F 350 4WD Super Duty V8-6.4L DSL Turbo (2008)
G3-G4
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
Normal Operation
The smart junction box (SJB) communicates with the scan tool through the medium speed controller area network (MS-CAN). Circuits VDB06
(GY/OG) (MS-CAN +) and VDB07 (VT/OG) (MS-CAN -) provide the network connection to the SJB. The SJB shares the MS-CAN network with
the instrument cluster, audio control module (ACM), electronic automatic temperature control (EATC) or electronic manual temperature control
(EMTC) module, satellite digital audio receiver system (SDARS) module (if equipped), driver seat module (DSM) (if equipped) and DVD player (if
equipped). Voltage for the SJB is provided directly from the internal SJB busbar through SJB fuse 5 (10A). Ground is provided by circuit GD179
(BK).
This pinpoint test is intended to diagnose the following:
-
Fuse
-
Wiring, terminals or connectors
-
SJB
