锟斤拷 If not the specified value, replace the liftgate close switch.
3. Test for less than 2 ohms between the signal terminal D and the low reference terminal A with the switch in the closed position.
锟斤拷 If greater than the specified range, replace the liftgate close switch.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Liftgate Release Switch Replacement (Except Avalanche and Escalade EXT) (See: Body and Frame/Doors, Hood and Trunk/Trunk /
Liftgate/Trunk / Liftgate Switch/Service and Repair/Liftgate Release Switch Replacement (Except Avalanche and Escalade EXT))
* Control Module References (See: Testing and Inspection/Programming and Relearning) for liftgate control module replacement,
programming and setup
Manual Liftgate
DTC B2494 (Manual Liftgate)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC B2494 00
- Liftgate Handle Switch Circuit
Diagnostic Fault Information
Circuit/System Description
The liftgate release switch is an input to the body control module (BCM). The BCM monitors the signal circuit and when the release switch is
activated the signal circuit voltage goes low. The BCM controls the liftgate release actuator through the liftgate latch release relay. When the release
switch signal is activated, the BCM enables the liftgate latch release relay by applying battery voltage to the liftgate latch release relay supply circuit
and the relay is energized when the BCM grounds the liftgate latch release relay control circuit. When the relay is energized battery voltage is
supplied to the liftgate release actuator through the liftgate release actuator control circuit.
Conditions for Running the DTC
The system voltage is 9-16 volts.
Conditions for Setting the DTC
The liftgate release switch signal circuit is active for longer than 10 minutes.
Action Taken When the DTC Sets
The liftgate latch will be inoperative from the liftgate handle switch.
Conditions for Clearing the DTC
