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Pinpoint Test Am: The Compass Is Inoperative

WARNING: This page is about a different car, the 2008 Mercury Sable, 2008 Ford Taurus X, and 2008 Ford Taurus. 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.
  1. AM1 CARRY OUT THE INSTRUMENT CLUSTER (IC) SELF-TEST 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster (IC) Self-Test
    • Clear the instrument cluster (IC) DTCs.
    • Repeat the instrument cluster (IC) self-test.
    • Are any DTCs present? 
    1. YES  : For DTC B2097, INSTALL a new compass module. SET the compass zone. REFER to Compass Zone Adjustment . CALIBRATE the compass. REFER to Compass Calibration . TEST the system for normal operation.

      For DTC B2477, CARRY OUT the programmable module installation (PMI) for the instrument cluster (IC). REFER to MODULE CONFIGURATION article.

      For DTC U2013, go to  AM3.

    2. NO  : Go to  AM2.
  2. AM2 CHECK THE INSTRUMENT CLUSTER (IC) CONFIGURATION 
    • Enter the instrument cluster (IC) dealer test mode.
      • NOTE: The first value in the configuration display should be any of the following for a correctly configured compass: 2, 3, 6, 7, AS, B, E or F.
    • Scroll through the dealer test mode display until VOPS is displayed.
    • Does the first value match any of the values listed above? 
    1. YES  : Go to  AM3.
    2. NO  : CARRY OUT PMI for the instrument cluster (IC). REFER to MODULE CONFIGURATION article. TEST the system for normal operation.
  3. AM3 CHECK CIRCUIT CBP31 (BU/OG) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: Compass Module C909
    • Key in ON position.
    • Measure the voltage between the compass module C909-3, circuit CBP31 (BU/OG), harness side and ground.
      • Fig 1: Checking Circuit For Voltage
      GF0008209Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  AM4.
    2. NO  : VERIFY the SJB fuse 31 (10A) is OK. If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  4. AM4 CHECK CIRCUIT GD133 (BK) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between the compass module C909-4, circuit GD133 (BK), harness side and ground.
      • Fig 2: Checking Circuit For Open
      GF0008210Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  AM5.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  5. AM5 CHECK CIRCUIT VMC31 (YE/GN) AND VMC30 (BU/GY) FOR A SHORT TO VOLTAGE 
    • Disconnect: Instrument Cluster (IC) C220
    • Key in ON position.
    • Measure the voltage between the compass module C909-1, circuit VMC31 (YE/GN), harness side and ground; and between the compass module C909-2, circuit VMC30 (BU/GY), harness side and ground.
      • Fig 3: Measuring Voltage
      GF0046106Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : Go to  AM6.
  6. AM6 CHECK CIRCUIT VMC31 (YE/GN) FOR AN OPEN AND SHORT TO GROUND 
    • Key in OFF position.
    • Measure the resistance between the instrument cluster (IC) C220-10, circuit VMC31 (YE/GN), harness side and the compass 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 4: Measuring Resistance
      GF0023370Courtesy of FORD MOTOR CO.
    • 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  AM7.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  7. AM7 CHECK CIRCUIT VMC30 (BU/GY) FOR AN OPEN AND SHORT TO GROUND 
    • Measure the resistance between the instrument cluster (IC) C220-11, circuit VMC30 (BU/GY), harness side and the compass 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 5: Measuring Resistance
      GF0023371Courtesy of FORD MOTOR CO.
    • 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  : INSTALL a new compass module. SET the zone. REFER to Compass Zone Adjustment . CALIBRATE the compass. REFER to Compass Calibration . CLEAR the DTCs. REPEAT the self-test.

      If the compass is still inoperative, go to  AM8.

    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  8. AM8 CHECK FOR CORRECT INSTRUMENT CLUSTER (IC) OPERATION 
    • Disconnect the instrument cluster (IC) connector.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect the instrument cluster (IC) connector and make sure it seats correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new instrument cluster (IC). REFER to Instrument Cluster (IC) . TEST the system for normal operation.
    2. 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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