D3: Check Harness Core-Core Insulation

Measure the insulation resistance between EM013/018 & EM013/017

Is the resistance > 10M Ohms?

Yes
Go to D4

No
Inspect connectors EM013, PI026 & PI027 for corrosion, damaged or pushed back pins or repair the harness/connector PI001/017, PI001/018, PI001/019, PI001/020 & test the system for normal operation.