Description
Airbag Control Unit For Citroën C4 Picasso
Fully Functional
This Airbag Control Unit (SRS Control Module) is a direct-fit replacement for Citroën C4 Picasso vehicles referenced by the listed part numbers. It is ideal for professional workshops and skilled DIY mechanics who search parts by product code. The unit monitors crash sensors, seatbelt buckle switches and airbag circuits, and commands deployment in the event of an impact. Supplied as fully functional and ready for installation, it restores proper SRS operation and resets the airbag warning when installed and diagnosed correctly.
Key Benefits
– Restores Correct Airbag System Functionality: Reinstates deployment logic and fault monitoring to ensure occupant protection systems work as intended.
– Direct Fit By Part Number: Commonly searched using part numbers such as 9664217980, making it quick to locate and order.
– Time-Saving For Workshops: Eliminates long vehicle downtime when matched to the correct model and product code.
How The Unit Works
The Airbag Control Unit (SRS Module) continuously reads inputs from accelerometers, impact sensors, occupant detection systems and seatbelt sensors. When a collision above threshold is detected, the module triggers the appropriate restraint devices (airbags, pretensioners) within milliseconds. It also stores fault codes and event data that can be read with a diagnostic tool to determine system status and crash history.
Replacement Procedure (Overview)
Replacing the Airbag Control Unit requires attention to safety and correct diagnostic follow-up. Typical steps performed by a trained technician or experienced DIYer:
- Disconnect The Battery: Always disconnect the negative battery terminal and wait at least 10 minutes (manufacturer recommendations may vary) to allow SRS capacitors to discharge.
- Remove Interior Trim Panels: Access the unit (commonly located under the center console or beneath the passenger seat depending on model) and unbolt the SRS module.
- Disconnect Electrical Connectors: Carefully release locking tabs and remove connectors. Inspect harness and connectors for corrosion or damage.
- Install The Replacement Unit: Secure the new unit in position, reconnect all plugs and refit trim components.
- Diagnostic Check And Reset: Use a suitable diagnostic tool to clear stored SRS faults and confirm system readiness. If the unit requires coding or adaptation, perform these steps with PSA-compatible equipment to ensure full functionality.
Installation Recommendation
Perform Installation With Care: Follow vehicle manufacturer procedures for SRS work. If deployment has occurred previously, or if the module contains stored crash data, professional diagnostics are recommended. After installation, verify that the airbag warning lamp goes out and that there are no stored SRS faults. Use an appropriate diagnostic scanner to read event memory and confirm the system is fully operational.
Most Common Causes Of Failure
– Impact Damage: Unit May Be Damaged Or Locked After A Collision; Event Data Can Prevent Normal Operation Until Cleared Or Replaced.
– Water Ingress Or Corrosion: Moisture Reaching Connectors Or Module Can Cause Intermittent Faults Or Permanent Failure.
– Electrical Problems: Short Circuits, Damaged Wiring Harnesses Or Poor Grounds Cause Fault Codes And Lamp Illumination.
– Physical Damage: Connector Pins, Mounting Points Or PCB Damage From Improper Handling.
Technical Information
- Manufacturer: Stellantis / Citroën / Peugeot
- Model: Citroën C4 Picasso (Applicable To Vehicles Using The Listed Part Numbers)
- Product Codes: 9664217980, 603474700
- Other Numbers: 6546A8, 6546A9, NFP
Note: The Unit Is Supplied As Fully Functional. Always Follow Safety Procedures When Working With SRS Components, Including Battery Disconnection And Use Of Correct Tools. For coding or advanced adaptation, use a professional diagnostic tool compatible with PSA systems.
