Well, went back again. Seemed to spend too long actually locating modules but...cleaned (that is, sprayed with contact cleaner) EPS (Electronic Power Steering) and Instr. Panel/Body Electrical connectors. Cleared remaining fault codes and drove around the estate again. It remained clear of codes so left it for the garage to test. I forgot to scope the alternator output due to being overwhelmed by feeling of euphoria and elation at being code free!!
It did raise a number of still unanswered questions. According to the block diagram the Canbus (hi-speed) 'chain', as seen from the diag. socket, was through the BCM (called the instrument panel/body electrical), through the EPS (power steering), then some modules hanging off the bus on 'stubs', then through the ABS, with the ECM at the end. As I had continuity from the diag. socket through to the ECM, and a proper waveform at the socket, it seemed all the wiring was intact! I still don't know if modules 'talk' directly between themselves, or if the BCM acts as the mail-room and gathers and re-directs messages between modules.
I left the car error free, and I haven't heard from the garage since so perhaps it's a fix. I guess I'll know for sure when I get paid!!
Nick
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