The body control module (BCM) monitors the voltage input of the hood ajar switch signal circuit.

Schematic Reference

Connector End View Reference

Component Connector End Views

Description and Operation

Keyless Entry System Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, observe the scan tool BCM Hood Ajar Switch parameter. With the hood open, the Hood Ajar Switch parameter should read OPEN. With the hood closed, the Hood Ajar Switch parameter should read CLOSED.

1. Ignition OFF, disconnect the harness connector at the B55 Hood Ajar Switch.
2. Ignition OFF, test for less than 5 Ω between the ground circuit terminal C and ground.

⇒	If greater than the specified range, test the ground circuit for an open / high resistance.

3. Ignition ON, test for greater 11 V between the signal circuit terminal A and ground.

⇒	If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K9 Body Control Module (BCM).

⇒	If less than the specified range, test the signal circuit for a short to ground or an open / high resistance. If the circuit tests normal, replace the K9 Body Control Module (BCM).

4. If all circuits test normal, test or replace the B55 Hood Ajar Switch.

Static Test

1. Ignition OFF, disconnect the harness connector at the B55 Hood Ajar Switch.
2. With the B55 Hood Ajar Switch open position, test for infinite resistance between the ground terminal C and the signal terminal A.

⇒	If not infinite, replace the B55 Hood Ajar Switch.

3. With the B55 Hood Ajar Switch closed position, test for less than 2 Ω between the ground terminal C and the signal terminal A

⇒	If not infinite, replace the B55 Hood Ajar Switch.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.