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General E46 Forum
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Old 12-27-2010, 06:10 PM   #1
JcLusso
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DSC / ABS / BRAKE Light HELP!!!

so down in ny we got a blizzsrd snd after driving down my block in my 2003 325xi my abs, dsc and brake light got stuck on. i have driven around alll day and its still on. Any help would be appreciated.
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Old 12-27-2010, 06:36 PM   #2
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Get the DSC / ABS codes read, Peake code readers can't read these codes. You will have to go to dealer or a good BMW independent shop with the equipment to read these codes.

A quick search using your thread title, finds 373 threads with info with DCS / ABS and Brake lights, here a few you might look through to learn about the ABS/DCS systems and issues.

http://forum.e46fanatics.com/showthr...bs+brake+light
http://forum.e46fanatics.com/showthr...bs+brake+light
http://forum.e46fanatics.com/showthr...bs+brake+light
http://forum.e46fanatics.com/showthr...bs+brake+light

Here is a good document on E46 DSC systems -
http://www.kinmak.com/downloads/doc/m3training/TSC1.pdf

The Xi version is a little different but the document should still be a good overview of the system.
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Last edited by shanneba; 12-27-2010 at 06:40 PM.
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Old 12-28-2010, 02:16 AM   #3
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Remove the wheels and remove and clean the speed sensor on each wheel. Check for damage to the top of these sensors.
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Old 12-28-2010, 07:37 AM   #4
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Originally Posted by xi_ter View Post
Remove the wheels and remove and clean the speed sensor on each wheel. Check for damage to the top of these sensors.
^^^ this....
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Old 12-28-2010, 07:42 AM   #5
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these lights came on 3 weeks ago and the car wasnt even moving!! after i restarted the car it was fine can cold affect these sensors?
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Old 12-28-2010, 09:34 AM   #6
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Originally Posted by xi_ter View Post
Remove the wheels and remove and clean the speed sensor on each wheel. Check for damage to the top of these sensors.
where are the sensors?? Can anyone please advise... picture maybe?
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Old 12-28-2010, 11:05 AM   #7
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each wheel has 2 wires leading to them one is the brake pad wear sensor the other is the speed sensor, you need a hex key to take off
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Old 12-28-2010, 11:34 AM   #8
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Drive it again on dry pavement, it should reset.
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Old 12-28-2010, 12:17 PM   #9
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Drive it again on dry pavement, it should reset.
the highways are clear and I drove about 2-4 miles on one. No luck.
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Old 12-28-2010, 11:02 PM   #10
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any light comes off, you need to read the code before you get help or fix.
PEAKE SCANNER OR OBD II or any other scanner can read code.
I have 325 XI 2002, both scanner can read those ABS/DSC code. (Even before, can read ABS/DSC code on X5-2003 too),
unless my cases not the same code?
For E46 enthusiastic/fannatic want to DIY & save $$$$, minimum should have Service manual , code reader & wrench set.
With out them, you may spend more $$$ then you save & some time you break more $$$ than save.
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Old 12-28-2010, 11:09 PM   #11
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Quote:
Originally Posted by dephantn View Post
any light comes off, you need to read the code before you get help or fix.
PEAKE SCANNER OR OBD II or any other scanner can read code.
I have 325 XI 2002, both scanner can read those ABS/DSC code. (Even before, can read ABS/DSC code on X5-2003 too),
unless my cases not the same code?
For E46 enthusiastic/fannatic want to DIY & save $$$$, minimum should have Service manual , code reader & wrench set.
With out them, you may spend more $$$ then you save & some time you break more $$$ than save.
Peake scanners cannot read DSC/ABS brake codes. You need to get the car hooked up to Autologic/MoDic/GT3 computer to pull the codes which is something only GOOD indy shops and dealers have.

OP. Its most likely your front abs pulse generator that is causing the problem if your brake light is NOT red. I suggest cleaning those first followed by a road test.
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Old 12-28-2010, 11:29 PM   #12
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This is what they look like after undoing the bolt and pulling them from the hub.They are located bottom right of each wheel. There is a cable you can follow coming from each sensor.
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Old 12-29-2010, 10:49 AM   #13
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Originally Posted by TrickTizzle View Post
Peake scanners cannot read DSC/ABS brake codes. You need to get the car hooked up to Autologic/MoDic/GT3 computer to pull the codes which is something only GOOD indy shops and dealers have.

OP. Its most likely your front abs pulse generator that is causing the problem if your brake light is NOT red. I suggest cleaning those first followed by a road test.
Pulse generator meaning the sensors on the wheels? Where is this pulse generator you speak of?

I also just got my OBDII to USB cable the other day so im going to try getting the DIS Software running so I can read the codes.
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Old 12-29-2010, 12:58 PM   #14
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my rims are pretty open so I was able to reach / see the sensor. they look like nothing is blocking them... what do you clean them with?
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Old 12-29-2010, 12:59 PM   #15
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Originally Posted by JcLusso View Post
Pulse generator meaning the sensors on the wheels? Where is this pulse generator you speak of?

I also just got my OBDII to USB cable the other day so im going to try getting the DIS Software running so I can read the codes.
ABS Pulse generator and Wheel speed sensors are the same thing. Take the wheel off and there will be a sensor behind the hub with a wire leading out.
Unscrew that with an allen key and clean sensor gently with a wire sensor...
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Old 08-07-2011, 08:15 PM   #16
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Originally Posted by xi_ter View Post
This is what they look like after undoing the bolt and pulling them from the hub.They are located bottom right of each wheel. There is a cable you can follow coming from each sensor.
Dude! "right side" you mean driver side?
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