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

The liftgate object sensor uses two tape switches embedded in the liftgate opening weatherstrip to detect any foreign objects in the path of the liftgate. When pressure is applied to the weatherstrip, the tape switch is closed signaling the liftgate module than an object is in the path of the liftgate. The liftgate module will reverse the direction of the liftgate motor should this occur.

The 2 tape switches are placed in series between the liftgate object sensor signal circuit and the liftgate object low reference circuit. Each object sensor has a resistor as well as the switch. The resistors enable the liftgate module to perform diagnostic functions on the circuits. When both switches are open, voltage supplied by the liftgate module passes through the resistors and gives the module a reference voltage. If an object were to be in the path of a moving liftgate, the affected switch would close. The closing of the switch would bypass the resistor and change the reference voltage seen by the liftgate module , indicating that one of the switches is closed and an object has been detected.

A power liftgate operation is requested.

The voltage seen at the liftgate module does not equal the expected value.

Liftgate operation is suspended until the conditions for setting are no longer present. If the liftgate is in motion prior to the DTC setting, it will reverse and liftgate operation will be suspended.

The conditions for setting the DTC are no longer present or a scan tool is used to clear the DTC.

Schematic Reference

Body Rear End Schematics

Connector End View Reference

Body Rear End Connector End Views

Electrical Information Reference

Scan Tool Reference

While the liftgate is closing, individually depress either object sensor. The liftgate should stop and reverse direction after pressing the sensor.

1. Ignition OFF, disconnect the harness connectors at the left and right object sensors.
2. Ignition OFF, test for less than 1 ohm of resistance between the low reference circuit and ground at the left object sensor.

⇒	If greater than 1 ohm, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the liftgate module.

3. Ignition ON, test for 5 volts between the signal circuit and ground at the right object sensor.

⇒	If less than 5 volts, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the liftgate module.

4. Disconnect the liftgate module harness connector.
5. Test for 0 volts between the signal circuit and ground.

⇒	If greater than 0 volts, test the signal circuit for a short to voltage.

6. Test or replace the affected object sensor.

1. Ignition OFF, disconnect the harness connector at the right object sensor.
2. Test for 10K ohms of resistance between the signal terminal and the low reference terminal.

⇒	If resistance is not within the specified range, replace the right object sensor.

3. Disconnect the harness connector at the left object sensor.
4. Test for approximately 10K ohms of resistance between the signal terminal and the low reference terminal.

⇒	If resistance is not within the specified range, replace the left object sensor.

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