Symptom Chart

Condition	Possible Sources	Action
The powertrain control module (PCM) does not respond to the scan tool	Circuitry 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 Circuitry TCM	Go to Pinpoint Test B .
The anti-lock brake system (ABS) module does not respond to the scan tool	Fuse Circuitry ABS module	Go to Pinpoint Test C .
The restraints control module (RCM) does not respond to the scan tool	Fuse Circuitry Case ground open RCM	Go to Pinpoint Test D .
The four wheel drive (4WD) control module does not respond to the scan tool	Fuse Circuitry 4WD control module	Go to Pinpoint Test E .
The air suspension module does not respond to the scan tool	Fuse Circuitry Air suspension module	Go to Pinpoint Test F .
The instrument cluster does not respond to the scan tool	Fuse Circuitry Instrument cluster	Go to Pinpoint Test G .
The smart junction box (SJB) does not respond to the scan tool	Fuse Circuitry SJB	Go to Pinpoint Test H .
The electronic manual temperature control module does not respond to the scan tool	Fuse Circuitry Electronic manual temperature control module	Go to Pinpoint Test I .
The electronic automatic temperature control (EATC) module does not respond to the scan tool	Fuse Circuitry EATC module	Go to Pinpoint Test J .
The audio unit does not respond to the scan tool	Fuse Circuitry Audio unit	Go to Pinpoint Test K .
The THX® amplifier does not respond to the scan tool	Fuse Circuitry THX® amplifier	Go to Pinpoint Test L .
The satellite radio receiver does not respond to the scan tool	Fuse Circuitry Satellite radio receiver	Go to Pinpoint Test M .
The auxiliary audio module does not respond to the scan tool	Fuse Circuitry Auxiliary audio module	Go to Pinpoint Test N .
The digital versatile disc (DVD) player does not respond to the scan tool	Fuse Circuitry DVD player	Go to Pinpoint Test O .
The driver seat module (DSM) does not respond to the scan tool	Fuse Circuitry DSM	Go to Pinpoint Test P .
The climate controlled seat module does not respond to the scan tool	Fuse Circuitry Climate controlled seat module	Go to Pinpoint Test Q .
The power running board module does not respond to the scan tool	Fuse Circuitry Power running board module	Go to Pinpoint Test R .
The parking aid module does not respond to the scan tool	Fuse Circuitry Parking aid module	Go to Pinpoint Test S .
The power liftgate module does not respond to the scan tool	Fuse Circuitry Power liftgate module	Go to Pinpoint Test T .
No medium speed controller area network (MS-CAN) communication, all modules are not responding	Circuitry Audio unit SJB Instrument cluster THX® amplifier (if equipped) Satellite radio receiver (if equipped) Climate controlled seat module (if equipped) Auxiliary audio module (if equipped) DVD player (if equipped) DSM (if equipped) Electronic manual temperature control module (if equipped) EATC module (if equipped) Parking aid module (if equipped) Power running board module (if equipped) Power liftgate module (if equipped)	Go to Pinpoint Test U .
No high speed controller area network (HS-CAN) communication, all modules are not responding	Circuitry PCM ABS module RCM Instrument cluster TCM Air suspension module (if equipped) 4WD control module (if equipped)	Go to Pinpoint Test V .
No power to the scan tool	Fuse Circuitry Scan tool	Go to Pinpoint Test W .