This airbag control unit (SRS ECU) is an original-equipment replacement designed for Citroën Berlingo I and Peugeot Partner I models. It manages the deployment of airbags and seatbelt pretensioners, processes inputs from crash sensors and impact detectors, and stores fault and crash-memory data. Ideal for professional workshops and experienced DIY mechanics who search by part number (9637176880, 6547WA), this module helps restore correct SRS system function after faults or post-collision servicing.

Key Features And Benefits

Reliable SRS System Control: Ensures coordinated airbag and pretensioner deployment according to sensor input. Clear Compatibility: Commonly fitted to Berlingo I and Partner I (first generation). Easy Identification: Frequently searched by product numbers 9637176880 and 6547WA. Workshop-Friendly: Suitable for mechanics familiar with PSA diagnostics and SRS procedures.

Technical Information

• Manufacturer: Stellantis (Citroën / Peugeot)
• Model: Citroën Berlingo I (1996–2008), Peugeot Partner I (1996–2008)
• Product Codes: 9637176880, 6547WA
• Other Numbers: 637176880

Function And What To Expect

The unit continuously monitors impact sensors, seatbelt buckle switches and other SRS inputs. On detecting a qualifying impact, it triggers the appropriate airbags and pretensioners. It also logs fault codes and crash events in non-volatile memory, which is used by diagnostic tools to identify system status and whether components have been deployed.

Common Failure Causes

• Airbag deployment following a collision (the unit often records the crash and requires replacement or professional reprogramming).
• Water Ingress Or Corrosion Causing Connector Or PCB Damage.
• Electrical Surges Or Short Circuits Affecting Internal Electronics.
• Damaged Wiring Or Faulty Crash/Impact Sensors Producing Persistent Fault Codes.
• Age-Related Component Degradation Or Intermittent Connections.

Replacement And Installation Guidance

General Procedure (Overview):

1. Prepare The Vehicle: Park on level ground, engage parking brake and remove ignition key.
2. Disconnect Battery: Always disconnect the negative battery terminal before working on the SRS. Wait at least 3 minutes to allow stored energy in capacitors to dissipate.
3. Access The Unit: Remove trim panels or glovebox as required to reach the SRS ECU (typically located inside the passenger compartment, behind the dashboard or central console, depending on model and chassis).
4. Disconnect Connectors: Carefully unplug all SRS connectors, avoiding damage to locking tabs and cables.
5. Replace The Unit: Remove mounting fasteners, fit the replacement unit in the original position and secure to the manufacturer’s torque where specified.
6. Reconnect And Recommission: Reconnect wiring, battery and perform a full SRS system check with an appropriate diagnostic tool. Clear Fault Codes Only After Confirming System Integrity.

Important Safety Notes: Always follow the vehicle manufacturer’s procedures. Handle airbag connectors and wiring with care—do not attempt to modify or repair the module’s printed circuit board. Use appropriate personal protective measures and static-safe handling when working around SRS electronics.

Diagnostics And Post-Installation

After fitting a replacement SRS ECU, a diagnostic scan is required to read and clear fault codes, verify sensor circuits and confirm the system is operational. For full functionality it is recommended to use PSA-compatible diagnostic equipment (such as DiagBox/Lexia/PP2000) to perform SRS checks and to confirm whether additional actions (sensor replacement, recalibration) are necessary.

Compatibility And Search Tips

Customers commonly locate this part by the numbers 9637176880 and 6547WA. It is intended for first-generation Citroën Berlingo and Peugeot Partner models. Confirm fitment by matching these part numbers with the unit on the vehicle.

Recommendation For Installation

Due to the safety-critical nature of the airbag system, installation and any required programming or memory handling should be carried out by a qualified technician with suitable diagnostic tools. If you are an experienced DIYer, follow the steps above and ensure the system is fully diagnosed and cleared with a professional-grade scanner after replacement.

Why This Part Is Often Replaced

The airbag control unit is most commonly replaced after vehicle collisions (deployment events), but can also fail from water damage, corrosion, or electrical faults. When the module records a crash event or persistent SRS faults that cannot be resolved by repairing external sensors/wiring, replacement is typically necessary to restore safe operation of the restraint system.