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 Descriptors

DTC B3006 02: Hood Ajar Circuit Short to Ground
DTC B3006 05: Hood Ajar Circuit Short to Battery or Open

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Hood Ajar Switch Signal | B3006 02 | B3006 05 | B3006 05 | --
Hood Closed Switch Signal | B3006 02 | B3006 05 | B3006 05 | --
Ground | -- | B3006 05 | -- | --

### Circuit/System Description

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, grounding the hood closed switch signal circuit from the BCM, and the hood ajar portion of the switch is open. During proper operation, the two separate voltage signals at the BCM should never be at the same voltage.

### Conditions for Running the DTC

The BCM continuously monitors for this DTC

### Conditions for Setting the DTC

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

### Action Taken When the DTC Sets

• | Remote start functions will be disabled.

• | The hood ajar switch inputs will be ignored by content theft deterrent (CTD).

### 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

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 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.

### Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the hood ajar switch.
2. Ignition OFF, test for less than 5 ohms 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, verify the scan tool Hood Ajar Sw. Signal 1 parameter is greater than 11 volts.

⇒ | If less than the specified range, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the BCM.

4. Verify the scan tool Hood Ajar Sw. Signal 2 parameter is greater than 11 volts.

⇒ | If less than the specified range, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the BCM.

5. Install a 3A fused jumper wire between the signal circuit terminal A and the ground circuit terminal C. Verify the scan tool Hood Ajar Sw. Signal 1 parameter is less than 1 volt.

⇒ | If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.

6. Install a 3A fused jumper wire between the signal circuit terminal B and the ground circuit terminal C. Verify the scan tool Hood Ajar Sw. Signal 2 parameter is less than 1 volt.

⇒ | If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.

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

### Component Testing

#### 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 infinite, replace the hood ajar switch.

3. Test for less than 2.0 ohms 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 infinite, replace the hood ajar switch.

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

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

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Hood Primary and Secondary Latch Replacement

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