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Inspection and Verification: Notes

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

    Mechanical Electrical
    • Audio unit
    • Antenna or antenna cable(s)
    • Global positioning system (GPS) antenna
    • Navigation map DVD
    • Satellite radio antenna
    • Speakers, mounting/speaker cones
    • Radio ignition interference capacitors, radio frequency interference suppression bond, and radio receiver hood bonding strap
    • Smart junction box (SJB) fuse(s):
      • 6 (5A) (audio unit)
      • 20 (10A) (audio unit)
    • Bussed electrical center (BEC) fuse(s):
      • 6 (30A) (luggage compartment amplifiers)
      • 9 (30A) (luggage compartment amplifiers)
      • 16 (30A) (door amplifiers)
      • 56 (20A) (audio unit, satellite radio receiver)
    • Circuitry
  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 communication with the scan tool.
  6. 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 to diagnose no response from the powertrain control module (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 diagnostic trouble codes (DTCs).
  8. Clear the continuous DTCs and carry out the self-test diagnostics for the audio unit.
  9. If the DTCs retrieved are related to the concern, go to AUDIO UNIT DIAGNOSTIC TROUBLE CODE (DTC) INDEX  or SATELLITE RADIO RECEIVER DIAGNOSTIC TROUBLE CODE (DTC) INDEX .
  10. If no DTCs related to the concern are retrieved, go to the Speaker Walk-Around Test, the Audio Unit Self-Diagnostic Mode, the Navigation Audio Unit Self Diagnostic Mode, or the Satellite Audio Bezel Diagnostic Test.
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