The liftgate switch is an input to the body control module (BCM). The BCM supplies battery voltage to the signal circuit and when the liftgate switch is activated the signal circuit voltage goes low. The BCM controls the liftgate latch assembly through the liftgate RLYS relay. When the liftgate switch signal is activated, the BCM enables the RLYS relay by applying battery voltage to the liftgate relay circuit and the relay is energized when the BCM grounds the RLYS relay control circuit. When the relay is energized battery voltage is supplied to the liftgate latch assembly through the liftgate latch control circuit.

Before testing can be performed, the liftgate must be opened. Refer to Opening the Liftgate Without Electrical Power for the appropriate procedure.

Schematic Reference

Release Systems 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

Unlock all doors using the driver door lock switch. Command the liftgate release by pressing the liftgate release switch. The liftgate latch assembly should release the liftgate.

1. Ignition OFF, disconnect the harness connector at the liftgate release switch.
2. Test for less than 1 ohm between the ground circuit terminal A and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

3. Test for infinite resistance between the signal terminal B and the ground terminal A with the switch in the open position.

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

4. Test for less than 2 ohms between the signal terminal B and the ground terminal A with the switch in the closed position.

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

5. Test for greater than 10 volts between the signal circuit terminal B and ground.

⇒	If less than the specified range, test the signal circuit for a short to ground or and open/high resistance. If the circuit tests normal, replace the BCM.

6. Ignition OFF, connect the harness connector at the liftgate release switch and disconnect the harness connector at the liftgate latch.
7. Test for less than 1 ohm between the ground circuit terminal 3 and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

8. Connect the harness connector at the liftgate latch and disconnect the X1 harness connector at the I/P fuse block.
9. Verify that a test lamp does not illuminate between the control circuit terminal 23 and ground.

⇒	If the test lamp illuminates, test the control circuit for a short to voltage.

10. Connect a 50A fused jumper wire between the control circuit terminal 22 and B+. Verify that the liftgate latch activates.

⇒	If the liftgate latch does not activate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the liftgate latch.

11. Ignition OFF, connect the X1 harness connector at the I/P fuse block and disconnect the X4 and X7 harness connectors at the BCM.
12. Connect a 10A fused jumper wire between the control circuit terminal 13 and B+. Verify the liftgate latch does not activate

⇒	If the liftgate latch activates, test the control circuit terminal 22 for a short to ground. If the circuit tests normal replace the I/P fuse block.

⇒	If the jumper wire fuse opens, test the control circuit terminal 13 for a short to ground. If the circuit tests normal replace the I/P fuse block.

13. Briefly connect another jumper wire between the control circuit terminal 22 and ground. Verify the liftgate latch activates.

⇒	If the liftgate latch does not activate, test the control circuit for an open/high resistance. If the circuit tests normal replace the I/P fuse block.

14. If all circuits test normal, replace the BCM.

Liftgate Latch Assembly

1. Ignition OFF, disconnect the harness connector at the liftgate latch assembly.
2. Install a 20-amp fused jumper wire between the control terminal 1 and 12 volts. Install a jumper wire between the ground terminal 3 and ground. Verify the liftgate latch actuator activates.

⇒	If the actuator does not perform as specified, replace the liftgate latch assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.