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Thread: DSC mulfunction

  1. #1
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    Question DSC mulfunction

    I have 2000 BMW 323i and recently I have replaced the inner/outer tie rods.
    After the replacement I took the car to the mechanic shop for the wheel alignment.
    20 minutes after I drove away from the mechanic shop, all of the sadden 3 indicator lights came on my dashboard: 1) DSC; 2) ABS; 3) Brake.
    I phoned back to the mechanic and explained the situation. I asked him if this is something related to the wheel alignment activity. He responded that unlikely but invited me back to check the next day.
    The next day the indicator lights disappeared. Then a day after they came back On, but this time just DSC and ABS.
    I drove to mechanic shop, he looked if there are any sensors that could of gotten damaged. It seems that all 4 ABS wheel sensors were intact. He suggested leaving the car for a day with him, so he would connect his tester and drive around to see what is happening (I haven’t done that yet, can’t find a time when I don’t need a car for a day).
    As soon as drove away the lights disappeared.
    Then a day after all 3 indicator lights came back On.
    I ran my own Autel MaxiDiag Elite MD802 tester and found the following fault code:
    31 ; DSC: Wheel-speed sensor, rear left
    I deleted the code in order to see if this might be a glitch, but a day later all 3 lights again came back.
    I ran another test and this time I found 2 fault codes:
    A8 ; DSC: Voltage supply, sensor
    31 ; DSC: Wheel-speed sensor, rear left
    Since then all 3 indicator lights were spontaneously coming On and Off.
    On top of this there are instances when just the DSC indicator comes On for few seconds and at that moments the radio turns Off. As soon as DSC indicator disappears the radio turns back On.
    Has anyone here experienced the same situation?
    What can be done?

  2. #2
    dworthy's Avatar
    dworthy is offline Wagon meister :) BMW Tech Expert
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    I would suggest getting into the ABS/DSC ECU and watching the live data. In INPA there is a screen for you to watch the wheel speeds for each corner, and if one drops, you will see it.
    Darin
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  3. #3
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    I have Autel MaxiDiag Elite MD802 tester . Will this gadget do the same job?

  4. #4
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    I would bet one of the TINY wires on the left rear sensor pigtail is frayed - causing all of lights.

  5. #5
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    You have the trifecta. Welcome to the club. If you find a solution please post it here when you're done.

  6. #6
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    Yes, please.
    Remove all four wheel speed sensors from the car and check with a digital meter. When measuring in ohms you should get a reading in the hundreds or just below. Possibilty that if one of the sensors provides no reading that sensor should be replaced with a tested sensor, that should solve the issue.

  7. #7
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    Are there four wheel sensors? I thought it was driver front and passenger rear. Maybe I'm confusing cars. Anyway, the same happened to me when doing the same job. Changed the sensor and it went away.

  8. #8
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    Yes, please.
    Quote Originally Posted by TonyAngel View Post
    Are there four wheel sensors? I thought it was driver front and passenger rear. Maybe I'm confusing cars. Anyway, the same happened to me when doing the same job. Changed the sensor and it went away.
    The E46 cars have 4 wheel speed sensors, one on each wheel hub area. You might be thinking of the brake pad sensors Tony. They are on the front left and right rear and attach to the brake pad.

  9. #9
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    The DSC indicator still comes On for couple seconds and at that moments the radio turns Off. As soon as DSC indicator disappears the radio turns back On.
    What can be done with this?

  10. #10
    dworthy's Avatar
    dworthy is offline Wagon meister :) BMW Tech Expert
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    What have you done to get the car scanned for codes? With all the ECU's on that car, it is like fishing without a hook.
    Darin
    Current:
    16 220i Active Tourer Platinsilver MET (C08)/Dakota Black (PDSW), P7ACA, P7LDA, P7LHA, P9BDA, 6sp Manual - Wife's new toy!
    05 325it Electric Red(438)/Gray(N6TT) ZCW, ZSP 5sp Manual Back set cover, trunk mat, Euro Infra-Rot front windshield, and mud flaps! Mr. Wagon My new Winter car.
    05 M3 Imolarot II(405)/Gray(N5TT) ZCW, ZPP 6sp Manual C.F. Lip, CSL diffuser, SSK, Euro Infra-Rot front windshield and a trunk liner! Mr. Go_Fast Stored for the Winter
    Past:
    95 318is Montreal Blue Met (297)/Beige(K1SN) RIP, killed by an Idiot.
    84 M535i gray market Burgandy Rot Met/Black Leather Lowered by Intrax on bilies, poly everywhere, B&B cat back system, K&N, and a hitch! Da Beast - Still running w/400k+!
    91 316i euro Tizianrot/Gray cloth - E-36 w/M-40 RIP, but great on gas! Best was 38 MPG
    82 528i euro Saphire Blue Met/Blue Leather RIP
    79 525 euro Green/Green RIP
    79 318 Silver/Black - The first one that got it all started
    M-Flight Member

  11. #11
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    The codes indicate a wiring connection problem or failed left-rear sensor.Check, clean and swap wiring connections/rear sensors.
    Clear codes,rescan and observe if code transfers to right-rear,if so,replace sensor.
    Last edited by MIKYZZ4; 08-02-2017 at 03:12 PM.

