This genuine OE third brake light (center high‑mount stop lamp) is a direct replacement for a range of Citroën models and is commonly searched for by its part numbers. It restores correct signalling and visibility at the rear of the vehicle, improving safety and ensuring compliance with road regulations. Ideal For Professional Mechanics And Enthusiast DIYers Who Need A Reliable, Plug‑In Replacement Part.

Key Benefits

Direct Fit For Specified Models: Designed To Match The Original Mounting Points And Connector Types, Reducing Installation Time. Clear Identification By OEM And Alternative Part Numbers Makes This Product Easy To Find In Catalogs And Search Engines. Durable Construction: Built To OEM Standards With Proper Sealing To Resist Road Vibration And Typical Environmental Exposure.

How It Works And When To Replace

The Third Brake Light Houses LEDs/Light Elements And Serves As A Center High‑Mount Stop Lamp (CHMSL), Providing An Additional Brake Signal Visible To Vehicles Behind. It Should Be Replaced If The Light Fails To Illuminate, If The Lens Is Cracked Or Distorted, Or If There Is Evident Water Ingress Or Corrosion At The Connector. Always Inspect The Supply Cable And Connector Before Replacing The Lamp—A Faulty Wiring Harness Or Damaged Connector Can Cause A New Unit To Appear Defective.

How To Replace (Typical Procedure)

• Park The Vehicle On A Level Surface And Disconnect The Battery Before Starting Work.
• Access The Lamp From Inside The Tailgate/Rear Hatch By Removing Interior Trim Panels Or Fasteners.
• Disconnect The Electrical Connector And Remove Securing Screws Or Clips Holding The Lamp To The Tailgate.
• Swap The Old Lamp For The New Unit, Reconnect The Electrical Connector, Seal Any Grommets If Needed, And Refit Interior Trim.
• Reconnect The Battery And Verify Full Function Of Brake Lights (Brake Pedal Depressed And Handbrake/Lighting Checks Where Applicable).

Technical Information

• Manufacturer: Stellantis (Citroën / Peugeot)
• Model: Citroën C4, Citroën C4 Cactus, DS4, Citroën C5 X7 (Select Generations/Body Types As Listed)
• Product Codes: 9689043280, 89093324, 89093538
• Other Numbers: 6350V2, 6351HH, 6351EY, 9688835380 (Reference / Cross Numbers)

Installation Recommendations

Always Disconnect The Battery Before Removing Or Installing The Lamp To Prevent Short Circuits And Protect Vehicle Electronics. Check The Condition Of The Supply Cable, Connector Pins, And Grommets; Clean Corroded Contacts Or Replace Damaged Wiring. Use Correct Torque On Fasteners And Ensure The Lamp Sits Flush To The Tailgate To Maintain Sealing Against Moisture. After Fitting, Test The Brake Light Function With An Assistant Or Use A Diagnostic Light Tool.

Why This Part Commonly Fails

Typical Causes Of Failure Include Water Ingress Through A Damaged Lens Seal Or Gasket, Corrosion Or Oxidation Of The Electrical Connector, Impact Damage To The Lens Or Housing, And Internal LED Or Circuit Board Failures Due To Vibration Or Thermal Stress. In Many Cases, The Underlying Cause Is A Compromised Wiring Harness Rather Than The Lamp Itself—Inspect Wiring Before Replacing The Unit.

Part Numbers And Clear Model References Improve Searchability In Online Stores And Spare‑parts Catalogs—If You Regularly Search By OEM Code, Use Any Of The Numbers Listed Above To Locate This Exact Fitment.

Product Description

This centre high-mount stop lamp (third brake light) is a direct-fit replacement unit designed for Citroën passenger cars listed below. It restores rear signalling visibility and brake light compliance, improving safety during braking and reducing the risk of rear-end collisions. The unit matches original Stellantis mounting points and electrical connector layout for straightforward replacement.

Compatibility

Compatible Models: Citroën C4 I, Citroën C4 II, Citroën C4 Cactus, Citroën DS4, Citroën C5 X7. Always check the part numbers against your vehicle equipment level and production year to ensure correct fitment.

How To Replace

Replacement is suitable for experienced DIYers and professional garages. General procedure: remove interior tailgate/boot trim to access the lamp assembly, undo retaining screws or fasteners, disconnect the electrical connector, remove the old lamp and clean the mounting area, fit the new lamp and secure with original fasteners, reconnect the wiring and test all light functions (brake, tail, and any integrated LED functions). Ensure sealing surfaces are clean to prevent water ingress. Before starting, disconnect the vehicle battery to avoid short circuits or electrical damage.

Most Common Failure Reasons

Typical causes of failure include water ingress and corrosion of contacts, damaged supply cable or connector, mechanical impact to the rear hatch, and internal LED or filament failure. Wiring abrasion or poor sealing around the tailgate can accelerate failure. Regular visual inspection of the connector and seal can prevent premature issues.

Technical Information

• Manufacturer: Stellantis
• Model: Citroën C4 I / C4 II / C4 Cactus / DS4 / C5 X7
• Product Codes: 9646804580, 6350V2, 6351HH, 6351EY
• Other Numbers: 6350.V2, 6351.EY, 6351.HH

Installation Recommendations

Use original-style fasteners and avoid over-tightening to prevent cracking the housing. Check the condition of the wiring harness and replace any brittle or corroded terminals. After installation, verify operation of the brake light from inside the vehicle and with an assistant outside, and ensure the tailgate closes without pinching the cable. If unsure about access or connector condition, have the replacement performed by a professional technician.