Description
Side Impact Sensor (Crash Sensor) for Citroën and Peugeot Vehicles.
This Side Impact Sensor (Crash Sensor) is a direct-fit safety component for a range of Citroën and Peugeot models. It monitors lateral impacts and delivers rapid signals to the airbag control unit to trigger side airbags and seatbelt pretensioners when required. Commonly referenced by product codes 9636982680 and 8216H3, this sensor is an essential part of the passive safety system and is suitable for professional workshops and experienced home mechanics who maintain Stellantis vehicles.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Side Impact/Crash Sensor
- Product Codes: 9636982680, 8216H3
- Other Numbers: 550903000 NFP
Applications (Compatible Models)
Typical fitment includes various Citroën and Peugeot vehicles such as Citroën Berlingo, Citroën C5, Citroën Xsara, Citroën Xsara Picasso, Peugeot 206, Peugeot 407 and Peugeot Partner. Always confirm that the part number (e.g. 9636982680 / 8216H3) matches the vehicle’s original sensor to ensure correct fitment.
Function and Typical Location
The side impact sensor detects lateral acceleration and impact forces, sending an immediate signal to the airbag control module to deploy side and curtain airbags or activate seatbelt pretensioners. Depending on the model, sensors are typically mounted in the B‑pillar, door inner structure, or seat base area. Placement is chosen to provide reliable detection of side collisions while being protected from routine mechanical damage.
Common Failure Causes
- Physical Damage From Previous Collision Or Impact—Direct strikes can deform or destroy the sensor.
- Corrosion Or Water Ingress—Moisture and corrosion at the connector or housing can cause intermittent faults or total failure.
- Connector Or Wiring Faults—Loose plugs, broken wires, or poor grounding lead to error codes or loss of signal.
- Electrical Short Or Overvoltage—Aftermarket electrical work or jump-starting with incorrect procedures can damage the sensor electronics.
- Wear From Age—Electronic components can degrade over many years, producing fault codes even without visible damage.
Replacement Procedure
Suitable for experienced technicians or competent DIYers familiar with airbag systems. Typical replacement steps:
- Park the vehicle on a level surface, switch off ignition and secure the vehicle.
- Disconnect the negative battery terminal and wait the manufacturer recommended interval before working on the airbag system to avoid accidental deployment.
- Remove interior trim panels or seat components to access the sensor (location varies by model—B‑pillar, door inner, or seat base).
- Unplug the sensor connector and remove the mounting fasteners. Inspect wiring and connector for corrosion or damage.
- Fit the replacement sensor, secure with correct fasteners and torque, and reconnect the electrical connector ensuring proper contact.
- Reconnect the battery, then use a diagnostic tool to clear airbag crash codes and verify system status. On some vehicles the airbag control unit may require a reset or initialization.
- Reinstall trim and verify that no warning lights remain on the dashboard during a test drive.
Installation Recommendations
- Always Disconnect The Battery: Before removing or installing any airbag-related component, disconnect the battery and follow the manufacturer specified waiting time to discharge residual energy.
- Use Proper Tools And Torque Values: Secure mounting with the correct fasteners and torque to maintain sensor position and performance.
- Inspect Wiring And Connectors: Replace corroded pins or damaged wiring to prevent recurring faults.
- Diagnostic Verification: After replacement, clear fault codes with an appropriate diagnostic tool (e.g., DiagBox/Lexia) and confirm the airbag system reports no errors. Some models may require initialization or adaptation via diagnostic equipment.
- Safety First: If You Are Unsure About Any Step, Have Replacement Performed By A Qualified Technician—Airbag Systems Are Critical For Occupant Safety.
