The Axxess ASWC-1 (Steering Wheel Control Interface) is a specialized device designed to restore functionality of steering wheel controls in vehicles with aftermarket audio systems. This guide draws from official documentation, firmware update notes, and verified user experiences to provide a clear, step-by-step overview of the installation, configuration, and troubleshooting processes for the ASWC-1. The device is programmable, compatible with multiple radio brands, and supports manual overrides when automatic detection fails.
This article is tailored for U.S. consumers and DIY enthusiasts who are installing an ASWC-1 in a vehicle equipped with an aftermarket head unit (HU). It outlines key technical considerations, including wiring specifics, firmware updates, and compatibility enhancements introduced in recent software revisions.
Overview of the Axxess ASWC-1
The Axxess ASWC-1 is a microcontroller-based interface that connects to the vehicle’s existing wiring harness and the aftermarket head unit. It is designed to bridge the gap between the vehicle’s factory steering wheel control signals and the aftermarket radio, ensuring that steering wheel buttons for volume, source, and other functions operate correctly.
Key features of the ASWC-1 include:
- Vehicle and radio type auto-detection
- Manual programming for custom setups
- Compatibility with over 20 radio brands and types
- Support for dual-assignment of steering wheel buttons
- USB-CAB or USB-MINI-CAB firmware updates
- Retains settings even after battery disconnect or interface removal
The ASWC-1 is updated regularly to expand compatibility and resolve known issues. These updates are delivered via the USB-CAB or USB-MINI-CAB tools and can be performed by users who are comfortable with basic diagnostic procedures.
Installation Process
The installation of the ASWC-1 involves connecting the device to the vehicle’s wiring harness and the head unit. The exact wiring configuration depends on the vehicle model and the type of head unit installed. Users must refer to the Axxess Vehicle Fit Guide for model-specific instructions.
General Wiring Principles
The ASWC-1 connects to the vehicle's steering wheel control circuitry via three main wires:
- Power (typically the Gray/Red wire) – This connects to the vehicle’s power supply and is essential for the interface to operate.
- Signal (typically the Gray/Blue wire) – This carries the control signals from the steering wheel to the interface.
- Ground (usually the Brown or Black wire) – A proper ground is crucial for the interface to function correctly.
In some vehicles, such as the 2010 Nissan 370Z Touring/Sport model, users have reported that the factory wiring diagram may conflict with the actual pinout, requiring manual adjustment. For example, one user found that connecting the Gray/Blue wire to pin 6 (White) and Gray/Red to pin 16 (Gray) produced the correct LED feedback, whereas the included instructions suggested the opposite.
LED Indicators and Feedback
The ASWC-1 provides visual feedback through its LED indicator. During installation, the LED flashes in sequences that correspond to detected components and system status:
- First flash sequence: Indicates the type of vehicle wire detected (e.g., Gray/Blue for certain models).
- Second flash sequence: Indicates the type of radio detected (e.g., JVC, Kenwood, Sony, etc.).
- Steady LED: Indicates a successful connection and stable operation.
In the case of the Kenwood 9960 head unit, a 12,000 ohm resistor must be temporarily placed in the circuit to enable detection. Once the interface recognizes the radio type, the resistor is removed to avoid interference with normal operation.
Ground and Power Connections
A solid ground connection is critical. In some installations, users have encountered intermittent functionality due to poor grounding. Always ensure the ground wire is connected to a clean, unpainted metal surface and secured tightly.
Power connections should be made to a switched power source, typically the same one used by the head unit. This ensures the ASWC-1 powers on and off with the vehicle.
Compatibility with Aftermarket Harnesses
Some users have used Axxess or third-party harnesses (such as the AHH-70-7552) to connect the ASWC-1 to the head unit. While these harnesses simplify installation, they can introduce resistance or signal degradation if not soldered properly. For best results, direct soldering of the ASWC-1 to the factory wiring is recommended for a more stable connection.
Programming the ASWC-1
Once the physical installation is complete, the ASWC-1 must be programmed to match the vehicle’s steering wheel and the head unit. The programming process can be automatic or manual, depending on the success of the auto-detection phase.
Automatic Programming
In most cases, the ASWC-1 will automatically detect the vehicle and head unit type and configure the appropriate control mappings. This is indicated by a series of LED flashes that confirm the system has successfully identified the components.
However, in some instances—particularly with non-standard or older head units—auto-detection may fail or misidentify the radio type. In such cases, manual programming is required.
