Hummer H2. Manual - part 287

Fig. 49: Rear Quarter Speaker 
Courtesy of GENERAL MOTORS CORP. 

3. Make the electrical connection to the speaker harness.  

4. Install the rear quarter panel to the body. Refer to Trim Panel Replacement - Right Body Side or Trim 

Panel Replacement - Left Body Side in Interior Trim.  

5. Check speaker for operation.  

DESCRIPTION AND OPERATION

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Entertainment - Hummer H2

  

RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION

The Entertainment System on this vehicle is configured with a radio, antenna, and speakers. 

The following list shows the radios available for this vehicle: 

z

Radio (UB1) - AM/FM, Cassette and CD  

z

Radio (UC6) - AM/FM, Integral Multi Disc CD Changer  

z

Navigation Radio (UM8)- AM/FM, CD, Navigation  

Radio Features 

Cassette Features 

Controls

All Radios

Power

Push PWR/PUSH/VOL knob to turn the radio on.

Volume

The volume is adjusted by rotating the PWR/PUSH/VOL knob.

Automatic 

Volume 

Control

Press the AUTOVOL Button

Tune

Turn the TUNE/SELECT/PUSH RCL knob

Seek

Momentarily press SEEK/SCAN button

Scan

Hold SEEK/SCAN button at least 4 seconds

Presets

Six AM, Six FM1 and Six FM2

Preset Saving

Press and hold desired button until an audible beep is heard

Set Clock

Press and hold the HR or MN button until an audible beep indicates the time set mode 

has been entered. Once the beep is heard, the time can be set by tapping each button to 

incrementally adjust the time. Holding down each button will rapidly change the time.

Recall

Push the TUNE/SELECT/PUSH RCL knob

Fade or 

Balance

Press BAL/FADE button to select and adjust w/SELECT knob

Bass, Treble or 

Midrange

Press TONE button to select and adjust w/SELECT knob

Automatic 

Tone

Press AUTO TONE Button

Controls

UB1 Radio

Eject

EJECT button

Fast Forward

Preset button 1

Reverse

Preset button 4

Auto Reverse

Yes

Side

Preset button 5

Previous

Preset button 1

Next

Preset button 2

Dolby

Preset button 6

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Entertainment - Hummer H2

  

Compact Disc Features 

Each item in the list below represents topics covered in detail below. 

z

AM/FM Reception  

z

Voice Recorder (Travel Note)  

z

Audio Amplifier  

z

Theft Deterrent  

z

Integral Multi Disc CD Changer (IMDX)  

z

Remote Playback Device  

z

Radio Data System (RDS)  

z

Tape/CD Player Error Messages  

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Rear Seat Audio (RSA)  

z

XM Satellite Radio  

AM/FM Reception 

Radio Signal 

The radio signal is sent from a broadcast station and is then received by an antenna. The strength of the signal 
received depends on the following: 

z

The power output (wattage) of the broadcasting station  

z

The location of the vehicle (or receiver) relative to the broadcast tower.  

z

Obstacles between the tower and the receiver  

z

Atmospheric conditions  

z

What band (AM or FM) the station is broadcasting  

z

Type of antenna and the ground plane 

Repeat

NA

Controls

UB1 Radio

UC6 Radio

Eject

EJECT button

Fast Forward

Preset button 1

Reverse

Preset button 4

Disc

Preset button 5

Previous

Preset button 1

Next

Preset button 2

Dolby

Preset button 6

Repeat

NA

Random

Preset button 6

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Entertainment - Hummer H2

  

AM Reception 

The AM band has a lower frequency range than the FM band. These longer wavelengths: 

z

Bend around Obstacles  

z

Follow the curvature of the earth  

z

May reflect off the ionosphere (skip)  

The AM frequencies have longer range due to the ground wave. The ground wave follows the curvature of the 
earth and is effected by its conductivity. Greater conductivity equates to less signal loss thus transmission over 
water is better than over land. The AM band has a range of 80-320 km (50-200 miles). 

FM Reception 

The shorter wavelengths of the higher frequency FM band: 

z

Reflect off obstacles  

z

Are absorbed by the ground  

z

Penetrate the ionosphere  

Broadcasts in the FM band are limited to line of sight reception which is typically 40 km (25 mi). Even when 
out of a direct line of sight, the signal may be reflected into areas that would be in a shadow otherwise. Factors 
which affect the line of sight include: 

z

Height of the broadcast antenna  

z

Height of the receiving antenna  

z

Terrain and buildings in the broadcast path  

Audio Amplifier 

The radio supplies low level audio signals to the audio amplifier in order to boost the signal sent to the speakers. 
The class 2 signal circuit allows the radio to recognize that an amplifier is present. Once the radio detects an 
audio amplifier, it will output low level audio signals. The audio amplifier is turned on when it receives a 
message via the class 2 serial data circuit indicating that the radio is on. The audio amplifier can also be a Non-
Class 2 Bose amp, which was a mid year change in 2004 MY. Ensure which amplifier is installed in the vehicle.

Auto Volume Control and Speed Compensated Volume 

Auto volume control is available with the Class 2 audio amplifiers. This utilizes a noise compensation 
microphone the provides the amplifier with a sample of the ambient noise within the vehicle. If the noise level 
is high the amplifier will adjust the volume accordingly. 

Speed compensated volume uses the vehicle speed provided to the amplifier, to adjust the volume, to 
compensate for the increase in road and wind noise associated with increased speed. This option is only 
available with the Non-Class 2 Bose Amplifier.

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Entertainment - Hummer H2