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General| Manufacturer | Audi |
|---|---|
| Model | A4 Avant |
| Year | 2004 |
| Category | Car Receiver |
| Cassette Player | No |
| Form Factor | Double DIN |
| Navigation | Optional |
| CD Player | Yes |
| MP3 Playback | Yes |
| Radio | AM/FM |
| External Amplifier | Optional |
| Radio Type | AM/FM |
| Display Type | LCD |
| Speaker Output | 4-channel |
| Bluetooth | Optional (often requires aftermarket adapter or higher trim level) |
| Power Output | 20W RMS per channel |
General precautions and safety steps before starting radio system repairs.
Requirement to obtain the anti-theft radio security code if necessary.
Procedure for safely disconnecting the vehicle battery before service.
Specific steps for vehicles equipped with Audi Telematics by OnStar.
Technicians must be familiar with system functions before troubleshooting or servicing.
Guidance on following specific radio installation instructions.
Reference to Repair Manual for detailed trim panel removal and installation.
Radio units have DTC memory to record malfunctions detected by the system.
Procedure to use VAS 5051 for guided fault finding related to OBD.
Location and removal/installation details for the CD changer unit.
Location and removal/installation details for the center loudspeaker.
Location and removal/installation details for the radio unit.
Location and removal/installation details for the CD changer unit.
Location and removal/installation details for the center loudspeaker.
Location and removal/installation details for the radio unit.
Location and removal/installation details for the CD changer unit.
Location and removal/installation details for the center loudspeaker.
Location and removal/installation details for the radio unit.
Location and removal/installation details for the CD changer unit.
Location and removal/installation details for the center loudspeaker.
Location and removal/installation details for the radio unit.
Layout and connection points for rear window antennas.
Layout and connection points for the antenna selection control module.
Layout and connection points for front bass speakers.
Layout and connection points for the antenna selection control module.
Layout and connection points for the left rear window antenna.
Layout and connection points for front bass speakers.
Terminal assignments for the 20-pin black multi-pin connector.
Terminal assignments for the 8-pin brown multi-pin connector.
Terminal assignments for the 8-pin black multi-pin connector.
Terminal assignments for the 10-pin red multi-pin connector.
Layout of rear window antennas for BOSE sound system.
Location of the BOSE power amplifier in the sedan.
Layout of front bass speakers for BOSE system.
Layout of the left antenna module for BOSE system in the Avant.
Location of the BOSE power amplifier in the Avant.
Layout of front bass speakers for BOSE system in the Avant.
Terminal assignments for the 25-pin connector of the BOSE amplifier.
Terminal assignments for the 32-pin connector of the BOSE amplifier.
Terminal assignments for the 8-pin connector A of the satellite radio.
Terminal assignments for the 8-pin connector B of the satellite radio.
Connection details for the satellite tuner antenna.
Required special tools and workshop equipment for radio unit removal/installation.
Step-by-step instructions for removing the "Concert II" radio unit.
Step-by-step instructions for installing the "Concert II" radio unit.
Required special tools and workshop equipment for radio unit removal/installation.
Step-by-step instructions for removing the "Symphony II" radio unit.
Step-by-step instructions for installing the "Symphony II" radio unit.
Required special tools and workshop equipment for CD changer unit removal/installation.
Step-by-step instructions for removing the CD changer unit.
Step-by-step instructions for installing the CD changer unit.
Indication on radio display when wiring between radio and CD changer is correct.
Indication on radio display when wiring is incorrect and troubleshooting steps.
Procedure for removing the satellite radio unit from the sedan.
Procedure for installing the satellite radio unit in the sedan.
Removal and installation of front midrange speakers.
Removal and installation of rear bass speakers.
Removal and installation of front bass speakers.
Required special tools and workshop equipment for midrange speaker removal/installation.
Step-by-step instructions for removing the front midrange speakers.
Step-by-step instructions for installing the front midrange speakers.
Procedure for removing the bass loudspeaker from the sedan.
Procedure for installing the bass loudspeaker in the sedan.
Procedure for removing the amplifier for rear loudspeakers in the sedan.
Procedure for installing the amplifier for rear loudspeakers in the sedan.
Procedure for removing the BOSE power amplifier in the sedan.
Procedure for installing the BOSE power amplifier in the sedan.
Procedure for removing the antenna selection control module in the sedan.
Procedure for installing the antenna selection control module in the sedan.
Procedure for removing the satellite tuner antenna in the sedan.
Procedure for installing the satellite tuner antenna in the sedan.
