GM Service Manual Online
For 1990-2009 cars only

HVAC Scan Tool Data List

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition: ON, Engine: OFF

Outside Air Temp.

Primary ECC Data

Degrees

23°C (74°F)

Inside Air Temp.

Primary ECC Data

Degrees

23°C (74°F)

Upper Outlet Temp.

Primary ECC Data

Counts

Varies

Lower Outlet Temp.

Primary ECC Data

Counts

Varies

Solar Sensor

Primary ECC Data

Counts

Varies

Blower Motor PWM Speed

Primary ECC Data

Percent

50%

A/C Request

Primary ECC Data

NO/YES

NO

A/C LED On

Primary ECC Data

ON/OFF

ON

Recirc. LED

Primary ECC Data

ON/OFF

ON

Outside Air LED

Primary ECC Data

ON/OFF

ON

Rear Defog

Primary ECC Data

ON/OFF

ON

Mode Selection Position

Primary ECC Data

Bi-Level, Upper Outlets, Auto, Floor, Defog, Defrost

Floor

Mode Door Commanded

Primary ECC Data

Counts

Varies

Mode Door Actual

Primary ECC Data

Counts

Varies

Mode Door Max. Position

Primary ECC Data

Counts

Varies

Mode Door Min. Position

Primary ECC Data

Counts

Varies

Air Inlet Door Commanded

Primary ECC Data

Counts

Varies

Air Inlet Door Actual

Primary ECC Data

Counts

Varies

Max Air Inlet Dr Pos

Primary ECC Data

Counts

Varies

Min Air Inlet Dr Pos

Primary ECC Data

Counts

Varies

Air Mix Door Commanded

Primary ECC Data

Counts

Varies

Air Mix Door Actual

Primary ECC Data

Counts

Varies

Mix Door Max Position

Primary ECC Data

Counts

Varies

Mix Door Min Position

Primary ECC Data

Counts

Varies

Aux. Inside Air Temp.

Auxiliary ECC Data

Degrees

23°C (74°F)

Aux. Upper Outlet Temp.

Auxiliary ECC Data

Counts

Varies

Aux. Lower Outlet Temp.

Auxiliary ECC Data

Counts

Varies

Aux. Blower Motor PWM

Auxiliary ECC Data

Percent

50%

Aux. Mix Door Commanded

Auxiliary ECC Data

Counts

Varies

Aux. Mix Door Actual

Auxiliary ECC Data

Counts

Varies

Aux. Mix Door Max. Posi

Auxiliary ECC Data

Counts

Varies

Aux. Mix Door Min. Posi

Auxiliary ECC Data

Counts

Varies

Aux. Mode Door Commanded

Auxiliary ECC Data

Counts

Varies

Aux. Mode Door Actual

Auxiliary ECC Data

Counts

Varies

Aux. Mode Door Max. Pos

Auxiliary ECC Data

Counts

Varies

Aux. Mode Door Min. Pos

Auxiliary ECC Data

Counts

Varies