I have a 2012 R1200R BMW, took out for first ride today. The ABS & warning lights came on after 125 miles. Took it home, hooked up to GS 911.
it had 2 faults, Low voltage detected & rear sensor unavailable. They both reset & are clear. The ABS light stays on & the ABS disable switch shows activated.
How do I turn that switch back on? \
Thank you in advance first time user
You will possibly not be able to turn it on under the circumstances you have. There is also a difference between clearing the fault code and resolving the fault that caused the code. It would appear that you have cleared the code but not resolved the fault. If you ran the Autoscan again after cycling the ignition, you would most likely find that the
"Rear Sensor Unavailable" error is back. The sensor is crucial to the reset and functioning of the ABS unit.
When you turn the ignition on the ABS pump will initialize, check all related components (front and rear sensors included) and wait for the wheels to start rotating. When they do, the front and rear sensors measure their rotation and the pump is activated (at this point the light goes out). You can then choose to manually disable the ABS unit using the switch provided (in which case the light will come back on).
However, should the initialization and check pick up an error (in your case a rear sensor that is "Unavailable") it will not be able to complete the initialization process, and the ABS light will remain on and the unit disabled until the physical fault has been resolved. Since the unit has been disabled due to a physical fault, you will not be able to turn it back on.
My suggestion would be to check the wiring to the rear sensor. Have you had the rear wheel removed lately? If so, check that the rear sensor wiring has not pulled out of the retaining clip. When it does, it will come in contact with the rear brake disk, which subsequently rubs through the wiring, causing the sensor to fail.
Also check the wiring further up the swingarm. It disappears under a small plastic cover on the torsion bar together with the rear brake pipe. In front of the plastic cover it leaves the torsion bar and is cable tied to the frame. Often the cable gets pinched between the torsion bar pivot point and the frame, resulting in the cable being cut as the swingarm moves up and down.
