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Pinpoint Test As: DTC U3003:16 Global Positioning System Module (GPSM)

WARNING: This page is about a different car, the 2013 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. REFER to BATTERY, MOUNTING AND CABLES .
  1. AS1 RECHECK THE GPSM DTCs 
    • CLEAR the GPSM DTCs.
    • Ignition OFF.
    • Ignition ON.
    • Wait at least 15 seconds.
    • REPEAT the GPSM self-test.
    • Is DTC U3003:16 still present? 
    • Yes  : GO to AS2.
    • No  : The system is operating correctly at this time. The DTC may have set due to a previous low battery voltage condition.
  2. AS2 CHECK FOR CHARGING SYSTEM DTCs IN THE PCM 
    • Retrieve the continuous memory DTCs from all modules.
    • Is DTC P0620, P0622, P0625, or P065B set in the PCM? 
  3. AS3 CHECK THE BATTERY CONDITION AND STATE OF CHARGE 
    • Check the battery condition and verify that the battery is fully charged. REFER to BATTERY, MOUNTING AND CABLES .
    • Is the battery OK and fully charged? 
  4. AS4 CHECK THE GPSM VOLTAGE SUPPLY 
    • Ignition OFF.
    • Measure and record the voltage at the battery.
    • Disconnect: GPSM C2398.
    • Ignition ON.
    • Measure the voltage  between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      C2398-1 SBP14 (BN/RD) - Ground
      Fig 1: Identifying GPSM C2398 Connector Terminals
      G08646111Courtesy of FORD MOTOR CO.
    • Is the voltage within 0.2 volt of the recorded battery voltage? 
    • Yes  : GO to AS5.
    • No  : REPAIR the circuit. CLEAR the DTC. REPEAT the self-test.
  5. AS5 CHECK THE GPSM GROUND CIRCUITS 
    • Ignition OFF.
    • Disconnect: Negative Battery Cable.
    • Measure the resistance  between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      C2398-6 GD115 (BK/GY) - Ground
      Fig 2: Identifying GPSM C2398-6 Connector Terminals
      G08646112Courtesy of FORD MOTOR CO.
    • Is the resistance less than 3 ohms? 
    • Yes  : GO to AS6.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  6. AS6 CHECK FOR CORRECT GPSM OPERATION 
    • Disconnect the GPSM connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all the GPSM connectors and make sure they seat correctly.
    • Is the concern still present? 
    • Yes  : INSTALL a new GPSM. REFER to GLOBAL POSITIONING SYSTEM MODULE (GPSM) . TEST the system for normal operation.
    • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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