Description
BSM B3 Siemens Citroën Peugeot 9643498880. This is a used part with a functional warranty. Some mounting tabs may be damaged – this does not affect functionality.
The BSM B3 (Body System Module) manufactured by Siemens is an essential body control unit for many Citroën and Peugeot models. This unit centralizes multiple electrical functions such as lighting circuits, wiper control, central locking, power windows and monitored fuses. Supplied as a used, tested-for-functionality module with visible mounting wear possible, it is often searched by its part number 9643498880 or alternative codes 9643498880-00 / T118470003 / 6500Y3.
Technical Information
- Manufacturer: Siemens
- Model(s): Citroën Berlingo, Citroën C2, Citroën C3, Citroën C3 Pluriel, Citroën C5, Peugeot 206, Peugeot Partner
- Product Codes: 9643498880, 9643498880-00, T118470003
- Other Numbers: 6500Y3
Compatibility And Identification
Technicians and DIYers commonly find this BSM by entering its part number (9643498880) or one of the variants above. The unit fits a range of PSA-platform vehicles from Citroën and Peugeot listed in the Technical Information. Always compare product codes printed on the original module when replacing electrical control units.
Function And Symptoms
The BSM B3 coordinates many body electrical systems. Typical symptoms of a failing BSM include intermittent or complete loss of central locking, nonfunctional indicators or interior lights, erratic wiper operation, blown circuits, or multiple electrical faults appearing simultaneously. Because the BSM aggregates numerous functions, failures are often felt as multiple unrelated issues.
Replacement Procedure
- Always Disconnect The Battery Before Starting Work To Avoid Short Circuits Or Damage To The Unit.
- Locate The Unit—typically mounted under the dashboard or behind trim panels near the central fuse box or passenger footwell. Exact location depends on model and year.
- Remove Trim Panels And Any Obstructing Parts Carefully To Access The Module.
- Unscrew Fastenings And Carefully Disconnect Electrical Connectors. Note Connector Positions For Reassembly.
- Install The Replacement Module, Reconnect Connectors, Refit Fastenings And Trim, Then Reconnect The Battery.
- After Installation, Verify Functions Such As Central Locking, Lights, Wipers And Window Operation. If Any Function Remains Faulty, Check Fuses, Grounds And Connector Contacts.
Recommendation For Installation
Perform Replacement In A Clean, Dry Environment. Inspect Connectors For Corrosion And Clean Contacts If Necessary. Use Correct Tools And Torque For Fastenings. When diagnosing, start with fuses and grounds before replacing the module. If you have diagnostic equipment, read stored fault codes to narrow faults to wiring, sensors or the BSM itself.
Why This Part Commonly Fails
Common Causes Of BSM Failures Include Moisture Ingress And Corrosion, Electrical Overloads Or Voltage Spikes, Thermal Stress From Long-Term Use, And Poor Connector Contacts. Physical Damage To Mounting Tabs May Occur During Previous Repairs Or Removal, But Cosmetic Damage To Brackets Does Not Affect Electrical Functionality.
Notes For Professional Use
This unit is supplied used with a functional warranty. It is popular among professional mechanics and skilled DIY enthusiasts as a cost-effective replacement for malfunctioning body control modules. Search By Part Number 9643498880 For Fast Identification On Parts Databases And Catalogues.
