Audi 5000 Horn Replacement and Diagnosis Guide (1978-1988)
Diagnosing a dead or weak horn on your Audi 5000 is easier than you think.
- A weak horn usually means one of the two horns has failed; no sound points to a fuse, relay, or wiring issue.
- Before buying parts, check the fuse and horn relay, and confirm the horn works only with the ignition ON.
- The horn's location under the car on some models makes it prone to damage from water and ice.
- Standard Ignition is a quality aftermarket brand for this part; generic 'Replacement' brands are a budget-friendly alternative.
Is Your Audi 5000 Horn Failing?
A problem with the horn on a 1978-1988 Audi 5000 usually shows up in a few predictable ways. Because the car uses a two-horn system, the failure of just one horn is a common issue. Understanding the symptoms can help you pinpoint the problem before you buy any parts.
Common Failure Symptoms
- Weak or Muffled Sound: This is the most frequent symptom. If your horn sounds quiet, "sick," or just not as loud as it used to, it almost always means one of the two horns (either the high or low tone) has failed. The remaining horn still works, but it lacks the volume of the pair working together.
- No Sound at All: Complete silence when you press the horn button points to a problem that affects the entire circuit. This could be a blown fuse, a bad horn relay, a wiring issue, or both horns failing at once (which is less likely). In some cases, owners have found the horn only works when the ignition is turned on.
- Intermittent Operation: If the horn works sometimes but not others, it often points to a loose electrical connection or a failing relay. The horns on some 5000 models are located in the front left corner under the car, making them vulnerable to corrosion, snow, and ice, which can cause intermittent faults.
Known Issues for the Audi 5000
The location of the horns on some models makes them very exposed to the elements. Owners have reported the horns filling with snow and ice during winter, causing them to stop working. Water and road salt can also corrode the electrical connectors and the horn itself over time, leading to failure. When replacing, ensure the new horn's opening doesn't face directly forward to prevent it from filling with water.
Choosing the Right Aftermarket Horn
For a classic vehicle like the Audi 5000, finding new original equipment (OEM) parts is nearly impossible. The market consists of new aftermarket parts and used OEM parts from salvage yards. Aftermarket horns are an excellent choice, offering modern reliability and a direct fit.
Brand Tiers
- Standard Ignition: A well-regarded brand in the aftermarket industry, Standard Motor Products (SMP) has been making parts for over 100 years. Their horns are designed as direct-fit OE replacements, ensuring proper fit and function without modification. Customer reviews are generally positive, citing good quality and a loud, clear tone, making them a reliable choice for a long-term repair.
- Replacement: This category represents generic, value-focused brands. While they are more budget-friendly, the fit and finish may not be as precise as a branded part like Standard Ignition. They are a functional choice for getting your horn working again, but may not offer the same longevity or exact sound as a higher-tier aftermarket part.
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket (Single Horn) | $36.29 - $57.52 |
| Shop Labor | $80 - $150 |
| Used OEM (Single Horn) | $20 - $50 |
| New OEM | Not generally available |
Pro Tip: Check the Easy Stuff First
Before you replace the horn itself, check the fuse. A blown fuse is a common and inexpensive fix. Sometimes the horn shares a fuse with other components, so check your owner's manual or a fuse diagram. If the fuse is good, the next step is to check the horn relay, which is often located in an auxiliary panel under the driver's side dash area. You can often test it by swapping it with an identical relay from another circuit.
Frequently Asked Questions (FAQ)
Why does my horn sound weak or like a sick cat?
This almost always means one of the two horns (high or low tone) has failed. Your Audi 5000 relies on both horns working together for a full sound. When one fails, you're only hearing half the sound, which results in a weak or high-pitched noise. You'll need to identify and replace the failed horn.
Where is the horn located?
On some Audi 5000 models, like the 1987 Turbo Quattro, the horns are located in the front, left corner, underneath the car. On other similar Audi models, they are located behind the front grille. You may need to remove the grille or splash shield to access them.
Is replacing a horn a DIY job?
Yes, for most home mechanics with a basic set of tools, this is a straightforward job. It typically involves removing the grille or a splash shield, unplugging the electrical connector, and removing a single bolt. The difficulty is low, and it can usually be done in under an hour.
Do I need to replace both horns at the same time?
You don't have to, but it's often a good idea. If one horn has failed due to age or exposure, the other one may not be far behind. Replacing them in pairs ensures a balanced, correct tone and saves you from having to do the job again in the near future.
Technical Specifications
System Type: Dual Horn (High and Low Tone) Voltage: 12V
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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.