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Abs problem Anti-lock brake system light comes on as well as the traction control light and brake light gear 1999 Bmw 540i 6 speed

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  • 208 Answers

It sounds like maybe the ASC/DSC control unit may be bad. I would first check the RR wheel speed sensor for damage or water ingress. Unless you know someone that has a scanner, I would take it to your local dealer and let them scan your system.

Posted on Mar 11, 2009

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ABS & Traction control light are on, what is causing this?


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Feb 05, 2016 | Cars & Trucks

1 Answer

What does it mean when my anti-lock brake light comes on and the low traction light comes on and shuts off?


You need to have the ABS system scanned. You probably have a bad wheel speed sensor. most likely located in one of the hub bearings meaning; you may have to replace a hub wheel bearing assy with the faulty sensor. Traction control uses the same speed sensors as ABS. when the warning lights are on the system is not working.

Jan 21, 2016 | 1995 Chevrolet Lumina

2 Answers

My ABS light is on and off on a 2006 Mercury Mariner. Do I need to do something to get this light to stay off


SECTION 206-09: Vehicle Dynamic Systems 2006 Escape/Mariner/Escape Hybrid/Mariner Hybrid Workshop Manual DESCRIPTION AND OPERATION Procedure revision date: 03/29/2005 Anti-Lock Control adobe.gif Printable View (63 KB) The ABS consists of the following components:
  • Hydraulic control unit (HCU)
  • Anti-lock brake control module
  • Front and rear wheel speed sensors
  • Front and rear wheel speed sensor rings
  • Stability control sensor cluster
  • Stability/traction control switch
The ABS prevents wheel lock-up by monitoring the wheel speed sensors and actuating the HCU modulating the brake pressure to prevent wheel lockup. By preventing the wheels from locking up, the driver is able to maintain steering control and stop in the shortest possible distance under most conditions. The traction control system utilizes the same components as the ABS to prevent wheel spin and help maintain vehicle control during acceleration. The roll stability control (RSC) system utilizes the same components as the ABS and the traction control systems and also monitors the steering wheel position sensor and the stability control sensor cluster to assist in stabilizing the vehicle during abrupt maneuvers.
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The ABS module is self monitoring. The module will carry out a preliminary electrical check of the hydraulic pump motor by turning the pump ON for approximately 1/2 second either when the ignition switch is turned to the RUN position and the brake pedal is not pressed or when the vehicle is in motion and at vehicle speeds above 20 km/h (12 mph). The ABS module will also carry out a wheel speed sensor self-test by sending a reference voltage to all of the wheel speed sensors through their circuitry when the ignition switch is turned to the RUN position, with or without brake pedal application. If a malfunction is detected in the pump or wheel speed sensors, the ABS module will shut down and disable the anti-lock system. Normal power assisted braking, however, remains.
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Visual Inspection Chart
Mechanical Electrical

  • Base brake system
  • Brake booster vacuum hose
  • Hydraulic control unit (HCU)
  • Steering components and suspension components
  • Tire size
  • Wheel speed sensor ring
  • ABS module
  • Battery junction box (BJB) fuse(s):
    • 19 (40A)
    • 22 (40A)
  • Brake fluid level switch
  • Brake pressure transducer
  • Smart junction box (SJB) fuse(s):
    • 6 (15A)
    • 34 (5A)
  • Stoplamp switch
  • Wheel speed sensor
  • Wiring, terminals or connectors


You may need to have the dealer run a scan test to determine the DTC fault codes. Then go from there. Autozone can't read these codes as tehy are chassis codes. They only can read powertrain codes.

Good luck. please rate.

Jan 25, 2011 | Mercury Mariner Cars & Trucks

1 Answer

What is the function of ECT in Toyota hi ace 2L turbo diesel?


E electronically C controlled T transmision
  • Sometimes it has two sometimes three settings....
  • Power which holds the gears longer before change up....
  • Economy....gears change normally....
  • Snow....traction control...This last mode uses the ABS
  • A anti lock B brake S system
  • The ABS system automatically monitors the rotational speed of each wheel, and when brakes are applied, releases any brake about to lock up, independent of the others.
  • This is done because when wheels lock and skid, traction and control is lost....
  • Traction control brakes any wheel which begins to lose traction under power, spinning too fast and thereby also loosing traction if it was not controlled...
Hope this answers your question
It can be a slippery subject but we can slide across it....In a controlled way naturally
Best regards Johngee10

Oct 31, 2010 | 1991 Toyota Camry

3 Answers

Traction control and anti-locks(ABS) lights come on.


