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How To Install The FoxLox Keyless Entry System In A 1985-1993 Fox Body Mustang

Created by Andrew Perry / 5 min read
Date Created: 1/29/2025
Last Updated: 4/27/2026

Follow along as we guide you through the installation of the FoxLox keyless entry system! Seamlessly add a keyless entry to your 1985-1993 Fox Body Mustang Coupe or Hatchback with this plug-and-play FoxLox System!

Viewing this install and using the information shared is subject to the terms set forth here - View the LMR Install Instructions Disclaimer.
Modernize your coupe or hatchback Fox Body with this keyless entry system! Available as a "base kit" without acuators, or a kit that includes new door lock actuators. We recommend the full kit just for the peace of mind knowing you'll have new actuators. If you opt for the base kit, make sure the existing actuators are in good working condition. 

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Installation Instructions

Step 1: Disconnect Battery

  • Disconnect the negative battery cable.
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Step 2: Remove Kick Panel

  • Dislodge the push pin from the kick panel.
  • Remove the frontward screw from the scuff plate.
  • Pull the kick panel towards the drivers seat to dislodge the push pins, and remove the kick panel.
  • Depending on the year of the car, take this time to also remove any component from this general area that will allow for additional workroom.
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Step 3: Install FoxLox Harness

  • With clear access under the dash, reach up and find the harness that's coming through the harness sleeve in the door jamb. Manipulate the connections and wires with your hand until you see the harness sleeve move. Verify the connections and disconnect them.
  • Plug in the male connector on the FoxLox harness to the female connector on the factory harness.
  • Then plug in the female connector on the FoxLox harness to the male connector on the factory harness.
  • Find a good ground to use and install the ring terminal.
  • Connect the large white connector on the FoxLox harness to the module. This will only install one way.
  • Connect the program button to the module. This is the two pin white terminal.
  • Connect the optional blue LED status light to the module. This is the two pin blue terminal.
  • If the power hatch trunk latch works, locate the purple wire, and depending on age, the stripe may appear yellow or orange.
  • Disconnect the crimp connector from the spade terminal on the harness. Install the quick crimp over the purple wire to splice the wire and reconnect the spade terminal.
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Step 4: Test For Operation

  • Reconnect the negative batter cable and test for operation.
  • The passenger side actuator is triggered by pressing the lock button twice.
  • Verify that both transmitters and all functions work the way they're supposed to.

App Usage

  • If you want to use the app, scan the QR code on the instructions with your smartphone.
  • Select the Android Google Play store or the Apple App store whenever the web page loads.
  • Download the app and open it.
  • Turn the key to the on position but don't start the car.
  • Click the program button quickly five times, you will hear 3 audible beats indicating that the system is in programming mode.
  • In any order, touch the lock or unlock symbol on the app, and you'll hear one beep.
  • Press the lock or unlock button on one of the transmitters and you will hear 2 beeps.
  • Press the lock or unlock button on the second transmitter and you'll hear 3 beeps.
  • Turn the key to the off position and you'll hear 2 beeps indicating that the system has exited programming mode.
  • Check the transmitters and app for operation.

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Step 5: Complete Installation

  • Now that everything works, you can disconnect the negative battery cable and finish the install.
  • We chose to tuck the relay bank and module up behind the dash the best and cleanest way we could.
  • Make sure the program button is accessible, just in case you need it in the future.
  • Reinstall the interior pieces you removed earlier, and after that, you are good to go.
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About the Video

Modernize your Fox Body Mustang! FoxLox Keyless Entry System - Overview & Install

Check out our YouTube channel for even more tech tips, installation videos, how-tos, and more. The best place to go for anything Mustang related!

Published on 2024-12-18
Seamlessly add a keyless entry to your 1985-1993 Fox Body Mustang coupe or hatchback with FoxLox USA's plug-and-play keyless entry system. Available as a "base" kit without actuators, or a kit that includes new door lock actuators. We recommend the full kit just for the peace of mind knowing you'll have new actuators. If you opt for the "base" kit, make sure the existing actuators are in good working condition.
Thumbnail image of the author of this article, Andrew Perry.

About the Author

Andrew has been writing content for Late Model Restoration for over 2 years, producing over 50 articles. Over the years, Andrew has owned numerous Mustangs, including a 2007 V6, 2003 GT, 1967 GT, 1994 GT, 1995 GT, 2014 GT (2), 2000 V6 (V8 swapped), 2016 GT/PP, 1988 LX 5.0, and a 2009 GT/CS. Read more...