Replace the horn relay in the engine compartment fuse/relay box to restore horn functionality.

Warnings

Tools required

Parts

• Horn relay × 1 — Hyundai OEM relay or equivalent 20A automotive relay

Preparation

1. Park vehicle on level surface and turn off ignition
2. Allow engine to cool if recently operated
3. Locate the engine compartment fuse/relay box on the driver's side near the battery
4. Have replacement relay ready and verify it matches the original

Procedure

1. 1

   Disconnect battery negative terminal
   Using a 10mm wrench or socket, loosen the battery negative terminal bolt and remove the cable from the battery post. Secure the cable away from the battery to prevent accidental contact.
   Torque spec

   Battery Terminal Bolts6 Nm (4 lb-ft)
2. 2

   Access the fuse/relay box
   Open the hood and locate the engine compartment fuse/relay box on the driver's side near the battery. Release the retaining clips on both sides of the cover by pressing or lifting them, then remove the cover.
3. 3

   Identify the horn relay location
   Consult the relay diagram printed on the underside of the fuse box cover or in the owner's manual. The horn relay is typically labeled as 'HORN' and is usually a small plug-in relay in the relay section of the box. Note its position and orientation.
4. 4

   Remove the old horn relay
   Grasp the horn relay firmly and pull straight up to remove it from its socket. If the relay is difficult to remove, use a relay puller tool or carefully use needle-nose pliers to grip the relay body (not the terminals) and pull straight up with steady pressure.
5. 5

   Inspect relay socket and terminals
   Examine the relay socket for corrosion, debris, or damaged terminals. Clean any corrosion with electrical contact cleaner if present. Check that all socket terminals are intact and properly seated. Compare the old relay to the new relay to confirm they match in pin configuration and rating.
6. 6

   Install new horn relay
   Align the new horn relay with the socket, ensuring the orientation matches the diagram on the fuse box cover. Push the relay straight down into the socket until it is fully seated and clicks into place. The relay should sit flush with adjacent relays.
7. 7

   Reinstall fuse box cover
   Position the fuse/relay box cover back onto the box, ensuring any rubber seals are properly seated. Press down on the cover until the retaining clips snap into place on both sides. Verify the cover is secure and properly sealed.
8. 8

   Reconnect battery negative terminal
   Place the negative battery cable back onto the battery negative post. Hand-tighten the terminal bolt, then torque to specification using a torque wrench. Ensure the connection is secure but do not exceed the torque specification.
   Torque spec

   Battery Terminal Bolts6 Nm (4 lb-ft)

Reassembly

1. Ensure fuse box cover is fully latched and seated properly to maintain weather seal
2. Verify battery terminal is tight and properly torqued to prevent electrical issues

Verification

• Turn ignition to ON position without starting engine
• Press the horn button on the steering wheel - horn should sound immediately and continuously while button is pressed
• Test horn multiple times to verify consistent operation
• If horn still does not work, verify fuse is intact, check horn button operation, and test horn ground connections
• Check that no warning lights appear on instrument cluster related to electrical systems

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