Ford Focus Mk3 Start Stop Engine Ignition Switch Button CM5T-11572-AA

The Ford Focus Mk3 Start Stop Button Switch CM5T-11572-AA is a factory engine start system component, belonging to the switches, controls, and ignition switches group. Designed for precise integration with Ford electronics, it ensures convenient control of the start/stop function within the vehicle's cabin.

Specifications and technical data

• SKU: BM51-A11584-BBW
• Mark: Ford
• Condition: Used
• OEM Part Number: BM51-A11584-BBW
• Substitutable numbers: BM51-A11584-BBW, BM51A11584BBW, CM5T-11572-AA, CM5T11572AA
• Category: Switches & Controls

Technical Characteristics and Purpose

The start/stop button for the Ford Focus Mk3 is an OEM-class component, prepared to work within the vehicle's original ignition system. As part of the switches, controls, and ignition switches category, it is responsible for transmitting signals to the electronic system that manages engine start and stop.

This type of solution allows for:

• Keyless Engine Start – ignition control via a single button on the console.
• Compatibility with Factory Security System – integration with the immobilizer and body modules as specified by the manufacturer.
• Stable Control System Operation – appropriate electrical parameters matched to the Ford installation.

Construction and Function in the Control System

The start/stop switch is a component mounted in the interior panel, within the driver's reach. The design intended by Ford ensures:

• Distinct Button Click – clear confirmation of the switch's activation when starting or stopping the engine.
• Secure Connection to the Wiring Harness – a connector matched to the Focus Mk3 installation, facilitating assembly.
• Dashboard Integration – shape and mounting method consistent with the factory control panel.

This allows the button to function as an intermediary between the user and the vehicle's electronics, maintaining predictable start/stop system response.

Benefits of Using an Original Ford Switch

Using an original start/stop switch in the Ford Focus Mk3 offers a range of practical operational benefits:

• Factory Electrical Matching – the switch's parameters comply with the requirements of Ford's control modules.
• Consistent Interior Ergonomics – appearance and operation match the solutions intended by the vehicle manufacturer.
• Reduced Risk of System Errors – using the correct component minimizes the likelihood of fault messages related to the ignition system.

This solution is particularly recommended for replacing a damaged button or restoring full start/stop system functionality after electrical system repairs.

Condition and Application in Service

The offered switch is used, making it an attractive cost-effective alternative to new parts while maintaining original Ford specifications. This type of part is suitable for:

• Collision Repairs – restoring the ignition control system after interior damage.
• Electronics Service – replacing a malfunctioning button in vehicles with the start/stop function.
• Restoring Full Cabin Functionality – when the existing component exhibits response issues to pressing.

Other Ford Switches and Knowledge of Used Parts

If you are looking for other components from the Ford switches, controls, and ignition switches category, check out our offer, where you will find dedicated solutions for various models of this brand: Ford switches, controls, and ignition switches.

When choosing dismantled components, it is worthwhile to understand the specifics of the premium parts market. You can find more about the advantages of using used, original components in higher-class cars in the article: Used Mercedes Parts – Original Parts from Dismantling, which helps to better understand how to safely use second-hand OEM components.