Pinpoint Test 10: The Smart Junction Box (SJB) Does Not Respond To The Scan Tool

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PINPOINT TEST 10: THE SMART JUNCTION BOX (SJB) DOES NOT RESPOND TO THE SCAN TOOL - HYBRID

Normal Operation

The smart junction box (SJB) communicates with the scan tool through the medium speed controller area network (MS-CAN). Circuits (GY/O) (MS-CAN +) and (VT/O) (MS-CAN -) provide the network connection to the SJB. The SJB shares the MS-CAN network with the instrument cluster (IC), audio control module (ACM), HVAC module, satellite digital audio receiver system (SDARS) module, front controls interface module (FCIM) and front display interface module (FDIM). Voltage for the SJB is provided directly from the internal SJB bus bar through SJB fuse 5 (10A). Ground is provided by circuit (B/GY).

Possible Causes
- Fuse
- Wiring, terminals or connectors
- SJB

Diagnostic Procedure

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

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