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PAC AmpPro AP4-FD31 Amplifier Interface Allows seamless addition of an amp in select 2018-up Ford vehicles with B&O factory systems

Item # 541AP4FD31

You can make your Ford's less-than-ideal factory system actually sound premium by upgrading the weak factory...

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You can make your Ford's less-than-ideal factory system actually sound premium by upgrading the weak factory...

Item # 541AP4FD31

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  • Free lifetime tech support
  • 60-day price-drop protection
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$459.00

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About the PAC AmpPro AP4-FD31 Amplifier Interface

Buck Pomerantz

Product highlights:

  • amplifier integration module and T-harness
    • add an aftermarket amplifier after removing factory amp
  • works with select 2018-up Ford-built vehicles
  • 6-channel RCA outputs (front, rear, subs)
  • 5 volts RMS output
  • optical digital output
  • retains factory radio controls and audio features
  • wired remote level control for sub channels
  • remote turn-on lead for amplifiers
  • AmpPRO PC App from PAC lets you adjust minimum volume and 3-band EQ via your Windows-run PC
  • warranty: 1 year
  • MFR # AP4-FD31
  • Item # 541AP4FD31
  • California customers: Please click here for your Proposition 65 WARNING.

What's in the box:

PAC AmpPro AP4-FD31 Amplifier Interface owner's manual

If you need assistance accessing this owner's manual, please give us a call.
  • Amplifier integration module
  • 20" Main harness (AP4FD31HARV3) with inline 3A mini fuse
  • 8" APHFDO3 V1 T-harness
  • 8" APHFD22 V1 T-harness
  • Remote level control with connected 16' cable
  • Installation instructions

More details on the PAC AmpPro AP4-FD31 Amplifier Interface

Stacey B.

Product Research

Features

Amplifier Integration Interface: The PAC AmpPRO AP4-FD31 simplifies the installation of aftermarket amplifiers in select Ford vehicles with data-bus controlled factory B&O (Bang & Olufsen) sound systems. With the AmpPRO AP4-FD31, you can improve your vehicle's audio performance while keeping an original radio's fit, finish, and features.

Notes:

  • The factory amplifier must be disconnected to install the PAC AmpPRO interface. An aftermarket amplifier/s must be added to power the vehicle speakers.
  • The PAC AP4-FD31 cannot be used to only add a subwoofer to the factory system.

Vehicle Compatibility: The PAC AmpPRO AP4-FD31 amplifier integration interface is compatible with the following 2018-2023 Ford vehicles with a data-bus controlled factory premium sound system.

Make Model Year Trim Level
Ford Bronco 2021-2023 All
Bronco Sport 2021
Eco Sport 2021
Edge 2019-2022
Escape 2021-2022
Expedition 2018-2020
Explorer 2020-2022
F-150 2018-2023
F-250 2020-2023
F-350 2020-2023
F-450 2020
Lighting 2022
Maverick 2022
Mustang Mach E 2021
Ranger 2020
Note: This interface is only compatible in vehicles equipped with a data-bus controlled B&O (Bang & Olufsen) sound system. To verify compatibility, look for a B&O badge on the door speakers or dash speakers.

6Ch Pre-Outs: The PAC AmpPRO AP4-FD31 provides a 6-channel pre-amp output for use with aftermarket amplifiers. Using the factory digital A2B audio data in conjunction with data-bus CAN messages, the AP4-FD31 delivers a variable 5V RMS pre-amp output with fading, balance, equalization, and level control capabilities.

Toslink Output: The AP4-FD31 can provide a variable 2-channel fiber optic digital audio output (toslink). Toslink fiber-optical cable sold separately.

Non-Fading Level Control Knob: Channels 5-6 (Sub) of the AP4-FD31 are non-fading outputs. The output level of channels 5-6 can be controlled using the supplied level control knob. The level control knob includes a 16' cable which plugs into the interface module and should be mounted in an accessible location at the front of the vehicle.

