BMW M5 Horn Replacement Guide for 1988-1999 Models
If your M5's horn has gone silent or sounds weak, this guide will help you diagnose the problem and choose the right replacement part.
- Always troubleshoot the fuse and relay first before assuming the horn has failed.
- Horns should be replaced in pairs (both high and low tone) to ensure a correct and balanced sound.
- Accessing the horns on an M5 typically requires removing the front wheel and wheel well liner, and sometimes the front bumper.
- Aftermarket brands like Standard Ignition offer a quality, cost-effective alternative to more expensive OEM parts.
Is it the Horn, or Something Else?
Before you buy a new horn, it's important to check a few other components. On many BMWs, the cause of a silent horn isn't the horn unit itself. The most common failures are a blown fuse, a bad horn relay, or a worn-out slip ring (also called a clock spring) in the steering column.
- Check the Fuses: Your owner's manual will show you the location of the horn fuse(s). It's the easiest and cheapest thing to check first.
- Check the Relay: The horn relay is an electronic switch that can fail over time. You can often test it by swapping it with an identical relay from another system (like the fuel pump).
- Listen for a Click: When you press the horn button, listen for a faint 'click' sound from the relay, which is often located behind the glove box. If you hear a click but the horn doesn't sound, the problem is likely the wiring or the horn itself. If you don't hear a click, the problem is more likely the relay, fuse, or the slip ring in the steering wheel.
Pro Tip: Test the Horn Directly
If you can access the horn, you can test it by disconnecting its electrical plug and connecting it directly to a 12V power source, like the car battery. If the horn sounds, you know the unit is good and the problem lies elsewhere in the circuit.
Choosing the Right Aftermarket Horn
If you've confirmed the horn itself has failed, you have a few options. Since these horns are sold individually (high or low tone), it's highly recommended to replace them in pairs. This ensures a correct, balanced sound. Mixing an old horn with a new one can result in an uneven or weak tone.
Brand Tiers
- Standard Ignition: Standard Motor Products (SMP) is a well-regarded manufacturer that produces parts that meet or exceed original equipment (OE) specifications. Their horns are known for being reliable, durable, and providing a factory-correct sound. This is a solid choice for an owner who wants a quality part without the dealership price tag.
- Replacement: This brand tier offers a direct-fit, functional horn at a lower cost. While it will get the job done, it may not have the same longevity or precise tone as a higher-tier brand or an OEM part. This is a good budget-friendly option to restore function to your vehicle.
Important Safety Note
Always disconnect the negative terminal of your car's battery before beginning any electrical work, including replacing the horn.
Typical Horn Replacement Costs for a 1988-1999 BMW M5
| Part Type | Estimated Cost (Per Horn) |
|---|---|
| New OEM | $58 - $78 |
| New Aftermarket | $36 - $77 |
| Shop Labor | $100 - $200 |
Frequently Asked Questions
Where are the horns located on my M5?
On the E39 M5 (1998-1999), the dual horns are located in the front of the car, behind the bumper cover. One is typically accessible by removing the driver's side front wheel and the plastic wheel well liner. The other may require partial or full removal of the front bumper to access. The location is similar for earlier E28 and E34 models, generally in the front grille or bumper area.
My horn sounds weak or like a "clown car." What's wrong?
This is a classic symptom of one of the two horns (high or low tone) failing. Since your M5 has a dual-tone system, when one stops working, you're only hearing half of the intended sound. The solution is to identify which horn has failed and replace it. It is best practice to replace both at the same time.
Can I install a louder, custom horn?
Yes, many owners choose to upgrade to louder aftermarket horns. However, be aware that high-powered horns may draw more electrical current than the factory wiring is designed for. This may require you to install a new, separate relay and wiring harness to avoid blowing fuses or damaging the electrical system.
Are there any recalls for the horn on the 1988-1999 M5?
No, searches of the National Highway Traffic Safety Administration (NHTSA) database and other sources did not find any horn-specific recalls or widespread technical service bulletins (TSBs) for the 1988-1999 BMW M5 models.
Technical Specifications
OEM Part Numbers: 61338379712 61336935987 61337245422 61337839345
System Type: Dual-tone (High and Low Pitch) Voltage: 12V Common Locations: Behind front bumper, inside driver-side front wheel well.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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