Pinpoint Test C: No Communication With The Smart Junction Box (SJB)

WARNING: This page is about a different car, the 2006 Mercury Milan, 2006 Lincoln Zephyr, and 2006 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

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

C1 CHECK THE SJB GROUND CIRCUIT
- Key in OFF position.
- Disconnect: SJB C2280d.
- Measure the resistance between the SJB C2280d-6, circuit GD116 (BK/VT), harness side and ground.
  
  Fig 1: Checking SJB Ground Circuit
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes : GO to C2.

No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.
C2 CHECK THE SJB VOLTAGE SUPPLY CIRCUIT SBB19 (BU/RD) FOR AN OPEN
- Disconnect: SJB C2280a.
- Key in ON position.
- Measure the voltage between the SJB C2280a-4, circuit SBB19 (BU/RD), harness side and ground.
  
  Fig 2: Checking SJB Voltage Supply Circuit SBB19 (BU/RD) For Open
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes : REFER to MODULE COMMUNICATIONS NETWORK to continue communication diagnosis.

No : VERIFY the BJB fuse 19 (40A) is OK. If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the data link diagnostics test.