Description
Comfort BSI Control Unit JOHNSON CONTROLS 2004 H05-01 Fits Citroën C4, C5 II and Peugeot 307, 407
Description
This BSI (Body Systems Interface) comfort control unit is an original-equipment style module manufactured by Johnson Controls for Stellantis vehicles. It manages central comfort and convenience functions such as central locking, interior lighting, wipers, power windows, door mirrors, alarm/immobiliser interface and many body electrical circuits. The unit is suitable for Citroën C4, Citroën C5 II and Peugeot 307 and 407 models and is commonly searched by OEM part numbers (e.g. 9661940480). The product is intended for professional workshops and experienced DIY mechanics who perform electrical repairs and ECU replacements.
Technical Information
- Manufacturer: Johnson Controls (Stellantis supplier)
- Model: Citroën C4; Citroën C5 II; Peugeot 307; Peugeot 407
- Product Codes: 9661940480, 1660728480, 6580KH, 6580KJ, 6580GK, 6580CW, 6580Y6, 6580Y5, 1660728780, 1660729180
- Additional Numbers: BOOT 21676031-5B; HARD 28117435-2A; NFP
Installation Recommendations
Always disconnect the vehicle battery before starting work on the BSI. Work on a clean, static-free bench if the unit is removed. Inspect connectors and wiring harness for corrosion or damage—repair any compromised wiring before installation. After mechanical installation, verify all fuses and relays related to body electronics. Coding or pairing is usually required for full functionality (see the Coding section below).
Installation and Coding – Important
- The unit is used and is “paired” with the original vehicle (VIN/PIN/keys).
- Options to bring the unit into service:
- Cloning data from the old unit (EEPROM/Flash) – after cloning the unit is plug and play.
- Virginisation and subsequent initialisation/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 damage to the unit.
Replacement Procedure
- Disconnect the negative battery terminal and wait a few minutes to ensure systems are powered down.
- Locate the BSI: typically positioned behind the dashboard/fusebox area on the driver side (consult vehicle repair manual for exact location).
- Remove surrounding trim panels and any securing brackets to access the unit.
- Carefully unplug multi-pin connectors and remove the mounting fasteners.
- Install the replacement unit, reconnect connectors, secure fasteners and reassemble trim.
- Perform required cloning or coding procedure and test all body functions (locking, windows, lights, wipers, immobiliser) before returning the vehicle to service.
Why It Fails Most Often
Common failure causes include moisture ingress and connector corrosion, voltage spikes or poor battery/charging system health, and internal solder joint fatigue (thermal cycling). Faulty wiring, water leaks into the passenger compartment, or aftermarket accessories wired incorrectly can also lead to premature BSI faults. Symptoms typically include intermittent or complete loss of central locking, non-functioning windows or lights, erratic behaviour of convenience systems, or communication errors on diagnostic tools.
Who Should Fit This Part
Recommended for professional auto electricians and experienced DIY mechanics familiar with vehicle coding and body electronics. Because pairing or cloning is normally required for full system operation, installation by a workshop with PSA diagnostic equipment is strongly advised for trouble-free commissioning.
Note
Search Keywords: BSI 9661940480, Citroën C4 BSI, Peugeot 307 BSI, Citroën C5 II BSI, Peugeot 407 BSI, Johnson Controls BSI.
Order this BSI control unit when you need a direct replacement identified by the above part numbers. Proper installation and coding restore full comfort and security functions and prevent recurring electrical faults.
