Update
Just to update,
Sent the ICM to Lukasz at Volvodiagnostic. Not the ICM so I've ordered a MOST loop cable from Amazon (£10 for female loop cable).
Lukasz suggested this to fault test the various modules one by one as the ICM is working fine.
He also had a YouTube link you can find called 'MOST Ring break test' there are two parts. Brief but useful.
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