LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 2015 >> SRX Base, 4D Utility >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Power Door Lock System And Release Systems >> Diagnostic Information and Procedures >> Liftgate System Diagnosis >> Circuit/System Verification
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit/System Verification

  1. Ignition ON.
  2. Verify the K39 Liftgate Control Module is programmed with the latest software.
    • If the software is not the latest 

      Refer to Control Module References for liftgate control module replacement, programming and setup.

    • If the software is the latest 
  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 is between 125 counts and 350 counts and changes while rotating the S45B Liftgate Control Switch-Interior.
    • If between 125 counts and 350 counts and 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. Using either the power door lock switches or the keyless entry transmitter, LOCK all doors then UNLOCK all doors. This will set the liftgate module door lock status to unlock.
  10. Verify the A23C Liftgate Latch Assembly will release the liftgate when pressing the S46B Liftgate Unlatch Switch.
    • If the A23C Liftgate Latch Assembly does release 
  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 Angle parameter changes from 0° to approximately 70° while opening and closing the liftgate.
    • If the parameter does change 
  14. 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 
    15. NOTE:

    Verify the S45B Liftgate Control Switch-Interior has been set to the 3/4 or Max position.

  15. Verify the liftgate will power close by pressing the pressing the B70 Liftgate Close Switch.
    • If the liftgate power closes 
    16. NOTE:

    Verify the S45B Liftgate Control Switch-Interior has been set to the 3/4 or Max position.

  16. Verify the liftgate will power open by pressing the pressing the S45B Liftgate Control Switch-Interior.
    • If the liftgate power opens 
  17. Verify the liftgate has not been auto reversing un-expectedly.
    • If the liftgate has been auto reversing, inspect the following listed below: 
    • Pump actuator hoses for twists or kinks.
    • Fluid leaks.
    • Both liftgate object sensors for interference or deformity
    • If the liftgate has not been auto reversing un-expectedly 
  18. All OK.
scientia non olet · About LEMON Manuals