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General E46 Forum
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Old 02-24-2011, 06:26 PM   #1
penet05
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ABS, DSC, Brake Light

Hi,

Although I have been reading a lot from this forum, this will be my first post.

I recently bought a 00 323i. This is the third one I have. (I had to sell others because of relocation, etc.). Although currently it has more than 161K miles, it runs great. I put more than 4K miles on it so far.

Here is the problem: There was a freezing rain in my area 2 weeks ago. The car was running fine that day. Two days later when I start the car in morning (the first start up after the freezing rain), yellow ABS, DSC lights and red brake lights pops-up in the dash. If I drive the car for 10 minutes, then shut it off for a minute and restart, first the red brake light disappears then the ABS and DSC. Then I don't see those lights throughout the day. After reading numerous forums, first, I changed the battery. However, it did not solve the problem. When the car is sitting (24 hours) I read 12.67V from the battery. When the car is running it is around 14.03V, when the high beam and heater is on, it is around 13.87V. Also, since those lights pop-up when the ignition turned to ON position (not cranked), and do not disappear by themselves, I think the problem is not the alternator as well.

I have read about ABS speed sensor problems. Do you guys still think my symptoms can be because of those sensors, even though if I only see those lights in cold starts?

Any help appreciated.
Thanks.
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Old 02-24-2011, 06:28 PM   #2
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try topping off your brake fluid. low brake fluid tends to set those light off.
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Old 02-24-2011, 06:31 PM   #3
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Thanks for the quick response. However, my brake fluid is full. The red light is for the hand-brake.

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try topping off your brake fluid. low brake fluid tends to set those light off.
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Old 02-24-2011, 08:18 PM   #4
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Originally Posted by e36-2.0 View Post
try topping off your brake fluid. low brake fluid tends to set those light off.
Try having the brake fluid flushed. The fluid is not supposed to have any water in it, but it absorbs water over time. It doesn't seem as if the brake fluid should freeze at your house, but I don't know what your weather has been.

The red brake light is telling you there is a problem with the braking system, typically this is a problem with the fluid. If the brake system is reporting problems, the ABS and DSC are not going to work, and the lights to these systems will be turned on to inform you the systems are offline.
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Old 02-24-2011, 06:32 PM   #5
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its your rear driver side speed sensor 100%
The exact same thing happen to me...
the lights would turn off after driving the car for a little if i shut it off and then back on.

first try to clean the sensor as they are very expensive..
if that doesn't work just replace it..
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Old 02-24-2011, 06:50 PM   #6
penet05
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Thank you for the response. Do you know why it is the driver side? or is there a "functional" difference between the left and right rear sensors?



Quote:
Originally Posted by Another BM View Post
its your rear driver side speed sensor 100%
The exact same thing happen to me...
the lights would turn off after driving the car for a little if i shut it off and then back on.

first try to clean the sensor as they are very expensive..
if that doesn't work just replace it..
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Old 02-24-2011, 07:00 PM   #7
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I got the ABS/ DSC/ Brake lit up and it was my passenger rear speed sensor. If you want to be 100% sure you can get your DSC codes read for around $100. The codes identify the wheel. You can check the speed sensors in all your wheels, start at the rear. It's held by one torx bolt and prys out. If there is one that is scuffed with maybe some brass visible under the black plastic, probably that is the speed sensor the Dsc diagnostics was flagged.
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Old 02-24-2011, 07:15 PM   #8
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Quote:
Originally Posted by xi_ter View Post
I got the ABS/ DSC/ Brake lit up and it was my passenger rear speed sensor. If you want to be 100% sure you can get your DSC codes read for around $100. The codes identify the wheel. You can check the speed sensors in all your wheels, start at the rear. It's held by one torx bolt and prys out. If there is one that is scuffed with maybe some brass visible under the black plastic, probably that is the speed sensor the Dsc diagnostics was flagged.
I thought there isnt any speed sensors in the front.. Is there?
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Old 02-24-2011, 07:43 PM   #9
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I thought there isnt any speed sensors in the front.. Is there?
They are needed on all wheels for the ABS at least on the xi. I pulled all 4 of my speed sensors out to clean and inspect them.
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Old 02-24-2011, 07:47 PM   #10
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Wow how many times are you people going to tell them the wheel speed sensor fixes it. There are so many things that can cause the abs and Dsc lights to go on. get the codes read before you put random parts on your car.


