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      12-04-2012, 08:45 AM   #1
abehwang
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Yellow BRAKE, ABS, DSC lights are on!

Only during cold mornings (around 35F and under) the Brake light, ABS, and Traction control light all turn on. After a minute of driving they either go away or I have to pull over and turn off the car completely and start it back up again then it goes away.

What could cause this? it happened three days in a row. Now the mornings have been warmer (40F and up) and no lights.
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      12-04-2012, 11:51 AM   #2
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All three lights being on suggests that one of the wheel speed sensors is giving a faulty reading, and may be covered in metal or other debris. An improper reading from one of the wheel speed sensors will give you an error like that. There are other possibilities, but this is a good place to start as it's relatively easy for you or a shop to check the sensors.

You can also scan the car for codes, and see which errors are logged.
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      12-04-2012, 05:42 PM   #3
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Quote:
Originally Posted by Ilia@IND View Post
All three lights being on suggests that one of the wheel speed sensors is giving a faulty reading, and may be covered in metal or other debris. An improper reading from one of the wheel speed sensors will give you an error like that. There are other possibilities, but this is a good place to start as it's relatively easy for you or a shop to check the sensors.

You can also scan the car for codes, and see which errors are logged.
Thanks!
Where exactly is the wheel sensor located? I have a gut feeling its my right rear wheel because I hit a pothole with that one recently
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      12-05-2012, 10:40 AM   #4
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Check your battery too. If you have a multi-meter, set it to 20V on the DCV side and check your voltage when the car is off. If you are pulling 12.3 or lower, you need to charge your battery......A 'good' reading is at least 12.5 or higher. Your battery could be on it's way out, or the alternator is not charging correctly. Typically, the lights will come on when the battery starts to get low.

The fact that the battery is low when it's cold and then lights go away after it warms up a little makes me think that it could be that.......It may be losing it's charge as it sits overnight and then the alternator charges it up once you start driving.
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      12-06-2012, 12:08 AM   #5
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It sounds like a battery issue for sure. Instead of driving, turn your steering wheel lock to lock first and see if the lights go away. This calibrates the steering angle sensor. The calibration can be lost at low battery voltages, so it's the best place to start troubleshooting without scanning codes. If they go out, you know it's getting to be battery time.
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      12-06-2012, 10:18 AM   #6
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Quote:
Originally Posted by Bmw135er View Post
It sounds like a battery issue for sure. Instead of driving, turn your steering wheel lock to lock first and see if the lights go away. This calibrates the steering angle sensor. The calibration can be lost at low battery voltages, so it's the best place to start troubleshooting without scanning codes. If they go out, you know it's getting to be battery time.
What do you mean by turn your steering wheel lock to lock? Do you mean to turn the wheel all the way till it locks and cannot go further? Should the engine be on or just the electronics.
Sorry for the multiple questions. I'm not sure I understand your troubleshooting
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      12-06-2012, 11:23 AM   #7
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He's suggesting that you should start the car and while parked, turn the wheel all the way to the left, and then all the way to the right. This should calibrate the steering angle sensor.

If the lights go away, but come back later on, this could be caused by low battery voltage and the car forgetting the calibration settings as the battery voltage drops below minimum, as suggested by TC Kline and BMW135er. Definitely a possibility!
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      12-06-2012, 12:27 PM   #8
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Exactly. Thanks Ilia
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      12-06-2012, 02:57 PM   #9
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Hopefully we all help to resolve this!
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      12-17-2012, 03:18 PM   #10
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Let me know if any of this works. I am having the same issues.
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      12-18-2012, 02:12 PM   #11
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Let me know if any of this works. I am having the same issues.
I haven't tried what they have recommended me yet. The weather has been warmer and nothing has flagged. I'm in the clear... for now *crosses finger*
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