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Diagnostic Test

  1. CHECK FOR ACTIVE DTCS 
    1. With the scan tool, record and erase DTCs.
    2. Cycle the ignition off, wait 10 seconds, then cycle the ignition on.
    3. Operate the Power Liftgate several times from stop to stop if possible.
    4. With the scan tool, read the Active DTCs.

      Does the scan tool display; B1969-00-POWER LIFTGATE OPEN DIRECTION EXCESSIVE POSITION SENSOR COUNTS?

      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 .
  2. CHECK FOR A BINDING LIFTGATE 
    1. Examine the liftgate for proper alignment, worn or binding hinges, weak liftgate prop assembly, loose/hard weatherstrip, for wear or anything that would cause an obstruction to proper operation.
    2. If necessary manually operate the power liftgate on a known good vehicle and notice the effort needed to open and close for comparison.

      Were there any mechanical problems found?

      Yes 

      No 

      • Go To  3
  3. CHECK THE POWER LIFTGATE MODULE - POSITION SENSE OPEN 
    1. Operate the liftgate from the full closed position and put an obstacle in its path to make it reverse.

      Did the liftgate reverse back to the closed position?

      Yes 

      • Go To  4

      No 

      • Check to see if there is an updated flash for this module. If there is not an updated flash available, replace the Power Liftgate Module in accordance with the service information. Refer to MODULE, POWER LIFTGATE (PLGM), REMOVAL .
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  4. CHECK THE (Q901) LOGIC GROUND FOR AN OPEN 
    1. Cycle the ignition off.
    2. Disconnect the Power Liftgate Drive Unit harness connector.
    3. Disconnect the Power Liftgate Module C2 harness connector.
    4. Measure the resistance of both of the (Q901) Logic Ground circuits between the Power Liftgate Drive Unit harness connector and the Power Liftgate Module C2 harness connector.

      Is the resistance below 2.0 Ohms for both measurements?

      Yes 

      • Go To  5

      No 

      • Repair the (Q901) Logic Ground circuit for an open.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  5. REPLACE THE POWER LIFTGATE DRIVE UNIT AND RECHECK DTCS 
    1. Turn the ignition off.
    2. Replace the Power Liftgate Drive Unit in accordance with the Service Information. Refer to DRIVE UNIT, POWER, REMOVAL .
    3. Connect the component and Power Liftgate Module (PLGM) harness connectors.
    4. Turn the ignition on.
    5. With the scan tool, erase all DTCs.
    6. Turn the ignition off for a minimum of 10.0 seconds.
    7. Turn the ignition on.
    8. Using the When Monitored and Set Conditions above and recorded data, operate the vehicle in the conditions that set the DTC.
    9. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      • 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 .

      No 

      • Replacing the faulty component repaired the fault.
      • Test complete. Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
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