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 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 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 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 liftgate module 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 V.

Conditions for Setting the DTC

B2495 01

The liftgate module detects a short to voltage in the liftgate latch motor cinch control circuit or the liftgate latch motor release control circuit.

B2495 02

The liftgate module detects a short to ground in the liftgate latch motor cinch control circuit or the liftgate latch motor release control circuit.

B2495 04

The liftgate module detects an open/high resistance in the liftgate latch motor cinch control circuit or the liftgate latch motor release 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

DTC B2495 01 may set as current or history when the liftgate module detects erratic voltage levels in the electrical system and does not affect the operation of the power liftgate. If this DTC is set and the liftgate functions normally, clear the DTC.

Note: Before testing can be performed on an inoperative liftgate, the liftgate must be opened. Refer to Opening the Liftgate Without Electrical Power (Procedures) for the appropriate procedure.

Whenever the liftgate module loses power or is disconnected, the ignition must be cycled OFF then ON in order to reactivate the liftgate module.

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, doors UNLOCKED, open the liftgate by pressing the S46 liftgate handle switch, the liftgate latch should release the liftgate allowing the liftgate to be pulled open.

Circuit/System Testing

1. Ignition OFF, disconnect the X1 harness connector at the K39 liftgate module.
2. Test for less than 15 ohm between the control circuit terminal 1 and the control circuit terminal 2.

• If greater than the specified range, test either control circuit for a short to voltage or an open/high resistance. If circuits test normal, test or replace the A23C liftgate latch assembly.

3. Install a 30 A fused jumper wire between one of the control circuit terminals and 12 V. Momentarily install a jumper wire between the other control circuit terminal and ground. Reverse the jumper wires at least two times, the M31 liftgate latch assembly should perform the CINCH and RELEASE functions

• If it does not perform as specified, test either control circuit for a short to ground. If the circuits test normal, replace the A23C liftgate latch assembly.

4. If all circuits test normal, replace the K39 liftgate module.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the repair.

* Liftgate Latch Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for liftgate module replacement, setup and programming