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

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

C1-C2:

C2-C4:

Normal Operation
The SJB communicates with the scan tool through the medium speed controller area network (MS-CAN), circuits 1827 (WH/LG) and 1828 (PK/LG). The SJB shares the MS-CAN with the instrument cluster and the electronic automatic temperature control (EATC) module. Power for the SJB is provided by circuit 1001 (WH/YE), and ground is provided by circuit 57 (BK).

Possible Causes
- Fuse
- Circuit 57 (BK) open
- Circuit 1001 (WH/YE) open
- Circuit 1827 (WH/LG) open (MS-CAN +)
- Circuit 1828 (PK/LG) open (MS-CAN -)
- SJB