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. Voltage for the SJB is provided by circuit SBB19 (BU/RD). Circuit GD116 (BK/VT) provides ground.

The SJB shares the MS-CAN with the following modules:
- Accessory protocol interface module (APIM) (if equipped)
- Audio control module (ACM)
- Audio digital signal processing (DSP) module (if equipped)
- Driver seat module (DSM) (if equipped)
- Driver door module (DDM) (if equipped)
- Dual climate control seat module (DCSM) (if equipped)
- Heating ventilation air conditioning (HVAC) module (if equipped)
- Instrument cluster (IC)
- Parking aid module (PAM) (if equipped)
- Satellite digital audio receiver system (SDARS) module (if equipped)

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

H1-H2:

H2-H3:

H4: