This Autoliv airbag control unit (SRS ECU) is intended for Peugeot 407 vehicles and carries original equipment codes commonly searched by professionals: 9654717280, 603554600, 6545HY, 6545HZ. The module monitors crash sensors and seatbelt pretensioners, stores fault and crash data, and triggers airbag deployment in the event of a collision. It is suited for automechanics and experienced DIYers looking for a direct-fit replacement for the vehicle’s occupant restraint control.

Technical Information

• Manufacturer: Autoliv
• Model: Peugeot 407
• Product Codes: 9654717280, 603554600
• Additional Numbers: 6545HY, 6545HZ

Compatibility

Compatible with Peugeot 407 models equipped with the Autoliv SRS system. Use the listed product codes to match the unit to the vehicle’s original ECU. Confirming the code printed on the existing module ensures correct fitment.

Function And Typical Failure Modes

The airbag control unit continuously evaluates inputs from impact sensors, seat occupancy sensors and belt pretensioners. On detecting a qualifying impact, it sends deployment commands to the relevant restraint devices and logs event data to the control unit memory.

Common Causes Of Failure:

• Collision Event: Module can be damaged or store non-clearing crash data after an impact.
• Water Ingress Or Corrosion: Moisture in the cabin or poor sealing can corrode connectors or internal electronics.
• Electrical Surges Or Short Circuits: Faulty wiring, jump-starts or battery issues can damage internal components.
• Connector Damage Or Poor Contact: Broken pins or contaminated plugs lead to intermittent faults and error codes.

Replacement Procedure

Basic Steps For Mechanics And Experienced DIYers:

• Disconnect Negative Battery Terminal And Wait: Remove negative battery cable and wait at least 10–15 minutes to allow SRS capacitors to discharge before touching the unit.
• Locate The Unit: The ECU location varies by vehicle specification; it is commonly installed in the passenger compartment (under the center console, under the passenger seat or behind the glove box). Remove any trim panels or mounts to access the module.
• Carefully Unplug Connectors: Release locking tabs and unplug wiring harnesses. Inspect connectors and wiring for damage or corrosion.
• Replace Unit And Reconnect: Fit the replacement unit in the original position and reconnect harnesses securely.
• Diagnostic Reset: Use an SRS-capable diagnostic tool to clear fault memory and verify system status. Ensure the airbag warning lamp extinguishes and no active SRS faults remain.

Installation Recommendations

• Follow Safety Precautions: Always disconnect the battery and wait the recommended time before starting work to avoid accidental deployment.
• Use Proper Diagnostic Tools: Clearing crash data and resetting the airbag light typically requires a professional SRS diagnostic scanner.
• Inspect Connectors And Wiring: Repair any damaged pins, harness insulation or corroded contacts before installing the new unit.
• Secure Mounting: Ensure the unit is mounted exactly as the original to avoid vibration-related faults.

Lifespan And Reliability

Airbag control units are designed to last for the life of the vehicle under normal conditions. Failures are relatively rare and are most often associated with prior collisions, water damage, or electrical faults. Replacing the module without addressing root causes (corroded connectors, leaking seals, or wiring shorts) may result in recurring faults.

Why Choose This Unit

This Autoliv unit carries original equipment references commonly used in workshop searches, making it a practical option for technicians who need a direct replacement part with known product codes. Proper installation and post-replacement diagnostics will restore correct restraint system operation.

This Autoliv airbag control unit is a direct-fit safety module designed for use in Peugeot 407 vehicles. It monitors crash sensors, decides when to deploy airbags and seatbelt pretensioners, and stores diagnostic fault codes that illuminate the SRS warning lamp. The unit is commonly referenced by part numbers 9655880880, 603554600, 6545HY and 6545HZ, so customers and workshops frequently search by these codes when sourcing a replacement.

Application And Compatibility

Compatible With: Peugeot 407 models. Check vehicle equipment level and connector layout when comparing part numbers. This module is intended as the airbag/SRS control unit for the Peugeot 407 family.

Technical Information

• Manufacturer: Autoliv
• Model: Peugeot 407
• Product Codes: 9655880880, 603554600
• Additional Numbers: 6545HY, 6545HZ

Function And Benefits

The airbag control unit continuously monitors inputs from accelerometers, impact sensors, belt buckle switches and other SRS components. On detecting a qualifying collision, it sends deployment signals to the relevant airbag and pretensioner circuits. A properly functioning module ensures timely and correct activation of restraint systems, contributes to passenger safety and provides fault data for diagnostics.

Typical Fault Symptoms

Common indicators that the control unit may be faulty include a persistent SRS/Airbag warning light on the dashboard, stored crash or communication fault codes, intermittent loss of communication with diagnostic tools, or airbags/pretensioners not deploying after a crash. After an impact where airbags have deployed, the module often records the event and normally requires replacement.

Installation Recommendations

Installation Should Be Performed By A Qualified Technician Or An Experienced DIY Mechanic Familiar With SRS Systems. Before Starting, Disconnect The Battery And Wait At Least 10–30 Minutes To Allow The SRS Capacitor To Discharge. Follow These Steps: carefully remove trim panels to access the module, disconnect connectors using retention clips (avoid pulling on wiring), install the replacement unit ensuring secure connector engagement and correct alignment, reassemble trims, reconnect the battery and perform a full SRS system scan with a diagnostic tool to clear any residual fault codes and verify proper operation. Use appropriate torque values for fasteners and observe electrostatic discharge precautions when handling the module.

Why This Part Fails Most Often

Failure Causes Include Water Ingress Or Corrosion Of Connectors, Electrical Surges Or Short Circuits (for example after incorrect jump-starting), Physical Damage From Previous Collisions, Or Internal Component Failure Due To Age Or Thermal Stress. In many cases the module is also replaced after airbag deployment, since deployed-event data is recorded and reset is not possible in-service.

Notes For Buyers

Customers Often Search Using Part Numbers 9655880880, 603554600, 6545HY And 6545HZ — Include These Codes When Comparing Listings To Ensure Correct Fitment. After replacement, always perform a diagnostic check to confirm the SRS lamp is extinguished and there are no stored errors.