Description
Side impact sensor (crash sensor) for Citroën and Peugeot vehicles.
This side impact sensor listed under reference numbers 9636982680 / 8216H3 is a direct-fit replacement used on a range of Citroën and Peugeot models. It restores reliable side-collision detection for the Supplemental Restraint System (SRS), ensuring airbags and seatbelt pretensioners deploy correctly in the event of a side impact. Ideal for professional workshops and experienced DIY mechanics who need an exact-match part often searched by product code.
How the Sensor Works
The sensor detects sudden lateral acceleration from a side impact and sends a signal to the Airbag Control Unit. That signal is used to determine crash severity and to trigger the appropriate restraint devices within milliseconds. A faulty sensor can cause the SRS warning light to illuminate and may disable side-airbag deployment or record fault codes in the control unit.
Replacement Procedure (Overview)
- Safety First: Disconnect the negative battery terminal and wait at least 10 minutes to allow the airbag system capacitors to discharge before working on SRS components.
- Access: Remove interior trim panels or door inner cover to reach the sensor—common mounting locations are the B-pillar area or inside the door structure depending on model.
- Disconnect: Unplug the sensor electrical connector, taking care not to damage locking tabs or wiring.
- Remove: Unscrew the retaining bolts and remove the sensor from its bracket or mounting point.
- Install: Fit the new sensor in the same orientation, secure bolts to manufacturer torque specification, and reconnect the wiring harness.
- Reset: Reconnect the battery and use a diagnostic tool to read and clear SRS fault codes, then confirm the SRS warning light extinguishes and no new faults appear.
Typical Failure Causes
Side impact sensors generally fail due to mechanical damage from a previous collision, water ingress and corrosion of connectors, wiring harness damage, or internal electronic fault after many years of service. Sensors rarely fail without an event or environmental exposure; after accidents they should be inspected and replaced if damaged or faulted.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën Berlingo, Citroën C5, Citroën Xsara, Citroën Xsara Picasso, Peugeot 206, Peugeot 407, Peugeot Partner
- Product Codes: 9636982680, 8216H3
- Other Numbers: 550903000 NFP
Installation Recommendations
- Always follow the vehicle manufacturer’s service manual for disassembly, torque values and safety intervals.
- Handle the sensor and connector carefully; avoid impacts, excessive bending of the harness, and contamination of contacts.
- Use an appropriate diagnostic scanner to confirm correct communication with the Airbag Control Unit and to clear any stored fault codes after replacement.
- If the vehicle has been in a collision, inspect surrounding structure, mounting brackets and wiring for hidden damage before fitting the new sensor.
Why This Part Is Searched By Code
Crash sensors are commonly searched by OE or reference numbers (for example 9636982680 or 8216H3) because technicians need an exact-fit replacement to maintain safety system integrity. Including these numbers in the listing helps ensure a quick match and reduces workshop downtime.
