Scan Tool Data List

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

HVAC Control Module Scan Tool Data List

Scan Tool Parameter	Data List	Units Displayed	Typical Data Value
Operating Conditions: Engine idling, A/C ON, ambient air temperature between 22-27°C (70-80°F)
A/C Switch	Input/Output	On, Off	Off
Mode Door Actual	Door Positions	Counts	Varies
Mode Door Commanded	Door Positions	Counts	Varies
Mode Motor Drive	Door Positions	Stop, Increase, Decrease	Stop
Air Inlet Motor Drive	Door Positions	Fresh Air, Recirc.	Varies
Air Mix Door Left Commanded	Door Positions	Counts	Varies
Air Mix Door Right Commanded	Door Positions	Counts	Varies
Battery Voltage	Input/Output	Volts	13.5-14.5 V
Blower Motor Status	Input/Output	Active, Inactive	Active
Ign. Since Current DTC	Input/Output	Numeric	0
Left Mix Door Actual	Door Positions	Counts	Varies
Left Mix Motor Drive	Door Positions	Stop, Increase, Decrease	Stop
Left Temp. Detent Pos.	Input/Output	0-18	Varies
Mode Select Position	Door Positions	Off, Auto, Defrost, Heater, Htr/Def, Bi-level, Panel	Varies
Pressure Cycle Switch	Input/Output	Low Pressure, Normal	Varies
Recirculate Switch	Input/Output	On, Off	Off
Right Mix Door Actual	Door Positions	Counts	Varies
Right Mix Motor Drive	Door Positions	Stop, Increase, Decrease	Stop
Right Temp Detent Pos.	Input/Output	0-18	Varies

PCM Scan Tool Data List

Scan Tool Parameter	Data List	Units Displayed	Typical Data Value
Operating Conditions: Engine idling, A/C ON, ambient air temperature between 22-27°C (70-80°F)
A/C Pressure Sensor	Engine Data 2	kPa, Psi	629-845 kPa (85-120 psi)
A/C Pressure Sensor	Engine Data 2	Volts	Varies
A/C Relay Command	Engine Data 2	On, Off	Varies
A/C Request Signal	Engine Data 2	Yes, No	Varies
ECT Sensor	Engine Data 2	°C/°F	92°C (197°F)
ECT Sensor	Engine Data 2	Volts	1.10-1.45 Volts