Traction control and anti-locks(ABS) lights come on there is sensors that are pluged in behind the rotors check and see if they are disconected or loose sometimes when you change your brake pads they might come loose and not making contact.

Jul 06, 2010 | 1998 Cadillac DeVille

2 Answers

Warning light on are trac off, anti-lock, brakes, service engine


You need to have the abs system scanned for codes. You likely have a bad wheel speed sensor on one of wheels.

Apr 21, 2010 | 2000 Oldsmobile Intrigue

3 Answers

ABS light will not reset on BMW R1100 rt after replacing abs sensor


you have to check the wires going to the abs, could be a bad wire, if they are ok then either the new sensor is malfunctioning, or the abs sentral is fried

Jan 17, 2010 | 1998 BMW R 1100 RT (ABS)

1 Answer

Traction light stays on as well as my abs would come on and stays on and clicking noise during braking.


Sounds like you have a problem in the front brakes or a front wheel speed sensor. A common cause for a Traction light is a faulty front ABS wheel speed sensor or harness. When the Anti lock brake computer sees a problem in the ABS syetm, it disables traction control as well.

Mar 12, 2009 | 2003 Oldsmobile Silhouette

1 Answer

Problem with my cruise control and ABS light on 03 Explorer


Anti-Lock Control —Vehicles Built After 03/2002 The 3-channel anti-lock brake system consists of the following components:
  • front wheel speed sensors
  • front wheel speed sensor rings
  • hydraulic control unit (HCU)
  • Anti-lock brake control module (ECU)
  • rear wheel speed sensor
  • rear wheel speed sensor rings
  • yellow anti-lock brake warning indicator
The 4-channel anti-lock brake system with traction control and stability assist system consists of the following components:
  • active brake booster with integral solenoid
  • brake booster release switch
  • front wheel speed sensors
  • front wheel speed sensor rings
  • hydraulic control unit (HCU)
  • stability assist module (ECU)
  • stability assist event indicator
  • lateral accelerometer
  • longitudinal accelerometer (4x4)
  • rear wheel speed sensors
  • rear wheel speed sensor rings
  • steering wheel position sensor
  • yaw rate sensor
  • yellow anti-lock brake warning indicator
  • brake pressure transducer
  • traction control switch
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I suspect the abs issue is causing the speed control not to work if it happened at the same time the cruise control stopped working. When the yellow ABS light comes on, it means the ABS is dactivated. You may have a faulty accelerometer which senses acceleration and yaw (side to side lean). I have not seen a bad one but you said it is sensitive to acceleration.
I would unplug it and see what happens. The connector should have a small tab to depress so you can pull the connector out.
Here is where it is:

Accelerometer Removal and Installation
  1. NOTE: The accelerometer is located under the center, rear passenger seat carpet. (I think you have to remove seat for access).
    Cut the carpeting along the perforations.
  1. Disconnect the electrical connector.
  1. Remove the nuts and remove the accelerometer.
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Have dealer hook up tester and pull fault codes if you can't find an easy solution.
Some background info
  • A malfunction in the anti-lock brake system will cause the anti-lock brake control module to shut off or inhibit the system. However, normal power-assisted braking remains.
  • Malfunctions are indicated by the yellow ABS warning indicator in the instrument cluster.
  • The anti-lock brake system is self-monitoring. When the ignition switch is turned to the RUN position, the anti-lock brake control module will carry out a preliminary self-check on the anti-lock electrical system indicated by a three-second illumination of the yellow ABS warning indicator in the instrument cluster.
  • During vehicle operation, including normal and anti-lock braking, the anti-lock brake control module monitors all electrical anti-lock functions and some hydraulic operations.
  • Each time the vehicle is driven, as soon as vehicle speed reaches approximately 20 km/h (12mph), the anti-lock brake control module turns on the pump motor for approximately one-half second. At this time, a mechanical noise may be heard. This is a normal function of the self-check by the anti-lock brake control module.
  • Pedal pulsation coupled with noise while braking on loose gravel, bumps, wet or snowy roads is normal and indicates correct functioning of the anti-lock brake system.
  • Warning Lamp Indicator
    The anti-lock brake system (ABS) uses the yellow ABS warning indicator to alert the driver of a malfunctions in the ABS.
    The yellow ABS warning indicator will come on to warn the driver that the ABS has been turned off due to a symptom that exists in the ABS. Normal power assist braking remains but wheels can lock during a panic stop while the yellow ABS warning indicator is illuminated.

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    Please report back, I am curious if that is what it is. Good luck

    Mar 03, 2009 | 2003 Ford Explorer

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