This airbag control unit (SRS ECU) is a direct-fit replacement for Citroën C1 and Peugeot 107 models, supplied as a fully functional, non-activated module with original part references. Designed for professional workshops and experienced DIY mechanics, this unit restores SRS system integrity after removal of a deployed or faulty module and ensures correct operation of airbags and seatbelt pretensioners when installed and commissioned properly. Commonly searched by part numbers 89170-0H040 and 6546F7, this item improves findability and helps technicians quickly identify the correct spare.

Technical Information

• Manufacturer: Stellantis (Citroën / Peugeot)
• Model: Citroën C1 / Peugeot 107
• Product Codes: 89170-0H040
• Other Numbers: 6546F7

Compatibility

Suitable for Citroën C1 and Peugeot 107 vehicles that use the corresponding SRS control unit part numbers. Always verify part number listed on the unit against the vehicle documentation or the original part before installation.

Function and Typical Faults

The airbag control unit monitors crash sensors and decides when to deploy airbags and seatbelt pretensioners. It continuously records SRS fault codes and stores crash-event data. Units most commonly fail or become unusable after an airbag deployment (crash), but can also be damaged by water ingress, severe electrical surges, connector corrosion, or physical impact. When the module detects a serious fault or previous deployment, it will typically trigger the SRS warning lamp on the dashboard.

Replacement Procedure

Replacing an airbag control unit requires care and basic diagnostic equipment. Typical removal and installation steps:

• Disconnect the vehicle battery and wait at least 10 minutes (or follow manufacturer recommended wait time) to allow residual energy in the SRS capacitors to discharge.
• Locate the SRS control unit (commonly under the center console, under a seat, or beneath the dashboard depending on model).
• Remove surrounding trim and fasteners to access the unit. Handle connectors gently and avoid pulling on wiring.
• Unplug the SRS connectors and remove the unit. Fit the replacement unit and reconnect all plugs securely.
• After mechanical installation, use a diagnostic tool to clear fault codes and verify SRS system status. If the unit contains no crash data (non-activated), clearing and verification should restore normal system operation.

Installation Recommendations

• Always disconnect the battery and follow the vehicle manufacturer’s safety procedures before starting work.
• Use appropriate tools and static-safe handling when working with airbag electronics.
• Verify connector pin condition and wiring harness integrity before installation.
• Perform a full SRS system scan with an appropriate diagnostic tool after installation to confirm correct function and to clear any stored faults.
• If unsure, have the final commissioning and SRS verification performed by a qualified technician with PSA-compatible diagnostic equipment.

Why This Part Fails Most Often

The most frequent reason an airbag control unit is replaced is a vehicle collision that triggers airbag deployment — after deployment the unit usually stores crash data and must be replaced or reprogrammed according to manufacturer rules. Other common causes of failure include water damage, wiring harness faults, connector corrosion, and electrical surges. Proper prevention includes avoiding moisture ingress and ensuring secure, corrosion-free electrical connections.

Notes

This listing describes a fully functional, non-activated airbag control unit. Follow all safety guidelines when handling SRS components and perform diagnostic checks after installation.

This unit is essential for maintaining proper airbag functionality, providing critical protection in the event of an accident. It’s important to erase any CRASH data before installation to ensure optimal performance.

For accuracy, the product numbers associated with this unit are 89170-0H040 and 6546F7. Regular inspections and prompt replacements are advisable as airbag units can fail over time due to component wear and electronic malfunctions.

Technical Information

• Manufacturer: PSA
• Model: Citroën C1, Peugeot 107
• Product Codes: 89170-0H040
• Additional Numbers: 6546F7