Quote:
Originally Posted by Bendy
Hi all,
Lastly how does the diagnostic wire work? What sort of signal does it send to the Bluetooth unit or does the unit send a signal back. ...
Ben..
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I haven't 'played' myself, but the diagnostic wire is part of the 'Ring Diagnosis' circuit of the MOST connected MMI ECUs. The diagnosis wires from the ECUs are connected in a 'star' together with the Gateway.
When a diagnosis is requested, the Gateway pulses the diagnosis connection to 'wake up' the ECUs which send test signals on the optical loop.
Don't know what the voltage levels are though, sorry ...
Julian