Mercedes SLK230 abs warning light

Ginko

• 19396 Answers
• Posted on Jul 15, 2008

SOURCE: ABS WARNING LIGHT ON VOLVO V70 1997

ABS light comes on with ignition then should go off when you start the car.
If abs sensor does not turn off after disconnecting the battery, then there is a real problem, a faulty sensor or ABS malfunctioning.
When the ABS led comes on immediately after you start the car and stays on usually is one of the relays.
The main one is called surge arrester relay, if it is faulty usually there have been an overvoltage.
There should be two more, usually located behind the black plastic cover of the ABS.
Testing and changing the faulty relay can fix the problem.

If light turns off on startup, and comes back on when you reach some speed, usually you need to check the wheel sensors. You test them unplugging the sensor located behind the wheel and testing it for continuity with a multimeter.
Use Haynes manual to find locations and specs of relays.
Contact a qualified mechanic if you cannot fix it yourself, problems with ABS may compromise safety of the vehicle.

Marvin

• 85242 Answers
• Posted on Nov 14, 2008

SOURCE: abs warning light stays on no problems with brakes

The brakes will feel fine until u need the ABS, when the light is on the ABS is disabled. You need to have the ABS system tested for trouble codes, if the light is on there will be a code or codes.

SOURCE: after replacing the left front wheel bearing on a 2003 ford focus, the abs and traction warning light stay on

The bearings on the wheels has to be installed one way only, the rotor ring is built into the bearing and if installed the wrong way round the sensor cant pick up the wheel speed causing the ligt to be switched on in the cluster. The diagnostic equipment should pick this up as a fault once the car has been driven, it will see the sensor when you do the diagnostic if the car is standing still but once the car is moving and no signal is send from that wheel it would register a fault into the memory of the PCM that you would be able to retrieve later.
There is a way for you to test the sensor yourself by using a multimeter set on volts, you jack the vehicle up at that wheel, install a vehicle stand to support the vehicle to be safe, disconect the wheel speed sensor and probe the two wires into the sensor, spin the wheel by hand and a small amount of current will be produced meaning the the sensor is working and the wheel bearing is installed the correct way, you can also do a continuaty test on the sensor by switching the multimeter onto ohms, but be very carefull, if this sensor has three wires you cant do the continuaty test because of the integrated circuit in the sensor, the three wire sensors opperate on a voltage from 5Volt and it would be destroyed by the multimeter opperating on 9Volt.
If the continuaty test passes and the bearing is installed the correct way, the most comon fault would be a break in the wiring leading to the PCM
Hope this will be helpfull.

SOURCE: 1999 Lincoln Navigator ABS warning light turns on?

One of the ABS sensor's is bad or a hub bearing is bad.Could be front or rear.

SOURCE: 2007 Dodge Caravan ABS light stays on after

Common issue when a wheel sensor gets faulty.On every wheel there is a sensor which informs the ABS system about wheel speed.If any of them is broken then the ABS system locks up and you get the warning light.In this case your brakes are working just as fine but you dont have ABS so wheels can block when you push the brake hard enough.Trouble code reader can tell you which one is faulty.