| Table 1: | Heating and Air Conditioning Scan Tool Data List |
| Table 2: | ECM Scan Tool Data List |
| Table 3: | Vehicle Control Systems ECU Identification Information - HVAC |
Use the Scan Tool Data Display Values and Definitions Information in order to assist in diagnosing the HVAC control module concerns. Compare the vehicles actual scan tool data with the typical data display value table information. Use the data information in order to aid in understanding the nature of the concern when the vehicle does not match with the typical data display values.
The scan tool data values were taken from a known good vehicle under the following conditions:
| • | The ignition switch is in the ON position. |
| • | The engine is running at idle. |
| • | The vehicle is in PARK. |
| • | The doors are closed. |
| • | The windows are closed. |
| • | The A/C is ON. |
| • | The ambient air temperatures are at 22-27°C (70-80°F). |
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 Request | HVAC System Data, Module and Display Data | Yes/No | Yes |
Ambient Air Temp. Sensor | HVAC System Data, Sensor Data, Module and Display Data | °C/°F | Varies |
Blower Motor Speed | HVAC System Data | % | Varies |
Blower Motor Speed Command | HVAC System Data | % | Varies |
Compressor Clutch Status | HVAC System Data | OFF/Auto | Auto |
Driver Program Number | Module and Display Data | Counts | Varies |
Driver Temp. Dr. Cal. Range | Actuator Data | Pulses | Varies |
Driver Temp. Dr. Motor Command | Actuator Data | Counts | Varies |
Driver Temp. Dr. Position | Actuator Data | Counts | Varies |
Driver Temp. Dr. Position | Actuator Data | Pulses | Varies |
Inside Air Temp. Sensor | HVAC System Data, Sensor Data, Module and Display Data | °C/°F | Varies |
LED Intensity | Module and Display Data | Counts | Varies |
Left Sunload Sensor | Sensor Data | Counts | Varies |
Load Management Status | Module and Display Data | ON/OFF | OFF |
Lower Left Duct Temp. Sensor | Sensor Data | Counts | Varies |
Lower Right Duct Temp. Sensor | Sensor Data | Counts | Varies |
Mode Dr. Cal. Range | Actuator Data | Pulses | Varies |
Mode Dr. Motor Command | Actuator Data | Counts | Varies |
Mode Dr. Position | Actuator Data | Counts | Varies |
Mode Dr. Position | Actuator Data | Pulses | Varies |
Mode Status | HVAC System Data, Module and Display Data | Auto, Panel, Lower, Bi-level, Defog, Defrost, Off | Varies |
Psgr. Program Number | Module and Display Data | Counts | Varies |
Psgr. Temp. Dr. Cal. Range | Actuator Data | Pulses | Varies |
Psgr. Temp. Dr. Motor Command | Actuator Data | Counts | Varies |
Psgr. Temp. Dr. Position | Actuator Data | Counts | Varies |
Psgr. Temp. Dr. Position | Actuator Data | Pulses | Varies |
Recirculation Dr. Cal. Range | Actuator Data | Pulses | Varies |
Recirculation Dr. Motor Command | Actuator Data | Counts | Varies |
Recirculation Dr. Position | Actuator Data | Counts | Varies |
Recirculation Dr. Position | Actuator Data | Pulses | Varies |
Right Sunload Sensor | Sensor Data | Counts | Varies |
Upper Left Duct Temp. Sensor | Sensor Data | Counts | Varies |
Upper Right Duct Temp. Sensor | Sensor Data | Counts | Varies |
Valet Switch Status | Module and Display Data | Active/Inactive | OFF |
Vehicle Speed | HVAC System Data | Km/h/mph | Varies |
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 | ECM | Yes/No | No |
A/C Pressure Disabled | ECM | Yes/No | No |
A/C Refrigerant Pressure Sensor | ECM | kPa/psi | Varies |
A/C Refrigerant Pressure Sensor | ECM | Volts | Varies |
A/C Relay Command | ECM | Yes/No | Yes |
A/C Request Signal | ECM | Yes/No | Yes |
ECT Sensor | ECM, EVAP Data, Fuel Trim Data, Misfire Data, CMP Actuator Data | °C/°F | Varies |
Scan Tool Parameter | Data List | ID Number |
|---|---|---|
Operating Conditions: Ignition ON | ||
8-Digit GM Part Number | Module Information 1 | 8 Digit ID Number |
Calibration ID | Module Information 2 | 8 Digit ID Number |
Prom ID | Module Information 1 | 8 Digit ID Number |
Software Part Number | Module Information 2 | 8 Digit ID Number |
