Diagnostic Test

CHECK FOR ACTIVE DTCS
1. With the scan tool, record and erase the DTCs.
2. Cycle the ignition off, wait 10 seconds, then cycle the ignition on.
3. Operate the power liftgate several times if possible.
4. With the scan tool, read the Active DTCs.
  Does the scan tool display; B1968-00-POWER LIFTGATE OPEN DIRECTION - EXCESSIVE TIME?
  
  Yes
  - Go To 2
  No
  - Using the wiring diagram/schematic as a guide, inspect the wiring and connectors for an intermittent condition. Operate the liftgate several times and check for any binding conditions.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK FOR A BINDING LIFTGATE
1. Examine the liftgate for proper alignment, worn or binding hinges, weak liftgate prop assembly, or loose/hard weatherstrip or anything that would cause an obstruction to proper operation. Check for the possibility of the liftgate having been overloaded due to ice or heavy snow.
2. Raise the liftgate and check the struts for proper operation.
3. If necessary manually operate the liftgate of a known good vehicle and notice the effort needed.
4. Compare the effort needed on the disabled vehicle.
  Were there any mechanical problems found?
  
  Yes
  - Refer to Standard Procedures according to the Service Information. Refer to STANDARD PROCEDURE - LIFTGATE OPERATION .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 3
OPERATE THE POWER LIFTGATE DRIVE UNIT
1. Re-connect the Power Liftgate Module C1 connector.
2. Operate the Power Liftgate in both directions if possible.
  Does the motor start to lift the liftgate but is very slow and labors extensively?
  
  Yes
  - Replace the Power Liftgate Drive Unit in accordance with the Service Information. Refer to DRIVE UNIT, POWER, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Power Liftgate Module in accordance with the Service Information. Refer to MODULE, POWER LIFTGATE (PLGM), REMOVAL .
  - Test complete. Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .