Pinpoint Test D: The Smart Junction Box (SJB) Does Not Respond To The Scan Tool

WARNING: This page is about a different car, the 2007 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Use the correct probe adapter(s) when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

D1 CHECK SJB FUSE 11 FOR AN OPEN
- Disconnect: SJB Fuse 11
- Inspect the fuse for an open.
- Is the fuse open?
1. YES : Go to D4 .
2. NO : Go to D2 .
D2 CHECK CIRCUIT GD174 (BK/WH) FOR AN OPEN
- Key in OFF position.
- Disconnect: SJB C2280c
- Measure the resistance between the SJB C2280c-1, circuit GD174 (BK/WH), harness side and ground.
  
  Fig 1: Measuring Resistance Between SJB C2280c-1, GD174 (BK/WH), Harness Side & Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
1. YES : Go to D3 .
2. NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
D3 CHECK THE HS-CAN CIRCUITS BETWEEN THE DATA LINK CONNECTOR (DLC) AND THE SJB FOR AN OPEN
- Disconnect: SJB C2280d
- Measure the resistance between the SJB C2280d-20, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side.
  
  Fig 2: Measuring Resistance Between SJB C2280d-20, VDB04 (WH/BU) & DLC C251-6, VDB04 (WH/BU)
  Courtesy of FORD MOTOR CO.
- Measure the resistance between the SJB C2280d-21, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side.
  
  Fig 3: Measuring Resistance Between SJB C2280d-21, VDB05 (WH) & DLC C251-14, VDB05 (WH)
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
1. YES : Go to D4.
2. NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
D4 CHECK FOR CORRECT SJB OPERATION
- Disconnect all the SJB connectors.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect all the SJB 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 SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES 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.