Join Date: Apr 2002
Location: Issaquah, WA, USA
ABS fault problem
Hi everyone, I'm having a problem clearing an ABS fault. Here's the whole story:
In June of last year I installed my aux fuel cell. It is a "tail-dragger", which means it has an auxiliary light for the license plate. I connected the wires for the light to the wires going to the middle lamp in the tail light housing, which threw an immediate ABS fault. I posted a query here and, within a few minutes, I had multiple responses telling me to tap into one of the other lamps, not the middle one, (what a great resource this list is!).
Well, I was on my way to California the next day for the Cal 24 rally and had to stop in Las Vegas to pick up a part at a race car parts house. While I was waiting for the shop to open, I re-wired the lamp wiring. After picking up the part, I went to Las Vegas BMW, (nice shop), and they took the bike right in and hooked it up to the computer. They cleared the ABS fault, rode the bike around the parking lot and pronounced me good to go. They gave me a print out of the fault, which showed a rear wheel sensor failure. I'd heard that the way BMW decided to have the bikes warn us of a brake or tail light failure is to trow the ABS fault, so I figured all was well. The shop didn't charge me for this and it was a great experience at an out-of-town shop.
So, I rode the bike for a few months until August. I was riding to work one morning and my ABS lights started flashing. I took the bike to my local dealer and the service tech hooked it up to the computer and tried to clear the fault. Every time he would start the bike it would go back into the fault mode. The computer showed the same fault code as the one I had from the earlier trip.
The tech did a check of the sensor wiring, (I had fixed the over-tight zip tie problem a few years ago), and he said the resistance checked out OK.
Well, I've got the new motor in the bike now and I would like to get this fault cleared. While I had the bike apart, I traced the sensor wiring and everything seemed OK. I'm considering just replacing the sensor, but I have a gut feeling that the problem is in the tail light wiring due to my earlier experiences.
What do you guys think?