This Electric Central Lock Actuator Is A Direct Replacement For The Right Front (Passenger Side) Door On Citroën C4 II And DS4 Models. Designed To Restore Reliable Central Locking Operation, It Is Frequently Searched By Product Codes 9685351480 And 9136GR, Which Makes Identification Simple For Workshops And Do-It-Yourself Mechanics. The Unit Controls Door Locking And Unlocking Via The Vehicle’S Central Locking System And Interfaces With The Door Latch Mechanism To Provide Secure Closure And Remote Locking Functionality.

Key Benefits

Restores Smooth And Quiet Locking Action, Eliminates Intermittent Central Locking Faults, And Prevents Manual Forcing Of The Door Lock. Ideal For Mechanics And Enthusiasts Who Need A Direct-Fit Replacement That Matches Original Equipment Functionality. Including The Correct Part Number In Your Search (9685351480, 9136GR) Improves Findability And Ensures Fast Installation.

Compatibility

• Citroën C4 II (C4 Mk2)
• DS4

Technical Information

• Manufacturer: Citroën (Stellantis)
• Model: Citroën C4 II; DS4
• Product Codes: 9685351480, 9136GR
• Other Numbers: OEM 9685351480; Internal Code 9136GR

Installation Recommendations

Disconnect The Negative Battery Terminal Before Starting Work To Prevent Short Circuits And Unintended Actuator Movement. Remove The Door Trim Carefully Using A Trim Removal Tool To Avoid Breaking Clips. Peel Back The Moisture Barrier, Disconnect The Electrical Connector And Lock Rods, And Unfasten The Actuator From The Door Latch Assembly. Fit The New Actuator In The Reverse Order, Reconnect The Electrical Connector And Linkage, Reinstall The Moisture Barrier And Door Trim, Then Test Locking And Unlocking Functions Several Times With The Engine Off And With The Ignition On. If Electrical Faults Persist, Inspect Connectors And Wiring For Corrosion Or Broken Wires; A Multimeter Can Help Verify Power And Ground At The Connector.

Most Common Failure Causes

• Wear Of Internal Motor Or Gears: Plastic Internal Gears Can Degrade Over Time, Producing Grinding Or Failure To Move The Latch.
• Moisture Ingress And Corrosion: Water Penetration Or Condensation Can Cause Corrosion Of Electrical Contacts Or Mechanical Seizure.
• Electrical Issues: Intermittent Wiring, Damaged Connector Pins Or A Faulty Ground Can Prevent The Actuator From Receiving Power.
• Mechanical Damage: Impact Or Forced Operation Can Bend Linkages Or Break Mounting Tabs.

Typical Symptoms Include Intermittent Locking/Unlocking, No Response From The Door When Using Remote Or Central Locking, Excessive Noise From The Door, Or The Door Not Securing Properly. Replacing The Actuator With The Correct Product Code (9685351480 / 9136GR) Restores Factory Functionality And Ensures Compatibility With The Door Latch And Central Locking System.

Product Overview

This electric central locking lock is designed for the left front (driver’s) door on Citroën C4 II and DS4 models. It restores reliable central locking operation when the original door lock mechanism becomes faulty. Frequently searched under part numbers 9685351380 and 9135HQ, this unit is suitable for professional garages and DIY mechanics who perform door repairs and central locking diagnostics.

Function and Symptoms

The lock assembly houses the actuator motor and mechanical linkages that convert electrical signals from the central locking system into the physical motion that locks and unlocks the door. Typical failure symptoms include:

• No response from the left front door to central locking commands.
• Intermittent locking/unlocking or delayed operation.
• Grinding or clicking noises inside the door when operating locks.
• Manual lock still works but electrical locking fails.

Replacement Procedure

Basic steps to replace the left front door lock assembly (general guidance):

• Disconnect the vehicle battery before starting to prevent short circuits and protect electronics.
• Remove the door trim panel and the protective vapor/water barrier to access the lock mechanism.
• Disconnect the electrical connector from the lock actuator and detach any locking rods or clips linked to the handle and latch.
• Unscrew and remove the lock unit from the door shell, then fit the new unit in the reverse order.
• Before refitting the trim, test the central locking operation to ensure correct installation and rod linkage alignment.

Installation Recommendations

• Follow manufacturer procedures and keep fasteners and clips in their correct positions to avoid rattles or misalignment.
• Check and, if necessary, clean and protect the electrical connector contacts to prevent future corrosion-related faults.
• Replace any brittle or damaged linkage clips and ensure door moisture seals are intact to reduce water ingress to the mechanism.
• If unsure about the repair, have the installation performed by an experienced technician to guarantee correct adjustment of linkages and calibration of the locking system.

Why The Part Most Commonly Fails

Door lock actuators fail mainly due to mechanical wear and environmental exposure. Common causes include worn or broken plastic gears inside the actuator, motor burnout from extended use, corrosion of electrical connectors, and water ingress from damaged door seals. Frequent short trips, heavy use of central locking, or exposure to moisture accelerate wear and lead to intermittent or complete failure.

Technical Information

• Manufacturer: Stellantis / Citroën
• Model: Citroën C4 II, DS4 (Left Front Door, Driver’s Door, 5-door variants)
• Product Codes: 9685351380, 9135HQ
• Other Numbers: 9135HQ, 9685351380

Notes For Mechanics and DIYers

Search for the unit using the OE part numbers to find matching replacements quickly. Verify door type (left front / driver side) and body version (5-door) before ordering. After installation, confirm smooth operation of both remote and manual locking functions, and recheck linkage alignment to avoid door not latching properly.

Replace the lock assembly to restore dependable central locking and eliminate the inconvenience and security risk of a faulty driver door lock.