Standard Procedure - Power Liftgate Learn/Relearn Procedure

The Power LiftGate Module (PLGM) uses adaptive memory that allows the power liftgate system to learn and adapt to the many variables (travel limits, resistance to travel, etc.) that may be required to operate the liftgate. After 8 miles have been recorded on the vehicle odometer (in-plant mode), anytime the liftgate is fully opened and fully closed using the power liftgate system, the PLGM will learn or relearn from that cycle. If a replacement power liftgate system component is installed or a mechanical liftgate adjustment is made, the PLGM can relearn the effort and time required to open or close the liftgate. This learn/relearn cycle can be initiated using the power liftgate switches, using the Remote Keyless Entry (RKE) FOB with Integrated Key (FOBIK) or with a diagnostic scan tool connected to the Data Link Connector (DLC).

To perform a power liftgate learn/relearn cycle, do the following:

1. Connect a diagnostic scan tool to the DLC and check for any power liftgate system active or stored Diagnostic Trouble Codes (DTC). Correct and erase any active or stored DTC.
2. Close the liftgate.
3. Using the scan tool, select the Power LiftGate Module (PLGM)  menu item. Then select, Misc Functions  and select the Calibrate Liftgate  routine.
4. After the Calibrate Liftgate  routine completes, use the scan tool to check the Routine Status  for a Pass  or Fail  message. If the Routine Status  is Fail  , the scan tool will display the reason for the failure to aid in further system diagnosis and in rerunning the Calibrate Liftgate  routine.
5. Follow the instructions displayed in the scan tool to complete the test.
6. Use any switch or RKE FOBIK to be certain the liftgate can be powered open and closed successfully.
7. The liftgate learn cycle is now complete.

In order to obtain conclusive testing of the power liftgate system, the Controller Area Network (CAN) data bus and all of the electronic modules that provide inputs to, or receive outputs from the PLGM, as well as all of the power liftgate system components must be checked. Any diagnosis of the power liftgate system should begin with the use of a diagnostic scan tool and the appropriate diagnostic procedures.