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Pinpoint Test C: Navigation System Does Not Operate Correctly-The Global Positioning System (GPS) Antenna Signal Is Inoperative

WARNING: This page is about a different car, the 2004 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: The vehicle must be driven outside of any enclosed structure to an area that is unobstructed by trees, tall buildings, and bridges.

Test Step 

  1. C1 CHECK THE RECORDED DTCS FROM THE NAVIGATION SYSTEM MODULE 
    • Use the recorded results from the navigation system module self-test.
    • Are any DTCs recorded? 

    Result / Action to Take 

    1. Yes  : For DTC B2204, GO to C2.
    2. No  : GO to  C6.
  2. C2 CHECK THE GPS ANTENNA FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: GPS Antenna.
    • Measure the resistance between the GPS antenna center conductor pin, component side and the GPS antenna shield, component side.
      Fig 1: Measuring Resistance Between GPS Antenna Center Conductor Pin
      G03203293Courtesy of FORD MOTOR CO.
    • Is the resistance between 80 and 125 ohms? 
    1. Yes  : GO to C3.
    2. No  : INSTALL a new GPS antenna. REFER to GLOBAL POSITIONING SYSTEM (GPS) ANTENNA . CLEAR the DTCs. REPEAT the self-test.
  3. C3 CHECK THE COAXIAL CABLE CENTER CONDUCTOR FOR A SHORT TO GROUND - NAVIGATION SYSTEM MODULE DISCONNECTED 
    • Disconnect: Navigation System Module GPS Antenna.
    • Measure the resistance between the navigation system module GPS antenna coaxial cable center conductor pin, harness side and ground.
      Fig 2: Measuring Resistance Between Navigation System Module GPS Antenna Coaxial Cable Center Conductor Pin Harness Side And Ground
      G03203294Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. Yes  : GO to C4.
    2. No  : INSTALL a new antenna coaxial cable. CLEAR the DTCs. REPEAT the self-test.
  4. C4 CHECK THE COAXIAL CABLE CENTER CONDUCTOR FOR AN OPEN 
    • Measure the resistance between the GPS antenna coaxial cable center conductor pin, harness side and the navigation system module GPS antenna coaxial cable center conductor pin, harness side.
      Fig 3: Checking Coaxial Cable Center Conductor For Open
      G03203295Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to C5.
    2. No  : INSTALL a new antenna coaxial cable. CLEAR the DTCs. REPEAT the self-test.
  5. C5 CHECK THE COAXIAL CABLE SHIELD FOR AN OPEN 
    • Measure the resistance between the GPS antenna coaxial cable shield, harness side and the navigation system module GPS antenna coaxial cable shield, harness side.
      Fig 4: Checking Coaxial Cable Shield For Open
      G03203296Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to  C9.
    2. No  : INSTALL a new antenna coaxial cable. CLEAR the DTCs. REPEAT the self-test.
  6. C6 CHECK THE NAVIGATION SYSTEM 
    • Move the vehicle outside of any enclosed structure to an area that is unobstructed by trees, tall buildings, and bridges.
    • Turn the audio unit on.
    • Press the MAP button.
      Fig 5: Identifying Display Of Navigation System (1 Of 7)
      G03203297Courtesy of FORD MOTOR CO.
      Fig 6: Identifying Display Of Navigation System (2 Of 7)
      G03203298Courtesy of FORD MOTOR CO.
    • Does the GPS icon disappear? 
    1. Yes  : The system is operating correctly at this time.
    2. No  : GO to C7.
  7. C7 CHECK THE GPS SIGNAL STATUS 
    • Press and hold the AUDIO and MENU buttons for 5 seconds.
      Fig 7: Identifying Display Of Navigation System (3 Of 7)
      G03203299Courtesy of FORD MOTOR CO.
    • Press 917 Enter.
      Fig 8: Identifying Display Of Navigation System (4 Of 7)
      G03203300Courtesy of FORD MOTOR CO.
    • Select Navigation Info.
      Fig 9: Identifying Display Of Navigation System (5 Of 7)
      G03203301Courtesy of FORD MOTOR CO.
    • Select GPS Information.
      Fig 10: Identifying Display Of Navigation System (6 Of 7)
      G03203302Courtesy of FORD MOTOR CO.
    • Monitor the GPS status.
      Fig 11: Identifying Display Of Navigation System (7 Of 7)
      G03203303Courtesy of FORD MOTOR CO.
    • After 10 minutes, does the ST (status) column of the GPS information display P (position) or T (tracking)? 
    1. Yes  : The system is operating correctly at this time.
    2. No  : GO to C8.
  8. C8 SUBSTITUTE THE GPS ANTENNA 
    • Substitute a known good GPS antenna.
    • After 10 minutes, does the ST (status) column of the GPS information display P (position) or T (tracking)? 
    1. Yes  : INSTALL a new GPS antenna. Refer to GLOBAL POSITIONING SYSTEM (GPS) ANTENNA . CLEAR the DTCs. REPEAT the self-test.
    2. No  : REINSTALL the original antenna. GO to C9.
  9. C9 CHECK FOR CORRECT NAVIGATION SYSTEM MODULE OPERATION 
    • Disconnect all navigation system module connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all navigation system module connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. Yes  : INSTALL a new navigation system module. REFER to NAVIGATION SYSTEM MODULE . TEST the system for normal operation.
    2. No  : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
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