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Home >> Mercury >> 2008 >> Milan Base, 2.3 Z, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1370 (Module Communications Network) >> Diagnostic Tests >> Communications Network >> Pinpoint Tests >> Pinpoint Test H: The Smart Junction Box (SJB) Does Not Respond To The Scan Tool >> Pinpoint Test H: The Smart Junction Box (SJB) Does Not Respond To The Scan Tool

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

WARNING: This page is about a different car, the 2009 Mercury Milan, 2009 Lincoln MKZ, and 2009 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. H1 CHECK THE SJB VOLTAGE SUPPLY CIRCUIT FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: SJB C2280a
    • Key in ON position.
      • Fig 1: Checking SJB Voltage Supply Circuit For An Open
      GF0026043Courtesy of FORD MOTOR CO.
    • Measure the voltage between the SJB C2280a-4, circuit SBB19 (BU/RD), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  H2.
    2. NO  : VERIFY the battery junction box (BJB) fuse 19 (40A) is OK. If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
  2. H2 CHECK THE SJB GROUND CIRCUIT FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: SJB C2280d
      • Fig 2: Checking SJB Ground Circuit GD116 (BK/VT) For An Open
      GF0030555Courtesy of FORD MOTOR CO.
    • Measure the resistance between the SJB C2280d-6, circuit GD116 (BK/VT), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  H3.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
  3. H3 CHECK THE MS-CAN CIRCUITS BETWEEN THE DATA LINK CONNECTOR (DLC) AND THE SJB FOR AN OPEN 
      Fig 3: Checking Medium Speed CAN Circuits Between DLC And SJB For Open (1 Of 2)
      GF0030556Courtesy of FORD MOTOR CO.
    • Measure the resistance between the SJB C2280d-17, circuit VDB06 (GY/OG) , harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side.
      • Fig 4: Checking Medium Speed CAN Circuits Between DLC And SJB For Open (2 Of 2)
      GF0030557Courtesy of FORD MOTOR CO.
    • Measure the resistance between the SJB C2280d-1, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  H4.
    2. NO  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
  4. H4 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.
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