Hummer H2. Manual - part 275

 

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Hummer H2. Manual - part 275

 

 

SPEED COMPENSATED VOLUME 

Speed Compensated Volume 

4

Replace the radio. Refer to Radio 
Replacement .Did you complete the 
replacement?

IMPORTANT:

Reprogram the radio. Refer to Service 
Programming System (SPS) in Vehicle 
Control Systems.

Go to Step 5

-

5

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

System OK

Go to Step 2

Step

Action

Yes

No

Schematic Reference: Radio/Audio System Schematics (non Class 2 Amplifier) or Radio/Audio 
System Schematics (Class 2 Amplifier) 
Definition: Volume will not compensate for road speed.

1

Did you perform the Diagnostic System Check - 
Entertainment?

Go to Step 2

Go to Diagnostic 

System Check - 

Entertainment 

System

2

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

2. Turn ON the radio.  

3. Turn ON the Speed Compensated Volume 

(SCV) control located on the radio.  

4. Perform a road test of the vehicle at various 

speeds in order to fully test the SCV. An 
operative SCV system will adjust the radio 
volume up as the vehicle speed is increased. 
Refer to Radio/Audio System Description 
and Operation for additional information.  

Does the system operate normally?

Go to Testing for 

Intermittent 

Conditions and Poor 

Connections in 

Wiring Systems

Go to Step 3

3

1. Turn OFF the ignition.  

2. Disconnect the radio.  

3. Test the vehicle speed signal circuit of the 

radio for an open. Refer to Circuit Testing 
and Wiring Repairs in Wiring Systems.  

Did you find and correct the condition?

Go to Step 6

Go to Step 4

Inspect for poor connections at the harness connector 
of the radio. Refer to Testing for Intermittent 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Entertainment - Hummer H2

  

NOISE COMPENSATED VOLUME INOPERATIVE 

Noise Compensated Volume Inoperative 

4

Conditions and Poor Connections and Connector 
Repairs in Wiring Systems. 
Did you find and correct the condition?

Go to Step 6

Go to Step 5

5

Replace the radio. Refer to Radio Replacement in 
Entertainment. 
Did you complete the replacement?

Go to Step 6

-

6

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

System OK

Go to Step 2

Step

Action

Value

Yes

No

Schematic Reference:Radio/Audio System Schematics (non Class 2 Amplifier) or Radio/Audio 
System Schematics (Class 2 Amplifier)

1

Did you perform the Diagnostic System 
Check - Entertainment System?

-

Go to Step 2

Go to Diagnostic 

System Check - 

Entertainment 

System

2

1. Turn ON the ignition, with the 

engine ON.  

2. Turn ON the blower motor on the 

maximum speed.  

3. Cycle the auto volume control ON 

and then OFF.  

Is a difference in volume heard?

-

Go to Testing for 

Intermittent 

Conditions and Poor 

Connections in Wiring 

Systems

Go to Step 3

3

1. Turn ON the ignition, with the 

engine OFF.  

2. Disconnect the noise compensation 

microphone.  

3. Measure the voltage from the noise 

compensation microphone supply 
voltage circuit to the drain wire.  

Does the voltage measure near the 
specified value?

8 V

Go to Step 4

Go to Step 5

4

Replace the noise compensation 
microphone. Refer to Microphone 
Replacement - Radio Volume 
Compensator Interior . 
Did you complete the replacement?

-

Go to Step 9

-

Test the noise compensation microphone 
supply voltage circuit for an open or short. 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Entertainment - Hummer H2

  

TAPE PLAYER WEAK, SLOW, OR GARBLED OUTPUT 

Tape Player Weak, Slow, or Garbled Output 

5

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

6

Test the drain wire circuit for an open or 
short. Refer to Circuit Testing and 
Wiring Repairs in Wiring Systems. 
Did you find and correct the condition?

-

Go to Step 9

Go to Step 7

7

Inspect for poor connections at the 
amplifier. 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

8

Replace the amplifier. Refer to Amplifier 
Replacement . 
Did you complete the repair?

-

Go to Step 9

-

9

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

-

System OK

Go to Step 3

Step

Action

Yes

No

Schematic Reference: Radio/Audio System Schematics (non Class 2 Amplifier) or Radio/Audio 
System Schematics (Class 2 Amplifier)

1

Did you perform the Diagnostic System Check - 
Entertainment System?

Go to 

Step 2

Go to Diagnostic System 

Check - Entertainment 

System

2

Use the J 39916-A CD and Cassette Diagnostic Audio Kit 
in order to perform the motor speed test. See Special 
Tools and Equipment . 
Is the cassette motor speed correct?

Go to 

Step 3

Go to Step 4

3

Use the J 39916-A CD in order to clean the cassette 
player. See Special Tools and Equipment . 
Did you complete the repair?

Go to 

Step 5

-

4

Replace the radio. Refer to Radio Replacement .Did you 
complete the repair?

IMPORTANT:

The radio must be programmed after replacement. 
Refer to Service Programming System (SPS) in 
Programming.

Go to 

Step 5

-

5

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 Entertainment - Hummer H2

  

STEERING WHEEL CONTROLS INOPERATIVE

Steering Wheel Controls Inoperative 

Step

Action

Value

(s)

Yes

No

Schematic Reference:Radio/Audio System Schematics (non Class 2 Amplifier) or Radio/Audio 
System Schematics (Class 2 Amplifier)

1

Did you perform the Diagnostic System 
Check - Entertainment System?

-

Go to Step 2

Go to Diagnostic 

System Check - 

Entertainment 

System

2

1. Turn ON the ignition, with the engine 

OFF.  

2. Operate the radio using the steering 

wheel controls (SWC).  

Does the radio operate normally with the 
steering wheel controls?

-

Go to Testing for 

Intermittent 

Conditions and Poor 

Connections in 

Wiring Systems

Go to Step 3

3

1. Disable the SIR. Refer to SIR 

Disabling and Enabling Zone 3 in 
SIR.  

2. Remove the SIR assembly to expose 

the SWC connector.  

3. Turn ON the ignition, with the engine 

OFF.  

4. Test the steering wheel controls 

voltage supply circuit of the SWC 
connector for an open.  

Did you find and correct the condition?

CAUTION:

Refer to SIR Caution in Cautions and 
Notices.

-

Go to Step 10

Go to Step 4

4

1. Turn OFF the ignition.  

2. Measure the resistance between the 

steering wheel controls voltage supply 
circuit and the remote radio control 
signal circuit of the SWC connector 
attached to the SWC switches.  

3. Depress the following steering controls 

and record the resistance values. 

z

Volume Up  

1270 

ohm

294 

ohm

823 

ohm

715 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Entertainment - Hummer H2

  

 

 

 

 

 

 

 

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