The body control module (BCM) monitors the voltage input of the hood open switch signal circuit and the hood open closed switch signal circuit. With the hood open, the hood ajar portion of the switch is closed, grounding the Hood Ajar Switch Signal circuit from the BCM, and the hood closed portion of the switch is open. With the hood closed, the hood closed portion of the switch is closed, ground the Hood Closed Switch Signal circuit from the BCM, and the hood ajar portion of the switch is open. During proper operation, the 2 separate voltage signals at the BCM should never be at the same voltage with the hood opened or closed.

This DTC shall run when the Run/Crank Relay is enabled.

If both the hood open switch signal circuit and the hood closed switch signal circuit are simultaneously in an active or inactive state.

The DTC will clear when conditions for setting the DTC are no longer present.

Schematic Reference

Immobilizer Schematics

Connector End View Reference

Immobilizer Connector End Views

Description and Operation

Immobilizer Description and Operation

Electrical Information Reference

Scan Tool Reference

Ignition ON, observe the scan tool Hood Open Switch and Hood Closed Switch parameters. With the hood open, the Hood Open Switch parameter should read Active and the Hood Closed Switch parameter should read Inactive. With the hood closed, the Hood Open Switch parameter should read Inactive and the Hood Closed Switch parameter should read Active.

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 C and ground.

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

3. Ignition ON, verify the scan tool BCM Hood Closed Switch and Hood Open Switch parameters are Inactive.

⇒	If not the specified value, test the applicable signal circuit for a short to ground. If the circuit tests normal, replace the BCM.

4. Install a 3A fused jumper wire between the signal circuit terminal A and ground. Verify the scan tool Hood Open Switch parameter is Active.

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

5. Install a 3A fused jumper wire between the signal circuit terminal B and ground. Verify the scan tool Hood Closed Switch parameter is Active.

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

6. 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 hood closed position, test for infinite resistance between the ground terminal C and the signal terminal A.

⇒	If not the specified value, replace the hood ajar switch.

3. Test for less than 2.0 ohms of resistance between the ground terminal C and the signal terminal B.

⇒	If greater than the specified range, replace the hood ajar switch.

4. With the switch in the hood open position, test for infinite resistance between the ground terminal C and the signal terminal B.

⇒	If not the specified value, replace the hood ajar switch.

5. Test for less than 2.0 ohms of resistance between the ground terminal C and the signal terminal A.

⇒	If greater than the specified range, replace the hood ajar switch.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM replacement, setup, and programming