I'm running a 02 MCS
without sat nav or chrono pack
I've got a electrical sounding crackle coming from the steering column or rev counter. Its an on/off sort of sound that is still audible whilst driving but much more so at idle.
Turning the wheel when stationary quietens it down a bit - probably because the power steering drowns it out - but it comes back.
Took it to the dealer, who could detect it but claimed to have checked all connections and pumps and they are ok.