Hood Ajar Indicator/Message Malfunction

Hood Ajar Indicator/Message Malfunction

Diagnostic Instructions

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

Diagnostic Fault Information





Circuit/System Description

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

Reference Information
Schematic Reference

* Immobilizer Schematics (Immobilizer Schematics)
* Remote Function Schematics (Electrical Diagrams)
* Theft Deterrent System Schematics (Theft Deterrent System Schematics)

Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Keyless Entry System Description and Operation (without ATH) (Keyless Entry System Description and Operation (Without ATH))Keyless Entry System Description and Operation (with ATH) (Keyless Entry System Description and Operation (With ATH))
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing For Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

Ignition ON, observe the scan tool BCM Hood Position parameter. With the hood open, the Hood Position parameter should read open. With the hood closed, the Hood Position 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 8 ohm 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 B 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 B55 Hood Ajar Switch.

4. If all circuits test normal, test or replace the K9 Body Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Hood Primary and Secondary Latch Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for BCM replacement, setup and programming