This right rear tail lamp (OE references 9655863980 / 6351T8) is designed for the Citroën C4 5-door and is ideal for professional mechanics and DIY enthusiasts searching by part number. The unit supplies rear position, brake and indicator lighting in one assembly and is commonly replaced after impact damage or long-term wear. Bulb sockets are not included with the housing and can be ordered separately if needed.

Technical Information

• Manufacturer: Citroën (Stellantis)
• Model: Citroën C4 (1st Generation) — 5-door
• Product Codes: 9655863980, 6351T8
• Other Numbers: 6351T8 (alternate reference)
• Position: Right Rear (Passenger Side)
• Light Type: Rear tail lamp assembly with replaceable bulbs (sockets sold separately)

Function and Benefits

• Combines tail, brake and turn-signal functions in one rear lamp assembly.
• Restores correct exterior lighting and safety for night driving and signaling.
• OE reference compatibility improves chances of a direct fit and correct alignment.
• Replacement housing simplifies repairs after minor collisions or lens damage.

Installation Recommendations

• Work Preparation: Park on level ground, switch off ignition and, as a safety precaution, disconnect the negative battery terminal when working on electrical components.
• Access: Open the boot and remove the inner trim or luggage panel to access the lamp fixing points.
• Removal: Unscrew or unclip the fasteners securing the lamp, carefully pull the assembly out a short distance and disconnect the electrical connector.
• Bulb Transfer: If reusing bulbs or bulb holders, transfer them to the new housing. If sockets are missing, fit the correct holders before installation.
• Reinstallation: Reconnect the electrical connector, check sealing surfaces and gaskets, position the lamp and secure fasteners evenly to avoid distorting the lens.
• Final Check: Test all lamp functions (tail, brake, indicator) before reassembling interior trim.

Most Common Failure Causes

• Impact damage from minor collisions or parking knocks that crack the lens or housing.
• Water ingress or condensation due to degraded seals, leading to corrosion of contacts and sockets.
• Corrosion or poor contact in bulb sockets and connectors causing intermittent function.
• UV and age-related fading or crazing of the plastic lens, reducing light output.
• Failed bulbs or loose connections—often the simplest cause but may require socket replacement if corrosion is present.

Searching by OE numbers 9655863980 or 6351T8 will help you quickly find this exact right rear lamp for Citroën C4 5-door models. Suitable for mechanics and experienced DIYers who need a straightforward replacement part to restore rear lighting and vehicle safety.

This rear lamp wiring harness is intended for mechanics and DIY enthusiasts who need a direct replacement for damaged or corroded tail-light connections on the Citroën C4 (five-door, first series). The harness routes power and signal to the rear combination lamp assemblies (tail, brake, indicator, reverse and rear fog where applicable) and provides the factory-style connectors for a straightforward swap. Common search terms include rear lamp wiring harness, tail light wiring loom, Citroën C4 wiring harness and the product codes 6350T8, 6351T8, 6534PC.

Technical Information

• Manufacturer: Stellantis (Citroën/Peugeot)
• Model: Citroën C4 I, 5-Door, First Series
• Product Codes: 6534PC
• Additional Numbers: 6350T8, 6351T8

Function And Application

The harness supplies electrical power and signal paths to the left and right rear light clusters. It contains individual circuits for tail lights, brake lights, indicators, reverse lights and rear fog where fitted. It is designed to mate with the original lamp connectors and the vehicle wiring loom to restore reliable lighting operation after connector damage or wiring failure.

Replacement Procedure

Replacement is typically performed as follows:

• Disconnect the negative battery terminal before starting any electrical work.
• Open the tailgate/boot and remove the trim panels to access the rear lamp mounting screws or clips.
• Remove the rear light cluster from the body to expose the lamp connector and harness routing.
• Unplug the old harness from the lamp and vehicle body connectors, taking note of routing and securing points (clips, grommets).
• Fit the new harness following the original routing, secure with clips and replace any grommets to prevent water ingress.
• Reconnect connectors, refit the lamp assembly and trim panels, then reconnect the battery and test all lamp functions (tail, brake, indicator, reverse, fog).

Installation Recommendations

• Always Disconnect The Battery Before Work To Avoid Short Circuits Or Damage.
• Use Dielectric Grease On Connectors In High-Moisture Areas To Reduce Corrosion.
• Inspect Connector Pins For Corrosion Or Bent Contacts And Clean Or Replace As Necessary.
• Ensure Proper Routing To Avoid Pinching Between Body Panels; Secure With Clips Or Cable Ties At Factory Attachment Points.
• After Installation, Verify All Light Functions From Both Sides And Check For Warning Messages On The Instrument Cluster.

Most Common Failure Causes

Rear lamp harnesses typically fail due to connector corrosion from moisture ingress, mechanical damage (impact or trunk loading), rodent chewing, or flex fatigue at fixed routing points. Poor repair history or improper sealing around grommets accelerates deterioration. Environmental exposure (road salt, humidity) increases the risk of oxidation and short circuits.

Durability And What To Expect

Service life depends on operating conditions; in dry, temperate environments a harness can last many years, while in coastal or salted-road regions signs of failure often appear earlier. Regular inspection during bodywork or lamp replacement helps detect problems before an electrical fault occurs.

Notes For Buyers

This harness is supplied as a replacement electrical lead for the left and right rear lamps on Citroën C4 five-door first series models. The item is offered without guaranteed functionality of bulbs, so bulbs and lamp units should be verified separately if required. Search by product codes (6350T8, 6351T8, 6534PC) for faster identification.