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Pinpoint Test E: The Compass Is Inoperative

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.
  1. E1 CHECK CIRCUIT 1173 (BN/OG) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: Compass Sensor Module C909
    • Key in ON position.
      • Fig 1: Checking Circuit For Voltage
      GF0008209Courtesy of FORD MOTOR CO.
    • Measure the voltage between the compass sensor module C909-3, circuit 1173 (BN/OG), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  E2.
    2. NO  : VERIFY the smart junction box (SJB) fuse 11 (15A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
  2. E2 CHECK CIRCUIT 570 (BK/WH) FOR AN OPEN 
    • Key in OFF position.
      • Fig 2: Checking Circuit For Open
      GF0008210Courtesy of FORD MOTOR CO.
    • Measure the resistance between the compass sensor module C909-4, circuit 570 (BK/WH), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  E3.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  3. E3 CHECK CIRCUIT 702 (WH/BK) FOR AN OPEN AND SHORT TO GROUND 
    • Disconnect: Instrument Cluster C220
      • Fig 3: Checking Circuit For Open Or Short To Ground
      GF0025847Courtesy of FORD MOTOR CO.
    • Measure the resistance between the compass sensor module C909-1, circuit 702 (WH/BK), harness side and the instrument cluster C220-5, circuit 702 (WH/BK), harness side; and between the compass sensor module C909-1, circuit 702 (WH/BK), harness side and ground.
    • Are the resistances less than 5 ohms between the compass sensor module and the instrument cluster, and greater than 10,000 ohms between the compass sensor module and ground? 
    1. YES  : Go to  E4.
    2. NO  : REPAIR the circuit in question. TEST the system for normal operation.
  4. E4 CHECK CIRCUIT 703 (WH/OG) FOR AN OPEN AND SHORT TO GROUND 
      Fig 4: Checking Circuit For Open Or Short To Ground
      GF0025848Courtesy of FORD MOTOR CO.
    • Measure the resistance between the compass sensor module C909-2, circuit 703 (WH/OG), harness side and the instrument cluster C220-6, circuit 703 (WH/OG), harness side; and between the compass sensor module C909-2, circuit 703 (WH/OG), harness side and ground.
    • Are the resistances less than 5 ohms between the compass sensor module and the instrument cluster, and greater than 10,000 ohms between the compass sensor module and ground? 
    1. YES  : INSTALL a new compass sensor module. SET the zone. REFER to Compass Zone Adjustment . CALIBRATE the compass. REFER to Compass Calibration . TEST the system for normal operation.
    2. NO  : REPAIR the circuit in question. TEST the system for normal operation.
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