B2730

DTC B2730

Diagnostic Instructions

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



DTC Descriptor
DTC B2730 00
- Interior Trunk/Liftglass/Hatch Release Switch Circuit




Diagnostic Fault Information






Circuit/System Description

When the ignition is ON, the body control module (BCM) supplies a signal to the rear compartment lid release switch through the trunk release switch signal circuit. When the rear compartment lid release switch is pressed, the voltage within the signal circuit is pulled low and in response, the BCM applies ground to the trunk release relay control circuit, which energizes the coil side of the trunk relay. The switch side of the trunk relay then closes, supplying battery positive voltage through the relay and the latch motor voltage control circuit to the rear compartment lid latch. The rear compartment lid latch, then releases the rear compartment lid so that it may be manually raised to an open position.


Conditions for Running the DTC

The system voltage is 9-16 volts.


Conditions for Setting the DTC

* The BCM detects a short to ground in the trunk release switch signal circuit for greater than 10 minutes.
* The rear compartment lid release switch is closed for greater than 10 minutes.



Action Taken When the DTC Sets

The rear compartment lid release switch will be inoperative.


Conditions for Clearing the DTC

* The DTC will be current for as long as the fault is present.
* When the fault is no longer present, the DTC will become a history DTC.
* A history DTC will clear after 50 ignition cycles



Reference Information
Schematic Reference

Release Systems Schematics (Release Systems Schematics)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Luggage Compartment Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

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


Circuit/System Verification

Ignition ON, observe the scan tool Int. Trunk/Liftglass Sw. parameter while pressing the rear compartment lid release switch button. The parameter should change between Active and Inactive.


Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the rear compartment lid release switch.
2. Test for less than 1 ohm between the ground circuit terminal B and ground.

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

3. Ignition ON, verify the scan tool Int. Trunk/Liftglass Sw. parameter is Inactive.

• If not the specified value, test the signal circuit terminal A 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 the ground circuit terminal B. Verify the scan tool Int. Trunk/Liftglass Sw. parameter is Active.

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

5. If all circuits test normal, test or replace the rear compartment lid release switch.



Component Testing

1. Ignition OFF, disconnect the harness connector at the rear compartment lid release switch.
2. Test for infinite resistance between the signal terminal A and the ground terminal B with the switch in the open position.

• If not the specified value, replace the rear compartment lid release switch

3. Test for less than 2 ohms of between the signal terminal A and the ground terminal B with the switch in the closed position.

• If greater than the specified range, replace the rear compartment lid release switch.

4. Test for infinite resistance between each terminal and the lid release switch housing/case.

• If not the specified value, replace the rear compartment lid release switch.




Repair Instructions

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

* Rear Compartment Lid Release Switch Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for BCM replacement, setup and programming