Question about 1994 BMW 3 Series

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HI I HAVE A E46 323CI BMW AND HAVING PROBLEMS WITH MY BRAKES LIGHTS FLASHING ON AND OFF. ON THE DASH THERE IS A CAR SYMBOL WHICH ALSO ALERTS ME WHEN THE BRAKE LIGHTS ARE ON. WHILE THIS IS HAPPENING MY RADIO TURNS ON AND OFF AND MY STERRING CONTROLS INCLUDING MY HORN DO NOT WORK. IT HAPPENS MOST DAYS WHEN I FIRST TURN THE CAR ON AND CONTINUES FOR NEARLY 40 MINS. I HAVE CHANGED THE REAR BRAKE SENSOR AND THE BATTERY BUT IT STILL IS HAPPENING. HELP! EVA

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  • evestr Sep 17, 2010

    Thankyou Darklord, you are the Guru!. I will let you know what happens. Eva x

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Hi! Pretty much a PCM (powertrain control module) problem. The PCM has connectivity on all electrical current that runs inside the car including the engine, transmission, lights, etc. The PCM is like the brain of the car that when it's faulty everything else fails. As a first course of action, I strongly suggest that you have the PCM resetted. Hope this helps and thank you for using FixYa!

Posted on Sep 17, 2010

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Well this problem sadly isnt an easy fix. and it isnt the battery or the brake or any of those for that matter.. The problem is the main harness leading to the control panel on your dash. this is the same harness that controls your horn and accessories (radio etc) more than likely the harness needs replacing...

BEFORE!!!! you do that check 2 fuses,, the first is under the hood , in the fuse box ,, look for one labeled ACC that short for accessories hopefully thats slack so removing it and putting it back tightly will fix the problem..

the second is the next acc fuse located in the kick panel under the dash. Hopefully this is the slack on..

if not then you need to take it to a mechanic or shop to have the harness replaced (quite expensive) so I'm hoping its just a slack fuse. your problem is electrical so dont bother wasting money on the brakes and stuff it isnt those things..

Posted on Sep 17, 2010

  • Rishi Roshan Ali Sep 17, 2010

    no problem,, But i saw you accepted another experts solution,, did you get the problem sorted out (I dont mind) i just wanted to ensure you got the problem fixed :)..

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