Circuit/System Verification

Ignition ON.
Verify the K39 Liftgate Control Module is programmed with the latest and correct software.
- If the software is not the latest or is not the correct software
  Refer to Control Module References for liftgate control module replacement, programming and setup.
- Go to next step: If the software is the latest and is correct
Verify the K39 Liftgate Control Module does not have any current DTCs set.
- If the K39 Liftgate Control Module has current DTCs set
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle
- Go to next step: If the K39 Liftgate Control Module does not have any current DTCs set
Verify DTC B2494 or B153F is not set as a history DTC.
- DTC B2494 is set only as history
  Refer to Liftgate Release Switch Replacement (Door)
- DTC B153F is set only as history
  Refer to Liftgate Side Sensor Replacement
- Go to next step: If the K39 Liftgate Control Module does not have any history DTCs set
Verify the scan tool Liftgate Mode Switch parameter changes from Off to 3/4 to Maximum while rotating the S45B Liftgate Control Switch-Interior.
- If the parameter does not change
  Refer to DTC B396C or B396D - Liftgate Interior Release Open/Close Switch Malfunction .
- Go to next step: If the parameter changes
Verify the scan tool Liftgate Front Control Switch parameter changes between Inactive and Active when pressing the S45B Liftgate Control Switch-Interior.
- If the parameter does not change
  Refer to DTC B396C or B396D - Liftgate Interior Release Open/Close Switch Malfunction .
- Go to next step: If the parameter changes
Liftgate Closed, verify the scan tool Liftgate Latch Pawl Switch, Liftgate Latch Ratchet Switch, and Liftgate Latch Sector Switch parameters are as listed below:
- Liftgate Latch Pawl Switch parameter Close
- Liftgate Latch Ratchet Switch parameter Close
- Liftgate Latch Sector Switch parameter Inactive
- If any of the parameters are not as listed
  Refer to DTC B153A - Liftgate Latch Switches Malfunction .
- Go to next step: If the parameters are as listed
Verify the scan tool Liftgate Handle Switch parameter changes between Active and Inactive when pressing the S46B Liftgate Unlatch Switch.
- If the parameter does not change
  Refer to DTC B2494 - Liftgate Handle Switch Malfunction .
- Go to next step: If the parameter changes
Verify the liftgate will release and smoothly power open when commanding Liftgate Open with a scan tool.
- If the liftgate does not release
  Refer to Liftgate Latch Release/Cinch Malfunction
- If the liftgate releases but does not open
  Refer to Power Liftgate Malfunction
- If the liftgate releases but performs an erratic power open/close motion
  Refer to Power Liftgate Malfunction
- Go to next step: If the liftgate smoothly opens
Liftgate Open, verify that the liftgate will remain at or near the full open position and does not slowly close.
- If the liftgate will not remain open or begins to slowly close
  Refer to Liftgate Strut Replacement .
- Go to next step: If the liftgate remains in the full open position
Liftgate Open, verify the scan tool Liftgate Secondary Obstacle Detection parameter is between 3V-3.5V.
- If not between 3V-3.5V
  Refer to DTC B153F - Liftgate Object Sensor Malfunction .
- Go to next step: If between 3V-3.5V
Liftgate Open, verify the scan tool Liftgate Latch Pawl Switch, Liftgate Latch Ratchet Switch, and Liftgate Latch Sector Switch parameters are as listed below
- Liftgate Latch Pawl Switch parameter Open
- Liftgate Latch Ratchet Switch parameter Open
- Liftgate Latch Sector Switch parameter Inactive
- If any of the parameter are not as listed
  Refer to DTC B153A - Liftgate Latch Switches Malfunction .
- Go to next step: If the parameters are as listed
Verify the scan tool Liftgate Rear Close Switch parameter changes between Active and Inactive when pressing the B70 Liftgate Close Switch.
- If the parameter does not change
  Refer to DTC B396E - Liftgate Close Switch Malfunction .
- Go to next step: If the parameter changes
Verify the liftgate will smoothly power close when commanding Liftgate Close with a scan tool.
- If the liftgate does not power close and sets DTC B396A
  Refer to DTC B396A - Liftgate Motor Power Open/Close Malfunction
- If the liftgate performs an erratic open/close motion and does not set a DTC
  Refer to Power Liftgate Malfunction
- Go to next step: If the liftgate smoothly power closes

NOTE:

Refer to the owner's manual for the location of the kick sensors prior to performing the kicking motion

If equipped, liftgate Closed, with the keyless entry transmitter within 3 feet (1 meter) of the liftgate, activate the handsfree liftgate release system with a kicking motion of a foot under the rear fascia.The tail lamps will flash 3 times if the liftgate handsfree sensors detect the motion.
- If the tail lamps do not flash
  Refer to Liftgate Handsfree Sensor Malfunction
- Go to next step: If the tail lamps flash
All OK.