| Table 1: | Heating and Air Conditioning |
| Table 2: | ECM 3.5L LZ4/3.6L LY7/LAT 2.4L |
| Table 3: | BCM |
Use the Scan Tool Data Display Values and Definitions 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 LED | Module and Display Data | On/Off | Varies |
A/C Request | HVAC System Data, Module and Display Data | Yes/No | Varies |
A/C Switch | Module and Display Data | Active/Inactive | Varies |
Ambient Air Temp. Sensor | HVAC System Data, Sensor Data, Actuator Data | °C/°F | Varies |
Auto Mode | HVAC and System Data | On/Off | Varies |
Battery Voltage Signal | HVAC and System Data | Volts | Varies |
Blower Motor Speed Command | HVAC System Data | % | Varies |
ECT | HVAC and System Data | °C/°F | Varies |
Engine speed RPM | HVAC and System Data | RPM | Varies |
Inside Air Temp. Sensor | HVAC System Data, Sensor Data, Actuator Data | °C/°F | Varies |
Lower Duct Air Temp. Sensor | Sensor Data | 0-255 | Varies |
Mode Dr. Motor Command | Actuator Data | 0-255 | Varies |
Mode Dr. Position | Actuator Data | 0-255 | Varies |
Mode Status | HVAC System Data | Def/Defog/Panel/Bi-level/Floor/ Auto | Varies |
Outside Air LED | Module and Display Data | On/Off | Varies |
Outside Air Mode Switch | Module and Display Data | On/Off | Varies |
Recirculation Dr. Motor Command | Actuator Data | 0-255 | Varies |
Recirculation Dr. Position | Actuator Data | 0-255 | Varies |
Recirculation LED | Module and Display Data | On/Off | Varies |
Recirculation Switch | Module and Display Data | Active/Inactive | Varies |
Sunload Sensor | Sensor Data | LUX Counts | Varies |
Temp. Dr. Motor Command | Actuator Data | 0-255 | Varies |
Temp. Dr. Position | Actuator Data | 0-255 | Varies |
Temp. Down Switch | Module and Display Data | Active/Inactive | Varies |
Temp. Up Switch | Module and Display Data | Active/Inactive | Varies |
Upper Duct Air Temp. Sensor | Sensor Data | 0-255 | Varies |
Vehicle Speed | HVAC and System Data | mph/km/h | mph |
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 Disengage Reason | Engine Data | None, System Voltage, WOT, CKP Learn Active, Engine Run Time, Coolant Hot, Anti Stall, A/C Pressure, Engine Speed, Trans Engine Spd, A/C Press Sensor, Low Voltage, High Voltage, Outside Air Temp, A/C Switched Off | None |
A/C Pressure Disable | Engine Data | Yes/No | No |
A/C High Side Pressure Sensor | Engine Data | kPa/psi | Varies |
A/C High Side Pressure Sensor | Engine Data | Volts | Varies |
A/C Off for WOT | Engine Data | Yes/No | Varies |
A/C Relay Circuit History | Engine Data | OK/Open/Short | OK |
A/C Relay Circuit Status | Engine Data | OK/Fault | OK |
A/C Relay Command | Engine Data | Yes/No | Varies |
A/C Request Signal | Engine Data | Yes/No | Varies |
FC Relay 1 Command | Engine Data | On/Off | Varies |
FC Relay 2 and 3 Command | Engine Data | On/Off | Varies |
ECT Sensor | Engine Data | °C/°F | Varies |
Ignition 1 Signal | Engine Data | Volts | 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 Request Switch | Inputs | On/Off | Varies |
