electrical

Horn

for 2017 Ford F-150 5.0L V8 Coyote · RWD

Difficulty

Easy

Time

42 min

Tools

Steps

🤖AI-generated, not yet human-verified. This walkthrough was produced by AI and may contain errors. Treat it as a guide, cross-check every step and torque value against the manufacturer's service manual, and stop if anything looks unsafe. This is a moderate-risk job — take extra care.

This procedure covers the diagnosis, removal, and replacement of the horn assembly on a 2015-2020 Ford F-150 with the 5.0L Coyote V8 engine.

Warnings

⚠Disconnecting the battery will reset radio presets, clock, and may require relearning of adaptive drivetrain parameters.

ℹ️The F-150 uses dual horns (high and low tone). Diagnose which horn has failed before ordering parts.

Tools required

10mm socket and ratchetEssential

Socket extension (6-inch)Essential

Torque wrenchEssential

Multimeter or test lightEssential

Wire brush or sandpaper

Flashlight

Parts

Horn assembly (high/low tone as required) × 1 — Ford FL3Z-13832-A (high tone) or FL3Z-13833-A (low tone)
Anti-seize compound × 1 — Use OEM specification

Preparation

Park vehicle on level ground and engage parking brake
Turn off ignition and remove key
Allow engine to cool if recently driven
Open hood and secure with prop rod

Procedure

1
Disconnect battery negative terminal
Using a 10mm socket, loosen the negative battery terminal bolt and remove the negative cable from the battery. Secure the cable away from the battery terminal to prevent accidental reconnection during the repair.
Torque spec
Battery Terminal Bolts8 Nm (6 lb-ft)
2
Locate horn assemblies
The horns are mounted on the driver's side of the radiator support, behind the grille. Access is gained from the top of the engine bay. One horn is the high tone (smaller) and one is the low tone (larger). Identify which horn requires replacement by visual inspection for damage or corrosion.
3
Disconnect horn electrical connector
Press the locking tab on the electrical connector and pull straight back to disconnect from the horn. If the connector is corroded or difficult to remove, gently wiggle while pulling. Inspect the connector terminals for corrosion or damage.
4
Remove horn mounting bolt
Using a 10mm socket with extension, remove the single mounting bolt securing the horn to the radiator support bracket. The horn is mounted with a single bolt through a rubber grommet. Retain the mounting hardware for reinstallation if reusable.
Torque spec
Horn Mounting Bolt15 Nm (11 lb-ft)
5
Remove defective horn
Pull the horn assembly away from the mounting bracket. The horn may be secured with a rubber isolator that helps reduce vibration. Note the orientation of the horn and mounting hardware for proper reinstallation.
6
Inspect mounting bracket and ground connection
Examine the mounting bracket for damage, cracks, or excessive corrosion. The horn grounds through the mounting bracket, so ensure the mounting surface is clean and free of rust or paint. Use a wire brush to clean the ground contact surface if corrosion is present. Verify the bracket is securely fastened to the radiator support.
7
Prepare new horn for installation
If installing a new horn, verify it matches the tone (high or low) of the removed unit. Apply a small amount of anti-seize compound to the threads of the mounting bolt to prevent future corrosion and ensure proper grounding. Ensure the rubber isolator/grommet is properly positioned on the horn mounting stud.
8
Install horn assembly
Position the new horn into the mounting bracket, aligning the mounting stud with the hole in the bracket. Ensure the horn is oriented correctly with the electrical connector facing outward for easy access. Install the mounting bolt finger-tight initially.
Torque spec
Horn Mounting Bolt15 Nm (11 lb-ft)
9
Torque horn mounting bolt
Using a torque wrench with 10mm socket, tighten the horn mounting bolt to specification. Do not overtighten as this can compress the rubber isolator excessively and affect horn tone or damage the mounting bracket.
Torque spec
Horn Mounting Bolt15 Nm (11 lb-ft)
10
Reconnect horn electrical connector
Push the electrical connector onto the horn terminal until the locking tab clicks into place. Gently tug on the connector to ensure it is fully seated and locked. Inspect the connection to ensure no exposed terminals.
11
Reconnect battery negative terminal
Reinstall the negative battery cable to the battery terminal. Tighten the terminal bolt to specification using a torque wrench. Ensure the connection is secure and the cable cannot rotate on the terminal.
Torque spec
Battery Terminal Bolts8 Nm (6 lb-ft)

Reassembly

Ensure all electrical connectors are fully seated and locked
Verify horn mounting bolt is torqued to specification and horn is secure
Confirm battery terminal is clean and properly torqued

Verification

Turn ignition to ON position without starting engine
Press horn button on steering wheel and verify horn sounds with correct tone
If dual horns were serviced, verify both high and low tones sound simultaneously
Check for any rattling or loose mounting by gently pressing on the horn assembly
Verify no warning lights appear on instrument cluster related to electrical systems
Reset clock and radio presets as needed