Description
Electric central locking actuator for the left front door for Citroën C4 and DS4 — Driver’s door.
This electric door lock is a direct-fit component for the left front (driver’s) door on Citroën C4 II and DS4 5-door models. It replaces the internal locking mechanism of the central locking system, restoring reliable locking and unlocking by remote control or door handle. Ideal for professional workshops and competent DIY mechanics who search by part number: 9685351380, 9135HQ.
The unit operates as part of the central locking assembly, converting the electric signal from the door control module into mechanical movement that actuates the latch. Typical symptoms of a failing actuator include noisy or slow locking, intermittent locking/unlocking, inability to lock from remote control on the affected door, or a door that does not latch properly. Replacing this actuator will often resolve these issues and restore normal door operation.
Technical Information
- Manufacturer: Stellantis (Citroën/Peugeot Original Equipment)
- Model: Citroën C4 II; DS4 (Left Front / Driver’s Door, 5-Door)
- Product Codes: 9685351380, 9135HQ
- Additional Numbers: 9685351380 | 9135HQ (OE Reference)
Installation Recommendations
Basic replacement procedure—recommended for qualified technicians or experienced DIYers:
- Disconnect the negative battery terminal before starting to avoid electrical short circuits and inadvertent airbag deployment.
- Remove the inner door trim panel carefully to access the lock assembly. Preserve clips and screws for reinstallation.
- Lower or secure the window if required, and peel back the plastic vapor barrier to expose the lock actuator and linkage rods.
- Disconnect the electrical connector from the actuator and unclip any locking rods; note their positions for correct reassembly.
- Unbolt the actuator/latch assembly from the door, replace with the new unit, reconnect rods and electrical connector, and test central locking function before reassembling the door trim.
- After installation, check that the door closes and latches smoothly, and verify remote and manual locking/unlocking operation.
Why This Part Fails Most Often
- Moisture ingress and corrosion inside the door can damage electrical connections and the small electric motor or gears inside the actuator.
- Wear of plastic gears or mechanical components over time, especially in high-mileage vehicles or in cold climates where lubrication becomes less effective.
- Electrical faults such as connector corrosion, damaged wiring, or intermittent power supply from the door module.
- Mechanical stress from forced operation (e.g., slamming the door with a partially engaged latch) or from previous accident damage to the door/latch area.
If you are searching by part number, use 9685351380 or 9135HQ to quickly locate this exact actuator. Proper installation and occasional lubrication of the latch mechanism extend service life and prevent premature failures caused by contamination or corrosion.
Suitable for use in professional repairs and reliable as a direct replacement for the original unit on applicable Citroën C4 II and DS4 5-door vehicles. Order by OE number to ensure fast identification: 9685351380 / 9135HQ.
