Axxess XSVI-5521-NAV

Radio Replacement Interface Harness w/ Retain Accessory Power for Select 2006+ Ford Vehicles

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Axxess Audio Store

Product Features:

  • Vehicle Interface Harness
  • Used in standard amplified systems
  • For 2006-2010 Ford vehicles
  • Retains accessory power (R.A.P.)
  • Includes a direct plug in for the Axxess ASWC
  • Designed to provide a 12 volt 10 amp switched accessory output along with the rest of the wires needed to install an aftermarket radio
  • Provides VSS (Vehicle Speed Sense), mute, parking brake, and reverse signals to an aftermarket navigation receiver, making the installation easier
  • High level speaker input
  • Allows USB updates
  • Does not retain THX/SONY sound systems
  • Authorized Internet Dealer
  • 1-year Manufacturer's warranty


  • Ford:
    • Econoline 2009-up
    • Edge 2007-up
    • Escape 2008-up
    • Expedition 2007-up
    • Explorer 2009-2010
    • Flex 2008-up
    • Focus 2008-2011
    • Fusion 2011-up
    • F-150 2009-up
    • F250/350/450/550 2011-up
    • Mustang 2009-up
    • Sport Trac 2009-2010
    • Taurus 2010
    • Taurus/X 2009
  • Lincoln:
    • MKX 2007-2011
    • MKZ 2007-2011
    • Navigator 2007
    • Zephyr 2006
  • Mazda:
    • Tribute 2008-2010
  • Mercury:
    • Mariner 2008-2011
    • Milan 2010
    • Mountaineer 2009-2010
    • Sable 2008

Harness Features

Main Harness Function
Different installations on different vehicles require different harnesses. This type is what the harness is considered. Each wiring harness we sell serves a purpose such as installing an aftermarket car stereo, integrating an aftermarket amplifier with your factory car stereo, connecting Bluetooth to your factory car stereo, and more.
Connect/Install an Aftermarket Car Stereo
Additional Harness Features
The various features that the wiring harness provides to your car stereo and/or audio system.
Retained Accessory Power (RAP) Retention
Compatible Vehicle Make
Allows you to view only items that are compatible with your vehicle's make. Does not guarantee that it will work with your vehicle year or model.
Compatible Vehicle Make and Model
The model of vehicle that this vehicle specific product is designed for. Please keep in mind that engine variations can affect the compatibility of the products.
Ford Econoline
Ford Edge
Ford Escape
Ford Expedition
Ford Explorer
Ford F-150
Ford F-250
Ford F-350
Ford F-450
Ford F-550
Ford Flex
Ford Focus
Ford Fusion
Ford Mustang
Ford Sport Trac
Ford Taurus
Lincoln MKX
Lincoln MKZ
Lincoln Navigator
Lincoln Zephyr
Mazda Tribute
Mercury Mariner
Mercury Milan
Mercury Mountaineer
Mercury Sable

Premium Harness Features

Factory System Amplification
This refers to the factory sound system and whether the item is compatible with amplified or non-amplified systems.
Compatible with Aftermarket Navigation Systems
This means that the item is made to work with aftermarket systems with navigation. Typically, this means that the harness has wires that are used with GPS navigation systems, such as VSS wires and others. Please read the product description for full details of this feature.

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating


Timberon, NM


September 17, 2013

This unit comes with instructions that are complete and easy to follow. A 2008 Ford Explorer, removal and then installation of a Kenwood DVD/GPS took me less than 2 hours from start to finish. All my features continued and it was as simple as hooking colored wires to the same colored wires on the unit.

25 of 28 found this helpful

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West Jordan, UT

Has everything you could need.

September 28, 2013

If you have a xls or base model ford, this one is not required, you can get the cheaper one. But with that being said, this this is built solid, the wiring was actually thicker awg than my head unit!

15 of 19 found this helpful

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Cheyenne, WY

Works Great

October 3, 2014

The harness works great. Be prepared to splice a number of wires to the harness that comes with your aftermarket radio.

13 of 16 found this helpful

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Browse 2 questions and 2 answers
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Why did you choose this?
Sonic Electronix Store
Required for stereo install
Kofi A on Sep 1, 2014
what is the male plug for on the xsvi-5521?
Richard F on Apr 1, 2015
Best Answer: In the Ford/Lincoln/Mercury vehicles listed on back there are no 12 volt accessory wires in the factory radio harness making the installer run an accessory wire to the fuse box or underneath the steering column when installing an aftermarket radio.
The XSVI-5521-NAV is designed to provide a 12 volt
10 amp switched accessory output along with the rest of the wires needed to install an aftermarket radio. The R.A.P. (Retained Accessory Power) function is retained by the XSVI-5521-NAV.

So the purpose of this harness is to provide an accessory power that allows you to maintain the factory feature of when you turn the car off the radio stays on till you open the door.

As to where that plug is actually supposed to go, I'm not positive, I ran an external accessory wire from my ignition swich, so in mine the radio turns off with the key.
Reply · Report · Jay J on Apr 1, 2015
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Product Summary


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Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Axxess XSVI-5521-NAV

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Axxess XSVI-5521-NAV

Radio Replacement Interface Harness w/ Retain Accessory Power for Select 2006+ Ford Vehicles


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