This Valeo BSI-BOITE B6 comfort control unit is a direct-fit electronic module designed for Citroën Xsara Picasso models. Ideal for professional workshops and experienced DIY mechanics, this used BSI unit restores centralised body functions such as lighting, locking, wipers, and interior electronics when the original module has failed. Commonly searched by part numbers (9642409480, 73002512, 73005812, 658038, 658072), the unit is supplied with the listed hardware and software identifiers to help you confirm compatibility from parts lists and repair manuals.

Technical Information

• Manufacturer: Valeo
• Model: Citroën Xsara Picasso (BSI-BOITE B6)
• Product Codes: 9642409480, 73002512
• Additional Numbers: 73005812, 658038, 658072
• Hardware: PR4
• Software: V8.2

Installation And Replacement

Replacing the BSI on a Xsara Picasso requires careful work under the dash. Typical replacement steps:

• Disconnect the negative battery terminal and wait a few minutes to ensure all capacitors discharge.
• Remove glovebox or lower dashboard trim to access the BSI housing (location varies by model year).
• Release connector locks and unplug all wiring harnesses from the unit.
• Unbolt the BSI from its bracket and remove it from the vehicle.
• Fit the replacement unit, secure bolts, reconnect harnesses and reassemble interior trims.
• Complete coding/initialisation procedure as required (see Mounting And Coding section below).

Mounting And Coding – Important

• The unit is used and is “paired” with the original vehicle (VIN/PIN/keys).
• Options for commissioning:
  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 (or online) + key adaptation.
• Recommended to be carried out by a specialist with PSA service equipment (DiagBox/Lexia/PP2000).
• Before removal/installation always disconnect the battery and follow the manufacturer’s procedure to avoid damaging the unit.

Recommendation For Installation

Perform coding and adaptation with proper PSA diagnostic tools whenever possible. If cloning is chosen, ensure a reliable EEPROM/Flash copy to preserve immobilizer and configuration data. Work in a static-free environment, avoid connector damage, and verify all ground points and battery voltage during the procedure. After installation, test all central functions (locking, lights, wipers, indicators, instrument cluster communication) before handing the vehicle back to the customer.

Most Common Failure Reasons

BSI failures on Xsara Picasso units typically result from water ingress and corrosion, electrical surges (charging system faults or poor battery connections), degraded solder joints due to thermal cycling, and age-related component wear such as failing capacitors. Symptoms often include random function loss, central locking issues, intermittent instrument cluster faults, and communication errors on the vehicle CAN network.

This listing is aimed at mechanics and competent DIYers who understand the need for correct handling and commissioning of comfort modules. Use the part numbers and hardware/software identifiers above to match the unit to the vehicle specification before installation.