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, pinpoint test QA before proceeding to Pinpoint Test A. If pinpoint test QA has been completed, go to Pinpoint Test A .
The ABS module does not respond to the scan tool	Fuse Wiring, terminals or connectors ABS module	Go to Pinpoint Test B .
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 C .
The 4X4 control module does not respond to the scan tool	Fuse Wiring, terminals or connectors 4X4 control module	Go to Pinpoint Test D .
The occupant classification system module (OCSM) does not respond to the scan tool	Fuse Wiring, terminals or connectors OCSM	Go to Pinpoint Test E .
The headlamp control module (HCM) does not respond to the scan tool	Fuse Wiring, terminals or connectors HCM	Go to Pinpoint Test F .
The steering angle sensor module (SASM) does not respond to the scan tool	Fuse Wiring, terminals or connectors SASM	Go to Pinpoint Test G .
The instrument cluster (IC) does not respond to the scan tool	Fuse Wiring, terminals or connectors IC	Go to Pinpoint Test H .
The smart junction box (SJB) does not respond to the scan tool	Fuse Wiring, terminals or connectors SJB	Go to Pinpoint Test I .
The HVAC module does not respond to the scan tool	Fuse Wiring, terminals or connectors HVAC module	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	Fuse 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 rear entertainment module (RETM) does not respond to the scan tool	Fuse Wiring, terminals or connectors RETM	Go to Pinpoint Test N .
The driver seat module (DSM) does not respond to the scan tool	Fuse Wiring, terminals or connectors DSM	Go to Pinpoint Test O .
The dual climate control seat module (DCSM) does not respond to the scan tool	Fuse Wiring, terminals or connectors DCSM	Go to Pinpoint Test P .
The parking aid module (PAM) does not respond to the scan tool	Fuse Wiring, terminals or connectors PAM	Go to Pinpoint Test Q .
The liftgate/trunk module (LTM) does not respond to the scan tool	Fuse Wiring, terminals or connectors LTM	Go to Pinpoint Test R .
The accessory protocol interface module (APIM) does not respond to the scan tool	Fuse Wiring, terminals or connectors APIM	Go to Pinpoint Test S .
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 T .
No medium speed controller area network (MS-CAN) communication, all modules are not responding	Wiring, terminals or connectors ACM APIM SJB IC DSP module (if equipped) SDARS module (if equipped) DCSM (if equipped) RETM (if equipped) DSM (if equipped) HVAC module (if equipped) PAM (if equipped) LTM (if equipped)	Go to Pinpoint Test U .
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 V .
No high speed controller area network (HS-CAN) communication, all modules are not responding	Wiring, terminals or connectors PCM ABS module APIM RCM IC OCSM 4X4 control module (if equipped) HCM (if equipped) SASM (if equipped)	Go to Pinpoint Test W .
No power to the scan tool	Fuse Wiring, terminals or connectors Scan tool	Go to Pinpoint Test X .