Description
Roof Airbag For Citroën C4 II And DS4. Driver Side – Left.
High-quality used roof (curtain) airbag designed for Citroën C4 II and DS4 vehicles, intended for the driver-side (left) position. This unit is a direct-fit replacement part frequently searched by product codes 9687158780, 9801890780 and 821601. It restores side-impact and head-protection capability after a deployed or damaged original module and is suitable for professional workshops and competent DIY mechanics who follow safety procedures.
Technical Information
- Manufacturer: Stellantis (Citroën/Peugeot)
- Model: Citroën C4 II, DS4
- Product Codes: 9687158780, 9801890780, 821601
- Other Numbers: Common OEM References As Above
Fits / Compatibility
Designed for Citroën C4 II (B7) and DS4 interiors where a left-side roof/curtain airbag is specified. Always match the part numbers (9687158780, 9801890780, 821601) with the vehicle’s original component listing to confirm fitment.
Function And Typical Failure Modes
The roof (curtain) airbag protects occupants’ heads in side impacts and rollovers by deploying from the headliner area. These modules typically fail or require replacement for the following reasons:
- Deployment In A Collision — Once deployed, an airbag must be replaced.
- Water Ingress Or Roof-Leak Damage — Leaks around the sunroof or seals can corrode connectors or damage the inflator and wiring.
- Connector Or Wiring Damage — During previous repairs, trims removal or after impacts, connectors or harnesses may be damaged or pinched.
- Previous Improper Repairs — Non-factory repairs or missing retaining clips can affect mounting and sensor activation.
- Age-Related Degradation — While rare, mechanical or connector degradation over many years can cause fault codes or reduced reliability.
How To Replace
Replacing a roof airbag requires care and basic diagnostic capability. General replacement steps:
- Disconnect The Battery: Always disconnect the negative battery terminal and wait at least 10 minutes (or follow the manufacturer’s recommended wait time) before working on SRS components to reduce the risk of accidental deployment.
- Remove Interior Trim: Carefully remove headliner trim, A-pillar and any clips around the roof rail using trim tools to avoid damaging the panels.
- Unplug Connectors: Disconnect the airbag electrical connector(s). Inspect connectors and wiring for corrosion or damage.
- Unfasten Module: Remove the retaining screws or clips securing the airbag module to the roof rail or body.
- Install New Unit: Fit the replacement airbag, secure fasteners to the correct position, and reconnect all electrical connectors ensuring proper engagement.
- Diagnostic Check: Use a compatible diagnostic tool to clear any SRS fault codes after installation and verify system status. If an airbag light remains on, diagnose the specific fault code.
Recommended Tools And Notes
- Trim Removal Tools, Torx/Screwdriver Set, Multimeter, OBD/Diagnostic Scanner With SRS Capability
- Replace Any Damaged Clips, Fasteners Or Harness Parts Rather Than Reusing Them.
- Keep Work Area Stable And Avoid Static Discharge Near The Airbag Inflator.
Installation Recommendations
Due To The Safety-Critical Nature Of Airbag Systems, Installation Should Be Carried Out By A Trained Technician Or By A Competent Person Following Manufacturer Procedures. Always Disconnect The Battery Before Starting Work. After Installation, Clear SRS Codes With A Diagnostic Scanner And Confirm That The Airbag Warning Light Turns Off During The Ignition Self-Check.
Why Customers Choose This Part
Customers select this unit because it matches OEM part numbers (9687158780 / 9801890780 / 821601), fits original mounting points and restores occupant protection after a crash or damage. Buying a correctly coded and physically intact replacement airbag helps avoid lengthy and costly repairs to wiring and trim that often accompany improper replacements.
Important Safety Note
Airbags Are Life-Saving Devices. Improper Handling Or Installation Can Cause Failure To Deploy Or Unintended Deployment. If You Are Not Confident In Performing The Replacement Safely, Seek A Professional Workshop.
