Product Overview

This Autoliv airbag control unit (SRS ECU) is designed for Peugeot 307 vehicles and is commonly referenced by OEM numbers such as 9654491180, 606877300, 6545HK and 6545HJ. The unit monitors crash sensors, controls airbag and seatbelt pretensioner deployment, and stores fault and event memory. It is a component aimed at professional mechanics and experienced DIY enthusiasts who service Peugeot 307 vehicles; many customers search using the product codes listed above.

Technical Information

• Manufacturer: Autoliv
• Model: Peugeot 307 (First Generation / 307 I)
• Product Codes: 9654491180, 606877300
• Additional Numbers: 6545HK, 6545HJ

Compatibility

Fits Peugeot 307 first generation (307 I) variants that use the listed OEM numbers. Always verify the unit number stamped on the original module against the product codes above to ensure correct match for your vehicle.

Function And Value

The airbag control unit is the central element of the Supplemental Restraint System (SRS). It continuously evaluates input from accelerometers, impact sensors and seatbelt buckle sensors to decide if and when to deploy airbags and pretensioners. In addition to deployment control, the unit logs errors and crash events, which is essential for diagnostics after an impact. Replacing a faulty SRS ECU restores correct system behavior and clears persistent airbag warning lights when properly reset and coded.

How Replacement Is Performed

Replacement should be carried out by a qualified technician or a competent DIYer familiar with SRS systems. Basic high-level steps:

• Disconnect the negative battery terminal and wait at least 3 minutes to allow the system capacitors to discharge.
• Remove the necessary trim panels or seats to access the control unit (location varies by model and specification).
• Unplug multi-pin connectors carefully and unbolt the unit from its mounting.
• Install the replacement unit, reconnect connectors and fasten to the correct torque where applicable.
• Use a compatible diagnostic tool to clear stored SRS faults, verify sensor inputs and confirm the airbag system status. Ensure the airbag warning lamp extinguishes after reset.

Installation Recommendations

• Always disconnect the battery before beginning work and follow manufacturer safety procedures.
• Handle the control unit and airbag connectors with care to avoid bending pins or contaminating contacts.
• Do not attempt to power the unit outside the vehicle or with improvised wiring — use proper diagnostic equipment to verify operation and clear codes.
• After installation, perform a full SRS system check with a professional diagnostic tool to ensure no remaining fault codes and correct communication with other control modules.

Why This Part Most Commonly Fails

• Activation in a Collision: Units that have recorded a deployment event are typically non-functional afterward or store crash data and error codes.
• Electrical Damage: Voltage spikes, short circuits or improper jump-starting can damage internal electronics.
• Corrosion and Moisture Ingress: Water penetration or corrosion at connectors can lead to intermittent faults or complete failure.
• Connector Damage Or Poor Repairs: Damaged pins, improper reconnection after repairs or incorrect handling during interior work can cause communication errors.

Notes For Mechanics And DIYers

This product is intended for technicians who understand SRS safety procedures. Because the airbag control unit stores crash and fault information, always perform a full diagnostic scan after replacement. Searching by OEM number (e.g. 9654491180 or 606877300) will often yield the fastest match for compatibility when sourcing parts.