Description
Electric central locking mechanism for the left rear door of CITROËN C4 5‑door vehicles. Driver’s side rear door.
Reliable replacement electric door lock (central locking actuator) designed to restore secure locking and unlocking on the left rear (driver’s side rear) door of Citroën C4 five‑door models. Ideal for professional workshops and competent DIY mechanics, this unit is often searched by part numbers 9660700380, 9137E0, 9137K5 or 9137Q2 — include these codes when locating compatibility. The assembly supplies electric actuation of the latch and lock position feedback to the vehicle’s central locking system, ensuring smooth operation with remote key or door switch.
Technical Information
- Manufacturer: Stellantis / Citroën
- Model: Citroën C4 5‑door (Left Rear Door)
- Product Codes: 9660700380, 9137E0, 9137K5, 9137Q2
- Additional Numbers: 6460SL, 9137
Function and Features
This electric lock/actuator operates the door latch and the central locking mechanism. It converts electrical signals from the car’s locking system into mechanical movement to lock or unlock the door and typically provides a position/status signal back to the vehicle electronics. The unit is a direct replacement part for the left rear door and is built to integrate with the existing door latch and wiring harness.
Common Failure Modes
Door locks usually fail due to mechanical wear, seized internal gears, water ingress or corrosion inside the mechanism, damaged linkages, or a failed electric motor. Intermittent operation can also be caused by a worn microswitch or poor connector contacts. Failures often occur after many cycles and exposure to moisture or road salt.
Replacement Procedure (Overview)
- Remove interior door trim carefully to access the lock assembly — keep clips and screws organized.
- Disconnect the door wiring harness and any connector for the lock motor/sensor.
- Detach linkage rods/cables from the latch mechanism (note their positions for reassembly).
- Unbolt and remove the old lock module from the door shell.
- Fit the new lock assembly, secure mounting bolts and reconnect linkages and electrical connector.
- Before refitting the trim, test lock/unlock operation with the key fob and interior switch and verify latch engagement.
- Reinstall door trim and check all functions (child lock, manual lock, central locking cycles).
Installation Recommendations
- Always disconnect the negative battery terminal before working on door electrics to avoid short circuits and unintended actuation.
- Work on a warm, dry day if possible — moisture increases the risk of corrosion and makes seals harder to re-seat.
- Use appropriate trim tools to avoid damaging interior panels and clips.
- Lubricate mechanical latch points with recommended grease and ensure linkages move freely without binding.
- After installation, perform multiple lock/unlock cycles and check remote operation, manual lock, and door open/close to confirm correct function.
Why This Part Is Often Replaced
The left rear door lock is a wear item subject to frequent use and environmental exposure. Water ingress, rust, and mechanical fatigue of gears or linkages are the most common reasons for replacement. Electrical faults such as a failed motor or worn position switch can also prevent proper locking or reporting of door status to the vehicle.
Notes
When searching for this item, use the part numbers listed above (9660700380, 9137E0, 9137K5, 9137Q2) to ensure correct match. This unit is intended as a direct replacement for the left rear (driver’s side) door on Citroën C4 five‑door models.
