This procedure covers the removal and replacement of the horn assembly on a 2015-2020 Ford F-150 with the 3.5L EcoBoost V6 engine.

Warnings

Tools required

Parts

• Horn assembly × 1 — Use OEM specification

Preparation

1. Park vehicle on level ground and engage parking brake
2. Turn ignition off and remove key
3. Open hood and disconnect negative battery cable using 10mm socket
4. Wait 2 minutes for airbag system capacitors to discharge
5. Turn front wheels fully to the right for better access to driver side components

Procedure

1. 1

   Access horn location
   From underneath the front driver side of the vehicle, locate the horn assembly mounted to the frame rail behind the front bumper. The horn will be a disc-shaped component approximately 4 inches in diameter with an electrical connector attached.
2. 2

   Disconnect electrical connector
   Press the locking tab on the horn electrical connector and pull the connector straight off the horn terminal. If the connector is difficult to remove due to corrosion, gently wiggle while pulling. Do not pull on the wiring harness itself.
3. 3

   Remove horn mounting bolt
   Using a 10mm socket with extension, remove the single mounting bolt securing the horn to the frame rail bracket. The bolt threads into a captive nut on the bracket. Support the horn with your hand as you remove the bolt to prevent it from falling.
   Torque spec

   Horn Mounting Bolt15 Nm (11 lb-ft)
4. 4

   Remove horn assembly
   Pull the horn assembly away from the mounting bracket. Note the orientation of the horn and the position of any spacers or grommets between the horn and bracket for proper reinstallation.
5. 5

   Inspect mounting bracket and ground connection
   Examine the mounting bracket for corrosion or damage. Check that the ground connection point on the frame rail is clean and free of rust. Use a wire brush to clean the mounting surface if necessary. The horn grounds through the mounting bracket, so a clean metal-to-metal contact is essential for proper operation.
6. 6

   Install new horn assembly
   Position the new horn onto the mounting bracket with the same orientation as the original. Ensure any spacers or grommets are in place. Thread the mounting bolt by hand first to ensure proper alignment, then tighten to specification using a torque wrench.
   Torque spec

   Horn Mounting Bolt15 Nm (11 lb-ft)
7. 7

   Connect electrical connector
   Push the electrical connector onto the horn terminal until the locking tab clicks into place. Gently tug on the connector to verify it is fully seated and locked.
8. 8

   Reconnect battery
   Return to the engine bay and reconnect the negative battery cable. Tighten the battery terminal bolt securely.

Reassembly

1. Ensure the horn mounting bolt is torqued to 15.0 Nm (11.0 lb-ft)
2. Verify the electrical connector is fully seated and locked
3. Confirm the horn has proper ground contact through clean mounting surfaces

Verification

• Turn the ignition to the ON position without starting the engine
• Press the horn button on the steering wheel and verify the horn sounds clearly
• If horn does not sound, verify the electrical connector is fully seated and check that the mounting bracket provides a clean ground connection
• Test horn operation multiple times to ensure consistent performance
• Turn wheels back to center position and close hood

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