Question about 2004 Volvo XC70

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ABS light flashes when cornering at low speeds. How can I determine which sensor is bad?

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  • stark1 Nov 10, 2010

    I appreciate your answer, however, what I would like to know, is how to determine if one of the 4 sensors is bad and how I would check to see if it is bad. I know they can be dirty, brake pad dust buildup, magnetic particles, etc. If the sensors are clean at the tip, and the wiring is good, how do I check the sensor itself?



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I alread know you will not like my answer but I will explain it.Each tire has a wheel speed transducer which 'tells' a computer how fast a tire is rotating.Then the computer sends a feedback signal to the brakes telling them to engage/disengage as rapidly as possible without causing the car to skid(prevent lockup of brakes).If one were to go bad,you would have to buy a new one,take off the tire and the transducer,replace them,and test drive.One tire could easily take an hour.If that one wasn't bad,you would proceed to the next,next,next.If the problem was the computer,nothing would change.If it were the brakes,you have a whole new set of tests to do.Time is worth money,so even if the computer test costs $80 or more,you will save time,probably aspirin,and migraines.The computer test is very specific and will only take a few minutes.ABS is a good system,but with more technology comes more problems unfortunately.Greg Also,if you haven't changed the battery yet,be prepared to have to unlock the radio when you do.A normal car battery lasts about 6 years.If you call a dealer,they normally will provide the code and process for free.If they want an outrageous amount of money,some dealers want over $100,seriously,there are sites online which do it for $10-$15 perhaps.I think some of the higher end car makers want the outrageous amount,perhaps yours,Mercedes,Cadillac,Jaguar,etc.You will need your VIN and that should be all.Good luck,Greg

Posted on Nov 10, 2010

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Hello! Does the problem occur in both left and right turns? Give both connectors of the front sensors a visual inspection...Look for loose, strained or frayed wiring...Check with wheels at full lock (left and right)...Left sensor= Brown/Pink...Right sensor=Yellow/Gray..

The ABS Pump Motor may be at fault...It has been known to cause problems on XC70's...But before we jump to the pump...Lets make sure the sensor harness and connectors are not being strained when cornering...Below is a diagram of component locations for your vehicle...

ABS light flashes when cornering at low speeds. - saailer_6.jpg
The encircled device is the control Module..............Guru.....saailer

Posted on Nov 09, 2010


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