Description
BSC A02-00 Siemens VDO for Citroën and Peugeot vehicles. It is from a Peugeot 407.
This BSC A02-00 control unit from Siemens VDO is a body electronics module used on Citroën and Peugeot vehicles. Supplied with OEM references 9655471980 and S120017003H, the unit controls multiple convenience and comfort functions and is a common replacement part for vehicles such as the Peugeot 407. Designed for professional repair shops and experienced DIY mechanics, this listing highlights compatibility by product codes and practical information for safe replacement and commissioning.
Function And Benefits
The Body Systems Controller (BSC) / Body Control Module centralizes control of vehicle convenience systems: central locking, interior and exterior lighting, wiper and wash systems, alarm/immobilizer interfaces and various body-related sensors. Replacing a faulty unit restores correct operation of these systems, removes warning messages, and resolves intermittent electrical faults caused by a degraded module.
Signs Of Failure
- Intermittent or non-functioning central locking and electric windows.
- Erratic interior or exterior lighting, dashboard warnings related to body electronics.
- Problems with immobilizer or no-start conditions linked to convenience electronics.
- Unresponsive switches or sudden loss of several body functions at once.
Why The Part Fails Most Often
Common causes of BSC failure include moisture ingress and corrosion of connector pins, voltage spikes or poor battery/alternator regulation, thermal stress and aging of internal components, and accidental damage during previous repairs. Faulty grounding and loose connectors accelerate deterioration. Correct diagnosis should include visual inspection of connectors and vehicle power supply before replacement.
Installation Recommendation
Before removing the unit, always disconnect the vehicle battery and follow the manufacturer’s removal procedure to avoid damage. Mount the replacement unit in the original bracket, secure all fasteners, and ensure connectors are fully engaged and corrosion-free. After mechanical installation, coding or data transfer is usually required to restore full functionality—see the coding instructions below.
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 Becomes Plug And Play.
- Virginization Followed By Initialization/Telecoding Via DiagBox (Or Online) + Key Adaptation.
- Recommended To Be Performed By A Technician With PSA Service Equipment (DiagBox/Lexia/PP2000).
- Before Removal/Installation Always Disconnect The Battery And Follow The Manufacturer Procedure To Avoid Damaging The Unit.
Technical Information
- Manufacturer: Siemens VDO
- Model: BSC A02-00
- Product Codes: 9655471980, S120017003H
- Other Numbers: A02-00
How The Unit Is Replaced (Basic Guide)
- Disconnect the negative battery terminal and wait a few minutes.
- Remove trim panels to access the module (typically located behind dashboard or glovebox depending on model).
- Unplug electrical connectors and release any locking tabs; document connector positions if needed.
- Unscrew mounting bolts and remove the old unit. Inspect connectors and wiring for corrosion or damage.
- Install the replacement unit, secure bolts, reconnect all connectors and reassemble trim.
- Perform cloning or coding as required (see Installation And Coding – Important above) and verify all functions in a test drive.
Compatibility Note
This unit originates from a Peugeot 407 and carries the listed product codes. It is compatible with Citroën and Peugeot vehicles using the same module references. Verify compatibility by matching product codes with the vehicle parts list or manufacturer documentation before installation.
Summary
If your Peugeot or Citroën exhibits multiple simultaneous body-electronic faults, replacing the BSC A02-00 Siemens VDO with a correctly coded unit often resolves the issues. For safe and reliable commissioning, cloning or professional coding using PSA diagnostic tools is strongly recommended.
