Inspection and Test - Power Liftgate System
Power Liftgate system is a complex system that consists of several components. To get an accurate test result, the control module of the Power Liftgate must be inspected.
The most trustworthy, effective and accurate method is using GDS required by power liftgate.
GDS helps technicians when inspecting a disabled switch, and enables to check the current status record of the switch of Power Liftgate control module.
The battery must be fully charged before conducting all of the test on power liftgate, and all of the interfering elements of the system must be shown and understood. (refer to the explanation of power liftgate) Refer to the analysis reference table when inspecting and testing the power liftgate.
POWER LIFTGATE CAUSES AND SOLUTIONS
| Status | Cause | Solution |
|---|---|---|
| Sudden opening of liftgate | Activation by mistake or malfunction of open/close switch | Check for short or malfunction of short circuit of switch |
| Latch assembly failure | Check for wiring connection | |
| Check for failure code, and replace the latch if needed | ||
| Failure of Power Liftgate or the body control module | Reset the module fuse or reconnect the battery. If it does not operate properly, check the wiring connection and analyze manual. | |
| Unable to power open and close the liftgate | False indication, or not parked status | Check a switch status using analyzing device |
| Low voltage of the Power Liftgate module battery | Check for proper voltage of the Power Liftgate | |
| Battery charged | ||
| Swelling of the fuse | Check if the fuse is swollen | |
| Malfunction of PLG spindle | Check for PLG spindle status | |
| Critical code failure at BCM/liftgate control module | Check for code status using GDS | |
| Latch assembly failure | Check if the wiring connection of fuse are swollen. | |
| Check if there's any alien object interfering with the operation of latch assembly. | ||
| Unable to open and close of the liftgate | Failure in motor assembly | Check for motor assembly |
| Interference of the consisting components | Replace the needed parts or reset the affected position. | |
| Wiring problem (system or vehicle) | Resolve the problem using the wiring map. | |
| Refer to wiring diagram. | ||
| Loss of electricity during the liftgate operation | Wiring problem (system or vehicle) | Resolve the problem using the wiring map. |
| Refer to wiring diagram. | ||
| Low voltage of vehicle battery | Check for proper voltage of PLGM. | |
| Charge the battery | ||
| Failure in Power Liftgate or BCM | Check for failure code using analyzing device | |
| Failure in motor assembly | Test the motor assembly | |
| Power latching unable at Primary/Secondary position | Latch assembly failure | Check if the wiring connection of fuse are swollen. |
| Check for failure code using analyzing device | ||
| Resolve the problem using a vehicle analyzing manual. | ||
| Replace the latch assembly if needed. | ||
| Interference of the consisting components | Replace the needed parts or reset the affected position. | |
| Failure in Power Liftgate or BCM | Check for failure code using analyzing device | |
| Excessive sealing force of the liftgate | Check for shock on sealing, assembly failure, alien object or other possible factors. | |
| Failure in motor assembly | Check the motor assembly | |
| Unable to unlock the latch at Primary position | False indication, or not parked status | Check switch status using analyzing device |
| Low voltage of the Power Liftgate module battery | Check for proper voltage of the Power Liftgate | |
| Battery charged | ||
| Swelling of the fuse | Check if the fuse is swollen | |
| Latch assembly failure | Check switch status using analyzing device | |
| Check for alien object interfering with the latch assembly operation or shock on components. | ||
| Resolve the problem using a vehicle analyzing manual. | ||
| Remove the latch assembly if needed. | ||
| Failure in outside handle connection | Check for handle joint and wiring connection. | |
| Failure of Power Liftgate or the body control module | Check for the failure code or cycle using analyzing device. | |
| Interference of the consisting components | Replace the needed parts or reset the affected position. | |
| Liftgate operation using pop/console switch unavailable. | Swelling of the fuse | Check if the fuse is swollen |
| Low voltage of PLGM | Check for proper voltage of PLGM. | |
| Charge the battery | ||
| Unable to unlock the electric lock | Failure on the latch assembly | Check for alien object interfering with the latch assembly operation or shock on components. |
| Check for the failure code or cycle using analyzing device. | ||
| Check for pole/latch switch using analyzing device. | ||
| Resolve the problem using the vehicle inspection manual | ||
| Unable to unlock the electric lock | Failure of Power Liftgate module | Resolve the problem using the vehicle inspection manual |
| Failure of Body Control Module (BCM) | Resolve the problem using the vehicle inspection manual | |
| Replace BCM if needed | ||
| Malfunctioning of wireless remote control key | Rewrite the wireless remote control key program | |
| Replace the wireless remote control key | ||
| Malfunctioning of the liftgate motor assembly | Check for alien object interfering with the motor assembly operation. | |
| Check for wiring connection | ||
| Change the assembly if motor clutch is not operable | ||
| Replace the switch if the full opening switch is not working | ||
| Resolve the problem using the vehicle inspection manual | ||
| Replace the motor if needed | ||
| Unable to maintain opened status of the liftgate | Failure on PLG spindle | Replace PLG spindle |
| Check if attached objects are damaged | ||
| Excessive operating force when opening and closing | Failure on PLG spindle | Replace PLG spindle |
| Check if attached objects are damaged | ||
| Interference of the consisting components | Replace the needed parts or reset the affected position. | |
| When liftgate keeps cinching lock mode | Failure on the latch assembly | Check if wiring connection and fuse are swollen |
| Check the switch with analyzing device | ||
| When liftgate keeps electric lock mode | Failure on the latch assembly | Check for wiring connection |
| Check for any alien object | ||
| Resolve the problem using the vehicle inspection manual | ||
| Malfunctioning of the control module | Check for failure code using analyzing device | |
| Wiring problem (system or vehicle) | Resolve the problem, referring an electric circuit | |
| Refer to wiring diagram. | ||
| Check for the vehicle inspection manual for detailed process | ||
| Failure of the motor assembly | Check for operating environments constantly | |
| Wiring problem (system or vehicle) | Resolve the problem, referring an electric circuit | |
| Refer to wiring diagram. | ||
| Very slow opening of the liftgate | Vehicle battery voltage too low | Check for proper voltage of PLGM. |
| Charge the battery | ||
| Malfunctioning of the liftgate PLG spindle = | Replace the liftgate PLG spindle if needed | |
| Interference of the consisting components | Replace the needed parts or reset the affected position. | |
| Vehicle angle too steep for electric operation | Operate the liftgate manually | |
| Malfunctioning of the liftgate motor assembly | Replace the motor assembly if needed | |
| Rattling or squeaky sound | Alien object jammed in liftgate components | Remove the alien object |
| Excessive tightening or loosening of the components | Resolve the excessive tightness or looseness |