Hummer H2. Manual — part 1949
Did you find and correct the condition?
Go to Step 31
Go to Step 26
19
Test the ground circuit of the inside air temperature
sensor for an open or high resistance. Refer to Circuit
Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 31
Go to Step 23
20
1. Turn OFF the ignition.
2. Disconnect the inside air temperature sensor
assembly.
3. Place the temperature probe of the J 43600 near
the inside air temperature sensor assembly.
4. Record the probe temperature.
5. Measure the resistance of the inside air temperature
sensor. Refer to Sensor Resistance Table .
Does the resistance measure within the specified range ?
Go to Step 22
Go to Step 23
21
Test the signal circuit and the low reference circuit of the
appropriate air temperature sensor for a high resistance.
Refer to Circuit Testing and Wiring Repairs in Wiring
Systems.
Did you find and correct the condition?
Go to Step 31
Go to Step 24
22
Test the signal circuit and the low reference circuit of the
inside air temperature sensor assembly for a high
resistance. Refer to Circuit Testing and Wiring Repairs
in Wiring Systems.
Did you find and correct the condition?
Go to Step 31
Go to Step 26
23
Inspect for poor connections at the harness connector of
the inside air temperature sensor assembly. Refer to
Testing for Intermittent Conditions and Poor
Connections and Connector Repairs in Wiring
Systems.
Did you find and correct the condition?
Go to Step 31
Go to Step 29
24
Inspect for poor connections at the harness connector of
the appropriate air temperature sensor. Refer to Testing
for Intermittent Conditions and Poor Connections and
Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 31
Go to Step 27
25
Inspect for poor connections at the harness connector of
the sunload sensor assembly. Refer to Testing for
Intermittent Conditions and Poor Connections and
Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 31
Go to Step 28
26
Inspect for poor connections at the harness connector of
the HVAC control module. Refer to Testing for
Intermittent Conditions and Poor Connections and
Connector Repairs in Wiring Systems.
2004 Hummer H2
2004 HVAC HVAC Systems - Automatic - Hummer H2
TOO COLD IN VEHICLE
Diagnostic Aids
z
The condition may be intermittent. Refer to Testing for Intermittent Conditions and Poor
Connections in Wiring Systems.
z
The air temperature actuators can be calibrated. Refer to Re-Calibrating Actuators .
Test Description
The numbers below refers to the step numbers in the diagnostic table.
8: This step ensures that the lower air temperature sensors operate properly. The LH and RH Heater Duct
Actual parameter count values should lower as the air temperature of the ducts get warmer. If there is a
high resistance in either of the air temperature sensors circuits or the sensor itself then the count value of
the effected sensor would remain high.
9: This step ensures that the upper air temperature sensors operate properly. The LH and RH AC Duct
Did you find and correct the condition?
Go to Step 31
Go to Step 30
27
Replace the appropriate air temperature sensor. Refer to
one of the following procedures:
z
Air Temperature Sensor Replacement - Upper
Right
z
Air Temperature Sensor Replacement - Upper
Left
z
Air Temperature Sensor Replacement - Lower
Left
z
Air Temperature Sensor Replacement - Lower
Right
Did you complete the replacement?
Go to Step 31
-
28
Replace the sunload sensor. Refer to Sun Load Sensor
Replacement .
Did you complete the replacement?
Go to Step 31
-
29
Replace the inside air temperature sensor assembly. Refer
to Inside Air Temperature Sensor Assembly
Replacement .
Did you complete the replacement?
Go to Step 31
-
30
Replace the HVAC control module. Refer to HVAC
Control Module Replacement .
Did you complete the replacement?
Go to Step 31
-
31
Operate the system in order to verify the repair.
Did you correct the condition?
System OK
Go to Step 3
2004 Hummer H2
2004 HVAC HVAC Systems - Automatic - Hummer H2
Actual parameter count values should lower as the air temperature of the ducts get warmer. If there is a
high resistance in either of the air temperature sensors circuits or the sensor itself then the count value of
the effected sensor would remain high.
15: Use the following table to determine that the recorded scan tool values are within range for the
recorded probe temperatures.
Too Cold in Vehicle
Too Cold in Vehicle
Temperature ° C
Temperature ° F
Scan Tool Display
0-4
32-40
206-175 counts
5-9
41-49
194-161 counts
10-14
50-58
180-145 counts
15-19
59-67
166-133 counts
20-24
68-76
150-119 counts
25-29
77-85
136-106 counts
30-34
86-94
121-93 counts
35-39
95-103
107-81 counts
40-44
104-112
94-69 counts
45-49
113-121
83-59 counts
50-54
122-130
72-51 counts
55-59
131-139
63-44 counts
60-64
140-148
55-37 counts
Step
Action
Values
Yes
No
Schematic Reference: HVAC Schematics
Connector End View Reference: HVAC Connector End Views
DEFINITION: The temperature can not be adjusted, or heating is insufficient.
1
Did you perform the HVAC Diagnostic System
Check?
-
Go to Step 2
Go to Diagnostic
System Check -
HVAC Systems -
Automatic
2
1. Recalibrate actuators. Refer to Re-
Calibrating Actuators .
2. Turn ON the ignition, with the engine OFF.
3. Observe the in Heating and Air
Conditioning.
IMPORTANT:
If during this diagnostic procedure the HVAC
control module is disconnected a recalibration
of actuators must be performed to avoid
misdiagnosis.
-
Go to
Diagnostic
2004 Hummer H2
2004 HVAC HVAC Systems - Automatic - Hummer H2
Does the scan tool display any DTC B0229,
B0414, B0424 or B3770?
Trouble Code
(DTC) List
Go to Step 3
3
1. Turn ON the ignition, with the engine OFF.
2. Turn ON the HVAC control module.
3. Place the mode switch in the PANEL
position.
4. Place the blower motor switch in each speed
position.
Does the blower motor operate in any of the speed
positions speed?
-
Go to Step 4
Go to Blower Motor
Inoperative
4
Does the blower motor operate in all desired speed
positions?
-
Go to Step 5
Go to Blower Motor
Malfunction
5
1. Place the recirculation switch in the ON
position.
2. Observe the recirculation door.
3. Place the recirculation switch in the OFF
position.
Does the recirculation door move from the
recirculation position to the outside air position?
-
Go to Step 6
Go to Air
Recirculation
Malfunction
6
1. Start the engine.
2. Place the A/C request switch in the ON
position.
3. Observe the A/C compressor clutch.
4. Place the A/C request switch in the OFF
position.
Does the A/C compressor clutch disengage?
-
Go to Step 7
Go to HVAC
Compressor Clutch
Does Not Disengage
7
Perform the Heating Performance Diagnostic.
Refer to Heating Performance Diagnostic .
Did you find and correct the condition?
-
Go to Step 29
Go to Step 08
8
1. Start the engine.
2. Wait until engine coolant temperature
reaches its normal operating temperature.
3. Place the mode switch to the Floor position.
4. Place the drivers air temperature switch to
the warmest position.
5. With a scan tool, observe the right and left
Heater Duct Actual and Heater Duct Desired
parameters.
-
2004 Hummer H2
2004 HVAC HVAC Systems - Automatic - Hummer H2
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