Description
Electric central locking actuator for the left rear door for CITROËN C4 II vehicles. Rear door on the driver’s side.
This electric door lock is a direct-fit solution for the left rear (driver’s side rear) door on Citroën C4 II models and is commonly searched by part numbers 9685351980 and 9137W1. Designed for technicians and experienced DIYers, the unit operates the central locking mechanism to lock and unlock the door latch under command from the vehicle’s body control module. High-quality replacement of the actuator restores reliable central locking, prevents unwanted door opening, and stops intermittent locking faults that can leave the vehicle unsecured.
Function and Benefits
The actuator converts electrical impulses into mechanical movement to operate the door latch and lock rods. Replacing a failing actuator restores smooth locking/unlocking, eliminates audible grinding or failure-to-lock symptoms, and improves overall security. Benefits include straightforward mechanical fitment, OE-referenced part numbers for easy lookup, and compatibility with factory door harnesses on Citroën C4 II models.
Replacement Procedure
- Remove the interior door trim panel using appropriate trim tools to avoid breaking clips.
- Peel back the water/vapor barrier carefully to access the lock assembly.
- Disconnect the electrical connector from the actuator and detach any mechanical linkage or rods (note their positions for reassembly).
- Remove the retaining screws/bolts that fix the actuator to the door shell and withdraw the unit.
- Install the new actuator, refit linkages and connector, and test the central locking operation before resealing the vapor barrier and refitting the door trim.
Installation Recommendations
- Disconnect the vehicle battery negative terminal or ensure ignition is off before working on door electrics to avoid short circuits.
- Use plastic trim tools to avoid damaging the door card and retain all fasteners in order for reassembly.
- Mark the orientation and ends of all linkage rods prior to removal to ensure correct reconnection.
- Check the door wiring harness and connector for corrosion or water ingress; repair or clean contacts if necessary.
- After fitting, cycle the central locking several times to verify correct operation before final assembly.
Most Common Failure Causes
Actuator faults typically result from mechanical wear of internal plastic gears, motor burnout, or water ingress leading to corrosion. Repeated strain on linkage rods, impact damage from door closure or accidents, and long-term exposure to moisture are frequent contributors. Faults present as intermittent locking, noisy operation (grinding or clicking), or complete loss of lock/unlock function on the affected door.
Technical Information
- Manufacturer: Stellantis (Citroën/Peugeot)
- Model: Citroën C4 II
- Product Codes: 9685351980, 9137W1
- Other Numbers: 9137W1 (alternate reference)
- Position: Left Rear Door (Driver’s Side Rear)
Compatibility Note
Fits Citroën C4 II vehicles requiring the left rear central locking actuator referenced by the part numbers above. Use the listed product codes when searching to improve match confidence and speed up identification.
Practical Tips for Mechanics and DIYers
- Inspect the door latch and striker for wear while the door is open — a sticking latch can increase actuator load and shorten service life.
- If the connector shows signs of corrosion, apply dielectric grease after cleaning to help prevent future electrical problems.
- When replacing the actuator, compare the replacement visually with the removed unit to confirm matching mounting points and connector type.
Ordering by part number (9685351980 / 9137W1) is the fastest way to locate the correct left rear door lock for Citroën C4 II models and ensures you receive the matching electrical and mechanical configuration for a reliable repair.
