Description
Airbag control unit for Peugeot 406
Reliable airbag control unit compatible with Peugeot 406 models. This SRS (Supplemental Restraint System) module is listed under part numbers 9638592580, 550725200 and cross-references 6545JP, 6545JQ, 6545JL, 6545JN—making it easy to find by product code. Designed for professional mechanics and experienced DIYers, the unit processes crash sensors, stores fault codes and decides deployment of airbags and seatbelt pretensioners to protect occupants in the event of a collision. Buying a correctly coded and functioning airbag ECU is essential to restore full SRS functionality and to clear continuous airbag warning lights.
Technical Information
- Manufacturer: Stellantis (Citroën, Peugeot)
- Model: Peugeot 406
- Product Codes: 9638592580, 550725200
- Additional Numbers: 6545JP, 6545JQ, 6545JL, 6545JN
Fitment
Fits Peugeot 406 series (manufacture years 1995–2004) across common body styles including saloon, estate (station wagon) and coupe where the listed part numbers match. Always verify the part numbers when searching for compatibility.
Function
The airbag control unit (SRS ECU) monitors inputs from impact sensors, seat occupancy sensors and vehicle speed to determine if and when to trigger airbags and pretensioners. It records crash events and diagnostic trouble codes, drives the airbag deployment circuits and communicates SRS status to the instrument cluster (airbag warning lamp).
Installation Recommendations
- Disconnect the negative battery terminal and wait at least 10–15 minutes before working on the SRS system to allow stored energy in capacitors to dissipate.
- Work in a static-free environment and avoid touching connector pins directly to prevent electrostatic damage.
- Handle the unit carefully; secure all connectors and mounting points to original torque values and routing to avoid chafing or strain on wires.
- After installation, use an SRS-capable diagnostic tool to read and clear fault codes and to perform any required coding or initialization. Some vehicles may require module coding or configuration to match vehicle options.
- If the vehicle has been involved in a collision, ensure all related sensors, wiring and deployed components are inspected and replaced as necessary before reactivating the SRS system.
Most Common Failure Reasons
- Impact Damage: After a crash the unit can be locked or store fatal crash data and must be replaced or reconfigured.
- Water Ingress and Corrosion: Moisture in the passenger compartment or trunk area can corrode connectors and internal electronics.
- Electrical Faults: Short circuits, voltage spikes or poor grounding can damage the ECU.
- Connector/Wiring Damage: Frayed wires, loose pins or poor repair work can cause intermittent faults and SRS warning lights.
- Software/Memory Errors: Corrupted fault memory or internal software errors may trigger warning lamps and require professional diagnosis.
Symptoms of a faulty unit typically include a persistent SRS/airbag warning light on the dash, airbag faults recorded in diagnostics or loss of communication with the SRS module. For fast parts lookup, search by the listed product codes (9638592580, 550725200, 6545JP, 6545JQ, 6545JL, 6545JN).
Order this airbag control unit to restore the safety system on Peugeot 406 vehicles—engineered to integrate with original vehicle safety architecture and intended for fitment by qualified technicians or experienced DIYers with proper diagnostic tools.
