Hummer H2. Manual - part 246

Did you find and correct the condition?

Go to Step 24

Systems

Test the automatic day-night signal circuit of the
driver outside rearview mirror element for an open or
short to ground. Refer to Circuit Testing and
Wiring Repairs in Wiring Systems.
Did you find or correct the condition?

Go to Step 24

Go to Step 15

Test the low reference circuit of the driver outside
rearview mirror element for an open or high
resistance. Refer to Circuit Testing and Wiring
Repairs in Wiring Systems.
Did you find or correct the condition?

Go to Step 24

Go to Step 15

Inspect for poor connections at the harness connector
of the inside rearview mirror. 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 24

Go to Step 21

Inspect for poor connections at the harness connector
of the DDM. Refer to Testing for Intermittent
Conditions and Poor Connections and Connector
Repairs in Wiring Systems.
Did you find or correct the condition?

Go to Step 24

Go to Step 22

Inspect for poor connections at the harness connector
of the driver outside rearview mirror. Refer to
Testing for Intermittent Conditions and Poor
Connections and Connector Repairs in Wiring
Systems.
Did you find or correct the condition?

Go to Step 24

Go to Step 23

Repair an open or high resistance in the ground
circuit of the inside rearview mirror. Refer to Wiring
Repairs in Wiring Systems.
Did you complete the repair?

Go to Step 24

Repair an open or short to ground in the ignition
voltage circuit of the inside rearview mirror. Refer to
Wiring Repairs in Wiring Systems.
Did you complete the repair?

Go to Step 24

1. Repair a short to voltage on the automatic day-

night signal circuit of the driver outside

IMPORTANT:

A short to voltage on the automatic day-night
signal circuit of the driver outside rearview mirror
element will cause permanent damage to the
driver outside rearview mirror and the inside
rearview mirror. Both mirrors will have to
replaced. The following actions will need to be
performed:

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Stationary Windows - Hummer H2

MIRRORS - TEMPERATURE DISPLAY INACCURATE

Diagnostic Aids

An inaccurate temperature display indicates an abnormal resistance condition within the system.

For intermittent diagnosis, refer to Testing for Intermittent Conditions and Poor Connections in
Wiring Systems.

The following table will be used to measure the resistance of the sensor and compare it with the actual ambient
temperature. The mirror's temperature accuracy should be within 5 degrees of the actual temperature. The actual
temperature should not be taken from a radio station, a sign displaying the temperature, etc. A temperature
measuring tool such as a thermometer should be used. Some temperature measuring tools may be within 5
degrees of the actual temperature. Make sure to consult the manufacturer for the accuracy of the tool. This

rearview mirror element. Refer to Wiring
Repairs in Wiring Systems.

2. Replace the inside rearview mirror and the

driver outside rearview mirror. Refer to the
following:

Mirror Replacement in Doors

Rearview Mirror Replacement

Did you complete the repair?

IMPORTANT:

Perform the Compass Calibration and
Variance Procedure for the inside rearview
mirror with compass.

Go to Step 24

Replace the inside rearview mirror. Refer to
Rearview Mirror Replacement .Did you complete
the replacement?

IMPORTANT:

Perform the Compass Calibration and Variance
Procedure for the inside rearview mirror with
compass.

Go to Step 24

Replace the DDM. Refer to Switch Replacement -
Door Lock and Side Window - Driver .
Is the replacement complete?

Go to Step 24

Replace the driver outside rearview mirror. Refer to
Mirror Replacement .
Did you complete the replacement?

Go to Step 24

Operate the system in order to verify the repair.
Did you correct the condition?

System OK

Go to Step 2

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Stationary Windows - Hummer H2

comparison can make the mirror seem off by 5-10 degrees of the actual temperature when it is not.

Ambient Air Temperature Sensor Resistance

Mirrors - Temperature Display Inaccurate

°C

°F

Minimum Resistance

K Ohms

Maximum Resistance

K Ohms

-35

-31

234.81

250.59

-30

-22

171.69

182.31

-25

-13

126.82

133.99

-20

-4

94.63

99.49

-15

71.30

74.58

-10

54.21

56.43

-5

41.48

43.17

32.00

33.31

24.96

25.83

19.61

20.19

15.49

15.94

12.31

12.67

9.85

10.12

7.96

8.15

6.45

6.61

104

5.27

5.39

113

4.32

4.42

122

3.56

3.64

131

2.95

3.02

140

2.46

2.52

Step

Action

Yes

Schematic Reference:Inside Rearview Mirror Schematics
Connector End View Reference:Stationary Windows Connector End Views

Did you review the Automatic Day-Night Mirror Description and
Operation?

Go to

Step 2

Go to Automatic Day-

Night Mirror

Description and

Operation

1. Disconnect the ambient temperature sensor connector.

2. Connect the J 33431-C Signal Generator and Instrument

Panel Tester between the signal circuit of the ambient
temperature sensor and the ground circuit of the ambient
temperature sensor at the sensor wire harness connector.

3. Turn ON the ignition, with the engine OFF.

IMPORTANT:

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Stationary Windows - Hummer H2

MIRRORS - TEMPERATURE DISPLAYS SC OR OC

4. Vary the resistance on the J 33431-C from 250 K ohm-

2.52 K ohm.

5. Refer to the ambient air temperature resistance chart above

to convert from resistance to temperature display.

Does the mirror display the correct temperature?

Verify the J 33431-C resistance settings with a DMM.
Disconnect one of the J 33431-C leads momentarily
between the resistance settings in order to quickly
update the temperature display.

Go to

Step 5

Go to Step 3

Test the signal circuit of the ambient 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 9

Go to Step 4

Test the ground circuit of the ambient 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 9

Go to Step 6

Inspect for poor connections at the harness connector of the
ambient 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 9

Go to Step 7

Inspect for poor connections at the harness connector of the
inside rearview mirror. 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 9

Go to Step 8

Replace the ambient temperature sensor. Refer to Ambient Air
Temperature Sensor Replacement .
Did you complete the replacement?

Go to

Step 9

Replace the inside rearview mirror. Refer to Rearview Mirror
Replacement .
Did you complete the replacement?

Go to

Step 9

Operate the system in order to verify the repair.
Did you correct the condition?

System

Go to Step 2

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Stationary Windows - Hummer H2

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