B2494
DTC B2494
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 B2494 02
- Power Liftgate Handle Switch Circuit Short to Ground
Diagnostic Fault Information
Circuit/System Description
The power liftgate handle switch circuit provides a single input to the liftgate module (LGM). The liftgate handle switch is supplied a signal voltage, when the switch contact closes, the LGM detects the voltage drop and commands the liftgate to open.
Conditions for Running the DTC
The system voltage is 9-16 volts.
Conditions for Setting the DTC
The Liftgate Open Signal circuit is active for greater than 10 minutes.
Action Taken When the DTC Sets
The liftgate will be inoperative in the power mode and the manual mode.
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 be a history DTC.
* A history DTC will clear after 50 ignition cycles.
Diagnostic Aids
Note: Before testing can be performed, the liftgate must be opened. Refer to Opening the Liftgate Without Electrical Power (Procedures) for the appropriate procedure.
Whenever the LGM loses power or is disconnected, the ignition must be cycled OFF then ON in order to reactivate the LGM.
Reference Information
Schematic Reference
Liftgate Schematics (Liftgate Schematics)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Liftgate Description and Operation (Liftgate Description and Operation)
Electrical Information Reference
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Circuit Testing (Circuit Testing)
* Wiring Repairs (Wiring Repairs)
* Connector Repairs (Connector Repairs)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
Ignition ON, observe the scan tool Liftgate Handle Switch parameter while pressing and releasing the liftgate handle switch. The parameter should change between Active and Inactive.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connectors at the liftgate handle switch.
2. Ignition ON, verify the scan tool Liftgate Handle Switch parameter is Inactive.
• If not the specified value, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the LGM.
3. Connect a 3A fused jumper wire between the signal circuit terminal 1 and ground, verify the scan tool Liftgate Handle Switch 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 LGM.
4. If all circuits test normal, test or replace the liftgate handle switch.
Component Testing
1. Ignition OFF, disconnect the harness connector at the liftgate handle switch.
2. Test for infinite resistance between the signal terminal 1 and the low reference terminal 2 with the switch in the open position.
• If not the specified value, replace the liftgate handle switch.
3. Test for less than 2.0 ohms between the signal terminal 1 and the low reference terminal 2 with the switch in the closed position.
• If greater than the specified range, replace the liftgate handle switch.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the repair.
* Liftgate Outside Handle Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for LGM replacement, setup and programming