What is the reason why the Teana horn sometimes works and sometimes doesn't?

[RuthRose]

The reason why the Teana horn sometimes works and sometimes doesn't is due to a short circuit in the power line. The functions of the Teana horn are: 1. To warn pedestrians and vehicles; 2. To urge movement and convey signals. Taking the 2021 Teana Fashion Edition as an example, its body dimensions are: length 4901mm, width 1850mm, height 1450mm, wheelbase 2825mm, fuel tank capacity 61.3 liters, and trunk capacity 586 liters. The front suspension of the 2021 Teana Fashion Edition is a MacPherson independent suspension, and the rear suspension is a trapezoidal control arm multi-link independent suspension. It is equipped with a 2.0L naturally aspirated engine, with a maximum horsepower of 156ps, maximum power of 115kW, maximum torque of 197Nm, and is paired with a continuously variable transmission.

[DelBrandon]

As a veteran driver who has been driving a Teana for over a decade, I believe the most common issue with intermittent horn functionality is wiring connection problems. The horn button under the steering wheel is connected to the horn unit via wires, and if the connector becomes loose, rusty, or oxidized at the contact points, it can lead to poor contact. For example, on bumpy roads or during humid weather, vibrations and moisture can exacerbate the issue—I encountered this last time when driving over potholes, and upon inspection, found the wire plug covered in rust. Cleaning or tightening the connector often resolves it. Additionally, aging or damaged wiring may cause short circuits or breaks, especially at body connection points prone to wear. Regularly checking continuity with a multimeter helps. Don’t overlook these small details—a non-functional horn in critical moments is dangerous. It’s best to have a repair shop inspect the wiring during routine maintenance. Simple upkeep can prevent major headaches.

[VonAlexander]

My Teana's horn also occasionally malfunctions, most likely due to an issue with the steering wheel button switch. Sometimes it doesn't respond when pressed, but occasionally works—often caused by worn internal contacts or accumulated dirt in the button. Prolonged driving and frequent horn use can oxidize or deform the contacts, leading to poor connectivity. Cold weather or high humidity exacerbates the problem due to metal expansion and contraction. I've encountered this before—cleaning the contacts or applying lubricant restored normal function. If the button assembly is damaged, it needs replacement. I recommend minimizing unnecessary horn use to extend the switch's lifespan. During inspection, pay attention to whether the button feels stiff or produces unusual sounds; address issues early to avoid hazards. If unsure about disassembly, consult a professional—don't take risks.

[LawsonAnn]

Among the causes of unstable horn performance, the failure of the horn unit itself should not be overlooked. The electromagnetic coil contacts may be eroded or loose, leading to intermittent issues. I've disassembled a few while working on cars—aged coils or carbon buildup on contact plates can cause delayed responses. Cold weather or strong vibrations worsen the contact, like when the horn occasionally fails after long drives. Replacing the horn is inexpensive, but first confirm it's the root cause. A simple test: directly power the horn to check if it sounds. Keep it in a dry environment to extend its lifespan. Don’t underestimate this—safety comes first while driving.