A12: Check Circuit Continuity

With BT009 disconnected and relay 4 removed, measure the resistance between BT009/002 and relay socket pin 5

- Is the resistance < 0.5 ohms?
Yes
GO to A13 A13: Check Harness Short to Ground
No
Inspect harness/connector BT009, fuse holder F7 and BT011/001 for corrosion, damage, bent or pushed back pins. Repair as required and test the system for normal operation.