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