Symptom Chart

Condition	Possible Sources	Action
The PCM does not respond to the scan tool	Wiring, terminals or connectors PCM	REFER to the Introduction - Gasoline Engines article, Section 5, pinpoint test QA before proceeding to Pinpoint Test A. If pinpoint test QA has been completed, go to Pinpoint Test A .
The transmission control module (TCM) does not respond to the scan tool	Fuse Wiring, terminals or connectors TCM	Go to Pinpoint Test B .
The ABS module does not respond to the scan tool	Fuse Wiring, terminals or connectors ABS module	Go to Pinpoint Test C .
The restraints control module (RCM) does not respond to the scan tool	Fuse Wiring, terminals or connectors Case ground open RCM	Go to Pinpoint Test D .
The 4X4 control module does not respond to the scan tool	Fuse Wiring, terminals or connectors 4X4 control module	Go to Pinpoint Test E .
The vehicle dynamics module (VDM) does not respond to the scan tool	Fuse Wiring, terminals or connectors VDM	Go to Pinpoint Test F .
The instrument cluster (IC) does not respond to the scan tool	Fuse Wiring, terminals or connectors IC	Go to Pinpoint Test G .
The smart junction box (SJB) does not respond to the scan tool	Fuse Wiring, terminals or connectors SJB	Go to Pinpoint Test H .
The heating ventilation air conditioning (HVAC) module - electronic manual temperature control (EMTC) does not respond to the scan tool	Fuse Wiring, terminals or connectors HVAC module - EMTC	Go to Pinpoint Test I .
The heating ventilation air conditioning (HVAC) module - electronic automatic temperature control (EATC) does not respond to the scan tool	Fuse Wiring, terminals or connectors HVAC module - EATC	Go to Pinpoint Test J .
The audio control module (ACM) does not respond to the scan tool	Fuse Wiring, terminals or connectors ACM	Go to Pinpoint Test K .
The audio digital signal processing (DSP) module does not respond to the scan tool	Fuses Wiring, terminals or connectors DSP module	Go to Pinpoint Test L .
The satellite digital audio receiver system (SDARS) module does not respond to the scan tool	Fuse Wiring, terminals or connectors SDARS module	Go to Pinpoint Test M .
The audio rear control unit (RCU) does not respond to the scan tool	Fuse Wiring, terminals or connectors RCU	Go to Pinpoint Test N .
The rear entertainment module (RETM) does not respond to the scan tool	Fuse Wiring, terminals or connectors RETM	Go to Pinpoint Test O .
The driver seat module (DSM) does not respond to the scan tool	Fuse Wiring, terminals or connectors DSM	Go to Pinpoint Test P .
The dual climate controlled seat module (DCSM) does not respond to the scan tool	Fuse Wiring, terminals or connectors DCSM	Go to Pinpoint Test Q .
The power running board (PRB) module does not respond to the scan tool	Fuse Wiring, terminals or connectors PRB module	Go to Pinpoint Test R .
The parking aid module (PAM) does not respond to the scan tool	Fuse Wiring, terminals or connectors PAM	Go to Pinpoint Test S .
The liftgate/trunk module (LTM) does not respond to the scan tool	Fuses Wiring, terminals or connectors LTM	Go to Pinpoint Test T .
No medium speed controller area network (MS-CAN) communication, all modules are not responding	Wiring, terminals or connectors ACM DCSM (if equipped) DSM (if equipped) DSP module (if equipped) HVAC module - EATC (if equipped) HVAC module - EMTC (if equipped) IC LTM (if equipped) PAM (if equipped) PRB module (if equipped) RCU (if equipped) RETM (if equipped) SDARS module (if equipped) SJB	Go to Pinpoint Test U .
No high speed controller area network (HS-CAN) communication, all modules are not responding	Wiring, terminals or connectors ABS module IC PCM RCM TCM VDM (if equipped) 4X4 control module (if equipped)	Go to Pinpoint Test V .
No power to the scan tool	Fuse Wiring, terminals or connectors Scan tool	Go to Pinpoint Test W .
Intermittent no medium speed controller area network (MS-CAN) communication, one or more modules are not responding during network test	Wiring, terminals or connectors	Go to Pinpoint Test X .
Intermittent no high speed controller area network (HS-CAN) communication, one or more modules are not responding during network test	Wiring, terminals or connectors	Go to Pinpoint Test Y .