Symptom Troubleshooting Chart - Communications Network

COMMUNICATIONS NETWORK - TROUBLESHOOTING SYMPTOM

Problem	Possible Cause	Action
The smart junction box (SJB) does not respond to the diagnostic tool	Circuit or connection in the ISO 9141 network Battery Junction Box (BJB) F1 (50A) SJB	See MODULE DOES NOT RESPOND TO THE DIAGNOSTIC TOOL - SMART JUNCTION BOX (SJB) .
The restraints control module (RCM) does not respond to the diagnostic tool	Circuit or connection in the ISO 9141 network RCM	See MODULE DOES NOT RESPOND TO THE DIAGNOSTIC TOOL - RESTRAINT CONTROL MODULE (RCM) .
The anti-lock brake system (ABS) control module does not respond to the diagnostic tool	Circuit or connection in the ISO 9141 network ABS control module	See MODULE DOES NOT RESPOND TO THE DIAGNOSTIC TOOL - ANTI-LOCK BRAKE SYSTEM (ABS) .
The four wheel drive (4X4) control module does not respond to the diagnostic tool	Circuit or connection in the ISO 9141 network 4X4 control module	See MODULE DOES NOT RESPOND TO THE DIAGNOSTIC TOOL - FOUR-WHEEL DRIVE (4WD) .
No controller area network (CAN) communication	Circuit or connection in the CAN CAN networked module (instrument cluster only)	See NO MODULE/NETWORK COMMUNICATION - CONTROLLER AREA NETWORK (CAN) .
The instrument cluster does not respond to the diagnostic tool	Circuit or connection in the CAN Instrument cluster	See NO MODULE/NETWORK COMMUNICATION - CONTROLLER AREA NETWORK (CAN) .
The powertrain control module (PCM) does not respond to the diagnostic tool	Circuit or connection in the standard corporate protocol (SCP) network PCM	See NO MODULE/NETWORK COMMUNICATION - SCP LINK .
No standard corporate protocol (SCP) module/network communication	Circuit or connection in the SCP network SCP networked module (PCM only)	See NO MODULE/NETWORK COMMUNICATION - SCP LINK .
No international standards organization (ISO) 9141 network communication	Circuit or connection in ISO 9141 network ISO 9141 network modules	See NO MODULE/NETWORK COMMUNICATION - ISO 9141 NETWORK .
No module/network communication - no power to the diagnostic tool	Data link connector (DLC) Battery junction box (BJB) Jcase (50A) Smart junction box (SJB) Fuse 4 (20A) Circuitry Diagnostic tool	See NO MODULE/NETWORK COMMUNICATION - NO POWER TO THE DIAGNOSTIC TOOL .