B2495

DTC B2495

Diagnostic Instructions

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

DTC Descriptors
DTC B2495 01
- Liftgate Latch Control Circuit Short to Battery

DTC B2495 02
- Liftgate Latch Control Circuit Short to Ground

DTC B2495 04
- Liftgate Latch Control Circuit Open

Diagnostic Fault Information






Circuit/System Description

The power liftgate latch assembly contains a cinch/release motor as well as 3 sector switches that provide inputs to the liftgate module (LGM) with regards to the position of the liftgate during opening and closing. When the sector switches determine that liftgate is fully latched, the LGM applies voltage and ground to the cinch/release motor to close and secure the liftgate.

The liftgate latch is also used to release the liftgate. When the LGM receives a request to release the liftgate, the LGM will respond by applying voltage and ground to the cinch/release motor by reversing the polarity. This releases the cinch/release motor, releasing the liftgate and allowing the liftgate motor to begin opening the assembly. For more detailed information concerning power liftgate operation refer to Liftgate Description and Operation.

Conditions for Running the DTC

Battery voltage must be between 9-16 volts.

Conditions for Setting the DTC

* DTC B2495 01 will set when the LGM detects a short to voltage in the liftgate latch motor open control circuit or the liftgate latch motor close control circuit.
* DTC B2495 02 will set when the LGM detects a short to ground in the liftgate latch motor open control circuit or the liftgate latch motor close control circuit.
* DTC B2495 04 will set when the LGM detects an open/high resistance in the liftgate latch motor open control circuit or the liftgate latch motor close control circuit.

Actions Taken When the DTC Sets

* If the liftgate is in motion when the DTC sets, liftgate operation will be disabled and resort to manual operation.
* If the liftgate is not in motion when the DTC sets, all liftgate functions will be disabled.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.
* You issue a scan tool CLEAR DTCs command.

Diagnostic Aids

Whenever the LGM is disconnected or loses power, the ignition must be cycled OFF then ON.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connectors at the liftgate latch assembly.
2. Ignition OFF, test for less than 1 ohm of resistance 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 the circuit tests normal, replace the LGM.

3. Ignition OFF, test for less than 1 ohm of resistance 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 the circuit tests normal, replace the LGM.

4. Disconnect the C2 harness connector at the LGM.
5. Verify that a test lamp does not illuminate between B+ and liftgate latch motor open control circuit terminal 1.

• If the test lamp illuminates, test the control circuit for a short to ground.

6. Verify that a test lamp does not illuminate between B+ and liftgate latch motor close control circuit terminal 2.

• If the test lamp illuminates, test the control circuit for a short to ground.

7. If all circuits test normal, test or replace the liftgate latch assembly.

Repair Instructions

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

* Liftgate Close Actuator Motor Control Module Replacement
* Control Module References for LGM replacement, setup, and programming. Programming and Relearning