For 1990-2009 cars

Table 1: | Body Control Module (BCM)
Table 2: | Engine Control Module (ECM)

#### Body Control Module (BCM)

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 Data | Yes, No | Yes
Afterblow | HVAC Data | Active/Inactive/Requested/Pending | Varies
Ambient Air Temperature Sensor | HVAC Data | Volts | Varies
Blower Motor Relay Command | HVAC Data | On,Off | Varies

#### Engine Control Module (ECM)

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 History | HVAC Data | None/A/C pressure/Engine Speed/Battery Voltage/Anti Stall/RPM Unstable/WOT/Launch Perf/Coolant Hot | Varies
A/C High Side Pressure Sensor | HVAC Data | kPa, psi | Varies
A/C High Side Pressure Sensor | HVAC Data | Volts | Varies
A/C Off For WOT | HVAC Data | Yes, No | No
A/C Pressure Disable | HVAC Data | Yes, No | No
A/C Relay Circuit Status | HVAC Data | OK/Open/Short/Invalid State | OK
A/C Relay Command | HVAC Data | Yes, No | No
A/C Request Signal | HVAC Data | Yes, No | Yes
ECT Sensor | HVAC Data | °C/°F | Varies