This replacement display is designed for mechanics and skilled DIY enthusiasts who need a reliable screen for the Citroën C4 I. Commonly searched by product numbers 9665614780, 9665614780-01, 6155GX and 6155GY, the unit restores clear readout of radio information, menu navigation and vehicle trip/computer data. The display fits original PSA radio and infotainment assemblies and is a practical service item when the factory screen shows dead pixels, faded backlight or intermittent communication with the head unit.

Technical Information

• Manufacturer: Stellantis / Citroën
• Model: Citroën C4 I (first generation)
• Product Codes: 9665614780, 9665614780-01
• Additional Numbers: 6155GX, 6155GY

Function

The display provides visual output for the radio and the onboard computer: station and track data, menu navigation, clock and trip/computer readouts (fuel consumption, range, average speed). It interfaces with the vehicle’s radio/information controller via multi-pin connectors and communicates status and settings to the driver.

Compatibility and Fitment

Primarily intended for Citroën C4 first-generation models (C4 I, approx. 2004–2010) equipped with PSA radio units that use the 6155GX / 6155GY series displays. Always verify the part numbers printed on the original display or radio housing before ordering; many customers search directly using the numbers 9665614780 or 6155GX.

Replacement Procedure

Suitable for experienced mechanics and competent DIYers. Typical replacement steps:

1. Disconnect the negative battery terminal to avoid electrical damage or short circuits.
2. Remove surrounding trim panels carefully using plastic trim tools to avoid scratching. Keep fasteners and clips organized.
3. Unscrew and slide out the radio/information unit as required to access the display. Some radios require removal of the full chassis.
4. Unplug the display’s ribbon and wiring connectors. Note connector orientation and locking mechanisms.
5. Fit the replacement display, reconnect the ribbon and connectors, reassemble the radio and trim in reverse order.
6. Reconnect the battery and verify display operation and menu navigation. Check for stable backlight and responsiveness.

Installation Recommendations

• Always disconnect the battery before beginning work.
• Use plastic trim removal tools to avoid damaging dashboard surfaces.
• Handle the LCD and ribbon cable carefully; do not crease or overstress flex cables.
• Ensure connectors are clean and fully engaged. Corrosion or loose pins are common causes of intermittent faults.
• If the radio unit requires deeper disassembly, document screw locations and connector positions to ensure correct reassembly.

Why This Part Most Often Fails

• Backlight deterioration: LEDs or diffuser layers age, causing dim or uneven illumination.
• Dead pixels or LCD damage: thermal stress, impact or manufacturing wear can create black spots or lines.
• Connector and ribbon cable faults: flex cable wear, broken traces or poor contact lead to intermittent or total loss of image.
• Moisture ingress and contamination: humidity or condensation inside the dash can corrode contacts and circuit traces.
• Electronics ageing: failing components on the display driver board (solder joints, capacitors) can cause malfunction.

Troubleshooting Tips

• If the display is dim but visible, check contrast/brightness settings first and inspect backlight power lines.
• Intermittent blanking often points to loose ribbon cables or connector corrosion—reseating connectors can restore function.
• Persistent artefacts or lines usually indicate LCD panel damage and require replacement.

Notes For The Buyer

This listing uses common PSA part numbers to help with search and fitment. The display is a direct-fit replacement for units identified by the above product codes; installing mechanics should follow the replacement procedure and installation recommendations to avoid damage during service.

This replacement display is designed for Citroën C4 first-generation vehicles and is commonly referenced by part numbers 9659062780 and 6155FW (also found as 6155FX / 6155GX). Ideal for professional workshops and experienced DIY mechanics, the unit restores clear information readout for radio menus, trip computer and driver information. Correct fitment ensures full functionality of the factory radio and onboard computer display, improving user experience and maintaining vehicle appearance.

The display is a direct-fit component for vehicles equipped with the 6155-series radio/telematics cluster. It is often searched by its OEM codes, so including the part number in searches will increase the chance of finding the correct replacement quickly. The unit is suitable for repairs where the original screen shows dead pixels, faded backlight, distorted characters or intermittent communication with the radio head unit.

