Important: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

The liftgate module uses an optical sensor to monitor the liftgate position at all times. The optical sensor requires a 5-volt reference circuit and a return circuit from the liftgate module. There are also 2 signal circuits from the liftgate module to the optical sensor. The optical sensor sends pulses through both signal circuits to the liftgate module whenever the liftgate is in motion. The optical sensor pulses allow the liftgate module to calculate the liftgate position at all times. The optical sensor signal circuits switch from 0.01-0.45 volt as the liftgate is moving.

Liftgate operation is requested.

The liftgate module does not detect optical sensor pulses when liftgate is in motion.

Liftgate operation is suspended.

The liftgate module detects optical sensor pulses or a scan tool is used to clear the DTC.

Inspect the optical sensor for proper and secure installation in relation to the liftgate motor.

Schematic Reference

Body Rear End Schematics

Connector End View Reference

Body Rear End Connector End Views

Electrical Information Reference

Scan Tool Reference

1. Attempt to open the liftgate. The liftgate should smoothly open.
2. Attempt to close the liftgate. The liftgate should smoothly close.

1. Ignition ON, disconnect the liftgate module harness connector C3.
2. Verify a voltage value of between 4.5-5.5 volts is present between the reference voltage terminal 8 and low reference terminal 11 at the liftgate module.

⇒	If voltage does not equal 4.5-5.5 volts, replace the liftgate module.

3. Verify continuity is present between the reference voltage terminal 8 and the low reference terminal 11 at the liftgate module harness connector.

⇒	If no continuity is found, inspect both the reference voltage circuit and low reference circuit for an open. If all circuits test normal, replace the liftgate motor assembly.

4. Verify no continuity is present between the reference voltage terminal 8 and ground.

⇒	If continuity is found, inspect the reference voltage circuit for a short to ground. If the circuit tests normal, replace the liftgate motor assembly.

5. Verify continuity is present between the reference voltage terminal 8 and the sensor 1 signal terminal 9 at the liftgate module harness connector.

⇒	If no continuity is found, inspect sensor 1 signal circuit for an open. If all circuits test normal, replace the liftgate motor assembly.

6. Verify no continuity is present between the sensor 1 signal terminal 9 and ground.

⇒	If continuity is found, inspect the sensor 1 signal circuit for a short to ground. If the circuit tests normal, replace the liftgate motor assembly.

7. Verify continuity is present between the reference voltage terminal 8 and the sensor 2 signal terminal 10 at the liftgate module harness connector.

⇒	If no continuity is found, inspect sensor 2 signal circuit for an open. If all circuits test normal, replace the liftgate motor assembly.

8. Verify no continuity is present between the sensor 2 signal terminal 10 and ground.

⇒	If continuity is found, inspect the sensor 2 signal circuit for a short to ground. If the circuit tests normal, replace the liftgate motor assembly.

9. If all circuits test normal, test or replace the liftgate module.

Important: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for liftgate module replacement, setup and programming