Symptom Troubleshooting Chart - Communications Network

SYMPTOM TROUBLESHOOTING CHART - COMMUNICATIONS NETWORK

Problem	Possible Cause	Action
The powertrain control module (PCM) does not respond to the scan tool, or no high speed controller area network (HS-CAN) communication	Fuse Circuitry PCM Restraints control module (RCM) Occupant classification sensor module Four wheel drive (4WD) control module Instrument cluster Smart junction box (SJB)	See PINPOINT TEST 5: NO CONTROLLER AREA NETWORK (CAN) COMMUNICATION , .
The anti-lock brake system (ABS) module does not respond to the scan tool	Fuse Circuitry ABS module	See PINPOINT TEST 3: ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DOES NOT RESPOND TO THE DIAGNOSTIC TOOL , .
The restraints control module (RCM) does not respond to the scan tool	Fuse Circuitry RCM	See PINPOINT TEST 2: RESTRAINTS CONTROL MODULE (RCM) DOES NOT RESPOND TO THE DIAGNOSTIC TOOL , .
The smart junction box (SJB) does not respond to the scan tool	Fuse Circuitry SJB	See PINPOINT TEST 1: SMART JUNCTION BOX (SJB) DOES NOT RESPOND TO THE DIAGNOSTIC TOOL , .
The instrument cluster does not respond to the scan tool	Fuse Circuitry Instrument cluster	See PINPOINT TEST 5: NO CONTROLLER AREA NETWORK (CAN) COMMUNICATION , .
The four wheel drive (4WD) control module does not respond to the scan tool	Fuse Circuitry 4WD control module	See PINPOINT TEST 4: FOUR-WHEEL DRIVE (4WD) CONTROL MODULE DOES NOT RESPOND TO THE DIAGNOSTIC TOOL , .
No high speed controller area network (HS-CAN) communication, all modules are not responding	Fuse Circuitry PCM RCM Occupant classification sensor module 4WD control module Instrument cluster SJB	See PINPOINT TEST 5: NO CONTROLLER AREA NETWORK (CAN) COMMUNICATION , .
No International Standards Organization (ISO) 9141 network communication	Circuitry ABS module	See PINPOINT TEST 6: NO INTERNATIONAL STANDARDS ORGANIZATION (ISO) 9141 COMMUNICATIONS NETWORK COMMUNICATION , .
No power to the scan tool	Fuse Circuitry Scan tool	See PINPOINT TEST 7: NO MODULE/NETWORK COMMUNICATION - NO POWER TO THE DIAGNOSTIC TOOL , .