Well you were right vocky, one of the wires was damaged, and I just had to melt the plastic to get to the terminal and weld the wire again. Now the abs sensor light goes off,
The bad news is that I pushed the brake with the brake caliper off, then I had to remove the pads to push the piston back, and now I don't know how to put the retaining spring back again.
it seems quite tricky, any suggestion?
thanks