Description
Electric central locking actuator for the right rear door, Citroën C3 — 6-pin.
This electric right rear door lock/actuator is designed for Citroën C3 vehicles with a 6-pin connector. Built to restore reliable central locking operation, it replaces the internal mechanism that engages and releases the door latch electrically. Ideal for professional garages and competent DIY mechanics, the unit is frequently sought by part number (46978180 / 9138C1) when diagnosing rear-door locking faults.
Technical Information
- Manufacturer: Citroën (Stellantis)
- Model: Citroën C3 (Right Rear Door)
- Product Codes: 46978180, 9138C1
- Additional Numbers: NFP
- Connector: 6-Pin Electrical Connector
- Type: Electric Central Locking Actuator / Door Lock
Compatibility And Application
Designed specifically for the right rear door on Citroën C3 models that use a 6-pin actuator connection. Customers commonly search for the unit by OEM numbers 46978180 or 9138C1 — keep these codes handy when ordering or cross-referencing.
Installation Recommendations
- Disconnect the negative battery terminal before starting to avoid short circuits or accidental airbag deployment.
- Remove the interior door trim panel and protective vapor barrier to access the lock assembly.
- Carefully detach linkage rods from the actuator—note their orientation for reassembly.
- Unplug the 6-pin electrical connector and remove the mounting screws/bolts securing the actuator.
- Install the new actuator, reconnect the rods and electrical connector, and test locking/unlocking function with the door open before re-fitting the trim.
- Inspect and lubricate mechanical linkages and latch points during installation to prolong component life and ensure smooth operation.
Common Failure Causes
- Moisture Ingress And Corrosion: Water entry into the door cavity leads to corrosion of electrical contacts and internal components.
- Worn Or Broken Internal Gears: Plastic gears and motor wear over time, causing intermittent or complete failure.
- Connector Or Wiring Damage: Chafed wiring or corroded 6-pin connectors interrupt power or signals to the actuator.
- Mechanical Impact Or Misalignment: Door damage or latch misalignment places extra stress on the actuator and linkages.
- Frequent Use And Age: High-mileage vehicles or vehicles exposed to harsh environments show accelerated wear.
Practical Tips For Mechanics And DIYers
- Always test the actuator operation electrically before reassembling the door trim to save time if further adjustments are required.
- Replace damaged or brittle linkage clips and lubricate moving parts with an appropriate long-life grease.
- Check the door latch alignment and striker condition at the same time—improper alignment can load the actuator prematurely.
- When sourcing replacement parts, use the OEM product codes (46978180, 9138C1) for accurate matching.
Replacing the right rear door actuator is a common and effective repair to restore central locking functionality and vehicle security. Proper installation and routine inspection of door seals and wiring will reduce the risk of repeat failures.
