The HVAC Scan Tool Data Definitions contains a brief description
of all HVAC related parameters available on the scan tool. The list is in
alphabetical order. A given parameter may appear in any one of the data lists.
In some cases, the parameter may appear more than once or in more than one
data list in order to group certain related parameters together.
A/C Compressor Cycling Switch: The scan tool displays Open or Closed. This parameter displays
the state of the A/C compressor cycling switch. The A/C compressor cycling
switch is a normally closed switch.
A/C Relay Command: The scan tool displays ON or OFF. This parameter displays the PCM
commanded state of the A/C clutch control relay. When the scan tool displays
ON, the A/C clutch should be engaged.
A/C Request Signal : The scan tool displays Yes or No. The PCM uses the A/C request
signal in order to determine if A/C compressor operation is being requested
by the BCM.
A/C Sec. High Press. Switch: The scan tool displays Open or Closed. This parameter displays
the state of the A/C secondary high pressure switch. The A/C secondary high
pressure switch is normally open.