Hood

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B3006

Hood Ajar Circuit

For symptom byte information, refer to Symptom Byte List.

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) applies B+ to the hood ajar signal circuit and monitors the voltage to determine the position of the hood. When the hood is closed, the switch is open and voltage remains high. When the hood is open, the switch is closed and the voltage is pulled low.

Conditions for Running the DTC

The BCM continuously monitors for this DTC

Conditions for Setting the DTC

B3006 01

The BCM detects that the hood ajar switch signal circuit is shorted to battery.

B3006 02

The BCM detects that the hood ajar switch signal circuit is shorted to ground.

B3006 04

The BCM detects that the hood ajar switch signal circuit is open.

Action Taken When the DTC Sets

• The hood ajar switch input will be ignored as a content theft deterrent trigger.
• Remote vehicle start (if equipped) will be disabled.

Conditions for Clearing the DTC

• A current DTC will clear when the conditions for setting the DTC are no longer present.
• A history DTC will clear after 40 malfunction free ignition cycles.

Reference Information

Schematic Reference

Immobilizer Schematics

Connector End View Reference

Master Electrical Component List

Description and Operation

Keyless Entry System Description and Operation

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON.
2. Verify the scan tool Hood Ajar Switch parameter is Open when the hood is open and Closed when the hood is closed.


• If the parameter does not change
  Refer to Circuit/System Testing.



• If the parameter changes


3. All OK.

Circuit/System Testing

1. Ignition 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.
2. 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


3. Ignition ON.
4. Test for greater than 10 V between the signal circuit terminal B and ground.


• If 10 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 10 V


5. Ignition OFF, disconnect the X4 and X7 harness connector at the K9 Body Control Module, ignition ON.
6. 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


7. Test or replace the B55 Hood Ajar Switch.

Component Testing

1. Ignition OFF, disconnect the harness connector at the B55 Hood Ajar Switch.
2. Test for 2738–3350 Ω between the signal terminal A and the signal terminal B with the hood latch in the closed position.


• If not between 2738–3350 Ω
  Replace the B55 Hood Ajar Switch.



• If between 2738–3350 Ω


3. Test for 658–806 Ω between the signal terminal A and the ground terminal C with the hood latch in the closed position.


• If not between 658–806 Ω
  Replace the B55 Hood Ajar Switch.



• If between 658–806 Ω


4. Test for 2080–2545 Ω between the signal terminal B and the ground terminal C with the hood latch in the closed position.


• If not between 2080–2545 Ω
  Replace the B55 Hood Ajar Switch.



• If between 2080–2545 Ω


5. Test for 2738–3350 Ω between the signal terminal A and the signal terminal B with the hood latch in the open position.


• If not between 2738–3350 Ω
  Replace the B55 Hood Ajar Switch.



• If between 2738–3350 Ω


6. Test for 2080–2545 Ω between the signal terminal A and the ground terminal C with the hood latch in the open position.


• If not between 2080–2545 Ω
  Replace the B55 Hood Ajar Switch.



• If between 2080–2545 Ω


7. Test for 658–806 Ω between the signal terminal B and the ground terminal C with the hood latch in the open position.


• If not between 658–806 Ω
  Replace the B55 Hood Ajar Switch.



• If between 658–806 Ω


8. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Hood Primary and Secondary Latch Replacement
• Control Module References for body control module replacement, programming, and setup.