1. Introduction
The PAC AmpPRO 4 AP4-FD31 is an advanced amplifier integration interface designed for select Ford vehicles from 2018 and up, specifically those equipped with factory-amplified B&O A2B sound systems. This interface simplifies the process of upgrading vehicle audio systems by allowing the installation of aftermarket amplifiers while retaining the original radio's functionality, fit, and features.
The AmpPRO 4 module ensures that all audio from other vehicle features, such as factory Bluetooth and warning chimes, is retained. It includes a sub-level controller and provides an optical output for enhanced audio performance.
2. Compatibility
The AP4-FD31 interface is compatible with all trim levels of the following Ford vehicles:
- Bronco: 2021-2023
- Bronco Sport: 2021
- Eco Sport: 2021
- Edge: 2019-2022
- Escape: 2021-2022
- Expedition: 2018-2020
- Explorer: 2020-2023
- F-150: 2018-2023
- F-250/350/450/550: 2020-2023
- Lightning: 2022
- Maverick: 2022
- Mustang Mach E: 2021
- Ranger: 2020-2023
3. Key Features
- Digital Audio Output: Provides a pure digital audio output (TOSLINK) for use with amplifiers or audio processors equipped with a TOSLINK input.
- Simplified Amplifier Installation: Streamlines the installation of aftermarket amplifiers in databus-controlled factory sound systems.
- Factory System Retention: Retains the original radio’s fit, finish, and features, including factory Bluetooth and warning chimes.
- Direct Amplifier Connection: Connects directly at the factory amplifier location, not at the radio.
- Adjustable Chime Volume: Allows for adjustment of the factory chime volume.
- Flat Signal Output: Generates a flat signal for six RCA outputs at 5 volts, ensuring a clean audio signal for aftermarket amplifiers.
- Sub-Level Controller: Includes a dedicated controller for subwoofer output level adjustment.
4. Package Contents
The AmpPRO 4 AP4-FD31 package typically includes the following components:
- PAC AmpPRO 4 Interface Module
- Vehicle-specific wiring harnesses for integration
- Sub-level control knob with cable
- Installation manual
5. Setup and Installation
Installation of the AmpPRO 4 AP4-FD31 involves integrating the module and its harnesses into the vehicle's existing audio system. It is recommended that installation be performed by a qualified professional to ensure proper functionality and to avoid damage to the vehicle's electrical system.
5.1 General Installation Steps
- Vehicle Disconnection: Disconnect the vehicle's battery before beginning any electrical work.
- Access Factory Amplifier: Locate and access the factory amplifier in your vehicle. The AmpPRO 4 connects at this location, not behind the radio.
- Harness Connection: Connect the provided vehicle-specific harnesses between the factory amplifier and the AmpPRO 4 module. These harnesses are designed to interface with the OEM speaker wire without requiring cutting or splicing of factory wiring.
- Aftermarket Amplifier Connection: Connect your aftermarket amplifier(s) to the RCA outputs or the TOSLINK digital output of the AmpPRO 4 module.
- Sub-Level Controller: Install the sub-level control knob in a convenient location within the vehicle and connect it to the AmpPRO 4 module.
- Power and Ground: Ensure proper power and ground connections for both the AmpPRO 4 module and your aftermarket amplifier(s).
- Secure Components: Securely mount the AmpPRO 4 module and all wiring to prevent movement and potential damage.
5.2 Configuration and Tuning
The AmpPRO 4 module may require configuration using a laptop to make adjustments, such as setting output levels and chime volume. Refer to the detailed installation guide provided with the product for specific software and connection instructions.
6. Operating Instructions
Once installed and configured, the AmpPRO 4 AP4-FD31 operates seamlessly with your vehicle's factory audio system. The primary function is to provide a clean, flat audio signal to your aftermarket amplifiers while maintaining all factory functionalities.
- Audio Playback: All audio sources from the factory radio, including AM/FM, satellite radio, CD, and Bluetooth, will be processed by the AmpPRO 4 and sent to your aftermarket amplifiers.
- Vehicle Chimes and Alerts: Warning chimes, navigation prompts, and other vehicle alerts will be retained and can be adjusted for volume through the configuration software.
- Subwoofer Control: Use the included sub-level control knob to adjust the output level of your aftermarket subwoofer(s) independently.
- Volume Control: The factory radio's volume knob will continue to control the overall system volume.
7. Maintenance
The PAC AmpPRO 4 AP4-FD31 is designed for long-term, maintenance-free operation. To ensure optimal performance and longevity:
- Secure Installation: Ensure all connections remain secure and the module is firmly mounted to prevent vibration-induced issues.
- Environmental Protection: Keep the module free from excessive moisture, dust, and extreme temperatures.
- Software Updates: Periodically check the manufacturer's website for any available firmware updates for the AmpPRO 4 module.
8. Troubleshooting
If you encounter issues with your AmpPRO 4 AP4-FD31, consider the following troubleshooting steps:
8.1 No Audio Output
- Check Connections: Verify all wiring harnesses are securely connected to the AmpPRO 4 module, factory amplifier, and aftermarket amplifier(s).
- Power Supply: Ensure the AmpPRO 4 module and aftermarket amplifiers are receiving proper power and ground. Check fuses if necessary.
- Amplifier Status: Confirm that your aftermarket amplifier(s) are powered on and not in protection mode.
- Configuration: Re-check the module's configuration using the PAC software to ensure correct output settings.
8.2 Intermittent Audio or Digital Output (TOSLINK) Issues
- Secure Mounting: Ensure the AmpPRO 4 module is securely mounted and not subject to excessive vibration, which can cause intermittent connections.
- TOSLINK Cable: Inspect the TOSLINK cable for damage and ensure it is firmly seated at both ends.
- Connection Integrity: Check all wiring harness connections for looseness or corrosion.
8.3 Remote Turn-On Stays On
- Vehicle Compatibility: Double-check that your vehicle is fully compatible with the AP4-FD31 model.
- Module Reset: Try resetting the AmpPRO 4 module by disconnecting and reconnecting the vehicle's battery (after ensuring all components are off).
- Firmware: Ensure the module has the latest firmware installed.
If problems persist after attempting these steps, contact PAC technical support or consult a professional installer.
9. Specifications
| Model | AP4-FD31 |
| Brand | PAC |
| Item Weight | 1.17 pounds |
| Package Dimensions | 8.5 x 5.83 x 2.24 inches |
| Voltage | 5 Volts (output) |
| Output Channels | 6 RCA outputs, 1 TOSLINK digital output |
| Compatibility | Select 2018+ Ford vehicles with factory-amplified B&O A2B sound systems |
10. Warranty and Support
For specific warranty information regarding your PAC AmpPRO 4 AP4-FD31, please refer to the documentation included with your product or visit the official PAC Audio website. Warranty periods can vary, and it is important to register your product if required.
For technical support, installation assistance, or to report a defective unit, please contact PAC Audio customer service directly. Contact information can typically be found on the manufacturer's website or in the product packaging.
