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Pinpoint Test A: The Compass Is Inaccurate/Inoperative

WARNING: This page is about a different car, the 2008 Ford RV Cutaway, 2008 Ford Econoline, 2008 Ford E450 Super Duty, and 2008 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Always demagnetize a vehicle before installing a new compass.
NOTE: After installing a new compass, always set the zone and calibrate.
  1. A1 CHECK THE OVERHEAD COMPASS DISPLAY 
    • Key in ON position.
    • Check the overhead display.
    • Does the overhead compass display remain on after prove out? 
    1. YES  : Go to  A3.
    2. NO  : Go to  A2.
  2. A2 CHECK THE COMPASS MODE 
    • Press and release the SELECT switch on the overhead console.
    • Does the overhead compass display turn on? 
    1. YES  : If the compass display turns on correctly, go to  A3.

      If the compass display turns on, but the heading is inoperative/inaccurate or the display indicates VAR, go to  A4.

      If the compass display turns on, but it does not display all directions, or indicates CAL, go to  A5.

    2. NO  : Go to  A7.
  3. A3 CHECK THE COMPASS DIMMING 
    • Turn the headlamp switch to the PARKING LAMPS ON position.
    • Does the compass display dim? 
    1. YES  : TURN the headlamp switch to the OFF position. Go to  A4.
    2. NO  : TURN the headlamp switch to the OFF position. Go to  A8.
  4. A4 CHECK THE COMPASS ZONE SETTING 
    • Set the compass to the correct zone for the vehicle geographical location. Refer to Compass Zone Adjustment .
    • Does the zone adjustment set correctly? 
    1. YES  : Go to  A5.
    2. NO  : INSTALL a new compass display. REFER to Compass Display . TEST the system for normal operation.
  5. A5 CALIBRATE THE COMPASS 
    • Calibrate the compass. Refer to Compass Calibration .
    • Does the compass calibrate correctly? 
    1. YES  : Go to  A6.
    2. NO  : INSTALL a new compass display. REFER to Compass Display . TEST the system for normal operation.
  6. A6 CHECK THE COMPASS ACCURACY 
    • Position the vehicle at each of the 8 directions (N, NE, E, SE, S, SW, W, NW) and verify that the displayed heading is accurate. The vehicle must be stationary for at least 10 seconds at each direction.
    • Is the compass display accurate in each direction? 
    1. YES  : The compass is OK. REVIEW the operation of the compass with the customer.
    2. NO  : INSTALL a new compass display. REFER to Compass Display . TEST the system for normal operation.
  7. A7 CHECK THE VOLTAGE SUPPLY TO THE COMPASS DISPLAY 
    • Key in OFF position.
    • Disconnect: Overhead Console C930
    • Key in ON position.
      • Fig 1: Checking Voltage Supply To Compass Display
      GF0012976Courtesy of FORD MOTOR CO.
    • Measure the voltage between the overhead console C930-1, circuit 137 (YE/BK), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : TURN the key to the OFF position. Go to  A9.
    2. NO  : VERIFY the CJB fuse 3 (15A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
  8. A8 CHECK THE DIMMING CIRCUIT 
    • Key in OFF position.
    • Disconnect: Overhead Console C930
    • Turn the headlamp switch to the PARKING LAMPS ON position.
      • Fig 2: Checking Dimming Circuit
      GF0012977Courtesy of FORD MOTOR CO.
    • Measure the voltage between the overhead console C930-4, circuit 14 (BN), harness side and ground and rotate the headlamp switch knob counterclockwise to the stop position.
    • With the headlamp switch knob in the full stop (counterclockwise) position, is the voltage greater than 10 volts? 
    1. YES  : Go to  A9.
    2. NO  : REFER to INSTRUMENT CLUSTER AND PANEL ILLUMINATION article to diagnose the instrument cluster and panel illumination.
  9. A9 CHECK CIRCUIT 1205 (BK) FOR AN OPEN 
      Fig 3: Checking Circuit 1205 (BK) For An Open
      GF0014712Courtesy of FORD MOTOR CO.
    • Measure the resistance between the overhead console C930-2, circuit 1205 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new compass display. REFER to Compass Display . TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
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