Mini 2009 Diesel NON Starter

Hello peeps am trying to sort out a non start issue with a 09 Mini Diesel. Basically the lady who owns it drove to her hairdressers, came out afterwards and her car wont start

Permanent Faults are 4691 Supply voltage 3 ECM short to ground .
Can someone please help with a wiring diagram or which Pins to check for power/ earth etc.

Regards Paul