Captiva

DTC B2494

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.

The system voltage is 9-16 volts.

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

The BCM will ignore the signal input from the tailgate release switch.

Before testing can be performed the liftgate must be opened.

Schematic Reference

Liftgate Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Rear Hatch/Gate Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

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.

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.

⇒	If not the specified parameter, test the signal circuit terminal 2 for a short to ground. If the circuit tests normal, replace the BCM.

3. 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.

⇒	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.

4. If all circuits test normal, test or replace the tailgate release switch.

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.

⇒	If not the specified value, replace the tailgate release switch.

3. Test for less than 2 Ω between the signal terminal 2 and the ground terminal 1 with the switch in the closed position.

⇒	If greater than the specified range, replace the tailgate release switch.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.