Diagnostic Test

CHECK FOR ACTIVE DTCS
1. With the scan tool, record the PLGM DTCs and any liftgate inhibitors.
2. Erase the DTCs.
3. Turn the ignition off, wait 10 seconds, then turn the ignition on.
4. Operate the liftgate to the full up position and wait 30 seconds.
5. Close the liftgate and repeat the previous step.
6. With the scan tool, read the Active DTCs.
  Does the scan tool display; B1963-00-POWER LIFTGATE STRUT PERFORMANCE?
  
  Yes
  - Go To 2
  No
  - Make sure there is no intermittent binding or cold weather condition which may have caused this code to set.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK FOR WEAK STRUT AT PARTIAL OPEN
1. Manually open the liftgate to approximately 1/4 open position.
2. Let go of the liftgate and see if it will slam shut.
3. If necessary, compare the effort to open and close the liftgate with a known good vehicle.
  NOTE:
  At this point the liftgate should hold in this position but it may slip down very slowly which is passable.
  
  Does the liftgate hold in position or lower very slowly?
  
  Yes
  - Go To 3
  No
  - Replace the Liftgate Gas Prop (strut) in accordance with the Service Information.
    Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK FOR WEAK STRUT WHEN FULLY OPEN
1. Manually open the liftgate to the full open position.
2. Leave go of the liftgate and see if it will stay in the full up position.
  Does the liftgate stay in the full up position as it should?
  
  Yes
  - Test complete. Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Liftgate Gas Prop (strut) in accordance with the Service Information.
    Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .