If you do not have oscilloscope you could try connecting small high impedance speaker like from old phone, it's quite low data rate bus so I think if there is any data going you should here some noise.
__________________
Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
|