Multifunction BSI (Body Systems Interface) control unit for the Peugeot 607. This Lear BSI D1B-00 module manages multiple comfort and body functions on PSA vehicles and is typically sought by professional technicians and experienced DIY mechanics by its reference numbers. The unit is supplied with the original manufacturer references: 9654696080, 6580Q8 and 6580Q9.

What The BSI Does

The BSI is the central body control unit that coordinates non-engine electrical systems: central locking, interior lighting, wipers, washer pumps, power windows, alarm and some instrument cluster signals. It acts as a communication gateway between switches, sensors and other control modules, ensuring correct distribution of signals and power for comfort functions.

Common Failure Modes And Causes

• Electrical faults from moisture ingress or corrosion on connector pins.
• Voltage spikes or poor battery/alternator condition causing degraded components inside the module.
• Intermittent failures due to cracked solder joints or aged capacitors on the circuit board.
• Physical damage from impact or improper prior installation.

Replacement, Installation And Notes

Locate the BSI unit on the Peugeot 607 behind the glovebox or under the passenger side dash (access varies by model year). Before removal always disconnect the vehicle battery to avoid shorts. Replacement steps typically include removing trim panels, unplugging the multi-pin connector(s), unfastening the module and refitting the new unit in reverse order.

Important: After fitting a new or exchanged BSI the vehicle may require synchronization and/or programming (immobiliser and key matching, and module configuration) using an appropriate diagnostic tool (e.g., manufacturer-level software). If you are a DIYer, plan for access to a professional diagnostic service to complete coding if necessary.

Durability And What To Check Before Ordering

• Confirm exact part numbers stamped on the existing module (9654696080, 6580Q8, 6580Q9, D1B-00) to ensure compatibility.
• Inspect connector pins for corrosion and wiring harness condition before replacing the unit.
• If intermittent faults occur, perform a battery/charging system test first to rule out voltage-related damage.

Technical Information

Manufacturer: Lear
Model: Peugeot 607
Product Codes: 9654696080, 6580Q8, 6580Q9
Additional Numbers: D1B-00

Who Should Buy This

This BSI is intended for professional auto electricians, workshop technicians and experienced DIY mechanics who repair Peugeot 607 vehicles. It is commonly searched by its part numbers, so please verify codes against your vehicle before purchase.

If you need guidance on fitment or post-installation programming, contact your diagnostic or service provider for model-specific procedures to ensure full functionality after replacement.