Brake Lining Indicator - sensor issue
 

I have a 1987 325is. I noted when I got the car a short while ago that the brake lining and ABS indicator lights did not light when initially starting the car. ABS worked and the front brakes were in good shape, so I figured bad bulbs & could wait a bit.
I today I noticed a bit of a squeal in the right rear and I remembered that the Lining lamp was out, so time to replace. Pulled the cluster & the lamp for the ABS bulb was just hanging out of its socket but it worked so that was a quick fix.
Next I saw that there was no brake lining lamp at all in the socket, so I replaced it and sure enough it came on. O.K. Now to check the right rear first. As expected, I found that the lining was thin, but of more interest, the sensor was completely missing! Searching around I found the sensor harness wire. It had it's end cut off, the wires twisted together and soldered then wrapped with electrical tape and looped back into a wire tie out of the way.
I then checked the left front sensor with a multimeter and it was OK.
With the rear wire shorted and the front good, shouldn't the light be out?
Does a fault code need to be reset?
Any suggestions on repairing the harness?
Thanks!
-Chris

Sounds like someone has joined the two wires at the rear together so that the light doesn't come on. Joining the wires closes the circuit, if you de-solder them and reinstall the sensor, it should work ok, no need to re-set a fault code.
see the post above re resetting the warning light

Unfortunately, the light remains on with the one good front sensor the cut rear harness twisted and soldered. Where does the rear wire sensor wire route? I'd like to check the whole run for continuity. If it's open somewhere, I'd like to use the old one to fish a new pair through the run.