Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

The body control module (BCM) monitors the voltage input of the hood ajar switch signal circuit to determine whether the hood is closed or ajar. The hood ajar switch is a normally open switch that closes when the hood is open. With the hood closed (switch open), the BCM monitors voltage through two resistors in the hood ajar switch in series. With the hood ajar (switch closed), the BCM monitors voltage through the resistors in parallel.

Schematic Reference

Starting and Charging Schematics

Connector End View Reference

Engine Electrical Connector End Views

Description and Operation

Keyless Entry System Description and Operation

Electrical Information Reference

Ignition ON, observe the scan tool 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 hood ajar switch.
2. Ignition OFF, test for less than 1.0 ohm of resistance between the ground circuit terminal B and ground.

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

3. Ignition ON, test for B+ between the signal circuit terminal A and ground.

⇒	If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.

4. If all circuits test normal, test or replace the hood ajar switch.

Hood Ajar Switch

1. Ignition OFF, disconnect the harness connector at the hood ajar switch.
2. With the switch in the open position, test for 6,500-7,250 ohms of resistance between the signal terminal A and the ground terminal B.

⇒	If not within the specified range, replace the hood ajar switch.

3. With the switch in the closed position, test for 650-675 ohms of resistance between the signal terminal A and the ground terminal B.

⇒	If not within the specified range, replace the hood ajar switch.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.