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Home >> Ford >> 2008 >> Expedition RWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Cluster (Ic), Message Center, And Warning Chimes >> Diagnostic Tests >> Instrumentation, Message Center and Warning Chimes >> Pinpoint Tests >> Pinpoint Test AM: The Compass Is Inoperative >> Pinpoint Test Am: The Compass Is Inoperative

Pinpoint Test Am: The Compass Is Inoperative

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. AM1 RETRIEVE THE RECORDED DTCs FROM THE INSTRUMENT CLUSTER (IC) CONTINUOUS AND ON-DEMAND SELF-TESTS 
    • Check for instrument cluster (IC) DTCs from the continuous and on-demand self-tests.
    • Is DTC B2097 recorded? 
    1. YES  : INSTALL a new compass module. REPEAT the self-test. CLEAR the DTCs.
    2. NO  : If DTC U2013 is recorded, go to  AM2.

      For all other DTCs, REFER to DTC Charts .

  2. AM2 CHECK CIRCUIT CBP31 (BU/OG) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: Compass Sensor Module C909 or Rear view Camera Display Mirror C9039
    • Key in ON position.
      • Fig 1: Checking Circuit CBP31 (BU/OG) For Voltage - Stand Alone Compass Sensor Module
      GF0008209Courtesy of FORD MOTOR CO.
    • If equipped with the stand alone compass sensor module, measure the voltage between the compass sensor module C909-3, circuit CBP31 (BU/OG), harness side and ground.
      • Fig 2: Checking Circuit CBP31 (BU/OG) For Voltage - Rear Video Camera Display Mirror
      GF0041116Courtesy of FORD MOTOR CO.
    • If equipped with the rear video camera display mirror, measure the voltage between the compass sensor module C9039-1, circuit CBP31 (BU/OG), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  AM3.
    2. NO  : VERIFY the SJB fuse 31 (10A) is OK. If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  3. AM3 CHECK CIRCUIT GD133 (BK) FOR AN OPEN 
    • Key in OFF position.
      • Fig 3: Checking Circuit GD133 (BK) For An Open - Stand Alone Compass Sensor Module
      GF0008210Courtesy of FORD MOTOR CO.
    • If equipped with the stand alone compass sensor module, measure the resistance between the compass sensor module C909-4, circuit GD133 (BK), harness side and ground.
      • Fig 4: Checking Circuit GD133 (BK) For An Open - Rear Video Camera Display Mirror
      GF0041118Courtesy of FORD MOTOR CO.
    • If equipped with the rear video camera display mirror, measure the resistance between the compass sensor module C9039-3, circuit GD133 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  AM4.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  4. AM4 CHECK CIRCUIT VMC31 (YE/GN) FOR AN OPEN AND SHORT TO GROUND 
    • Disconnect: Instrument Cluster (IC) C220
      • Fig 5: Checking Circuit VMC31 (YE/GN) For An Open And Short To Ground - Stand Alone Compass Sensor Module
      GF0023370Courtesy of FORD MOTOR CO.
    • If equipped with the stand alone compass sensor module, measure the resistance between the instrument cluster (IC) C220-10, circuit VMC31 (YE/GN), harness side and the compass sensor module C909-1, circuit VMC31 (YE/GN), harness side; and between the instrument cluster (IC) C220-10, circuit VMC31 (YE/GN), harness side and ground.
      • Fig 6: Checking Circuit VMC31 (YE/GN) For An Open And Short To Ground - Rear Video Camera Display Mirror
      GF0047019Courtesy of FORD MOTOR CO.
    • If equipped with the rear video camera display mirror, measure the resistance between the instrument cluster (IC) C220-10, circuit VMC31 (YE/GN), harness side and the rear video camera display mirror C9039-9, circuit VMC31 (YE/GN), harness side; and between the instrument cluster (IC) C220-10, circuit VMC31 (YE/GN), harness side and ground.
    • Is the resistance less than 5 ohms between the instrument cluster (IC) and the compass sensor module, and greater than 10,000 ohms between the instrument cluster (IC) and ground? 
    1. YES  : Go to  AM5.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  5. AM5 CHECK CIRCUIT VMC30 (BU/GY) FOR AN OPEN AND SHORT TO GROUND 
      Fig 7: Checking Circuit VMC30 (BU/GY) For An Open And Short To Ground - Stand Alone Compass Sensor Module
      GF0023371Courtesy of FORD MOTOR CO.
    • If equipped with the stand alone compass sensor module, measure the resistance between the instrument cluster (IC) C220-11, circuit VMC30 (BU/GY), harness side and the compass sensor module C909-2, circuit VMC30 (BU/GY), harness side; and between the instrument cluster (IC) C220-11, circuit VMC30 (BU/GY), harness side and ground.
      • Fig 8: Checking Circuit VMC30 (BU/GY) For An Open And Short To Ground - Rear Video Camera Display Mirror
      GF0047020Courtesy of FORD MOTOR CO.
    • If equipped with the rear video camera display mirror, measure the resistance between the instrument cluster (IC) C220-11, circuit VMC30 (BU/GY), harness side and the rear video camera display mirror C9039-10, circuit VMC30 (BU/GY), harness side; and between the instrument cluster (IC) C220-11, circuit VMC30 (BU/GY), harness side and ground.
    • Is the resistance less than 5 ohms between the instrument cluster (IC) and the compass sensor module, and greater than 10,000 ohms between the instrument cluster (IC) and ground? 
    1. YES  : If equipped with stand alone compass module, INSTALL a new compass sensor module. If equipped with rear video camera display mirror, INSTALL a new rear video camera display mirror. REFER to REAR VIEW MIRRORS article. SET the zone. REFER to Compass Zone Adjustment - With Message Center  or Compass Zone Adjustment - Without Message Center . CALIBRATE the compass. REFER to Compass Calibration - With Message Center  or Compass Calibration - Without Message Center . CLEAR the DTCs. REPEAT the self-test.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
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