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Inspection and Verification

  1. Verify the customer concern.
  2. Visually inspect for obvious signs of mechanical or electrical damage.
    VISUAL INSPECTION CHART

    Mechanical Electrical
    • Stoplamp switch
    • Battery Junction Box (BJB) fuse(s):
      • 59 (10A) (stoplamp switch)
      • 60 (15A) (LH and RH rear stoplamps) (Edge)
    • Body Control Module (BCM) fuse(s):
      • 13 (15A) (RH rear stoplamp) (MKX)
      • 14 (15A) (LH rear stoplamp) (MKX)
      • 15 (15A) (high mounted stoplamp)
    • Bulb(s)
    • Bulb socket(s)
    • Wiring, terminals or connectors
    • Stoplamp relay
    • High mounted stoplamp
    • Rear lamp assembly
  3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
    4. NOTE: Make sure to use the latest scan tool software release.
  4. If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).
    5. NOTE: The Vehicle Communication Module (VCM) LED prove-out confirms power and ground from the DLC  are provided to the VCM  .
  5. 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.
  6. 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.
  7. 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.
  8. Clear the continuous DTCs and carry out the self-test diagnostics for the BCM  .
  9. 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 .
  10. If no DTCs related to the concern are retrieved, GO to SYMPTOM CHART .
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