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 3.4L (LA1)
Table 4: ECM Scan Tool Data List 3.6L (LY7)

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)

A/C Switch

Inputs

On/Off

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)

AC Request

Outputs

Yes/No

varies

Ambient Air Temp

Data

°C/°F

varies

Auto Mode

Outputs

On/Off

varies

Auto Button

Inputs

On/Off

varies

Blower Speed

Outputs

0 Thru 8 Bars

varies

Evaporator Temp

Data

°C/°F

varies

Fan Down Button

Inputs

On/Off

varies

Fan Up Button

Inputs

On/Off

varies

Front Defrost Button

Inputs

On/Off

varies

Inside Air Temperature

Data

°C/°F

varies

Left Temp Door Position

Outputs

Counts

varies

Mode Button

Inputs

On/Off

varies

Mode Door Position

Outputs

Vent/ Mix-Blend/ Floor/ Bi-Level/ Defrost

varies

Off Button

Inputs

On/Off

varies

Rear Defrost Button

Inputs

On/Off

varies

Recirculate Button

Inputs

On/Off

varies

Recirculation Mode

Outputs

Ambient Air/Recirculate

varies

Right Temp Door Position

Outputs

Counts

varies

Selected Air Mode

Outputs

Warm Up/Defrost/Off

varies

Sun Load Sensor

Data

Counts

varies

Vent Button

Inputs

On/Off

varies

PCM Scan Tool Data List 3.4L (LA1)

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 Off for WOT

Engine Data 2

Yes/No

varies

A/C Pressure Disable

Engine Data 2

Yes/No

varies

A/C High Side Pressure

Engine Data 2

kPa/Psi

varies

A/C High Side Pressure

Engine Data 2

Volts

varies

A/C Relay Command

Engine Data 2/ EGR Data/ Misfire Data

On/Off

varies

A/C Request Signal

Engine Data 2

Yes/No

varies

ECM Scan Tool Data List 3.6L (LY7)

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 Off for WOT

Cooling/HVAC Data

Yes/No

varies

A/C Pressure Disable

Cooling/HVAC Data

Yes/No

varies

A/C High Side Pressure

Cooling/HVAC Data

Volts

varies

A/C Relay Command

Cooling/HVAC Data

On/Off

varies

A/C Request Signal

Cooling/HVAC Data

Yes/No

varies