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

WARNING: This page is about a different car, the 2008 Mercury Milan, 2008 Lincoln MKZ, and 2008 Ford Fusion. 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. E1 CHECK VOLTAGE TO THE 4X4 CONTROL MODULE 
    • Key in OFF position.
    • Disconnect: 4X4 Control Module C3253
    • Key in ON position.
      • Fig 1: Checking Voltage To 4X4 Control Module
      GF0025441Courtesy of FORD MOTOR CO.
    • Measure the voltage between the 4X4 control module C3253-5, circuit CBP19 (BN/WH), harness side and ground; and between the 4X4 control module C3253-6, circuit SBP15 (WH/RD), harness side and ground.
    • Are the voltages greater than 10 volts? 
    1. YES  : Go to  E2.
    2. NO  : VERIFY the smart junction box (SJB) fuse 20 (7.5A) or 28 (10A) is OK. If OK, REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
  2. E2 CHECK THE 4X4 CONTROL MODULE GROUND 
    • Key in OFF position.
      • Fig 2: Checking 4X4 Control Module Ground
      GF0025447Courtesy of FORD MOTOR CO.
    • Measure the resistance between the 4X4 control module C3253-15, circuit GD126 (BK/WH), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  E3.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
  3. E3 CHECK THE HS-CAN CIRCUITS BETWEEN THE 4X4 CONTROL MODULE AND THE DATA LINK CONNECTOR (DLC) FOR AN OPEN 
      Fig 3: Measuring Resistance Between 4WD Control Module C281-4, Circuit VDB04 (WH/BU) & DLC C251-6
      GF0032343Courtesy of FORD MOTOR CO.
    • Measure the resistance between the 4X4 control module C3253-4, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side.
      • Fig 4: Measuring Resistance Between 4WD Control Module C281-12, Circuit VDB05 (WH) & DLC C251-14
      GF0032344Courtesy of FORD MOTOR CO.
    • Measure the resistance between the 4X4 control module C3253-12, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  E4.
    2. NO  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
  4. E4 CHECK FOR CORRECT 4X4 CONTROL MODULE OPERATION 
    • Disconnect all the 4X4 control module connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the 4X4 control module connectors and make sure they seat 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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