Description
BSC A04-00 SIEMENS VDO for Citroën and Peugeot vehicles. It is from a Peugeot 407.
Overview
This Siemens VDO BSC A04-00 control unit (Body/Comfort Module) is a vehicle electronics module used on selected Citroën and Peugeot models, most notably the Peugeot 407. The unit centralizes many comfort and body functions such as central locking, interior and exterior lighting logic, wiper and washer control, indicator and hazard management, and communication between vehicle networks. It is commonly referenced by OEM numbers and software IDs, which are often used when searching for a replacement part.
Why Mechanics And DIYers Choose This Unit
This part is sought after by professional technicians and experienced DIY enthusiasts looking to restore full comfort and electrical functionality after module failure. Searching by part number (e.g., 9656148180, S120017001H) is a common and efficient way to find the correct unit. The unit is compatible with diagnostic and programming tools used in PSA service environments.
Installation And Replacement
Replacing the BSC/BSI requires careful, methodical work. Typical replacement steps:
- Disconnect The Battery: Always disconnect the negative terminal before starting to avoid short circuits and protect the electronics.
- Access The Unit: The BSC is usually located behind the dashboard or under the glovebox; remove necessary trim and securing fasteners to reach the module.
- Unplug Connectors: Carefully release multi-pin connectors and locking tabs. Note connector orientation and any retaining clips.
- Remove And Install: Unscrew and remove the old unit, fit the replacement in the same position and secure fasteners.
- Reconnect And Test: Reconnect wiring harnesses and the battery, then perform initial function checks (locking, lights, wipers, instrument communication).
Final commissioning typically requires data cloning or coding to match the vehicle configuration (see Coding And Commissioning below).
Coding And Commissioning – Important
– The Unit Is Used And Is “Paired” With The Original Vehicle (VIN/PIN/Keys).
– Options For Commissioning:
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 Specialist With PSA Service Equipment (DiagBox/Lexia/PP2000).
– Before Removing/Installing Always Disconnect The Battery And Follow Manufacturer Procedures To Avoid Damaging The Unit.
Most Common Causes Of Failure
- Moisture Ingress And Corrosion: Water penetration or high humidity can corrode connectors and PCB traces.
- Electrical Disturbances: Voltage Spikes, Jump-Starts, Or Poor Battery Connections Can Damage Internal Electronics.
- Connector Wear Or Broken Pins: Repeated disassembly or poor connector mating causes intermittent faults.
- Age-Related Component Degradation: Over Time Capacitors And Solder Joints May Fail, Leading To Erratic Behavior.
Recommended Workshop Practices
- Perform Fault Diagnosis With A Proper Scanner To Confirm The BSC Is At Fault Before Replacement.
- If Possible, Clone EEPROM/Flash From The Original Unit For Faster Commissioning And To Preserve Vehicle-Specific Data.
- Use PSA-Approved Tools For Coding And Key Pairing To Ensure Full Functionality Of Locks, Alarms, And Remote Keys.
- Protect Connectors From Moisture And Ensure All Ground Points Are Clean And Tight To Prevent Recurrence.
Technical Information
- Manufacturer: Siemens VDO
- Model: Peugeot 407 (originally fitted)
- Product Codes: 9656148180, A04-00
- Other Numbers: S120017001H, 6580S9, 6580XF
Compatibility And Notes
This control unit is physically and electronically specific to vehicles equipped with the matching hardware and wiring harness. Compatibility is frequently verified by the part and software numbers printed on the unit itself. When replacing the module, pay attention to connector types and software identifiers to ensure compatibility.
Final Advice
If You Are An Experienced Technician Or A Skilled DIYer With Access To PSA Diagnostic Tools, This Siemens VDO BSC A04-00 Can Be Replaced And Commissioned To Restore Full Vehicle Comfort Functions. For Safe Handling And Reliable Commissioning, Follow The Manufacturer’s Service Procedures And Use The Recommended Diagnostic Equipment.
