but i cant operate those buttons either. Also my ac isn't throwing cold air I guess im gona have to take it to an automotive electrician so he can check the kbus wires
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Old 05-31-2013, 09:50 AM   #10
IMacDaddyI
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My Ride: 323 ci
Did you ever sort this out? Mine started doing something similar... Once in a while my Seatbelt lcon remains lit; turn signals wont click or come on on the dash although all lights are working fine outside; i also noticed my high beams wont turn on when this is happening.

The strangest thing is that all i have to do is turn the car ignition On and off ... And everything is back to normal. Its happened a few times but happening more frequently now.

Let me know how you resolved yours.
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Old 05-31-2013, 10:45 AM   #11
toolfan94
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Re: Random Electrical Problems

Car is working fine now, weird thing is it happened during winter time only and now that its summer everything works. I don't know if I had a loose cable or if temperature was triggering these problems

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Last edited by toolfan94; 05-31-2013 at 10:46 AM.
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Old 05-10-2014, 10:16 PM   #12
Jaypefelix
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I have these same issues right now what was the fix to yours.


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Old 05-12-2014, 08:32 PM   #13
Teslazerok
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Could be a K-Bus issue.
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Old 05-13-2014, 12:38 AM   #14
t3ddftw
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Try having a look here: http://www.bmwgm5.com/K-Bus_Troubleshooting.htm
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