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Old 02-24-2011, 08:04 PM   #11
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Quote:
Originally Posted by snowborder142190 View Post
Wow how many times are you people going to tell them the wheel speed sensor fixes it. There are so many things that can cause the abs and Dsc lights to go on. get the codes read before you put random parts on your car.


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OMFG thank you!!!!! Finally someone smart.

OP and everyone else, please read this damn thread here:

http://forum.e46fanatics.com/showthr...648&highlight=
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Old 05-01-2012, 03:53 PM   #12
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OMFG thank you!!!!! Finally someone smart.

OP and everyone else, please read this damn thread here:

http://forum.e46fanatics.com/showthr...648&highlight=
I was going to post the same thread. It also points out that cleaning the sensor won't do a damn thing, but people continue to post that crap on here.
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Old 05-01-2012, 04:01 PM   #13
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I was going to post the same thread. It also points out that cleaning the sensor won't do a damn thing, but people continue to post that crap on here.
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Old 07-12-2011, 04:26 AM   #14
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Quote:
Originally Posted by snowborder142190 View Post
Wow how many times are you people going to tell them the wheel speed sensor fixes it. There are so many things that can cause the abs and Dsc lights to go on. get the codes read before you put random parts on your car.


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Really? Its strange how for my car (and others on here) taking the sensors out and cleaning the metal filings off of them fixed this exact problem. My lights have not came back on in over six months now. But by all means go to a dealer and spend $100 getting the codes checked first instead of trying something at home that costs an hour of your time. LoL
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Old 07-12-2011, 09:20 AM   #15
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Really? Its strange how for my car (and others on here) taking the sensors out and cleaning the metal filings off of them fixed this exact problem. My lights have not came back on in over six months now. But by all means go to a dealer and spend $100 getting the codes checked first instead of trying something at home that costs an hour of your time. LoL
here you go broski:

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cleaning a wheel speed sensor won't affect it in the slightest since it is likely a Hall or VR sensor, which are immune to dirt, grease, rocks, plastic, etc... The only thing that could throw it off is if a magnet was attached to it.
truth.
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Old 07-12-2011, 01:06 PM   #16
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here you go broski:



truth.
Well ok. Go with what feels right in YOUR head.
I am perfectly ok with ONLY cleaning them and all three dash lights NOT being on anymore.
BTW do you "take it to a shop first" guys work for a BMW dealer?
These forums I think are for people who want to fix their cars on their own but with a lil help from others.
But hey, call the dealer. I garantee he will also insist you bring the car in EVERY time.
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Old 02-24-2011, 08:20 PM   #17
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Old 03-13-2011, 01:21 PM   #18
penet05
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Error Codes

Thank you for the all comments. Since the closest dealer was more than 50 miles away, I read the codes with INPA.

The error codes for ASC/DSC is attached as image. I am a little bit unsure about the codes. Therefore, please correct me if I am wrong. Do I need to change front left speed sensor and Steering angle sensor? The left rear sensor is also listed in the error list but the error frequency is shown as 0. I guess that sensor is okay!?

Also during this week my speedometer worked on and off. Do you think do I need to look other modules as well?

Thank you for your input.



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Old 03-13-2011, 01:53 PM   #19
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Quote:
Originally Posted by penet05 View Post
Thank you for the all comments. Since the closest dealer was more than 50 miles away, I read the codes with INPA.

The error codes for ASC/DSC is attached as image. I am a little bit unsure about the codes. Therefore, please correct me if I am wrong. Do I need to change front left speed sensor and Steering angle sensor? The left rear sensor is also listed in the error list but the error frequency is shown as 0. I guess that sensor is okay!?

Also during this week my speedometer worked on and off. Do you think do I need to look other modules as well?

Thank you for your input.
Clear the codes and drive the car and see which ones reproduce.
You can also see the value of the sensors as you move the steering or as the car moves...Which ever one that isn't throwing a good number is bad.
Also, if your speedo didn't work then most likely it was your rear wheel speed sensor that went out.
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Old 03-13-2011, 09:57 PM   #20
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It looks like the errors that happened 254 times are the front left sensor and the steering angle sensor. The rear sensor had a frequency of 0. Replace the front left sensor first and search for steering angle sensor DIYs.
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