B2495
DTC B2495
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 Instructionsprovides an overview of each diagnostic category.
DTC Descriptors
DTC B2495 01
- Endgate/Liftgate Latch Control Circuit Short to Battery
DTC B2495 02
- Endgate/Liftgate Latch Control Circuit Short to Ground
DTC B2495 04
- Endgate/Liftgate Latch Control Circuit Open Circuit
Diagnostic Fault Information
Circuit/System Description
The latch motor is a bi-directional motor and cinch or unlatch operation is the result of the direction of the motor rotation. The liftgate module (LGM) controls the latch motor through the control circuits by supplying power and ground in the appropriate polarity. The motor control circuits are monitored by the LGM prior to activation for a high or low condition and during motor operation for an insufficient current flow condition.
Conditions for Running the DTC
The system voltage is 9-16 volts.
Conditions for Setting the DTC
B2495 01
The LGM detects a short to voltage in the liftgate latch motor open control circuit or the liftgate latch motor close control circuit.
B2495 02
The LGM detects a short to ground in the liftgate latch motor open control circuit or the liftgate latch motor close control circuit.
B2495 04
The LGM detects an open/high resistance in the liftgate latch motor open control circuit or the liftgate latch motor close control circuit.
Action Taken When the DTC Sets
The liftgate will be inoperative in the power and manual modes
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
Important: 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 End Views By Name
Description and Operation
Liftgate 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 Programming and Relearningfor scan tool information
Circuit/System Verification
Ignition ON, command the liftgate to OPEN and CLOSE with the scan tool. The liftgate latch assembly should release the liftgate allowing the liftgate to open.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the liftgate latch assembly.
2. Test for less than 5 ohms between the control circuit terminal 1 and ground.
• If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuits test normal, replace the LGM.
3. Test for less than 5 ohms between the control circuit terminal 3 and ground.
• If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuits test normal, replace the LGM.
4. Connect a test lamp between control circuit terminal 1 and ground.
5. Ignition ON, command the liftgate to OPEN by pressing and releasing the liftgate interior switch. The test lamp should illuminate while commanding the OPEN state.
• If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the LGM.
• If the test lamp is always ON, test the control circuit for a short to voltage, if the circuit tests normal, replace the LGM.
6. Ignition OFF, connect a test lamp between the control circuit terminal 3 and ground.
7. Connect a 3A fused jumper wire between the signal circuit terminal 6 and ground.
8. Ignition ON, command the liftgate to CLOSE by pressing and releasing the liftgate interior switch. The test lamp should illuminate while commanding the CLOSE state.
• If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the LGM.
• If the test lamp is always ON, test the control circuit for a short to voltage, if the circuit tests normal, replace the LGM.
9. If all circuits test normal, test or replace the liftgate latch assembly.
Component Testing
1. Install a 20A fused jumper wire between the control terminal 1 and 12 volts. Momentarily install a jumper wire between the control terminal 3 and ground. The liftgate latch assembly should perform the CINCH or RELEASE function.
• If the function does not perform as specified, replace the liftgate latch assembly.
2. Reverse the jumper wires; the liftgate latch assembly should perform the RELEASE or CINCH function.
• If the function does not perform as specified, replace the liftgate latch assembly.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
Control Module References Programming and Relearningfor LGM replacement, setup and programming