Manual Programming
Manual programming involves pressing buttons on the steering wheel in a specific sequence to assign functions to each button. This process is outlined in the Axxess documentation and typically involves the following steps:
- Power off the vehicle and head unit.
- Hold the steering wheel button for a few seconds until the LED flashes.
- Use the steering wheel buttons to navigate through the programming menu and assign functions.
- Save the configuration and reboot the system.
Programming should be performed in a quiet environment to avoid signal interference. After programming, the ASWC-1 will retain the settings even after the vehicle is turned off or the battery is disconnected.
Firmware Updates and Recent Improvements
AXXESS regularly releases firmware updates for the ASWC-1 to expand compatibility and fix known issues. These updates are typically delivered through the USB-CAB or USB-MINI-CAB tools and can be applied in a matter of seconds.
Recent firmware updates have addressed a number of issues, including:
- Random commands when in reverse – Fixed for 2013–2017 Honda Accord models.
- SWC message fine-tuning – Improved for 2020 Ford vehicles.
- New radio detection – Added support for Slingshot, JVC, and Sony models.
- Enhanced manual override – Adjusted timing for BMW vehicles to prevent misfires.
- Dual-assignment feature – Allows steering wheel buttons to perform multiple functions.
- Bluetooth controls – Added support for Bluetooth microphones and hands-free calling.
For example, the update released on February 4, 2013, introduced the "dual assignment" feature, which enables users to assign multiple functions to a single steering wheel button. This is particularly useful for vehicles where the number of available buttons is limited.
Troubleshooting and Common Issues
Despite careful installation and programming, users may encounter issues with the ASWC-1. The following are some common problems and their potential solutions:
Intermittent Button Functionality
If certain buttons (e.g., Volume Down) work inconsistently, it may be due to a resistance issue in the wiring. This can occur when using third-party harnesses that introduce signal loss. To resolve this, users are advised to bypass the harness and solder the ASWC-1 directly to the factory wiring.
Incorrect Radio Detection
If the ASWC-1 detects the wrong radio type, it may misconfigure the control mappings. This can happen when the head unit is not in the system’s database. In such cases, users can manually override the radio type using the programming menu or by applying a firmware update that adds support for the specific model.
No LED Feedback
A lack of LED feedback typically indicates a power or ground issue. Check that the Gray/Red wire is connected to a switched power source and that the ground wire is connected to a solid metal surface. If the LED remains unlit, the interface may be faulty and should be replaced.
LED Flashes Indicate a Problem
The LED flash patterns can provide diagnostic information. For example, a rapid flash followed by a pause may indicate a problem with the head unit connection. If the LED flashes repeatedly without stabilizing, refer to the Axxess documentation for troubleshooting steps.
Compatibility and Supported Vehicles
The ASWC-1 is designed to work with a wide range of vehicle models and head units. The Axxess Vehicle Fit Guide provides a comprehensive list of supported applications, including:
- 2010–2019 Nissan 370Z models
- 2013–2017 Honda Accord
- 2015–2017 Ford Fusion
- 2016–2019 Chevy Cruze
- 2016–2019 Kia Sorrento
- 2016–2019 Honda HRV
- 2014–2019 Volkswagen models
- 2015–2019 Subaru Legacy
- 2015–2019 Maserati models
- 2012–2019 BMW models
The ASWC-1 is also compatible with a variety of head units, including models from Kenwood, JVC, Alpine, Sony, and Axxera. Each head unit may require a different configuration or resistor setup to ensure compatibility.
Legal and Patent Information
The ASWC-1 is protected by several U.S. patents, including:
- 8,214,105
- 8,014,920
- 8,285,446
- 8,527,147
These patents cover various aspects of the device’s operation, including signal detection, programming, and compatibility with multiple radio brands.
Conclusion
The Axxess ASWC-1 is a versatile and reliable solution for restoring steering wheel control functionality in vehicles with aftermarket audio systems. Its combination of automatic detection, manual programming, and firmware updates makes it suitable for a wide range of vehicles and head units. By following the installation and programming steps outlined in the official documentation and verified user experiences, users can ensure optimal performance and compatibility.
For best results, always use the latest firmware updates, ensure solid connections, and refer to the Vehicle Fit Guide for model-specific instructions. With proper installation and configuration, the ASWC-1 can significantly enhance the driving experience by making steering wheel controls fully functional with any compatible head unit.