ABS or Traction Control Warning Light? Bad Wheel Speed Sensor? Could be wiring harness.

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ABS or Traction Control warning light on? Bad Wheel Speed Sensor (WSS)? In most cases the OEM harnesses are exposed to the elements and over time can rub against parts of the under carriage causing the wiring inside to fray or in some cases completely break. Other than a visual inspection of the wiring harness, a voltmeter in the ‘ohms’ setting would verify the integrity of the wire.

The following procedures verify good continuity in a circuit with a Digital Multi-Meter (DMM).
1. Set the function to the OHM (Ω) position.
2. Disconnect the harness connector of the suspect circuit.
3. Checking the circuit side going to the wheel speed sensor. This connector will have two pins, connect the DMM leads to these two pins.
4. If the DMM displays low resistance (most ABS sensors measure 1.28-1.92 K ohms) the circuit is good, and more diagnostic tests need to be done.

How does the ABS sensor or Wheel Speed Sensor work? As the wheel spins, the wheel speed sensor produces a AC signal. The EBCM (Electronic Brake Control Module) uses this AC signal to calculate wheel speed. Other points of interest for a faulty ABS sensor circuit would be to inspect the tone ring and plug connections.

APDTY ABS Harness Repair Kit may be the best solution for a faulty harness.



ASE Certified Technician

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2 Responses

  1. Debbie says:

    How do you replace the wiring harness? Looking on several places on the internet and I can’t find directions. Thanks!

    2005 Pontiac Montana SV6

  2. Andrew says:

    This requires some wiring expertise.

    The best way is to solder the wires and protect them with heat shrink tubing.

    I just tried to repair the existing one on my GM and found the wire that goes from the hub to the main wire running to the front of the car to be a type that does not take solder. I tried to crimp them together, and I’m not sure if it didn’t work, or if the problem is elsewhere. I have already hard soldered the plugs under the car, just behind the driver seat. Those were all solderable.
    now I’m going to start locating the control modules to see if the connection is there, and re-replace the hub in case I got a bad one for a replacement.

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