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.

BSI D9 SIEMENS (BODYS SYSTEMS Interface) with code 9637436380 and manufacturer Siemens S108551300 C. It is a control unit of comfortable functions removed from the Peugeot 406. Survents, wipers, lighting and communication with other control units over the VAN/CAN network.

This version of the BSI D9 is designed for selected equipment configuration of the 406 model (varies according to the year of production and electrical equipment). Always compare the complete label on the label (9637436380, S108551300 C) and the connectors with the original unit. The correct match of the codes significantly increases the chance of plug-and-play compensation after the corresponding coding.

Typical manifestations of defects in the original BSI in the Peugeot 406 include non -functional or spontaneously breeding direction indicators, wipers, interior lighting, central locking problems or impossibility of starting due to the immobilizer. A common cause is moisture, corrosion of pins or internal relays. Many of these problems can be removed by replacing the unit.

Installation and commissioning: BSI is located in the interior at the fuse box under the instrument panel. Always turn off the ignition before dismantling, close the door, wait for the network to fall asleep (for a few minutes), and then disconnect the battery. After physical replacement, it is necessary to configure the parameters and pair the immobilizer/keys through the diagnostics of the PSA (PP2000/diameter). In some cases, it is necessary to transfer data from the original unit (EEPROM) or BSI to “revive” to an empty condition – choose the procedure according to the equipment and practice on the model.

To ensure compatibility, we recommend: verify parts numbers on the label, compare the number and colors of connectors, take into account the equipment of the vehicle (fog lights, alarm, remote control, instrument type). In case of doubt, compare the parameters according to VIN. Proper pairing BSI with ECU and keys is key to functional immobilizer and starting.

technical information

• Manufacturer: Siemens (PSA BSI)
• Model: Peugeot 406 (selected versions according to equipment and year of production)
• Product codes: 9637436380; S108551300 C
• Other numbers: BSI D9; Variant “C”

If you are looking for a replacement under the codes 9637436380 or S108551300C for Peugeot 406, this BSI D9 Siemens is the right choice. Thanks to the original part, you maintain the full functionality of comfort systems and minimize the need for intervention in wiring.