Description
Electric central locking actuator for the left rear door for Citroën C4 II. Door behind the driver.
This replacement electric lock is designed for the left rear door of the Citroën C4 II and restores reliable central locking operation and door security. Ideal for professional workshops and DIY mechanics, the unit is a direct-fit solution that reconnects the door latch mechanism to the vehicle’s central locking system. Common searches include the OEM references listed below, so the listing is optimized for technicians who search by part number.
Key Benefits
- Direct Fit For Citroën C4 II Left Rear Door (Driver-Side)
- Restores Central Locking Functionality And Door Security
- Easy To Test Before Reassembly — Saves Workshop Time
- OEM Reference Numbers Included For Fast Identification
Technical Information
- Manufacturer: Stellantis (Citroën/Peugeot)
- Model: Citroën C4 II (Second Generation), Left Rear Door
- Product Codes: 9685351980
- Other Numbers: 9137W1
Function And Application
The actuator operates the door latch as part of the vehicle’s central locking system. When the central locking command is received (remote key, door switch, or ECU signal), the actuator moves the internal levers and rods to lock or unlock the door. Proper operation ensures secure closure, correct interaction with door handles and child locks, and integration with the vehicle’s alarm and convenience functions.
Typical Failure Modes
This component commonly fails due to mechanical wear of internal plastic gears, motor wear, corrosion or poor contact at the electrical connector, and water ingress behind the door trim. Symptoms include intermittent locking, loud grinding or clicking noises during locking cycles, inability to lock/unlock the affected door, or the door only responding to manual operation.
Replacement Guide
Basic Steps For Replacement (Suitable For Experienced DIYers And Technicians):
- Disconnect Negative Battery Terminal To Avoid Short Circuits.
- Remove Interior Door Trim And Any Fasteners Holding The Moisture Barrier.
- Peel Back The Moisture Barrier Carefully To Access The Lock Module.
- Disconnect The Electrical Connector From The Actuator.
- Disconnect Linkage Rods From The Lock Mechanism (Note Orientation For Reassembly).
- Unbolt The Lock/Actuator Assembly From The Door Shell And Remove The Old Unit.
- Install The New Actuator, Reattach Rods And Connectors, Then Test Central Locking Operation Before Reassembling The Door Trim.
- Reinstall Moisture Barrier And Door Trim, Ensuring All Clips And Fasteners Are Secure.
Installation Recommendations
- Test The New Unit Electrically Before Final Reassembly To Ensure Correct Function.
- Use Dielectric Grease On Electrical Connectors To Reduce Corrosion Risk.
- Lubricate Lock Linkages With Suitable Long-Lasting Grease To Reduce Wear.
- Ensure The Moisture Barrier Is Properly Resealed To Prevent Water Ingress.
- Check Door Handle And Child Lock Operation After Installation To Confirm Correct Linkage Adjustment.
Why This Part Fails Most Often
The most common causes are long-term mechanical wear of plastic internals, motor burnout from repeated cycles, and water or dirt ingress that accelerates gear wear and connector corrosion. Frequent short trips, exposed parking, or damaged moisture seals increase the likelihood of premature failure.
Replacing the left rear door lock with the correct reference number restores reliability and avoids secondary faults such as alarm false-arming or inability to secure the vehicle. Always verify that the part code matches the vehicle’s door position and generation before installation.
