Description
Comfort BSI Control Unit JOHNSON CONTROLS 2004 H05-01. Fits Citroën C4, C5 II and Peugeot 307, 407.
This BSI (Body Systems Interface) comfort control unit from Johnson Controls is a direct-fit replacement for a range of Stellantis Citroën and Peugeot models. It centralizes comfort and body functions such as interior lighting, central locking, wipers, window controls, alarm and certain convenience relays. The unit is commonly searched by part numbers (e.g. 9661940480, 1660728480) — include these when searching to improve match accuracy. Suitable for professional workshops and experienced DIYers who have access to the required diagnostic tools for coding and initialization.
Technical Information
- Manufacturer: Johnson Controls
- Model: BSI 2004 H05-01
- Product Codes: 9661940480, 1660728480, 1660728780, 1660729180
- Other Numbers: 6580KH, 6580KJ, 6580GK, 6580CW, 6580Y6, 6580Y5
- Boot / Bootloader: 21676031-5B
- Hardware Number: 28117435-2A
- Additional Info: NFP (as listed)
Compatibility
Fits the following models (typical applications): Citroën C4, Citroën C5 II, Peugeot 307, Peugeot 407. Always match the full part number and hardware/boot identifiers to the original unit before installation.
Function
The BSI centralizes multiple body and comfort functions: central locking, interior and courtesy lighting, wiper control signals, power window management, remote key functions, alarm interface and network gateways between vehicle buses. It also handles inputs from switches and sensors and controls relays for comfort features.
Common Failure Causes
- Moisture Ingress and Corrosion: Water or condensation entering the housing or connectors causes corrosion of PCB tracks and connector pins.
- Voltage Spikes/Battery Issues: Improper jump-starting, faulty alternator or sudden voltage surges can damage electronic components.
- Solder Joint Fatigue: Thermal cycling over years can cause cracked solder joints on the PCB, leading to intermittent faults.
- Connector Oxidation and Pin Damage: Poor contact at multi-pin connectors causes signal errors or power loss.
Replacement And Service Life
Service life varies with vehicle use and environment; units often fail after many years or high mileage, or following specific electrical incidents. When replacing, ensure the replacement unit matches part and hardware numbers. Expect that BSI replacement may require coding and initialization to fully restore all vehicle functions.
Installation Recommendations
- Disconnect the vehicle battery before starting any work to prevent short circuits and to protect the unit.
- Handle the unit with care—avoid static discharge and do not drop the module.
- Follow manufacturer removal procedures: typically access is via the central dash area or glovebox depending on model; remove trim panels and unscrew the BSI bracket, then carefully unplug all connectors.
- Inspect wiring harness and connectors for corrosion or damage; repair any issues before fitting the new unit.
- After mechanical installation, the unit will usually require coding/initialization to the vehicle to restore all functions.
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.
- Virginization 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 the manufacturer’s procedure to avoid damaging the unit.
Why This Part Is Often Replaced
BSI units are central to many vehicle functions, so any intermittent faults or failures can produce loss of multiple systems (locking, lighting, windows, alarm). Because they sit in the passenger compartment and rely on many connectors and internal soldered components, they are susceptible to moisture, connector corrosion and thermal stress — making replacement a common repair when symptoms appear.
Notes For Buyers
When searching or ordering, use the full part numbers listed under Technical Information to find the correct match for your vehicle. Reprogramming or cloning is usually required to restore full functionality; plan for diagnostic/coding time when scheduling the repair.