Data Controlled Remote Turn-On: A data controlled remote amplifier turn on wire is also provided by the PAC AmpPRO AP4-FD31. The remote turn-on is rated at 2A of current. If more current is needed an external relay must be used.

Retained Factory Audio Features: The PAC AmpPRO AP4-FD31 also retains all audio from other vehicle features such as factory Navigation Prompts, Bluetooth, Sync, and Warning Chimes.

Minimum & Chime Volume: If the minimum volume of your factory radio is too loud once the AP4-FD31 is installed, you can manually set the level of the minimum volume using either the programming button on the side of the interface or the factory SWC (Steering Wheel Controls) in conjunction with the supplied level control knob. You can also use AmpPRO PC app. You can also adjust the chime volume level.

AmpPRO PC App: Using the AmpPRO PC App (for Windows PC only) allows you to configure user interface options such as Minimum Volume Level, Chime Volume Level, and a 3-Band EQ from your Windows computer or laptop. The app can also be used to update product firmware.

  • Minimum & Chime Volume Level: From the app you can set the minimum volume level of the factory radio, as well as the chime volume level.
  • 3-Band EQ: Enables the 3-band EQ (Bass-Mid-Treble) with frequency and Q-factory adjustment. The Bass Frequency can be set to 60, 80, 100, or 120Hz; while the Bass Q-Factor can be set to 0.5, 1.0, 1.5, or 2.0. The Mid Frequency can be set to 500, 1k, 1.5k, or 2.5k; while the Mid Q-Factor can be set to 0.75, 1.0, 1.25, or 1.5. The Treble Frequency can be set to 7.5k, 10k, 12.5k, or 15k; while the Treble Q-Factory can be set to 0.75 or 1.25.
  • Firmware: The AmpPRO app will also allow you to update the interface with new firmware as it becomes available.
Note: These AmpPRO PC App settings can be adjusted with the module installed in the vehicle or on the bench. However, it is recommended to make the adjustments with the module installed, and the factory radio on so that the changes can be heard.

Dip Switches:

  • Switch 1: ON switches the interface into 2-channel mode. All outputs will be non-fading and all chimes are sent to channels 1 & 2 and the Toslink optical output.
  • Switch 2: ON lowers the RCA output voltage to 4V. Set the dip switch 2 OFF to keep the RCA output voltage at 5V.
  • Switch 3: Not used.
  • Switch 4: This switch gets set to ON if installing the interface in a Mach-E series vehicle, and OFF for all other models.

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Customer Q&A

4 questions already asked

Q
I have the upgraded system that includes center dash speaker. Is this compatible?
cliff  Aug 27, 2024
1 answer
A
Greetings Cliff. Thank you for your question. What we are going to need is the vehicle information to take a look.
thomas  Aug 27, 2024 (Staff)
Q
What cable do I need to connect to laptop?
daniel  Jun 02, 2024
1 answer
A
You would just need a standard micro USB to USB-A cable like the one below: https://www.crutchfield.com/I-rET1c402/p_120MINICAB/Axxess-USB-MINI-CAB.html
red  Jun 03, 2024 (Staff)
Q
It seems that this unit is intermittently turning on and off my amps. Why is this happening? And how do I get it to stop.
tyson  Apr 09, 2024
2 answers
A
There are updated firmware versions on the manufacturer's website that may be related to this.
benjamin  May 18, 2025
A
We provide lifetime Technical Support for all products purchased from Crutchfield, Tyson. If you are having any issues with your PAC AmpPro adapter, please call our Technical Support hotline with your order number handy and we would be happy to help troubleshoot.
bo  Apr 10, 2024 (Staff)
Q
If I'm using the toslink connection, can I also use the RCA outputs?
tyson  Feb 12, 2024
1 answer
A
Per the PAC owner's manual, there is no specific mention of the Toslink not being active when outputting signal through the RCA outputs, Tyson. If you are connecting both with Toslink AND RCA analog outputs to your amplifiers, you should be able to use those outputs simultaneously.
bo  Feb 13, 2024 (Staff)

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