Test F: The Smart Junction Box (SJB) Does Not Respond To The Diagnostic Tool

PINPOINT TEST F: THE SMART JUNCTION BOX (SJB) DOES NOT RESPOND TO THE DIAGNOSTIC TOOL

F1-F3:

Normal Operation
The SJB communicates with the diagnostic tool through the medium speed controller area network (CAN), circuits 1847 (WH/OG) and 1848 (PK/OG). Check circuits 1847 (WH/OG) and 1848 (PK/OG) between the SJB C2280b and the data link connector (DLC) C251.The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms there is an open in one of the medium speed CAN circuits, damage to the DLC C251, damage to the SJB connector, or damage to an in-line connector.

Possible Causes
- medium speed CAN circuit 1847 (WH/OG) open
- medium speed CAN circuit 1848 (PK/OG) open
- SJB C2280b
- SJB