Hummer H2. Manual — part 1936
PCM Scan Tool Data List
SCAN TOOL DATA DEFINITIONS
A/C Switch
The scan tool displays On/Off. The scan tool displays On when the A/C request switch is active. The scan
tool displays Off when the A/C request switch is inactive.
AC Permission
The scan tool displays Withheld/Granted. The scan tool displays Granted when the HVAC control
module determines that conditions for compressor clutch engagement are present. The scan tool displays
Withheld when the HVAC control module determines that conditions for compressor clutch engagement
are not present.
AC Pressure Sensor
Mode Switch
Input/Output
On/Off
Off
Off Switch
Input/Output
On/Off
Off
Outside Air Temp. Filtered Input/Output
° C/° F
22-27° C (70-
80° F)
Outside Air Temp. Raw
Input/Output
° C/° F
Varies
Pressure Cycle Switch
Input/Output
Low Pressure, Normal
Varies
Rear Defrost Switch
Input/Output
On/Off
Off
Recirculate Switch
Input/Output
On/Off
Off
RH AC Duct Actual
Sensor Data
Counts
Varies
RH AC Duct Desired
Sensor Data
Counts
Varies
RH Heater Duct Actual
Sensor Data
Counts
Varies
RH Heater Duct Desired
Sensor Data
Counts
Varies
Right Mix Door Actual
Door
Positions
Counts
Varies
Right Mix Motor Drive
Door
Positions
Stop, Increase, Decrease
Stop
Right Temp. Setting
Input/Output
° C/° F
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 Pressure Sensor
Engine Data 2
kPa/Psi
629-845 kPa (85-120 psi)
A/C Pressure Sensor
Engine Data 2
Volts
Varies
A/C Relay Command
Engine Data 2
On/Off
Varies
A/C Request Signal
Engine Data 2
Yes/No
Varies
ECT Sensor
Engine Data 2
° C/° F
92° C (197° F)
2004 Hummer H2
2004 HVAC HVAC Systems - Automatic - Hummer H2
The scan tool displays 0-3450 kPa (0-500 psi). The voltage applied to the powertrain control module
(PCM) input from the A/C refrigerant pressure sensor is converted to a pressure value.
AC Pressure Sensor
The scan tool displays 0-5 volts. The voltage applied to the PCM input for the A/C refrigerant pressure
sensor.
A/C Relay Command
The scan tool displays On/Off. The scan tool displays the control decision for the compressor clutch relay
output as determined by the PCM.
A/C Request Signal
The scan tool displays Yes/No. The scan tool displays Yes when the PCM receives a class 2 message
from the HVAC control module to engage the A/C compressor clutch. The scan tool displays No when
the PCM receives a class 2 message from the HVAC control module to disengage the A/C compressor
clutch.
Air Inlet Door Commanded
The scan tool displays 0-255 counts. The scan tool displays the desired recirculation door position as
determined by the HVAC control module.
Air Inlet Door Actual
The scan tool displays 0-255 counts. The voltage applied to the recirculation door position input of the
HVAC control module is converted to a number between 0 and 255 where 51 Counts is approximately
equal to 1 V.
Air Inlet Motor Drive
The scan tool displays Stop, Increase, or Decrease. The scan tool displays the control decision for the
actuator output as determined by the HVAC control module.
Air Mix Door Left Commanded
The scan tool displays 0-255 counts. The scan tool displays the desired left air temperature door position
as determined by the HVAC control module.
Air Mix Door Right Commanded
The scan tool displays 0-255 counts. The scan tool displays the desired right air temperature door position
as determined by the HVAC control module.
2004 Hummer H2
2004 HVAC HVAC Systems - Automatic - Hummer H2
Auto Switch
The scan tool displays On/Off. The scan tool displays On when the automatic switch is active. The scan
tool displays Off when the automatic switch is inactive.
Battery Voltage
The scan tool displays 0-25 volts. The voltage measured from the battery positive voltage circuit and the
ground circuit of the HVAC control module.
Blower Motor PWM Speed
The scan tool displays 0-114%. The scan tool displays the control decision for the blower motor speed as
determined by the HVAC control module. The scan tool displays 114% when the blower motor is
commanded to maximum speed. The scan tool displays 0% when the blower motor is commanded OFF.
Dim Level Requested
The scan tool displays 0%-100%. This is the percentage of backlighting requested by the body control
module.
Engine Coolant Temp.
The scan tool displays -39 to 140° C (-38 to 284° F). This is the engine coolant temperature sent to the
HVAC control module by the PCM.
ECT Sensor
The scan tool displays -39 to 140° C (-38 to 284° F). The voltage applied to the PCM input from the
engine coolant temperature sensor is converted to a temperature value.
Fan Down Button
The scan tool displays On/Off. The scan tool displays On when the fan down switch is active. The scan
tool displays Off when the fan down switch is inactive.
Fan Up Button
The scan tool displays On/Off. The scan tool displays On when the fan up switch is active. The scan tool
displays Off when the fan up switch is inactive.
Front Defrost Switch
The scan tool displays On/Off. The scan tool displays On when the defrost switch is active. The scan tool
displays Off when the defrost switch is inactive.
2004 Hummer H2
2004 HVAC HVAC Systems - Automatic - Hummer H2
Ign. Since Current DTC
The scan tool displays 0-100 Cycles. The number of the ignition cycles since the setting of the most
recent current diagnostic trouble code (DTC).
Inside Air Temp Fan
The scan tool displays On/Off. The scan tool displays the control decision for the fan motor output as
determined by the HVAC control module. The fan motor is internal to the inside air temperature sensor
assembly.
Inside Air Temp.
The scan tool displays -40 to 215° C (-40 to 419° F). The voltage applied to the HVAC control module
input for the inside air temperature sensor is converted to a temperature value.
Left Mix Door Actual
The scan tool displays 0-255 counts. The voltage applied to the left air temperature door position input of
the HVAC control module is converted to a number between 0 and 255 where 51 Counts is
approximately equal to 1 V.
Left Mix Motor Drive
The scan tool displays Stop, Increase, or Decrease. The scan tool displays the control decision for the
actuator output as determined by the HVAC control module.
Left Solar Sensor
The scan tool displays 0-255 counts. The voltage applied to the left sunload input of the BCM is
converted to a number between 0 and 255 where 51 Counts is approximately equal to 1 V.
Left Temp. Setting
The scan tool displays 15 to 32° C (60 to 90° F). The scan tool displays the selected temperature from the
left air temperature switch.
LH AC Duct Actual
The scan tool displays 0-255 counts. The voltage applied to the left upper duct air temperature input of
the HVAC control module is converted to a number between 0 and 255 where 51 Counts is
approximately equal to 1 V.
LH AC Duct Desired
The scan tool displays 0-255 counts. The desired value of the left upper duct air temperature input. The
2004 Hummer H2
2004 HVAC HVAC Systems - Automatic - Hummer H2
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