This used LEAR D1B-00 BSI (Body System Interface) is a direct-fit comfort/electronics control unit for the Peugeot 607. Supplied with known product codes 9648051180 / 6580K2 / D1B-00, the unit restores control over central locking, interior lighting, convenience features and communication with other vehicle modules. Ideal for professional workshops and experienced DIY mechanics who search by part number to quickly identify the correct replacement for fault diagnosis and repair.

Technical Information

• Manufacturer: LEAR
• Model: Peugeot 607
• Product Codes: 9648051180; 6580K2; D1B-00
• Other Numbers: D1B-00 (alternate marking)

Function And Typical Applications

The BSI (Body System Interface) acts as the central comfort electronics unit on PSA vehicles. It manages and coordinates functions such as central locking, interior and exterior lighting logic, wiper/washer control, alarm and immobilizer interfaces, keypad/console inputs and data exchange with the instrument cluster and engine ECU. Replacing a faulty BSI often resolves intermittent central-lock failures, unexplained lighting faults, non‑working wipers or erratic interior electronics behavior.

How The Unit Is Replaced

General replacement steps for experienced technicians or competent DIYers:

• Disconnect The Battery Before Any Work To Avoid Short Circuits Or Damage To Electronics.
• Access The BSI Module (Typically Located In The Passenger Compartment; Often Behind The Glovebox Or Under The Dashboard). Remove Trim Panels To Reach The Unit.
• Carefully Unplug All Electrical Connectors And Release Any Retaining Clips Or Bolts.
• Fit The Replacement Unit, Reconnect All Connectors Securely And Reassemble Interior Trim.
• Perform Required Coding Or Data Transfer/Cloning (See Installation And Coding – Important).

Installation And Coding – Important

• Unit Is Used And Is “Paired” With The Original Vehicle (VIN/PIN/Keys).
• Commissioning Options:
  1. Cloning Data From The Old Unit (EEPROM/Flash) – After Cloning The Unit Is Plug And Play.
  2. 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 Manufacturer Procedures To Avoid Damaging The Unit.

Recommendations For Installation

Handle The Unit And Connectors Carefully. Inspect Connector Pins And Wiring Loom For Corrosion Or Damage Before Reuse. Replace Any Faulty Fuses And Check Grounds During Installation. If Cloning Is Chosen, Ensure A Full And Verified EEPROM/Flash Copy. After Coding, Verify All Comfort Functions And Immobilizer Operation Before Returning The Vehicle To Service.

Why This Part Fails Most Often

• Water Ingress Or Moisture Causing Corrosion On Circuitry Or Connectors.
• Electrical Surges, Short Circuits Or Poor Grounding Leading To Component Damage.
• Thermal Stress And Aging Of Solder Joints Or Electronic Components.
• Software Corruption Or Memory Faults Requiring Cloning Or Reinitialization.

If you are searching by part number (9648051180, 6580K2, D1B-00), this LEAR BSI is supplied to meet Peugeot 607 comfort electronics repair needs. Suitable for professional fitment and for skilled DIYers familiar with module coding and PSA diagnostic procedures.

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.