Circuit/System Testing

Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the B55 Hood Ajar Switch. It may take up to 2 min 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. Vehicle 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.
- Go to next step: If less than 10 Ω
Vehicle in Service Mode.
Test for B+ between the signal circuit terminal B and ground.
- If less than B+
1. Vehicle OFF, disconnect the harness connector at the K9 Body Control Module.
2. Test for infinite resistance between the B+ circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - Go to next step: If Infinite resistance.
3. Test for less than 2 Ω in the B+ 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.
- Go to next step: If B+
Vehicle OFF, disconnect the X4 and X7 harness connector at the K9 Body Control Module. Vehicle in Service Mode.
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.
- Go to next step: If less than 1 V
Test or replace the B55 Hood Ajar Switch.