Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 953 (ENTERTAINMENT SYSTEM)DESCRIPTION AND OPERATIONRADIO/AUDIO SYSTEM DESCRIPTION AND OPERATIONNOTES
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Radio/Audio System Description and Operation: Notes
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Notes
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The Entertainment System on this vehicle is configured with a radio, antenna, and speakers.
The following list shows the radios available for this vehicle:
- Radio (UM7) - AM/FM with Cassette
- Radio (UB0) - AM/FM with CD
- Radio (UB1) - AM/FM, Cassette and CD
- Radio (UC6) - AM/FM, Integral Multi Disc CD Changer
Radio 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 | ||
Cassette Features
| Controls | UM7 Radio | 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 | |
| Repeat | NA | |
Compact Disc Features
| Controls | UB0 Radio | 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 | ||
Each item in the list below represents topics covered in detail below.
- AM/FM Reception
- Voice Recorder (Travel Note)
- Audio Amplifier
- Theft Deterrent
- Integral Multi Disc CD Changer (IMDX)
- Remote Playback Device
- Radio Data System (RDS)
- Tape/CD Player Error Messages
- Rear Seat Audio (RSA)
- XM Satellite Radio
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.