  12. #12
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    Has anyone solved this problem? If so, how?

  13. #13
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    Just replace the left rear wheel sensor. You can try cleaning it but its just to replace it, clear the codes and see if anything comes back

    Sent from my VS988 using Tapatalk

  14. #14
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    Quote Originally Posted by dworthy View Post
    What have you done to get the car scanned for codes? With all the ECU's on that car, it is like fishing without a hook.
    I used Autel MaxiDiag Elite MD802 tester

  15. #15
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    Was a fault and fix ever found Yober?

  16. #16
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    Quote Originally Posted by MIKYZZ4 View Post
    Was a fault and fix ever found Yober?
    very strange i was about to replace the sensor, but the for a whole month the indicators and codes disappeared. So i'm waiting to see if the indicators will come back, then I will replace the sensor.

  17. #17
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    Thank you for the update.

  18. #18
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    For almost 5 months the indicators were quite. Today all 3 indicators came back on. I will be getting to it tomorrow (if the rain would stop for awhile).

  19. #19
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    Yeah just because it is intermittent and in your case months of intermittency doesn't mean the sensor isn't bad. I see a lot of wiring issues over time as the protective barriers wear out.


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  20. #20
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    It could be your ABS module. Mine was intermittent for months then on all the time. It was the module. Some can be rebuilt and some like the Ate module are considered not repairable. I put in a used module and had it coded. It's been working well since November.

  21. #21
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    Question

    the lights are off again .
    will wait for dry day to resolve this mystery.

    curry,wold my Autel MaxiDiag Elite MD802 tester be able to check the ABS module ?
    Last edited by Yober; 04-07-2018 at 12:39 AM.

  22. #22
    dworthy's Avatar
    dworthy is offline Wagon meister :) BMW Tech Expert
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    If the lights were on, a code or codes will be stored in the ABS/DSC ECU. I don't know about the Autel if it can do what you need.
    Darin
    Current:
    16 220i Active Tourer Platinsilver MET (C08)/Dakota Black (PDSW), P7ACA, P7LDA, P7LHA, P9BDA, 6sp Manual - Wife's new toy!
    05 325it Electric Red(438)/Gray(N6TT) ZCW, ZSP 5sp Manual Back set cover, trunk mat, Euro Infra-Rot front windshield, and mud flaps! Mr. Wagon My new Winter car.
    05 M3 Imolarot II(405)/Gray(N5TT) ZCW, ZPP 6sp Manual C.F. Lip, CSL diffuser, SSK, Euro Infra-Rot front windshield and a trunk liner! Mr. Go_Fast Stored for the Winter
    Past:
    95 318is Montreal Blue Met (297)/Beige(K1SN) RIP, killed by an Idiot.
    84 M535i gray market Burgandy Rot Met/Black Leather Lowered by Intrax on bilies, poly everywhere, B&B cat back system, K&N, and a hitch! Da Beast - Still running w/400k+!
    91 316i euro Tizianrot/Gray cloth - E-36 w/M-40 RIP, but great on gas! Best was 38 MPG
    82 528i euro Saphire Blue Met/Blue Leather RIP
    79 525 euro Green/Green RIP
    79 318 Silver/Black - The first one that got it all started
    M-Flight Member

  23. #23
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    Autel MaxiDiag Elite MD802 tester shows one fault code:
    31 ; DSC: Wheel-speed sensor, rear left

  24. #24
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    Replace the sensor already,
    you've received confirmation from your tester, multiple times.
    Let's clear up this damn mystery!

  25. #25
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    I'm not sure I used a Schwaben to read my codes. It indicated a bad module. It wouldn't reset the codes. I had to go to a shop to do that.
    Quote Originally Posted by Yober View Post
    the lights are off again .
    will wait for dry day to resolve this mystery.

    curry,wold my Autel MaxiDiag Elite MD802 tester be able to check the ABS module ?
    Last edited by curry; 04-08-2018 at 01:10 PM.

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