D19 Check Harness Short to Ground

With EM010 and EM012 and EM022 disconnected, measure the insulation resistance between EM012/017 and ground EM010/023.

Is the resistance > 10 Mohms?

Yes
GO to D20, D20: Check Harness Short Core to Core

No
Inspect harness/connector EM012, EM022 for corrosion, bent/pushed back pins.
Repair as required and reconnect plug(s).
GO to D21, D21: End