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 with the IC, the heating ventilation air conditioning (HVAC) module (if equipped), the audio control module (ACM), the satellite digital audio receiver system (SDARS) module (if equipped), the driver seat module (DSM) (if equipped), the parking aid module (PAM) (if equipped), the power running board (PRB) module (if equipped), and the rear entertainment module (RETM) (if equipped). Voltage for the SJB is provided by circuit SBB03 (BU/RD). Circuit GD108 (BK/VT) provides ground.

This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- SJB

H1:

H1-H3:

H4-H5: