Description
Third Rear Brake Light For CITROËN C4, C4 Cactus, DS4, C5 X7. Before Purchasing, Make Sure The Vehicle Does Not Have A Damaged Supply Cable. Tested Fully Functional.
Product Overview
This third (center high‑mount) rear brake light is a direct replacement part for many Citroën and Peugeot models in the Stellantis group. It Restores The Center Brake Signal Visibility, Improves Safety During Braking, And Keeps The Vehicle Road‑Legal. The Unit Is Often Searched By Part Numbers (9646804580, 6350V2, 6351HH, 6351EY), So Including These Codes In Your Order Will Speed Up Identification.
Compatibility
- Citroën C4 (First And Second Generation Where Applicable)
- Citroën C4 Cactus
- Citroën DS4
- Citroën C5 X7
Function And Typical Construction
The Third Brake Light (Center High‑Mount Stop Lamp) Provides A Clear, Elevated Brake Signal To Drivers Behind The Vehicle. Depending On The Vehicle Production Year And Specification, The Assembly May Contain Conventional Bulbs Or An Integrated LED Module. The Housing Includes The Light Source, Lens, Mounting Points, And Electrical Connector.
How The Part Is Replaced
Replacement Is Straightforward For Experienced Mechanics And Confident DIYers. Typical Steps:
- Access The Interior Trim Of The Rear Tailgate Or Roof Section To Reach The Mounting Screws/Clips.
- Remove The Fasteners And Carefully Lower The Old Unit From Its Housing.
- Disconnect The Electrical Connector And Inspect The Supply Cable For Damage (As Noted Above).
- Fit The New Assembly, Reconnect The Electrical Connector, And Secure All Fasteners With Correct Torque.
- Test The Brake Light Function (Brake Pedal Or Diagnostic Tool) Before Reassembling Interior Trim.
Installation Recommendations
- Verify That The Supply Cable And Connector Pins Are Undamaged And Free From Corrosion Before Installation.
- Replace Any Damaged Seals Or Gaskets To Prevent Water Ingress—A New Gasket Greatly Extends Service Life.
- Use Suitable Screwdriver Or Torx Drivers To Avoid Rounding Fasteners. Apply Mild Thread Locker If Specified By The Manufacturer.
- Check Alignment And Secure Fit To Avoid Vibrations And Rattles That Can Cause Premature Failure.
- If The Unit Contains An LED Module, Avoid Applying Excessive Force To The PCB Or Connector During Fitting.
- Disconnect The Battery Or Isolate The Circuit If You Work Near Airbag Or Sensitive Electronics To Reduce Risk Of Short Circuits.
Why This Part Typically Fails
- Water Ingress Through Deteriorated Seals Causing Corrosion Of Contacts Or Damage To The Lamp Module.
- Physical Damage From Rear Impacts Or Overloading Of The Tailgate Area.
- Connector Or Wiring Harness Damage—Chafing, Rodent Bite, Or Fatigue At The Plug.
- Aging Of Internal Components (Bulb Burnout Or LED Driver Failure) Over Time.
- Poor Electrical Contact Due To Corrosion, Causing Intermittent Operation.
Technical Information
- Manufacturer: Stellantis / Citroën (Original Equipment Part Numbers)
- Model: Citroën C4, C4 Cactus, DS4, C5 X7
- Product Codes: 9646804580, 6350V2, 6351HH, 6351EY
- Additional Numbers: Common Cross‑Reference Codes As Shown Above
Additional Notes
Always Inspect The Supply Cable Before Purchase As Noted In The Original Description. A Properly Installed And Sealed Third Brake Light Will Provide Reliable Service For Many Years; Failures Are Most Often Caused By Water Penetration, Wiring Damage, Or Impact. If You Maintain Connectors And Seals, Repeat Replacements Are Rare.
Recommendation For Professional Installation
For Best Results, Fitment Should Be Performed By A Qualified Technician Or An Experienced DIYer With The Correct Tools. Confirm Secure Mounting, Proper Electrical Contact, And Correct Operation Of The Light After Installation.
