Description
Left roof airbag, for CITROËN C4 3-door and 5-door. Driver’s side.
High-quality replacement left roof (curtain) airbag for Citroën C4 (first generation), designed for both 3-door and 5-door body styles. Supplied under reference numbers 9646572180 and 833133, this airbag restores the vehicle’s side-impact protection and is suitable for mechanics and experienced DIY enthusiasts seeking a direct-fit solution. The unit is intended for the driver’s side roof rail and integrates with the vehicle’s Supplemental Restraint System (SRS).
Technical Information
- Manufacturer: Citroën (Stellantis)
- Model: Citroën C4 I (3-Door and 5-Door)
- Product Codes: 9646572180, 833133
- Additional Numbers: None listed
Function
The roof (curtain) airbag deploys from the headliner area along the side of the cabin to protect occupants’ heads and upper bodies in the event of a side impact or rollover. It is part of the vehicle’s SRS and works together with seatbelts and other airbags to reduce the risk of serious injury.
How To Replace
- Disconnect the vehicle battery and wait at least 10 minutes to allow the SRS capacitors to discharge.
- Remove interior trim pieces and the headliner sections as required to access the roof airbag module (follow vehicle-specific removal order to avoid damage).
- Carefully disconnect the airbag electrical connector(s) and unbolt the airbag module from the roof rail.
- Install the new airbag in the reverse order: secure mounting points, connect the electrical connector(s) ensuring positive locking, and reattach trim/headliner panels.
- Reconnect the battery and perform a full SRS system check with a diagnostic scanner to confirm proper operation and to clear any fault codes.
Mounting Recommendations
- Always disconnect the battery before beginning work and follow the vehicle manufacturer’s procedures to prevent accidental deployment or damage.
- Handle the airbag module with care: avoid impacts, excessive bending of the module, and contact with sharp objects or liquids.
- Ensure connectors are clean, dry, and properly locked. Replace any damaged wiring or connector clips to prevent intermittent faults.
- After installation, verify SRS readiness with an appropriate diagnostic tool and clear stored errors only after confirming successful installation.
- Installation is recommended for qualified technicians or experienced DIYers familiar with SRS systems.
Most Common Failure Reasons
- Deployment During A Collision: Once deployed in an accident, the airbag must be replaced.
- Electrical Or Connector Damage: Corrosion, broken pins, or damaged wiring in the roof harness can prevent proper deployment or cause fault codes.
- Water Ingress Or Moisture: Leaks or prolonged moisture exposure can corrode connectors and mounting hardware, leading to failures.
- Incorrect Previous Repairs: Improper reinstallations or using incompatible parts may cause malfunction or SRS faults.
- Age-Related Degradation: Although less common, long-term exposure to temperature cycles and vibration can affect connectors and mounting integrity.
Part numbers 9646572180 and 833133 are commonly used when searching for this component—include them in your lookup to improve compatibility matching. Suitable for professionals and competent DIY mechanics familiar with airbag systems.
