Description
Control Unit – Automatic Headlight Correction Unit for Citroën C4 and C5 II vehicles.
Valeo Headlight Control Unit for Xenon systems, designed for selected Citroën and Peugeot applications. This unit manages automatic leveling and correction of the headlamp beam to maintain correct illumination under varying load and ride-height conditions. Ideal for professional mechanics and experienced DIYers looking for a direct-fit replacement identified by OEM numbers. Customers frequently search by product codes such as 9651116480 or 6224K8, so verifying the part number against the damaged unit helps ensure correct selection.
Technical Information
- Manufacturer: Valeo
- Model: Citroën C4; Citroën C5 II
- Product Codes: 9651116480; 6224K8
- Other Numbers: 6224R6; 6224R5; NFP; Stellantis OEM references
Function And Symptoms
The Unit Controls Automatic Leveling Of Xenon Headlights By Receiving Signals From Ride-Height Sensors And Adjusting The Headlamp Aim Via Internal Actuators Or By Controlling External Motor Drives. Common Symptoms Of A Faulty Unit Include Headlight Warning Messages, Incorrect Beam Aim, Flickering Or Intermittent Light Output, And Loss Of Adaptive Functions.
Installation Recommendations
- Disconnect The Negative Battery Terminal Before Starting Work To Avoid Electrical Damage.
- Locate The Control Unit—Usually Mounted Near The Headlamp Housing Or Inside The Engine Compartment Behind Protective Covers; Some Vehicles Require Partial Removal Of The Headlamp To Access The Module.
- Carefully Unplug Electrical Connectors And Check For Corrosion Or Bent Pins; Replace Damaged Pins If Necessary.
- Fit The Replacement Unit In Reverse Order. Ensure Fasteners And Seals Are Properly Reinstalled To Maintain Water Protection.
- After Mechanical Installation, Perform Electrical Checks: Verify Connector Continuity, Fuses, And Ground Connections.
- Initialization Or Coding May Be Required On Some Vehicles Using Manufacturer Diagnostic Tools (For Example Lexia/DiagBox Or Equivalent) To Restore Full Functionality.
- Observe Safety Precautions With Xenon Systems: Avoid Touching High-Voltage Components And Bulb Surfaces; Follow Manufacturer Safety Guidelines.
Why The Part Fails Most Often
Failures Usually Result From Environmental And Electrical Stress. Common Causes Include Moisture Ingress And Corrosion Of Connectors, Thermal Cycling And Component Ageing, Voltage Spikes Or Poor Grounding, And Physical Damage From Impacts Or Water Exposure. Faults In Ride-Height Sensors Or Wiring Can Also Cause The Unit To Appear Faulty.
Practical Tips For Diagnosis
- Check Associated Fuses And Wiring Harnesses Before Replacing The Control Unit.
- Inspect Connectors For Corrosion; Clean And Protect Contacts With Appropriate Dielectric Grease.
- If Symptoms Persist After Replacement, Verify Ride-Height Sensor Readings And Communication On The Vehicle CAN Bus With A Diagnostic Tool.
- Search By OEM Part Number (9651116480, 6224K8) To Confirm Compatibility With The Vehicle.
This unit Is Intended For Mechanics And Skilled Enthusiasts Comfortable With Electrical Diagnostics And Handling Xenon Lighting Components. Proper Installation And Any Required Coding Restores Correct Headlight Aim And Ensures Safe Nighttime Visibility.
