Description
Rear upper tail light socket harness for Citroën C5 I and II Estate. Functionality of the bulb itself is not guaranteed.
This replacement rear upper tail light socket harness is a direct-fit solution designed for Citroën C5 Estate models and is often searched under the product code 6534KA. Ideal for professional mechanics and skilful DIYers, the harness restores reliable electrical contact for the rear upper lamp, reduces intermittent failures caused by degraded sockets or wiring, and simplifies a targeted repair without replacing the entire lamp cluster. Keywords: Rear Tail Light Socket Harness, Citroën C5, C5 Estate, 6534KA, Taillight Wiring, Lamp Holder.
Technical Information
- Manufacturer: Stellantis / Citroën
- Model: Citroën C5 I Estate (Break) and Citroën C5 II Estate (Break)
- Product Codes: 6534KA
- Additional Numbers: NFP (as marked)
What This Part Does
The harness supplies the electrical connection and mechanical support for the rear upper tail lamp socket. It transmits power to the bulb and ensures a secure ground return. A worn or damaged socket harness can cause the lamp to flicker, fail intermittently, or stop working entirely while the bulb itself may still be serviceable.
Installation Recommendations
- Disconnect the negative battery terminal before starting electrical work to avoid short circuits.
- Access the rear lamp from inside the trunk by removing the trim panel covering the lamp cluster.
- Unfasten the lamp cluster retaining screws or clips and carefully withdraw the cluster to reach the harness and socket.
- Release the old harness connector from the lamp housing and remove any retaining clips. Note connector orientation for correct reassembly.
- Fit the new harness into the lamp housing, secure clips, and reconnect electrical plugs. Use a small amount of dielectric grease on contacts to improve corrosion resistance and electrical contact.
- Refit the lamp cluster and interior trim, reconnect the battery, and verify all rear lamp functions (tail, brake, indicator, and reverse lamps as applicable).
- When replacing bulbs at the same time, avoid touching halogen glass with bare fingers; use clean gloves or a lint-free cloth.
Most Common Failure Reasons
Failures are typically caused by corrosion of the contacts, heat and vibration fatigue, or mechanical damage to the socket and wiring. Moisture ingress into the lamp housing accelerates connector corrosion. Repeated bulb replacement or a loose fit can wear the socket contacts, producing intermittent connections. Poor grounding or chafed wiring from rubbing against bodywork may also lead to complete loss of lamp function.
Replacing only the harness/socket is a cost-effective repair that restores reliable operation when the lamp cluster and bulbs are otherwise serviceable. For long-term reliability, ensure seals around the lamp housing are intact and connectors are clean and properly seated.
