This left front (driver) seat belt assembly is an OEM-compatible safety component designed for Citroën C4 Picasso and C4 Grand Picasso models. It includes the retractor with pyrotechnic pretensioner and the belt webbing required for driver-side protection. Commonly searched by part numbers such as 9654964477, 8974XJ and 8974XZ, this unit is aimed at professional mechanics and experienced DIY technicians who require a reliable, direct-fit replacement when the original belt is damaged or the pretensioner has deployed.

Key Features And Function

The seat belt restrains and secures the occupant during normal driving and locks in high-deceleration events. The integrated pyrotechnic pretensioner rapidly retracts slack in the belt at the moment of a collision to reduce occupant movement and improve airbag effectiveness. The assembly consists of the webbing, retractor mechanism, buckle/anchor points and the pretensioner module. Materials and components are selected to meet vehicle safety requirements and to interface with the vehicle’s seat belt anchorage and SRS wiring harness.

Technical Information

• Manufacturer: Citroën / Stellantis
• Model: C4 Picasso, C4 Grand Picasso
• Product Codes: 9654964477, 8974XJ, 8974XZ
• Other Numbers: Pyrotechnic Pretensioner Reference 8974XZ

Installation Recommendations

• Work Should Be Performed By A Trained Technician Or A Competent DIYer Familiar With SRS Components.
• Disconnect The Battery Before Starting And Wait At Least 10 Minutes To Allow SRS Capacitors To Discharge.
• Remove Interior Trim Panels Carefully To Access Upper And Lower Anchor Bolts; Avoid Damaging Airbag Wiring Or Connectors.
• Unbolt The Old Assembly From The Anchor Points, Disconnect The Pretensioner Connector, And Install The New Unit In Reverse Order.
• Tighten Fasteners To The Vehicle Manufacturer’s Specified Torque And Ensure Electrical Connectors Are Fully Seated.
• After Installation, Verify Smooth Retraction/Extension Of The Belt And Correct Buckle Operation. If Any SRS Warning Lights Appear, Diagnose With Appropriate Diagnostic Equipment.

Why This Part Fails Most Often

Seat belts and their pretensioners typically fail or require replacement for these reasons: pretensioner deployment during a collision, damage to webbing from abrasion or contamination, mechanical wear or jamming of the retractor mechanism, and electrical faults in the pretensioner circuit. Exposure to dirt, heavy soiling or chemical contaminants can weaken webbing fibers and compromise performance. After any airbag or pretensioner activation, the affected belt must be replaced.

Practical Notes For Mechanics And DIYers

Mechanics often search for the exact part number when sourcing replacements—listing OEM references such as 9654964477, 8974XJ and 8974XZ improves findability. When fitting a new belt assembly with a pyrotechnic pretensioner, follow safety rules for SRS components and use the vehicle manufacturer’s repair manual for disassembly and torque values. Keep the new assembly dry and free from grease or solvents that can damage the webbing. If the pretensioner connector or wiring is corroded or damaged, repair according to manufacturer guidelines before completing the installation.

Recommended Aftercare

Inspect Seat Belt Operation Regularly For Smooth Retraction And Any Signs Of Damage. Clean Webbing With Mild Soap And Water If Needed; Avoid Bleaches Or Solvents. Replace The Assembly Immediately If The Belt Shows Cuts, Fraying, Or If The Pretensioner Has Been Activated.

Upgrade or replace a critical safety component with this genuine-style pyrotechnic seat belt pretensioner designed for the left front (driver) seat of Citroën C4 Picasso and C4 Grand Picasso models. The unit instantly tightens the lap and shoulder belt during a severe impact to reduce occupant movement and improve airbag timing. Ideal for professional workshops and experienced DIY mechanics who routinely service PSA/Stellantis vehicles. Common search terms include the OE references 9657326377 and 8974XZ, making this listing easy to find for targeted repairs.

Key Benefits

High-value safety replacement for post-collision repairs or SRS system fault resolution. Restores pretensioner function to improve occupant protection in a subsequent collision. Compatible with original mounting and electrical connectors for straightforward integration into the vehicle wiring harness.

How It Works

The pyrotechnic pretensioner contains a small pyrotechnic charge that, when triggered by the airbag control unit during a detected crash event, rapidly retracts the belt webbing to remove slack. This action positions the occupant more effectively for airbag deployment and seatbelt load distribution. Pretensioners are single-use devices and must be replaced after deployment.

How To Replace (Overview)

• Disconnect Battery: Always disconnect the negative battery terminal and wait at least 10 minutes to allow SRS capacitors to discharge before starting work.
• Remove Trim: Carefully remove seat trim and plastic covers to access the buckle/pretensioner assembly. Keep fasteners and trim clips for reinstallation.
• Unplug Connector: Locate and disconnect the pretensioner electrical connector. Inspect the connector and wiring for corrosion or damage.
• Unbolt Assembly: Remove mounting bolts securing the pretensioner to the seat structure. Replace the unit with correct orientation.
• Reinstall And Torque: Refit bolts and trim. Follow manufacturer torque specifications and resecure all clips.
• SRS System Reset: After physical replacement, clear SRS fault codes and verify system status with a diagnostic tool. A full scan ensures the airbag indicator lamp is extinguished and the system is functional.

Installation Recommendations

• Work Should Follow Manufacturer Procedures: Use the vehicle manufacturer’s instructions and torque values where specified.
• Safety First: Treat the pretensioner as an explosive safety device—handle with care and avoid impacts to the unit.
• Diagnostic Check Recommended: Use a compatible diagnostic tool (DiagBox/PP2000/Lexia or equivalent) to clear codes and confirm SRS system integrity after replacement.
• Professional Fitment Advised For Uncertainty: If you are not experienced with SRS components, have a trained technician perform the replacement.

Why This Part Fails Most Often

• Deployment In A Collision: Pretensioners Are Single-Use And Must Be Replaced After Activation.
• Electrical Faults Or Connector Corrosion: Moisture Ingress Or Damaged Wiring Can Cause SRS Faults That Disable The Pretensioner.
• Previous Improper Repairs: Incorrect Reinstallation Or Aftermarket Modifications Can Prevent Proper Operation.
• Age-Related Degradation: While Not Common Without Deployment, Long-Term Exposure To Harsh Conditions Can Affect Connectors And Mounts.

Technical Information

• Manufacturer: Stellantis / Citroën
• Model: Citroën C4 Picasso, C4 Grand Picasso (Left Front – Driver)
• Product Codes: 9657326377, 8974XZ
• Additional Numbers: 8974XZ

Note

This part is intended as a direct replacement for the left front pretensioner on compatible Citroën C4 Picasso variants. Always follow safe handling procedures for SRS components and verify system status with a diagnostic scan after replacement to ensure full vehicle safety functionality.