GM Service Manual Online
For 1990-2009 cars only
Table 1: Body Control Module (BCM) Scan Tool Data List
Table 2: Engine Control Module (ECM) Scan Tool Data List

Body Control Module (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 Head Pressure

A/C Permission

Normal/Out of Range

Normal

Air Inlet Door Commanded

HVAC Door Positions

Counts

Varies

Ambient Air Temperature

A/C Permission

Normal/Out of Range

Normal

A/C LED

HVAC System Data

OFF/ON

Varies

A/C Request

HVAC System Data / Switch Inputs / A/C Permission

Yes/No

Yes

A/C Permission

HVAC System Data / A/C Permission

Granted/Withheld

Granted

A/C Sensor

Accessory

Volts

Varies

A/C Switch

Input

Inactive/Active

Varies

Battery Voltage

A/C Permission

Normal / Out of Range

Normal

Battery 1

Accessory

Volts

Varies

Blower Speed

A/C Permission

Normal / Off

Normal

Blower Motor Speed Command

HVAC System Data

%

Varies

Engine Coolant Temp

A/C Permission

Normal / Out of Range

Normal

Engine Running

A/C Permission

Yes / No

Varies

Ignition Cycles Since Last DTC

HVAC System Data

#

Varies

Low Pressure Switch

HVAC System Data

Open/Closed

Varies

Mode Door Actual

HVAC Door Positions

Counts

Varies

Mode Door Motor Commanded

HVAC Door Positions

Counts

Varies

Mode Switch Position

Inputs

Invalid, Auto, Panel, Bi-Level, Heater, Htr.-Def., Defrost

Auto

Outside Air LED

HVAC System Data

Off/On

Varies

Outside Air Mode Switch

Inputs

Active/Inactive

Varies

Recirculation LED

HVAC System Data

Off/On

Varies

Recirculation Switch

Inputs

Active/Inactive

Varies

Temperature Door Motor Command

HVAC Door Positions

Counts

Varies

Temperature Door Position

HVAC Door Positions

Counts

Varies

Engine Control Module (ECM) 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 Auto Recirc

HVAC Data

On/Off

Varies

A/C Compressor Cycling Switch

HVAC Data

Low Pressure/Normal

Varies

A/C Disengage

HVAC Data

None, A/C Pressure, Engine Speed, Batt Voltage, Anti Stall, RPM Unstable, WOT, Launch Perf., Coolant Hot

Varies

A/C Off for WOT

HVAC Data

Yes/No

Varies

A/C Pressure Disable

Engine Data

Yes/No

Varies

A/C Pressure Sensor

Engine Data

0 to 5 Volts

Varies

A/C High Side Pressure Sensor

Engine Data

kPa/Psi

0-3570 kPa (0-518 psi)

A/C High Side Pressure Switch

HVAC Data

High Pressure/Normal

Normal

A/C Relay Command

Engine Data

On/Off

On

A/C Request Signal

Engine Data

Yes/No

Yes

ECT

Engine Data

C/F

Varies

Ignition  1 Signal

Engine Data

Volts

Varies