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Pinpoint Test C: The 4X4 Control Module Does Not Respond To The Scan Tool

WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. 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. C1 CHECK THE 4X4 CONTROL MODULE VOLTAGE SUPPLY CIRCUITS FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: 4X4 Control Module C3184
    • Key in ON position.
    • Measure the voltage between the 4X4 control module C3184-4, circuit CBP35 (YE/GY), harness side and ground; and between the 4X4 control module C3184-5, circuit SBP11 (BU/RD), harness side and ground.
      • Fig 1: Measuring Voltage
      GF0042739Courtesy of FORD MOTOR CO.
    • Are the voltages greater than 10 volts? 
    1. YES  : Go to  C2.
    2. NO  : VERIFY the smart junction box (SJB) fuse 11 (10A) and 35 (10A) are OK. If OK, REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
  2. C2 CHECK THE 4X4 CONTROL MODULE GROUND CIRCUIT 
    • Key in OFF position.
    • Measure the resistance between the 4X4 control module C3184-15, circuit GD182 (BK/GY), harness side and ground.
      • Fig 2: Checking Circuit For Open
      GF0025447Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  C3.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
  3. C3 CHECK THE HS-CAN CIRCUITS BETWEEN THE 4X4 CONTROL MODULE AND THE DATA LINK CONNECTOR (DLC) FOR AN OPEN 
    • Measure the resistance between the 4X4 control module C3184-3, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side; and between the 4X4 control module C3184-11, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side.
      • Fig 3: Measuring Resistance
      GF0042740Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  C4.
    2. NO  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
  4. C4 CHECK FOR CORRECT 4X4 CONTROL MODULE OPERATION 
    • Disconnect the 4X4 control module connector.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect the 4X4 control module 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 4X4 control module. REFER to FOUR WHEEL DRIVE (4WD) SYSTEMS article. CLEAR the DTCs. REPEAT the network test with the scan tool.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.
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