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Thread: obd2 and ABS light ON

  1. #1
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    obd2 and ABS light ON

    Could someone help me to determine the reason of ABS light on, if by obd2allinone(USB) no DTC in car (GM Alero 1999) computer? I tseems to me that one of rear weel bearing is going to fail, but which one?
    And not clear why there is no trouble code in ECU, if ABS light is on?

  2. #2
    MySQL Error MatrixPC's Avatar
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    no one can reset/check ABS light except dealer. Maybe ... .maybe local garage can do it (but I really doubt).
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  3. #3
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    Question odb2 and ABS lights ON

    But how the dealer doing ABS reset, through the obd2 16 pin socket?

  4. #4
    Newbie jyaron's Avatar
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    Cool

    Any ligitimate aftermarket scan tool is easily capable of obtaining, displaying and clearing body/chassis codes.

    Don't be fooled by imitation aftermarket scan tools who claim they are the best.
    Attached Images Attached Images   

  5. #5
    Banned Motorcity's Avatar
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    Quote Originally Posted by sapog
    But how the dealer doing ABS reset, through the obd2 16 pin socket?
    (EDIT) Some ABS controllers (computer) are not accessed by the OBDII connector. The interface is seperate. Dealers and repair shops with quality (read big $$) scan tools with adapters and loads of up to date software are what is needed to read ABS trouble codes. If the ABS light is on, you will Not have ABS braking, only normal braking. Which means your wheels will lock up and you will skid if you jam on the brakes hard enough.
    Go to your local GM dealer, pony up the 70.00 or so for an hour labor and have them diagnose the ABS problem. If you suspect you have a bad wheel bearing, chances are that you may need a new wheel speed sensor, or the exciter ring, or both. You may also just have a bad wire or connector at one of the wheel speed sensors. Then again, you may have other problems.
    Have a Licensed, Certified ABS tech look at it. Don't chance your life or someone else's when it comes to your brakes by half assing it.

  6. #6
    Banned Motorcity's Avatar
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    Quote Originally Posted by jyaron
    Any ligitimate aftermarket scan tool is easily capable of obtaining, displaying and clearing body/chassis codes.

    Don't be fooled by imitation aftermarket scan tools who claim they are the best.
    Hey, what scan tool is your screen shots from?

  7. #7
    Newbie jyaron's Avatar
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    Thumbs down

    Quote Originally Posted by Motorcity
    ABS controllers (computer) are not accessed by the OBDII connector
    absolutely incorrect

  8. #8
    Newbie jyaron's Avatar
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    Post

    Quote Originally Posted by Motorcity
    Hey, what scan tool is your screen shots from?
    The best in the business.
    www.obd2.com

  9. #9
    Banned Motorcity's Avatar
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    Quote Originally Posted by jyaron
    absolutely incorrect
    No, my statement is correct.
    Granted, some, if not most newer vehicles allow access to the ABS or Air Bag modules via the OBDII connector, but a lot of vehicles have a seperate connector. Even new enough vehicles that are OBDII compliant.
    See pic. This is a 1996 Mustang ABS connector. Clearly NOT an OBDII connecotr as you suggest I am wrong about.
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  10. #10
    Newbie jyaron's Avatar
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    Transition year vehicles are a grey area.
    This '96 Mustang Ford EEC-IV connector only has ABS DTC capability... no real time data.

    Typical '91 to '95 Fords will have these 2 'doghouse' connectors.. one for ABS and one for PCM-or-ECM realtime data at 2400-to- 19200 baud per Ford's proprietary time division multiplexed comm protocol.This PHY and Network layer protocol was a bear to write and is quite complex compared to the standardized VPW,PWM and ISO NRZ UART stuff.

    Many of '96 and up Fords transitioned to ABS using FISO on pin 7 instead of standard diff PWM on pins 2/10.

    The OEM in question with this post is GM. The 2 popular protocols on GM are VPW on pin 2 and 8192 UART (GM XDE-5024) on pin 9. The bulk of GM ABS is VPW.. however, some Kelsey-Hayes ABS is unsolicited 9600 baud NRZ UART ASCII on pin 12. Rogue or re-badged to GM vehicles may resort to ABS using KWP on pin 7.

    None the less, all GM have ABS accessible on 16 pin OBD2 DLC.

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