For 1990-2009 cars

### 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 Descriptor

DTC B3006 01: Hood Ajar Circuit Short to Battery
DTC B3006 02: Hood Ajar Circuit Short to Ground
DTC B3006 04: Hood Ajar Circuit Open Circuit

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Hood Ajar Switch Signal | B3006 02 | B3006 04 | B3006 01 | --
Ground | -- | B3006 04 | -- | --

### Circuit/System Description

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

### 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

Prevent an engine start.

### Conditions for Clearing the DTC

• | A current DTC will clear when the conditions for setting are no longer present.

• | A history DTC will clear after 40 malfunction free ignition cycles.

### Reference Information

#### Schematic Reference

• | Immobilizer Schematics

• | Remote Function Schematics

#### Connector End View Reference

Component Connector End Views

#### 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

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.

### Circuit/System Testing

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 less than the specified range, test the signal circuit for a short to ground or 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.

### Component Testing

#### 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 5 Ω between the ground terminal C and the signal terminal A

⇒ | If greater than the specified range, replace the B55 Hood Ajar Switch.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Hood Primary Latch Replacement

• | Control Module References for BCM replacement, programming and setup