Description
BSI BSI04EV K04-00 Johnson Controls Citroën Peugeot From 2008 Citroën C4 Grand Picasso
BOOT 28120836-4
HARD 28119248-3B
Overview
BSI04EV K04-00 body control module (BSI) by Johnson Controls for Citroën and Peugeot vehicles is a commonly replaced comfort and central electronics unit. This unit controls lighting, central locking, wipers, interior electronics and communicates with the instrument cluster and immobiliser. It is often searched by part numbers such as 9664059080, 1663370780, 657064 or K04-00 — include these numbers when searching to locate the correct unit quickly. This description is written for professional technicians and experienced DIY mechanics who service Citroën/Peugeot vehicles.
Technical Information
- Manufacturer: Johnson Controls
- Model: Citroën C4 Grand Picasso (From 2008)
- Product Codes: BSI04EV, K04-00, 9664059080, 02 1663370780, 657064, 1663370780
- Other Numbers: BOOT 28120836-4, HARD 28119248-3B
Fitment And Compatibility
This BSI unit is fitted to Citroën C4 Grand Picasso models from around 2008 and to vehicles within the PSA group that use the BSI04EV K04-00 hardware. Compatibility must be confirmed by matching the unit’s part numbers listed above. Searching by the OEM numbers (9664059080, 1663370780, 657064) will help you find matching units and cross-references.
Function And Symptoms
The BSI (Body System Interface) is the central comfort electronics module. It manages functions such as central locking, interior and exterior lighting logic, wiper control, convenience features, and data exchange with the dashboard and immobiliser. Faulty BSI units commonly produce symptoms like intermittent or permanent loss of central locking, non-functional interior lights, erratic wiper behaviour, dashboard warning lights, immobiliser or starting problems, and multiple electrical anomalies that are otherwise hard to trace.
Replacement Procedure (Summary)
Replacement of the BSI typically involves these steps: disconnect the negative battery terminal before any work; remove relevant trim or glovebox to access the unit; unscrew mounting fasteners and carefully unplug multi-pin connectors; install the replacement unit and secure connectors; reconnect the battery and perform necessary coding/initialisation (see coding section). Handle the unit with ESD precautions and avoid connector pin damage. If the vehicle has immobiliser integration, additional steps for transponder/key adaptation may be required.
Installation And Coding – Important
- The Unit Is Used And Is “Paired” With The Original Vehicle (VIN/PIN/Keys).
- Options For Commissioning:
- Cloning Data From The Old Unit (EEPROM/Flash) – After Cloning The Unit Is Plug And Play.
- Virginisation And Subsequent Initialization/Telecoding Via DiagBox (Or Online) + Key Adaptation.
- Recommended To Be Performed By A Technician With PSA Service Equipment (DiagBox/Lexia/PP2000).
- Always Disconnect The Battery Before Removal/Installation And Follow Manufacturer Procedures To Avoid Damaging The Unit.
Installation Recommendations
Always isolate the battery negative before starting. Inspect and clean connector pins and earth points before fitting the new unit. Protect the module from static discharge and moisture. Tighten mounting bolts to original torque and ensure no wiring is pinched behind trim. After mechanical installation, perform the appropriate coding or cloning procedure using DiagBox/Lexia/PP2000 to restore full functionality.
Why This Part Fails Most Often
Common failure causes include water ingress and corrosion (especially in vehicles with compromised seals), thermal stress and solder joint fatigue, voltage spikes from poor battery/alternator regulation, and connector corrosion. Electrically induced damage from incorrect jump-starting or short circuits can also destroy internal components. Regular failure signs are intermittent electronics, sporadic central locking, or complete loss of certain comfort functions.
Notes For Mechanics And DIYers
When diagnosing BSI-related faults, always check fuses, grounds and connector integrity before replacing the module. If uncertain about coding or immobiliser adaptation, seek assistance from a technician equipped with PSA diagnostic tools. Use the listed part numbers to ensure you obtain the correct BSI04EV K04-00 version for the vehicle.
