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Inspection and Verification

WARNING: This page is about a different car, the 2012 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify the customer concern.
  2. Verify the exterior lighting and charging system of the vehicle is operating correctly. If not, refer to the appropriate PINPOINT TEST  .
  3. Visually inspect for obvious signs of electrical damage.
    VISUAL INSPECTION CHART

    Electrical
    • Battery Junction Box (BJB) fuse(s):
      • 17 (30A) (Trailer Brake Control (TBC) module)
      • 21 (30A) (trailer tow battery charge relay switch side)
      • 43 (15A) (trailer tow reversing lamps)
      • 54 (5A) (trailer tow battery charge relay coil)
      • 67 (20A) (trailer tow parking lamps)
      • 73 (20A) (trailer tow turn relays)
    • Body Control Module (BCM) fuse 31 (5A) (stoplamp switch input)
    • Wiring, terminals or connectors
    • Trailer tow connector
    • Trailer tow stop/turn relays
    • Trailer tow battery charge relay
    • Trailer tow parking lamp relay
    • TBC module (aftermarket)
    • Trailer
  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 , 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 is on.
      • The air bag warning indicator prove-out confirms ignition on (other indicators may not prove ignition on). If the ignition does not turn on, REFER to STEERING COLUMN SWITCHES to diagnose no power in run.
    • verify the scan tool operation with a known good vehicle.
    • REFER to MODULE COMMUNICATIONS NETWORK , The PCM Does Not Respond To The Scan Tool, to diagnose no response from the PCM.
  8. Carry out the network test.
    • If the scan tool responds with no communication for one or more modules, REFER to MODULE COMMUNICATIONS NETWORK .
    • If the network test passes, retrieve and record the continuous memory DTCs.
  9. Clear the continuous DTCs and carry out the self-test diagnostics for the BCM.
  10. If the DTCs retrieved are related to the concern, refer to DIAGNOSTIC TROUBLE CODE (DTC) CHART  . For all other DTCs, refer to the Diagnostic Trouble Code (DTC) Chart in MULTIFUNCTION ELECTRONIC MODULES .
  11. If no DTCs related to the concern are retrieved, GO to SYMPTOM CHART .
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