This BSI (Body System Interface) unit BSI04EV K04-00 is a genuine control module used on Stellantis vehicles such as Citroën and Peugeot. It centralizes comfort and body electronics functions—lighting, central locking, wipers, interior electrics and communication with other control units. The unit is commonly searched by product numbers (9664059080, 6580SS, 657062, 28120836-4, 28119248-3) and is suitable for Peugeot 407 applications equipped with the BSI04EV K04-00 specification. Designed for professional workshops and experienced DIYers, this module helps restore full body-electronics functionality when the original BSI fails.

Technical Information

• Manufacturer: Johnson Controls (used on Stellantis Citroën/Peugeot)
• Model: Peugeot 407
• Product Codes: BSI04EV, K04-00, 9664059080
• Additional Numbers: 01, 6580SS, 657062, 28120836-4 (BOOT), 28119248-3 (HARD)

Function And Typical Applications

The BSI is the central comfort and body electronics control unit. It manages lighting, interior and exterior switches, central locking, wipers, alarm and communication with other ECUs. On Peugeot 407 vehicles it acts as a gateway for multiple subsystems and coordinates inputs from switches and sensors to activate relays and outputs.

How The Unit Is Replaced

• Disconnect the negative battery terminal before any work to avoid short circuits or data corruption.
• Remove lower dashboard trim panels to access the BSI module—location varies by model year but is commonly behind the glovebox or under the dash on the passenger side.
• Unplug electrical connectors carefully, release retaining clips and remove mounting screws.
• Install the replacement BSI in reverse order, ensuring connectors and grounds are clean and fully seated.
• After mechanical installation, verify functionality and read fault codes with a diagnostic tool. Programming or synchronization of the immobilizer/keys may be required using manufacturer-level diagnostics (e.g., DiagBox/Lexia) to restore full vehicle communication.

Installation Recommendations

• Always Disconnect Battery And Observe ESD Precautions: Protect the module from static discharge and avoid handling circuit board contacts.
• Mark Connectors And Take Photos Before Removal: Helps ensure correct reconnection and reduces reassembly time.
• Check Fuses And Ground Points: Failures are often accompanied by blown fuses or poor grounds—inspect and rectify before fitting a new module.
• Use A Diagnostic Tool After Fitment: Clear fault codes, run actuator tests and, if needed, perform key/immobilizer synchronization or BSI coding with manufacturer-level software.
• Avoid Powering The Unit With Loose Connectors: Ensure all connectors are fully engaged before reconnecting the battery.

Why This Part Most Commonly Fails

• Moisture Ingress And Corrosion: Water leaks or condensation can corrode connector pins and PCB tracks.
• Electrical Surges And Poor Battery Connections: Voltage spikes or unstable power supply damage internal electronics.
• Connector Wear And Vibration: Repeated vibration or loose connectors cause intermittent faults or broken contacts.
• Age-Related Electronic Component Degradation: Over time relays, capacitors and solder joints can fail, especially in high-heat environments.

This BSI unit is ideal for mechanics and experienced DIYers who need an original-spec control module for Peugeot 407 vehicles using the BSI04EV K04-00 variant. Verify the product and additional numbers listed in the Technical Information to ensure correct fitment for your vehicle before installation.

You are in the right place to purchase used auto parts for Citroën and Peugeot! This specific product, the BSI unit (Body System Interface), is an essential control element for the proper functioning of your vehicle’s electrical and electronic systems.

The use of this particular unit is for the Citroën C5 X7 model, manufactured from 2009 onwards. It is a part that often requires replacement due to wear or damage, highlighting the importance of its proper functioning for overall comfort and safety of the vehicle. BSI units ensure that various electronic components of the car, such as lighting, central locking, or audio systems, communicate correctly and without faults.

Technical Information:

• Manufacturer: Johnson Controls
• Model: Citroën C5 X7
• Product Codes: 9664059080, 02, 6580SS, 6580SV, 657062

This unit is not only practical, but thanks to its compatibility with certain versions of the Citroën C5 X7, you can be assured that installation will proceed smoothly and without complications. A suitable mechanic or advanced amateur with experience in automotive electrical installations should perform the replacement.

By purchasing this auto part, you gain quality that supports the functionality and safety of your vehicle. Remember, even used parts can provide excellent service, especially when sourced from a reliable provider and thoroughly inspected.

The BSI (Built-in System Interface) is integral for the functionality of various electrical components within the vehicle, such as lighting, climate control, and security systems. It can often fail due to factors such as electrical shorts, water ingress, or general wear and tear, which necessitates replacement. Regular checks and timely replacement can help prevent electrical issues and maintain vehicle performance.

When replacing the BSI unit, it is essential to ensure that the new unit is compatible with the specific model of the vehicle, and professional installation is recommended to avoid complications during connection and configuration.

Technical Information

• Manufacturer: Johnson Controls
• Model: BSI04EV K04-00
• Product Codes: 9664059080
• Additional Numbers: 1663370680, 657062, 657063, 28119248-3C, 28120836-4

As a critical electronic component, the BSI unit is responsible for various functions such as controlling the car’s climate system, lighting, and other electronic conveniences. Over time, wear and tear, as well as electrical issues, can lead to failures in these systems, making the BSI unit prone to malfunctions. Regular checks and timely replacements are recommended to maintain optimal vehicle performance.

Technical Information

• Manufacturer: Johnson Controls
• Model: BSI04EV K04-00
• Product Codes: 9664059080, 6580NP, 657062, 6580NQ
• Other Numbers: 966405908001

It’s important to replace the BSI unit if you experience issues such as malfunctioning electronic components or warning lights on your dashboard. For mechanics and DIY enthusiasts, replacing this unit is straightforward but may require specific tools and diagnostic equipment to ensure compatibility and correct installation.

As an automotive mechanic or a DIY car enthusiast, you will appreciate the importance of a well-functioning BSI unit. This device is responsible for managing comfort systems, including lighting, heating, and electronic system interactions, making it a crucial component in modern vehicles. The failure of BSI units can often be attributed to electrical faults, wear and tear, or software issues, which is why timely replacement is recommended.

Removing and replacing the BSI unit requires some technical knowledge. It involves disconnecting the battery, removing the dashboard, and ensuring all connections are properly managed to avoid electrical failures.

Technical Information

• Manufacturer: Johnson Controls
• Model: BSI04EV K04-00
• Product Codes: 9664059080, 02, 6580SV, 6580LJ, 657062, 6580SS
• Other Numbers: N/A