H20: Check Harness Short Core to Core

Measure the insulation resistance between EM012/016 & EM012/022

Is the resistance> 10M ohms?

Yes
Reconnect all plugs
Go to H21

No
Inspect EM012, EM015 & EM024 for corrosion, bent / pushed back pins or locate & repair the harness / connector fault, remake all connections
Go to H21