Test D: The Smart Junction Box (SJB) Does Not Respond to the Scan Tool

PINPOINT TEST D: THE SMART JUNCTION BOX (SJB) DOES NOT RESPOND TO THE SCAN TOOL

Normal Operation
The SJB communicates with the scan tool through the high speed controller area network (HS-CAN). Circuits VDB04 (WH/BU) (HS-CAN +) and VDB05 (WH) (HS-CAN -) provide the network connection to the SJB. The SJB shares the HS-CAN with the PCM, the restraints control module (RCM), the occupant classification system module (OCSM), the 4X4 control module, and the instrument cluster (IC). Voltage is supplied through circuit SBB05 (GY/RD), and ground is provided through circuit GD174 (BK/WH).

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

D1-D3:

D3-D4: