Description
Electric central locking actuator for the left rear door for Citroën C4 5-door vehicles. Door behind the driver.
This electric door lock is a direct-fit solution for the left rear (driver’s side rear) door of Citroën C4 five-door models. Designed for professional workshops and skilled DIY mechanics, the unit restores reliable central locking operation and compatibility with existing door latches and linkages. Commonly searched by part numbers 9681336980, 9137E0, 9137K5, 9137Q2, the actuator is ideal when the rear door fails to lock or unlock electrically or when the locking mechanism becomes noisy or intermittent.
Function
The unit operates as the electric actuator for the central locking system: it converts electrical signals from the locking system into mechanical movement to engage or release the door latch. It also integrates micro-switches and linkages that feed back lock/unlock status to the car’s central locking control. Proper function is essential for remote locking, central locking synchronization and certain vehicle safety interlocks.
How To Replace
- Disconnect the negative battery terminal before starting work to avoid short circuits and unintended actuator movement.
- Remove the inner door trim carefully to access the lock assembly (retain clips and screws). Use trim tools to avoid damage to panels.
- Peel back the vapor barrier and locate the central locking actuator and latch assembly on the left rear door.
- Disconnect the electrical connector and any linkage rods or cables attached to the actuator. Note orientation and routing of rods for reassembly.
- Unscrew the actuator/latch mounting fasteners and remove the old unit from the door.
- Install the replacement actuator, secure fasteners to the correct torque, reconnect rods/cables and electrical plug, and verify free movement of the latch.
- Reconnect the battery and test central locking operation (key fob, interior switch and manual locking) before refitting the trim. Refit vapor barrier and door trim.
Installation Recommendations
- Always disconnect the battery before removing or installing the actuator.
- Use quality trim tools to avoid breaking clips or scratching panels.
- Lubricate moving latch parts with appropriate dry or silicone-based lubricants; avoid heavy grease that attracts dirt.
- Apply dielectric grease to the electrical connector contacts to reduce corrosion risk and improve long-term reliability.
- Check and, if necessary, adjust the latch alignment and rod routing to prevent binding or excessive load on the new actuator.
- If you are unsure about electrical diagnostics, use a multimeter to verify power and ground at the connector before replacing the part.
Most Common Causes Of Failure
- Water ingress and corrosion inside the actuator or connector leading to electrical faults.
- Wear of plastic gears or mechanical components inside the actuator after many cycles.
- Broken or disconnected linkage rods/cables that prevent proper transfer of motion.
- Accumulation of dirt and debris in the latch mechanism causing increased load on the actuator motor.
- Intermittent contacts or corroded electrical connectors causing sporadic or no function.
Technical Information
- Manufacturer: Stellantis / Citroën / Peugeot
- Model: Citroën C4 (5-door) — Left Rear Door
- Product Codes: 9681336980, 9137E0, 9137K5, 9137Q2
- Additional Numbers: 9681336980, 9137E0, 9137K5, 9137Q2
Choose this central locking actuator when the left rear door of your Citroën C4 fails to lock/unlock electrically, makes grinding noises, or has intermittent operation. Ideal for professional fitment or experienced DIY replacement — order now to restore secure and quiet central locking performance.
