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Inspection and Verification

WARNING: This page is about a different car, the 2009 Mercury Sable, 2009 Ford Taurus X, and 2009 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify the customer concern.
  2. The battery voltage must be at normal operating levels in order for the power liftgate to open and close correctly. Make sure the battery and charging systems are operating correctly before proceeding with the power liftgate diagnosis.
  3. Visually inspect for obvious signs of mechanical and electrical damage. Refer to VISUAL INSPECTION CHART .
    VISUAL INSPECTION CHART

    Mechanical Electrical
    • Power liftgate drive assembly
    • Power liftgate rod assembly
    • Power liftgate cinching latch
    • Power liftgate pinch strip switches
    • Liftgate and liftgate hinges
    • Liftgate assist cylinders
    • Liftgate strikers
    • Exterior release handle
    • Liftgate weatherstrip
    • Liftgate alignment to body and striker
    • Wedges
    • Excessive weight on the liftgate (for example: bike rack or snow and ice)
    • Battery Junction Box (BJB) fuse 29 (30A)
    • Smart Junction Box (SJB) fuse(s):
      • 14 (10A)
      • 17 (20A)
    • Circuitry
    • Power liftgate control switch - instrument panel
    • Power liftgate rear control switch - quarter trim panel
    • Power liftgate position sensor
    • Power liftgate latch
      • detent switch
      • primary forkbolt switch
      • secondary forkbolt switch
      • sector gear open switch
      • sector gear close switch
      • unlatch/cinching motor
    • Liftgate/Trunk Module (LTM)
    • SJB
  4. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
    5. NOTE: Make sure to use the latest scan tool software release.
  5. If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).
    6. NOTE: The Vehicle Communication Module (VCM) LED prove out confirms power and ground from the DLC are provided to the VCM.
  6. If the scan tool does not communicate with the VCM:
    • check the VCM connection to the vehicle.
    • check the scan tool connection to the VCM.
    • refer to MODULE COMMUNICATIONS NETWORK article, No Power To The Scan Tool, to diagnose no power to the scan tool.
  7. If the scan tool does not communicate with the vehicle:
    • verify the ignition key is in the ON position.
    • verify the scan tool operation with a known good vehicle.
    • refer to MODULE COMMUNICATIONS NETWORK article to diagnose no response from the Liftgate/Trunk Module (LTM) or Smart Junction Box (SJB).
  8. Carry out the network test.
    • If the scan tool responds with no communication for one or more modules, refer to MODULE COMMUNICATIONS NETWORK article.
    • If the network test passes, retrieve and record Continuous Memory Diagnostic Trouble Codes (CMDTCs).
    9. NOTE: Carrying out the LTM initialization procedure will resolve concerns where the power liftgate has lost position or was not initialized correctly. For information, refer to Power Liftgate Initialization .
  9. Clear the CMDTCs and carry out the self-test diagnostics for the power liftgate or SJB.
  10. If the DTCs retrieved are related to the concern, go to the LIFTGATE/TRUNK MODULE (LTM) DTC TABLE  or the SMART JUNCTION BOX (SJB) DTC TABLE . For all other DTCs, refer to MULTIFUNCTION ELECTRONIC MODULES article.
  11. If no DTCs related to the concern are retrieved, go to Symptom Chart .
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