B2730
DTC B2730
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.
DTC Descriptor
DTC B2730 00
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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 12 V 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 V.
Conditions for Setting the DTC
* The BCM detects a short to ground in the trunk release switch signal circuit for greater than 60 seconds.
* The rear compartment lid unlatch switch is closed for greater than 60 seconds.
Action Taken When the DTC Sets
The BCM will ignore the signal from the rear compartment lid release switch.
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 Fuel Pump and Level Sensor Assembly
Description and Operation
Luggage Compartment Description and Operation Description and Operation
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 Control Module References 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. The parameter should change between Active and Inactive.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the rear compartment release switch.
2. Test for less than 10 ohms between the ground circuit terminal listed below and ground:
* Ground circuit terminal 2 - S48E multifunction switch-center console (9C3)
* Ground circuit terminal 1 - S58B rear compartment lid unlatch switch-interior (9C1)
• 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 listed below for a short to ground. If the circuit tests normal, replace the K9 body control module.
* Signal circuit terminal 5 - S48E multifunction switch-center console (9C3)
* Signal circuit terminal 3 - S58B rear compartment lid unlatch switch-interior (9C1)
4. Install a 3 A fused jumper wire between the signal circuit terminal listed below and ground. Verify the scan tool Int. Trunk/Liftglass Sw. parameter is Active.
* Signal circuit terminal 5 - S48E multifunction switch-center console (9C3)
* Signal circuit terminal 3 - S58B rear compartment lid unlatch switch-interior (9C1)
• 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 K9 body control module.
5. If all circuits test normal, test or replace the rear compartment release switch.
Component Testing
Interior Rear Compartment Lid Unlatch Switch
1. Ignition OFF, disconnect the harness connector at the S58B rear compartment lid unlatch switch-interior.
2. Test for infinite resistance between the signal terminal 3 and the ground terminal 1 with the switch in the open position.
• If not the specified value, replace the S58B rear compartment lid unlatch switch-interior.
3. Test for less than 2 ohms of between the signal terminal 3 and the ground terminal 1 with the switch in the closed position.
• If greater than the specified range, replace the S58B rear compartment lid unlatch switch-interior.
Center Console Multifunction Switch
1. Ignition OFF, disconnect the harness connector at the S48E multifunction switch-center console.
2. Test for infinite resistance between the signal terminal 5 and the ground terminal 2 with the switch in the open position.
• If not the specified value, replace the S48E multifunction switch-center console.
3. Test for less than 2 ohms of between the signal terminal 5 and the ground terminal 2 with the switch in the closed position.
• If greater than the specified range, replace the S48E multifunction switch-center console.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Accessory Switch Replacement (9C3) Accessory Switch Replacement (9C3)Accessory Switch Replacement (9C1) Accessory Switch Replacement (9C1)
* Control Module References Control Module References for BCM replacement, programming and setup