A12: Check Harness Short Core to Core

With connectors EM015 and PI007 to PI014 disconnected & PI main relay removed, measure the insulation resistance, in turn, between pairs:
EM015/004 & EM015/015
EM015/005 & EM015/016
EM015/006 & EM015/017
EM015/007 & EM015/018

Is the resistance > 10M ohms?

Yes
Go to A13 A13: End

No
Repair the harness/connector (PI001/037, 036, 034, 030) and test the system for normal operation.