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

WARNING: This page is about a different car, the 2010 Lincoln MKX and 2010 Ford Edge. 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.

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES .

D1 CHECK THE 4X4 CONTROL MODULE VOLTAGE SUPPLY CIRCUITS FOR AN OPEN
- Ignition OFF.
- Disconnect: 4X4 Control Module C281.
- Ignition ON.
- Measure the voltage between the 4X4 control module C281-5, circuit CBP35 (YE/GY), harness side and ground; and between the 4X4 control module C281-6, circuit SBP11 (BU/RD), harness side and ground.
  
  Fig 1: Measuring Voltage Between 4X4 Control Module C281-5, Circuit CBP35 (YE/GY) And Ground
  Courtesy of FORD MOTOR CO.
- Are the voltages greater than 10 volts?
- Yes: GO to D2 .
- No: VERIFY the Smart Junction Box (SJB) fuse 11 (10A) or fuse 35 (10A) is OK. If OK, REPAIR the circuit in question. If not OK, REFER to the SYSTEM WIRING DIAGRAMS for Edge or SYSTEM WIRING DIAGRAMS for MKX to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the network test with the scan tool.
D2 CHECK THE 4X4 CONTROL MODULE GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the 4X4 control module C280- 15, circuit GD140 (BK/GN), harness side and ground.
  
  Fig 2: Measuring Resistance Between 4X4 Control Module C280- 15, Circuit GD140 (BK/GN) And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes: GO to D3 .
- No: REPAIR the circuit. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
D3 CHECK THE HS-CAN CIRCUITS BETWEEN THE 4X4 CONTROL MODULE AND THE DLC FOR AN OPEN
- Measure the resistance between the 4X4 control module C281-4, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side.
  
  Fig 3: Measuring Resistance Between 4X4 Control Module C281-4, Circuit VDB04 (WH/BU) And DLC C251-6, Circuit VDB04 (WH/BU)
  Courtesy of FORD MOTOR CO.
- Measure the resistance between the 4X4 control module C281- 12, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side.
  
  Fig 4: Measuring Resistance Between 4X4 Control Module C281- 12, Circuit VDB05 (WH) And DLC C251-14, Circuit VDB05 (WH)
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
- Yes: CONNECT the negative battery cable. GO to D4 .
- No: REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
D4 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?
- Yes: INSTALL a new 4X4 control module. REFER to FOUR WHEEL DRIVE (4WD) SYSTEMS . CLEAR the DTCs. REPEAT the network test with the scan tool.
- 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.