Technical Information

• Manufacturer: Stellantis / Citroën
• Model: Citroën C4 I (First Generation)
• Product Codes: 9659062780, 6155FW, 6155FX, 6155GX
• Other Numbers: Commonly referenced in parts lists and labels as 6155FW | 9659062780

Installation Recommendations

Installation should be performed by a trained technician or an experienced DIYer with appropriate tools. Recommended steps:

• Disconnect the negative battery terminal before starting to prevent short circuits and protect vehicle electronics.
• Remove surrounding trim panels carefully to avoid breaking plastic clips. Use trim tools to prevent damage.
• Unscrew the radio/display assembly fixing screws and slide the unit forward to access connector plugs.
• Release the locking tabs on the multi-pin connectors and unplug them; handle ribbon cables gently to avoid creasing or tearing.
• Swap the old display for the new unit, reconnect all plugs and secure the assembly. Refit trim panels and reconnect the battery.
• After installation, verify display illumination, menu navigation, and that the on-board computer information displays correctly.

Most Common Failure Reasons

Display failures on first-generation Citroën C4 vehicles typically occur due to age-related factors and environmental stress. Common causes include:

• Backlight degradation or failed LEDs causing dim or uneven illumination.
• Cold or cracked solder joints on the display controller or connection points leading to intermittent operation, often worsened by vibration and temperature cycles.
• Damaged ribbon cables or connector pins from improper handling during previous repairs or removal.
• Moisture ingress or contamination causing corrosion on contacts and PCB traces.

On vehicles older than a decade, degradation of components and repeated thermal cycling make display faults more likely. Replacing the display restores readability and reliable operation when the failure is limited to the screen assembly.

Replacement display unit for the radio and trip computer designed for Citroën C4 first generation. This unit is commonly searched by part numbers 9664222180 and 6155FX (also referenced as 6155GX, 6155FW). Ideal for Professional Mechanics And Experienced DIYers who need a direct-fit display to restore readability and functionality of the dash information system. The display restores essential functions such as radio information, clock, trip computer readouts and on-screen status icons, improving driver feedback and safety.

Key Benefits

• Direct Fit For Citroën C4 I With Original Connector Layout
• Restores Radio And Trip Computer Readability
• Often Found By Part Number Searches 9664222180 / 6155FX
• Useful For Garage Repairs, Bodyshop Replacements And In-Depth Dashboard Restorations

How Replacement Works

Replacement Is Straightforward For Workshops: After ensuring the Vehicle Is Secure And The Battery Is Disconnected, remove the trim pieces around the center dash, undo the mounting screws or clips securing the display module, carefully unplug the ribbon and power connectors and swap the units. Before reassembly, test All Functions Including Radio Display, Clock, And Trip Computer Messages To Confirm Proper Operation.

Installation Recommendations

• Always Disconnect The Battery Before Starting Work To Avoid Short Circuits Or Damage To Electronic Components.
• Use Appropriate Trim Tools To Avoid Breaking Clips And To Protect Interior Surfaces.
• Take Care With Ribbon Cables And Connectors; Do Not Bend Or Crease Flex Cables Excessively.
• Test The New Display Before Final Reassembly To Ensure All Icons, Backlight And Communication With The Head Unit Or BCM Are Functional.
• If The Display Does Not Power On Or Shows Partial Information, Recheck Connector Seating And Fuse Circuits Related To The Infotainment/Instrument System.

Why The Part Typically Fails

Display Failures On Citroën C4 First Generation Are Most Common On Older Vehicles Due To Prolonged Exposure To Heat, Temperature Cycles And Moisture. Typical Faults Include Backlight Loss, Dim Or Dead Pixels, Intermittent Connections In Ribbon Cables, Corroded Connector Pins And Solder Joint Failures On The Display PCB. Mechanical Damage From Accidents Or Improper Removal Can Also Cause Permanent Failure.

Practical Tips For Diagnosis

• Confirm Power And Ground At The Unit Before Replacing The Display To Avoid Replacing A Good Part.
• Intermittent Problems Often Point To Connector Or Solder Issues Rather Than The LCD Panel Itself.
• When Replacing The Unit, Keep The Old Part For Reference On Connector Types And Mechanical Fixings.

Technical Information

• Manufacturer: Citroën (Stellantis)
• Model: Citroën C4 First Generation (C4 I)
• Product Codes: 9664222180, 6155FX
• Other Numbers: 6155GX, 6155FW

Keywords For Search Engines And Workshops: Citroën C4 Display, 9664222180, 6155FX, Radio Display, Trip Computer Display, Dashboard Display Replacement, C4 I Display.