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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 859 (Information Center (F250-F550)) >> Diagnostic Tests >> Information And Message Center >> Pinpoint Tests >> Pinpoint Test B: The Compass Is Inoperative >> Pinpoint Test B: The Compass Is Inoperative

Pinpoint Test B: The Compass Is Inoperative

WARNING: This page is about a different car, the 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 Ford Cab & Chassis. 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. B1 CHECK CIRCUIT 640 (RD/YE) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: Compass Sensor Module C909
    • Key in ON position.
    • Measure the voltage between the compass sensor module C909-2, circuit 640 (RD/YE), harness side and ground.
      Fig 1: Checking Circuit 640 (RD/YE) For Voltage
      GF0008209Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  B2.
    2. NO  : VERIFY the CJB fuse 45 (10A) is OK. REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  2. B2 CHECK CIRCUIT 676 (PK/OG) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between the compass sensor module C909-1, circuit 676 (PK/OG), harness side and ground.
      Fig 2: Checking Circuit 676 (PK/OG) For Open
      GF0008210Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  B3.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  3. B3 CHECK CIRCUIT 703 (WH/OG) FOR AN OPEN AND SHORT TO GROUND 
    • Disconnect: Instrument Cluster C220a
    • Measure the resistance between the compass sensor module C909-3, circuit 703 (WH/OG), harness side and the instrument cluster C220a-18, circuit 703 (WH/OG), harness side; and between the compass sensor module C909-3, circuit 703 (WH/OG), harness side and ground.
      Fig 3: Checking Circuit 703 (WH/OG) For Open And Short To Ground
      GF0008211Courtesy of FORD MOTOR CO.
    • Is the resistance 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  B4.
    2. NO  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  4. B4 CHECK CIRCUIT 702 (WH/BK) FOR AN OPEN AND SHORT TO GROUND 
    • Disconnect: Instrument Cluster C220a
    • Measure the resistance between the compass sensor module C909-4, circuit 702 (WH/BK), harness side and the instrument cluster C220a-19, circuit 702 (WH/BK), harness side; and between the compass sensor module C909-4, circuit 702 (WH/BK), harness side and ground.
      Fig 4: Checking Circuit 702 (WH/BK) For Open And Short To Ground
      GF0008212Courtesy of FORD MOTOR CO.
    • Is the resistance 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  in this article. CALIBRATE the compass. REFER to Compass Calibration  in this article. TEST the system for normal operation.
    2. NO  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
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