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DTC B2494

Diagnostic Instructions

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

DTC Descriptor

DTC B2494 02: Liftgate Handle Switch Circuit Short to Ground

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Liftgate Release Switch Signal

B2494 02

1

1

--

Tailgate Release Switch Ground

--

1

--

--

1. Liftgate Release Switch Malfunction

Circuit/System Description

The tailgate release switch is an input to the BCM. The BCM monitors the signal circuit and when the release switch is activated the signal circuit voltage goes low. The BCM controls the tailgate release actuator through the tailgate latch release relay. When the release switch signal is activated, the BCM enables the tailgate latch release relay by applying battery voltage to the tailgate latch release relay supply circuit and the relay is energised when the BCM grounds the tailgate latch release relay control circuit. When the relay is energised battery voltage is supplied to the tailgate release actuator through the tailgate release actuator control circuit.

Conditions for Running the DTC

The system voltage is 9-16 volts.

Conditions for Setting the DTC

The tailgate release switch signal circuit is active for greater than 10 minutes.

Action Taken When the DTC Sets

The BCM will ignore the signal input from the tailgate 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

Diagnostic Aids

Before testing can be performed the liftgate must be opened.

Reference Information

Schematic Reference

Liftgate Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Rear Hatch/Gate Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, observe the scan tool Int. Boot/Liftglass Sw. parameter while pressing and releasing the tailgate release switch. The parameter should change between Active and Inactive.

Circuit/System Testing

  1. Ignition OFF, disconnect the wiring harness plug at the tailgate release switch.
  2. Ignition ON, verify the scan tool Int. Boot/Liftglass Sw. parameter is Inactive.
  3. If not the specified parameter, test the signal circuit terminal 2 for a short to ground. If the circuit tests normal, replace the BCM.
  4. Install a 3A fused jumper wire between the signal circuit terminal 2 and the ground circuit terminal 1. Verify the scan tool Int. Boot/Liftglass Sw. parameter is Active.
  5. If not the specified parameter, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  6. If all circuits test normal, test or replace the tailgate release switch.

Component Testing

  1. Ignition OFF, disconnect the wiring harness plug at the tailgate release switch.
  2. Test for infinite resistance between the signal terminal 2 and the ground terminal 1 with the switch in the open position.
  3. If not the specified value, replace the tailgate release switch.
  4. Test for less than 2 Ω between the signal terminal 2 and the ground terminal 1 with the switch in the closed position.
  5. If greater than the specified range, replace the tailgate release switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Tailgate Outside Handle Replacement
    • Control Module References for BCM replacement, setup and programming
   


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