Mercedes W204 Anti-Theft Alarm Siren Horn Signal Bracket Holder A2045456740

MERCEDES W204 Alarm Siren Horn is an item from the Horns category, responsible for generating a clear acoustic signal in the vehicle's factory security system. Original origin from the Mercedes brand ensures proper fit with the electrical system and electronic architecture of the W204 model, which translates to stable operation of the alarm system.

Specifications and technical data

• SKU: A2045456740
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2045456740
• Substitutable numbers: A2045456740, A 204 545 67 40, A2045456640, A 204 545 66 40, A2045453247, A 204 545 32 47, EM
• Category: Horns

Purpose and Function in the Alarm System

The alarm siren horn in the Mercedes W204 is responsible for acoustic notification of a breach in the vehicle's security zones. A correctly functioning component from this group:

• provides a loud, distinctive warning sound,
• cooperates with the factory alarm controller and central locking,
• enables full functionality of the original security system.

By using a component from the Horns category dedicated to this generation of Mercedes, the alarm system maintains consistency with the vehicle's factory configuration.

Original Origin and Compatibility

The presented item is part of the Mercedes brand, which means compliance with factory quality standards and electrical parameters. Using an original alarm siren horn allows for:

• maintaining correct cooperation with the CAN installation and comfort modules,
• minimizing the risk of diagnostic errors and fault messages,
• preserving the sound characteristics and response times intended by the manufacturer.

An additional advantage is the presence of dedicated replacement numbers, which facilitates the selection of the correct variant for the specific vehicle equipment configuration.

Performance Characteristics and Installation

The alarm siren horn offered here is a Used item, which in practice means it comes from a dismantled vehicle and is intended for reinstallation in another vehicle. For this type of component, the following are crucial:

• maintaining appropriate electrical parameters,
• correct connectors enabling direct connection,
• compatibility with factory mounting points.

This makes installation in a Mercedes W204 typically a simple process, involving swapping the component in the existing harness without the need for wiring modifications.

Why Choose This Alarm Siren Horn

Choosing an original alarm siren horn for the Mercedes W204 is a beneficial solution both technically and economically. This type of component:

• maintains consistency with the vehicle's factory security system,
• limits the risk of alarm malfunction after replacement,
• ensures predictable system behavior in alarm situations.

For users planning extensive work on the acoustic security system or replacing other components responsible for the sound signal, it is important that the product has assigned replacement numbers, which facilitates verification of compatibility with a specific equipment version.

If you are considering upgrading or servicing the warning system in your Mercedes and are also interested in other acoustic solutions that work with the factory installation, check out the available parts in the Mercedes Horns category.

When selecting used alarm system components, especially as part of a larger upgrade or tuning project, it's worth knowing the typical pitfalls of the secondary market – practical tips can be found in the article Buying Used Car Parts • Common Mistakes When Choosing Tuning Parts.