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E46 Convertible
The E46 vert forum. Talk about dropping your E46 top here.

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Old 02-06-2013, 09:52 PM   #1
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Join Date: Sep 2011
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E46 Convertable: Seatbelt/Cruise/Radio/Brakelamp Issue

2004 330ci Vert with about 80k miles on it.

Go to start the car and the cruise control light will be on, and no matter if you turn it off or not, it won't matter it won't go away.

The top has become very finicky sometimes will go down sometimes it won't.

Passenger seatbelt light is flashing even if no one is in the seat

Now all of this doesn't always happen, its random, just a lot more consistent these days.

Ok 46 guru tell me whats going on?

1) Radio will work whenever it pleases, when it is not working its almost like it thinks the car is off, you hit the power button and nothing happens, yet the red security light is flashing like the car is parked and locked.

2) Brake lights are on at all times, no matter if the headlights are on or off, or if the brakes are being administered or not.

3) None of the steering wheel controls are working, no lights on the steering wheel. Flashers and wipers are working.

4) None of the buttons above ash tray are working, but they do light up.

5) The cruise control light on the cluster is on, when you turn the car on, but you can't set cruise or turn it off.

I know it is a lot to read however I feel like this is an issue that is going around with no answered solution. Searched to no avail.

Please PM me, or email me.

Any input is appreciated.

Pulled these two CEL codes:

P2806 Circuit Failure Data Exchange Timeout
P27A4 EWS 3.3 Interference DME EWS

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Old 02-09-2013, 12:03 AM   #2
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I am working this same problem on my friends 2003 330Ci Vert. We ended up finding a short on the bus that powers fuses 1-15. Eventually we pulled fuses 11 & 13 (Roll Over System & Air Bags) and were able to get almost everything back on. Now our symptoms are the Air Bag and Roll Over system lights flicker on the instrument cluster. We also noticed that when the horn is activated it sometimes works... but more interesting is that the flickering Roll Over & Air Bag turn on all the way when the horn is pressed. So I'm thinking that we may have a short in the steering wheel or column. Either a bad clock spring or short wire of some sort. Hopefully we solve this issue cause it seems to be happening more often to other people.

Also make to check Fuse #10 as your symptoms can be caused by a shorted #10 fuse. Keep us posted!


It ended up being the ignition switch! I swapped out the one I had in my '04 330Ci and put it in her '03 and everything started working properly. We did have to reset the convertible top function but all the other functions & features are working properly. I took apart the faulty ignition switch and took continuity measurements that I will compare against the new ignition switch that I have ordered.

I hope this information helps someone else out. If you are having these similar symptoms please see if pulling fuses 11 & 13 causes these results for you. If so then look toward replacing your ignition switch to solve your problems. Good luck everyone!
2004 BMW 330Ci Convertible

Last edited by Nickvjr; 02-24-2013 at 01:41 AM.
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Old 04-25-2014, 01:51 PM   #3
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I know this is an old thread, but I thought I'd post my solution in case it can help someone else with the same problem.

I had the same exact symptoms on my 2004 330Ci -- airbag light on, cruise control light on, convertible top light on, convertible top not working, etc. I simply disconnected the negative cable from my battery for 5-10 mins. When I re-connected the battery cable, everything reset and all was fine again.

I am unsure what the cause was. I drove my car to the local auto parts store to get the battery checked, and it checked out okay.

I vacuumed out my car the night before and may have bumped into some of the wiring under my car seat which may have caused a temporary short. But, I don't know for sure.
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Old 05-12-2016, 09:34 AM   #4
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Hi everybody. I know this is an old thread, but I had almost exactly the same symptoms as TheGoodGuy, but instead of replacing the Ignition Switch, I removed it and gave it a good spraying with WD40, refitted it and now everything works again. Thanks Nickjvr for leading me to this solution. Keep up the sterling work!
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Old 10-12-2016, 08:14 PM   #5
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Location: Long beach
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Originally Posted by Grockle View Post
Hi everybody. I know this is an old thread, but I had almost exactly the same symptoms as TheGoodGuy, but instead of replacing the Ignition Switch, I removed it and gave it a good spraying with WD40, refitted it and now everything works again. Thanks Nickjvr for leading me to this solution. Keep up the sterling work!
Any tread on how to remove it. I started habing these problems a week ago
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