Description
BSI BSI04EV K04-00 Johnson Controls Citroën Peugeot
From 2010 Citroën C4 Grand Picasso
BOOT 28120836-4
HARD 28119248-3B
Overview
The BSI (Body Systems Interface) BSI04EV K04-00 is a comfort / central body control unit used in Citroën and Peugeot vehicles. Manufactured by Johnson Controls and fitted on selected Stellantis models, this module manages a wide range of vehicle convenience and safety functions such as central locking, interior lighting, wiper and washer logic, power windows, alarm and keypad/remote interactions. Technicians and DIYers commonly identify this part by its reference numbers and module code listed below.
What This Unit Does
This BSI acts as the central gateway for many low-voltage vehicle functions: it receives inputs from switches and sensors, processes the information and commands actuators or other modules. Typical responsibilities include managing door locks, interior lighting timing, remote key recognition, comfort delays, alarm triggers and sometimes CAN-bus communication handling between subsystems.
Fitment And Compatibility
Primary fitment: Citroën C4 Grand Picasso (from 2010) and closely related platform derivatives. The module is labeled with multiple manufacturer and product numbers (see Technical Information). Because BSI variants and software/hardware revisions exist, always compare the module codes listed in the Technical Information with the part fitted in the vehicle to confirm compatibility.
Replacement Procedure (General Guidance)
1. Preparation: Park the vehicle on a level surface, engage the handbrake and remove ignition key. Wear an anti-static wrist strap if available. Before any work on the BSI, disconnect the negative battery terminal to avoid short circuits and to protect the electronics.
2. Access: The BSI is typically located behind the glovebox or under the dashboard on the passenger side depending on the model. Remove trim panels or glovebox as required to gain clear access to the unit.
3. Disconnect: Carefully unplug electrical connectors—press release clips and avoid pulling on wiring. Note connector positions and retaining screws.
4. Swap Unit: Replace the module and re-fit connectors and fasteners. Reconnect the battery only after the module is mechanically secured.
5. Coding and Initialization: Most BSI replacements require cloning or coding to the vehicle (see Installation and Coding – Important). After vehicle-side procedures are completed, verify central locking, lights, windows and alarm functions before reassembling interior panels.
Installation And Coding – Important
- The Unit Is Used And Is “Paired” With The Original Vehicle (VIN/PIN/Keys).
- Options To Put The Unit Into Service:
- Cloning Data From The Old Unit (EEPROM/Flash) – After Cloning The Unit Is Plug And Play.
- Virginization And Subsequent Initialization/Telecoding Via DiagBox (Or Online) + Key Adaptation.
- Recommended To Be Performed By A Specialist With PSA Service Equipment (DiagBox/Lexia/PP2000).
- Before Removal/Installation Always Disconnect The Battery And Follow The Manufacturer Procedure To Avoid Damaging The Unit.
Why This Part Fails Most Often
Common failure causes include water ingress from leaking seals or sunroof drains, corrosion of connectors, electrical surges (battery disconnects performed incorrectly or jump-starting errors), and internal component wear after many years in service. Intermittent faults often present as erratic central locking, loss of remote functions, blown fuses, or multiple seemingly unrelated convenience features failing at once—typical signs of BSI malfunction or communication errors on the vehicle network.
Recommendations For Installation
Have access to proper diagnostic and coding tools when replacing a BSI. If cloning is chosen, ensure a verified full EEPROM/Flash dump is obtained from the original unit. If virginizing and coding, use DiagBox or an approved PSA solution and follow the exact initialization sequence. Always disconnect the negative battery terminal before work, avoid static discharge, and inspect connector pins for corrosion or damage. After installation, run a full vehicle scan and test all convenience functions before refitting trim panels.
Technical Information
Manufacturer: Johnson Controls / Stellantis Compatibility
Model: BSI04EV K04-00
Product Codes: 9664059080, 1663370780, 657064, K04-00
Additional Numbers: 28119248-3B, 28120836-4
Useful Notes For Mechanics
Search and ordering are commonly performed by the module reference numbers above. When diagnosing, check fuses and wiring integrity first—many faults attributed to the BSI are actually caused by power supply issues or poor ground connections. For coding and key adaptation follow PSA procedures and consider professional service for vehicles with immobilizer and key programming requirements.
