Description
The electric left front door lock for the Citroën C4 is a direct-fit central locking actuator designed for the driver side on 5-door models. This unit controls locking and unlocking functions via the vehicle’s central locking system and is commonly replaced when remote locking fails, the door will not latch properly, or intermittent operation occurs. It is a practical spare for workshops and experienced DIY mechanics looking for reliable compatibility with PSA Citroën/Peugeot part numbers.
Function And Symptoms
This electric actuator operates the latch mechanism of the left front door, engaging and releasing the lock during central locking commands and manual key operation. Typical symptoms of a failing unit include:
- Door does not lock or unlock with remote or central locking.
- Grinding or motor noise from inside the door when operating the lock.
- Intermittent locking behavior or the door remaining partially latched.
- Complete loss of locking function on the driver side.
Common Causes Of Failure
- Wear of internal gears or motor after prolonged use.
- Moisture ingress and corrosion inside the mechanism.
- Broken plastic components or weakened linkages due to age or impact.
- Damaged wiring or connector faults to the actuator.
Replacement Overview
Replacing the left front door lock actuator is a routine task for a trained technician or competent DIYer with basic tools. Typical steps include:
- Disconnect the negative battery terminal to prevent electrical shorts.
- Remove the interior door trim panel and any protective vapor/moisture barrier carefully.
- Locate and disconnect the electrical connector from the actuator.
- Unbolt or unclip the actuator from the door latch assembly and detach any mechanical linkages.
- Install the new actuator, reconnect linkages and the electrical connector, then reassemble the door trim and reconnect the battery.
Follow vehicle-specific service instructions and torque specifications. After installation, check full lock/unlock operation and ensure the door latches correctly from both inside and outside.
Maintenance And Tips
- Inspect door seals and drainage to reduce moisture exposure that can damage the actuator.
- Check wiring harnesses and connectors for corrosion or damage before fitting a new unit.
- Lubricate latch pivot points with suitable lubricant during reassembly to improve longevity.
Technical Information
- Manufacturer: PSA (Citroën/Peugeot)
- Model: Citroën C4 (5-door), Left Front Door / Driver Side
- Product Codes: 9647172780, 9135FA, 9135R0
- Additional Numbers: 9681337180, 9660699880 F03, 9683416080, 9135Z5
Please verify fitment by matching the OEM/product codes listed above with the vehicle VIN or existing part number before purchase. This actuator is intended as a replacement part for compatible PSA Citroën/Peugeot models; if in doubt consult technical documentation or contact a qualified technician for confirmation.
