Circuit/System Testing

Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B55 Hood Ajar Switch. It may take up to two minutes for all vehicle systems to power down.
Test for less than 10 Ω between the ground circuit terminal C and ground.
- If 10 Ω or greater
1. Ignition OFF
2. Test for less than 2 Ω in the ground circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, repair the open/high resistance in the ground connection.
- If less than 10 Ω
Ignition ON.
Test for greater than 11.5 V between the signal circuit terminal B and ground.
- If 11.5 V or less
1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
2. Test for infinite resistance between the signal circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If Infinite resistance.
3. Test for less than 2 Ω in the signal circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, replace the K9 Body Control Module.
- If greater than 11.5 V
Ignition OFF, disconnect the X4 and X7 harness connector at the K9 Body Control Module, ignition ON.
Test for less than 1 V between the signal circuit terminal B and ground.
- If 1 V or greater
  Repair the short to voltage on the circuit.
- If less than 1 V
Test or replace the B55 Hood Ajar Switch.