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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 333 (Power Door Lock System And Release Systems) >> Diagnostic Information and Procedures >> Liftgate System Diagnosis >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. 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.

    • If the software is the latest and is correct 
  3. Verify the K39 Liftgate Control Module does not have any current DTCs set.
    • If the K39 Liftgate Control Module does not have any current DTCs set 
  4. Verify DTC B2494 or B153F is not set as a history DTC.
    • If the K39 Liftgate Control Module does not have any history DTCs set 
  5. 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 changes 
  6. 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 changes 
  7. 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 the parameters are as listed 
  8. Verify the scan tool Liftgate Handle Switch parameter changes between Active and Inactive when pressing the S46B Liftgate Unlatch Switch.
    • If the parameter changes 
  9. Verify the liftgate will release and smoothly power open when commanding Liftgate Open with a scan tool.
    • If the liftgate smoothly opens 
  10. Liftgate Open, verify that the liftgate will remain at or near the full open position and does not slowly close.
    • If the liftgate remains in the full open position 
  11. Liftgate Open, verify the scan tool Liftgate Secondary Obstacle Detection parameter is between 3V-3.5V.
    • If between 3V-3.5V 
  12. 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 the parameters are as listed 
  13. Verify the scan tool Liftgate Rear Close Switch parameter changes between Active and Inactive when pressing the B70 Liftgate Close Switch.
    • If the parameter changes 
  14. Verify the liftgate will smoothly power close when commanding Liftgate Close with a scan tool.
    • If the liftgate smoothly power closes 
    15. NOTE:

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

  15. 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 flash 
  16. All OK.
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