Pinpoint Test B: Navigation System Does Not Operate Correctly - No Global Positioning System (GPS) Antenna Signal

Test Step 

B1 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 

Yes 

For DTC B2204, GO to B2. For all other DTCs, REFER to NAVIGATION SYSTEM MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX  .

No 

GO to B6.

Test Step 

B2 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: Checking GPS Antenna For An Open

  Courtesy of FORD MOTOR CO.
• Is the resistance between 80 and 125 ohms? 

Result / Action to Take 

Yes 

GO to B3.

No 

INSTALL a new GPS antenna. REFER to GLOBAL POSITIONING SYSTEM (GPS) ANTENNA  . CLEAR the DTCs. REPEAT the self-test.

Test Step 

B3 CHECK THE COAXIAL CABLE CENTER CONDUCTOR FOR A SHORT TO GROUND WITH THE 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: Checking Coaxial Cable Center Conductor For A Short To Ground - Navigation System Module Disconnected

  Courtesy of FORD MOTOR CO.
• Is the resistance greater than 10,000 ohms? 

Result / Action to Take 

Yes 

GO to B4.

No 

INSTALL a new antenna coaxial cable. CLEAR the DTCs. REPEAT the self-test.

Test Step 

B4 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 An Open

  Courtesy of FORD MOTOR CO.
• Is the resistance less than 5 ohms? 

Result / Action to Take 

Yes 

GO to B5.

No 

INSTALL a new antenna coaxial cable. CLEAR the DTCs. REPEAT the self-test.

Test Step 

B5 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 An Open

  Courtesy of FORD MOTOR CO.
• Is the resistance less than 5 ohms? 

Result / Action to Take 

Yes 

GO to B9.

No 

INSTALL a new antenna coaxial cable. CLEAR the DTCs. REPEAT the self-test.

Test Step 

B6 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: Selecting "MAP"

  Courtesy of FORD MOTOR CO.
• Monitor the GPS icon.
  Fig 6: Identifying GPS Icon

  Courtesy of FORD MOTOR CO.
• Does the GPS icon disappear? 

Result / Action to Take 

Yes 

The system is operating correctly at this time.

No 

GO to B7.

Test Step 

B7 CHECK THE GPS SIGNAL STATUS 

• Press and hold the AUDIO and MENU buttons for 5 seconds.
  Fig 7: Pressing/Holding "AUDIO" And "MENU

  Courtesy of FORD MOTOR CO.
• Press 917 Enter.
  Fig 8: Pressing 917 Enter

  Courtesy of FORD MOTOR CO.
• Select Navigation Info.
  Fig 9: Selecting "Navigation Info"

  Courtesy of FORD MOTOR CO.
• Select GPS Information.
  Fig 10: Selecting "GPS Information"

  Courtesy of FORD MOTOR CO.
  Fig 11: Identifying GPS Information Screen

  Courtesy of FORD MOTOR CO.
• After 10 minutes, does the ST (status) column of the GPS information display P (position) or T (tracking)? 

Result / Action to Take 

Yes 

The system is operating correctly at this time.

No 

GO to B8.

Test Step 

B8 SUBSTITUTE THE GPS ANTENNA 

• Substitute a known good GPS antenna.
• After 10 minutes, does the ST column of the GPS information display P or T? 

Result / Action to Take 

Yes 

INSTALL a new GPS antenna. REFER to GLOBAL POSITIONING SYSTEM (GPS) ANTENNA  . CLEAR the DTCs. REPEAT the self-test.

No 

REINSTALL the original antenna. GO to B9.

Test Step 

B9 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? 

Result / Action to Take 

Yes 

INSTALL a new navigation system module. REFER to NAVIGATION SYSTEM MODULE  . CLEAR the DTCs. REPEAT the self-test.

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.