Iâ€™ve been trying to finger out why my ABS and hand brake light will not go out. I bought a Hawkeye Diagnostic tool and ran tests on the Wabco ECU, the Hawkeye reports no faults. When you turn the ignition key the traction control light goes out, the ABS light goes out for a second and then comes back on, (this is normal the ABS unit is self checking) but the hand brake light stays permanently on.
At first I thought the ABS unit must be faulty so I rang WABCO technical support, they advise if the ECU isnâ€™t reporting any faults the unit the ABS system is working. If I brake suddenly when driving you can feel the ABS working so they must be correct
I then turned my attention to the warning light console. I changed the unit, no change. I then decided to rewire the warning light panel as if the unit wasnâ€™t receiving an ABS signal (you need to insert links). I done this and still have the two warning lights.
On the back of the warning light panel there are two plugs, if I unplug the plug carrying the ABS signal and the handbrake signal, I shouldnâ€™t have any of the two warning lights, but guess what I still have the warning lights. I canâ€™t understand why because there unplugged. Iâ€™ve checked all the earths, Iâ€™ve even tried to earth pins individually, with no effect.
The garage told me to change the brake fluid; Iâ€™ve done this and still have the two lights.
It must be a wiring problem, Iâ€™ve checked everything I can, has anyone had a similar problem or can anyone point me in the right direction?