Description

This BSI (Built-in Systems Interface) Siemens unit is a central comfort and body control module designed for Peugeot 406 models. It manages multiple vehicle functions including central locking, interior lighting, indicators, wipers, window control logic and communication with other electronic control units. Offered part numbers and references make this unit searchable by technicians and DIY enthusiasts looking for a direct-fit replacement or a donor module for repair work.

Key Features And Benefits

• Direct replacement for the original BSI module used on Peugeot 406 vehicles.
• Supports core comfort functions: central locking, alarm, interior lighting, intermittent wipers, and body electrical distribution.
• Part numbers commonly used in searches (9640091280, S108551300 H, 658026) increase findability on marketplaces and search engines.
• Ideal for mechanics and competent DIYers familiar with module removal, wiring and vehicle coding procedures.

Function And Typical Symptoms

The BSI acts as a central gateway and logic unit for non-engine vehicle systems. When it malfunctions, common symptoms include intermittent or complete loss of central locking, failure of interior lights or courtesy functions, erratic wiper behavior, blown fuses related to comfort circuits, multiple dash warnings, or immobilizer/starting issues. Faults may present as permanent failures or intermittent electrical anomalies that are especially noticeable after moisture exposure or electrical events.

Installation Overview

Replacement requires careful handling: always disconnect the vehicle battery before starting and follow manufacturer procedures. The BSI is typically located inside the passenger compartment (often behind the glovebox or within the lower dashboard). Typical replacement steps:

• Disconnect negative battery terminal and wait per manufacturer recommendation.
• Remove trim panels to access the BSI and note connector positions.
• Unplug all wiring connectors, release any retaining clips and remove mounting screws/bolts.
• Install the replacement unit, reconnect all harnesses and secure the module in place.
• Complete required cloning or coding procedure (see Mounting and Coding section below) before returning the vehicle to service.

Mounting And Coding – Important

• The Unit Is Used And Is Paired With The Original Vehicle (VIN/PIN/Keys).
• Options To Bring Into Service:
  1. Cloning Data From The Old Unit (EEPROM/Flash) – After Cloning The Unit Is Plug And Play.
  2. Virginization And Subsequent Initialization/Telecoding Via DiagBox (Possibly Online) + Key Adaptation.
• Recommended To Be Performed By A Professional With PSA Service Equipment (DiagBox/Lexia/PP2000).
• Before Removal/Installation Always Disconnect The Battery And Follow Manufacturer Procedure To Avoid Unit Damage.

Technical Information

• Manufacturer: Siemens
• Model: Peugeot 406
• Product Codes: 9640091280, S108551300 H
• Other Numbers: 658026, 658026 NFP

Recommended To Keep In Mind

• Do not attempt coding or key adaptation without appropriate diagnostic tools and knowledge; improper coding can leave vehicle security systems inoperative.
• Handle the module as an electrostatic-sensitive device and avoid contact with PCB or connector pins.
• When replacing, inspect wiring looms and connectors for corrosion or damage—restoring good grounds and connector integrity often prevents repeat failures.

Most Common Failure Reasons

• Water ingress or moisture causing corrosion on connectors or internal circuits.
• Electrical surges, jump-start incidents or poor battery connections damaging internal electronics.
• Wear and thermal stress over time leading to solder joint failures or component degradation.
• Poor connector contacts and wiring faults causing intermittent behaviour or short circuits.

Who Should Fit This

Suitable for professional auto electricians, workshop technicians and experienced DIYers who have the necessary tools for safe removal, wiring checks and mandatory cloning/coding operations. If you plan to install this unit yourself, ensure you have access to appropriate diagnostic equipment for final configuration.

Search Tips

When searching for compatibility or spare units, use the part numbers 9640091280, S108551300 H and 658026 together with the vehicle model Peugeot 406 to quickly locate matching listings and donor modules.

Specifically compatible with models such as Citroën and Peugeot, this BSI D9 unit plays a crucial role in the vehicle’s comfort and electrical communications. It is particularly important for maintaining the functionality of essential features such as air conditioning, power windows, and lighting systems.

It is common for BSI units to fail due to electrical issues, water ingress, or wear over time. Regular checks and timely replacement can prevent major inconveniences and maintain vehicle performance.

Technical Information

• Manufacturer: Siemens
• Model: BSI D9
• Product Codes: 9639848980
• Additional Numbers: 658026, S110950100

This product is compatible with popular models such as the Citroën and Peugeot 406, and it is commonly identified by product codes 9640091380, S110950410, and 658026. When installing a new module, it is essential to follow proper procedures to ensure correct functionality. Generally, the replacement process can be completed by accessing the unit, disconnecting associated wiring, and then fitting the new module into place.

BSI modules are known to fail due to factors like electrical surges, water ingress, or internal component degradation. Regular inspections and timely replacements are essential for maintaining the longevity and reliability of other electrical systems within your vehicle.

Technical Information

• Manufacturer: Siemens
• Model: BSI D9
• Product Codes: 9640091380
• Other Numbers: 658026, S110950410