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Hummer H2. Manual - part 276

REDUCED VOLUME - ONE OR MORE SPEAKERS

Volume Down

Mute

Seek Up

Seek Down

Preset

Do the recorded values measure near the
specified values?

ohm

1180

ohm

9350

ohm

Go to Step 5

Go to Step 7

1. Turn OFF the ignition.

2. Disconnect the Body Control Module

connector with the Steering Wheel
Controls circuit.

3. Test the remote radio control signal

circuit for a short, high resistance or an
open.

Did you find and correct the condition?

Go to Step 10

Go to Step 6

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

Go to Step 10

Go to Step 9

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

Go to Step 10

Go to Step 8

Replace the appropriate SWC switch. Refer
to Steering Wheel Control Switch
Assembly Replacement in Steering Wheel
and Column.
Did you complete the replacement?

Go to Step 10

Replace the BCM. Refer to Body Control
Module Replacement in Body Control
System.
Did you complete the replacement?

Go to Step 10

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

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

Connector End Views Reference: Entertainment Connector End Views

Diagnostic System Check - Entertainment System

Always perform the Entertainment System Diagnostic System Check before proceeding with these diagnostic
procedures. Refer to Diagnostic System Check - Entertainment System .

Speakers - Reduced Volume

1. Speaker output circuit high resistance. Test the appropriate speaker output circuits for high resistance.

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

2. Low level audio circuit open. Test the appropriate low level audio circuit for an open. Refer to Circuit

Testing and Wiring Repairs in Wiring Systems.

3. Defective speaker - Replace the appropriate speaker. Refer to Speaker Replacement Reference .

SPEAKERS INOPERATIVE - ONE OR MORE

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

Preliminary Information

Perform the Diagnostic System Check - Entertainment System .

All Speakers Inoperative

IMPORTANT: The following information lists the most probable cause of the concern to the

least probable cause. If the list leads to the replacement of a component,
always inspect for a poor connection before proceeding with replacement.
Refer to Testing for Intermittent Conditions and Poor Connections and
Connector Repairs in Wiring Systems.

IMPORTANT: The following information lists the most probable cause of the concern to the

least probable cause followed by the appropriate test for that condition. If the
list leads to the replacement of a component, always inspect for a poor
connection before proceeding with the replacement. Refer to Circuit Testing
and Wiring Repairs in Wiring Systems.

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Entertainment - Hummer H2

With RPO UM8

1. Battery positive voltage circuit to the amplifier open. Test the battery positive voltage circuit to the

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

2. Ground circuit to the amplifier open. Test the ground circuit to the amplifier for an open. Refer to Circuit

Testing and Wiring Repairs in Wiring Systems.

3. Speaker output from the radio shorted. Test each speaker output of the radio for a short to ground or short

to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

4. No audio output from the amplifier. Replace the amplifier. Refer to Amplifier Replacement .

One Speaker Inoperative

Without RPO UM8

1. Speaker output circuit from amplifier open. Test the appropriate speaker output circuits for an open. Refer

to Circuit Testing and Wiring Repairs in Wiring Systems.

2. No audio output from the radio. Test for any AC voltage between the appropriate speaker output circuits

at the speaker harness connector, disconnected with the radio volume adjusted to 50 percent. If AC
voltage is present, replace the speaker. Refer to Speaker Replacement Reference . If no AC voltage is
present, replace the radio. Refer to Radio Replacement .

3. No audio output from the amplifier. Test for any AC voltage between the appropriate speaker output

circuits at the speaker harness connector, disconnected with the radio volume adjusted to 50 percent. If
AC voltage is present, replace the speaker. Refer to Speaker Replacement Reference . If no AC voltage
is present, replace the amplifier. Refer to Amplifier Replacement .

Speakers - One Channel Inoperative

1. Speaker output circuit from amplifier shorted. Test the appropriate speaker output circuits for a short to

ground or short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

2. Replace the amplifier. Refer to Amplifier Replacement .

IMPORTANT: The following information lists the most probable cause of the concern to the

least probable cause. If the list leads to the replacement of a component,
always inspect for a poor connection before proceeding with replacement.
Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

IMPORTANT: The radio must be programmed after replacement. Refer to Service

Programming System (SPS) in Vehicle Control Systems.

IMPORTANT: The following information lists the most probable cause of the concern to the

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Entertainment - Hummer H2

RADIO AUDIO INOPERATIVE AT REAR SEAT AUDIO (RSA) CONTROL

Radio Audio Inoperative at Rear Seat Audio (RSA) Control

RADIO SETUP (WITH RPO UM8)

The following service procedure requires programming or setup procedures to be performed on the radio.

Radio Replacement

Step

Action

Yes

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

Did you perform the Diagnostic System Check -
Entertainment System?

Go to Step 2

Go to Diagnostic

System Check -

Entertainment

System

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

2. Turn ON the radio.

3. Turn ON the rear seat audio (RSA)

controller.

4. Select the AM/FM push button on the rear

seat audio controller.

5. Connect headphones.

Does the rear seat audio operate normally?

Go to Testing for

Intermittent

Conditions and Poor

Connections in Wiring

Systems

Go to Step 3

Are both left and right audio channels inoperative
at the RSA?

Go to Step 5

Go to Step 4

Test the appropriate speaker input circuits of the
rear seat audio controller for a short, high
resistance, or an open. Refer to Circuit Testing
and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?

Go to Step 7

Go to Step 5

Inspect for poor connections at the harness
connector of the rear seat audio controller and the
radio. 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 7

Go to Step 6

Replace the rear seat audio controller. Refer to
Audio Control Replacement - Rear Seat
Did you complete the replacement?

Go to Step 7

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

System OK

Go to Step 2

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Entertainment - Hummer H2

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