GM Service Manual Online
For 1990-2009 cars only
Table 1: BCM Scan Tool Data List
Table 2: HVAC Control Module Scan Tool Data List
Table 3: PCM Scan Tool Data List

BCM 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)

Left Solar Sensor

Data

Counts

Varies

Right Solar Sensor

Data

Counts

Varies

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

AC Permission

Input/Output

Withheld, Granted

Varies

Air Inlet Door Actual

Door Positions

Counts

Varies

Air Inlet Door Commanded

Door Positions

Counts

Varies

Air Inlet Motor Drive

Door Positions

Stop, Increase, Decrease

Stop

Air Mix Door Left Commanded

Door Positions

Counts

Varies

Air Mix Door Right Commanded

Door Positions

Counts

Varies

Auto Switch

Input/Output

On, Off

Off

Battery Voltage

Input/Output

Volts

13.5-14.5 V

Blower Motor PWM Speed

Input/Output

Percent

12-114%

Dim Level Requested

Sensor Data

Percent

Varies

Engine Coolant Temp

Sensor Data

°C/°F

Varies

Fan Down Button

Input/Output

On, Off

Off

Fan Up Button

Input/Output

On, Off

Off

Front Defrost Switch

Input/Output

On, Off

Off

Ign. Since Current DTC

Input/Output

Numeric

0

Inside Air Temp.

Sensor Data

°C/°F

Varies

Inside Air Temp. Fan

Sensor Data

On, Off

On

Left Mix Door Actual

Door Positions

Counts

Varies

Left Mix Motor Drive

Door Positions

Stop, Increase, Decrease

Stop

Left Temp. Setting

Input/Output

°C/°F

Varies

LH AC Duct Actual

Sensor Data

Counts

Varies

LH AC Duct Desired

Sensor Data

Counts

Varies

LH Heater Duct Actual

Sensor Data

Counts

Varies

LH Heater Duct Desired

Sensor Data

Counts

Varies

Mode Select Position

Door Positions

Off, Auto, Defrost, Heater, Htr/Def, Bi-level, Panel

Varies

Mode Door Actual

Door Positions

Counts

Varies

Mode Dr. Motor Command

Door Positions

Counts

Varies

Mode Motor Drive

Door Positions

Stop, Increase, Decrease

Stop

Mode Switch

Input/Output

On, Off

Off

Off Switch

Input/Output

On, Off

Off

Outside Air Temp. Filtered

Input/Output

°C/°F

22-27°C (70-80°F)

Outside Air Temp. Raw

Input/Output

°C/°F

Varies

Pressure Cycle Switch

Input/Output

Low Pressure, Normal

Varies

Rear Defrost Switch

Input/Output

On, Off

Off

Recirculate Switch

Input/Output

On, Off

Off

RH AC Duct Actual

Sensor Data

Counts

Varies

RH AC Duct Desired

Sensor Data

Counts

Varies

RH Heater Duct Actual

Sensor Data

Counts

Varies

RH Heater Duct Desired

Sensor Data

Counts

Varies

Right Mix Door Actual

Door Positions

Counts

Varies

Right Mix Motor Drive

Door Positions

Stop, Increase, Decrease

Stop

Right Temp. Setting

Input/Output

°C/°F

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