whilst testing out the v27 upgrade this afternoon i noticed that the wheel speed sensor was showing 0 all the time.

i did a nav retofit a few months ago and part of the install meant i had to run a wire from the nav harness to behind the instrument cluster and splice into pin 19 on the black connector (usually its pin 1 of the blue connector but mine only has low obc) and i also had to run a wire to pin 38 of the light module to get a reversing signal.

now i know the reversing signal works ok as the direction of travel changes properly but its the speed sensor thats bugging me as i'm 100% sure i did it right.

you guys have been talking about the actual harness being at fault, is there any way of checking if this is the case with mine??? i used the harness from retrofit kit part number 65900303579 in a 2001 e39.

thanks for any help given.