Symptom Chart

SYMPTOM CHART

Condition	Possible Sources	Action
The anti-lock brake system (ABS) module does not respond to the diagnostic tool	Circuit or connection in the ISO 9141 network.	GO to PINPOINT TEST A .
	ABS module.	GO to PINPOINT TEST A .
The restraint control module (RCM) does not respond to the diagnostic tool	Circuit or connection in the ISO 9141 network.	GO to PINPOINT TEST B .
	RCM.	GO to PINPOINT TEST B .
The message center does not respond to the diagnostic tool	Circuit or connection in the ISO 9141 network.	GO to PINPOINT TEST C .
The message center does not respond to the diagnostic tool	Message center.	GO to PINPOINT TEST C .
The 4-wheel drive (4WD) control module does not respond to the diagnostic tool	Circuit or connection in the 9141 ISO network.	GO to PINPOINT TEST D .
	4WD control module.	GO to PINPOINT TEST D .
The parking aid module does not respond to the diagnostic tool	Circuit or connection in the 9141 ISO network.	GO to PINPOINT TEST E .
	Parking aid module.	GO to PINPOINT TEST E .
The powertrain control module (PCM) does not respond to the diagnostic tool - 5.4L or 6.8L engine	Circuit or connection in the SCP network.	GO to PINPOINT TEST F .
	PCM.	GO to PINPOINT TEST F .
The powertrain control module (PCM) does not respond to the diagnostic tool - 6.0L diesel engine	Circuit or connection in the CAN network.	GO to PINPOINT TEST G .
	PCM.	GO to PINPOINT TEST G .
No powertrain control module (PCM) SCP network communication- 6.0L diesel engine	Circuit or connection in the SCP network.	GO to PINPOINT TEST H .
	PCM.	GO to PINPOINT TEST H .
The auxiliary powertrain control module (APCM) does not respond to the diagnostic tool - 6.0L diesel engine	Circuit or connection in the SCP network.	GO to PINPOINT TEST I .
	APCM.	GO to PINPOINT TEST I .
The passive anti-theft system (PATS) module does not respond to the diagnostic tool	Circuit or connection in the SCP network.	GO to PINPOINT TEST J .
	PATS module.	GO to PINPOINT TEST J .
The instrument cluster does not respond to the diagnostic tool	Circuit or connection in the SCP network.	GO to PINPOINT TEST K .
	Instrument cluster.	GO to PINPOINT TEST K .
No instrument cluster UBP network communication	Circuit or connection in the UBP network.	GO to PINPOINT TEST L .
No instrument cluster UBP network communication	Instrument cluster.	GO to PINPOINT TEST L .
The electronic automatic temperature control (EATC) module does not respond to the diagnostic tool	Circuit or connection in the UBP network.	GO to PINPOINT TEST M .
	EATC module.	GO to PINPOINT TEST M .
The driver seat module (DSM) does not respond to the diagnostic tool	Circuit or connection in the UBP network.	GO to PINPOINT TEST N .
	DSM.	GO to PINPOINT TEST N .
The vehicle security module does not respond to the diagnostic tool	Circuit or connection in the UBP network.	GO to PINPOINT TEST O .
	Vehicle security module.	GO to PINPOINT TEST O .
No international standards organization (ISO) 9141 network communication	Circuit or connection in the ISO 9141 network.	GO to PINPOINT TEST P .
	ISO network modules.	GO to PINPOINT TEST P .
No standard corporate protocol (SCP) network communication	Circuit or connection in the SCP network.	GO to PINPOINT TEST Q .
No standard corporate protocol (SCP) network communication	SCP network modules.	GO to PINPOINT TEST Q .
No universal asynchronous receiver-transmitter (UART) based protocol (UBP) network communication	Circuit or connection in the UBP network.	GO to PINPOINT TEST R .
	UBP network modules.	GO to PINPOINT TEST R .
No module/network communication - no response from the diagnostic tool	Data link connector (DLC).	GO to PINPOINT TEST S .
	Central junction box (CJB) fuse 3 (20A).
	Circuitry.
	Diagnostic tool.