As a necessary part of the vehicle’s electrical system, the Interior Lighting Control is responsible for the operation of various lights inside the car, including dome lights and footwell illumination. It ensures that the interior lights function effectively, especially when entering or exiting the vehicle.

Mechanics and DIY enthusiasts will find this part easy to replace, with a typical procedure involving the removal of the old switch and installation of the new one, making it a straightforward fix for anyone familiar with basic automotive repair.

With components like the 6552T1, which is often sought after by both professional and amateur mechanics, you can be confident in restoring the functionality of your vehicle’s lighting system.

Technical Information

• Manufacturer: PSA
• Model: Citroën Peugeot 6552T1
• Product Codes: 6552T1
• Other Numbers: NFP

The Interior Light Controller 655421 is a direct-replacement electrical switch module designed for overhead and ambient lighting circuits in Citroën and Peugeot vehicles. Built for reliable operation in workshop environments, this unit restores correct on/off control and dimming of roof, map and courtesy lamps. It is particularly useful for professional technicians and skilled DIYers who frequently search by the product code 655421 when repairing interior lighting faults.

Technical Information

• Manufacturer: Stellantis (Citroën, Peugeot)
• Model: Citroën Xsara; Citroën Xsara Picasso
• Product Codes: 655421
• Other Numbers: No additional reference numbers available in the provided data

Installation Recommendations

Before starting any work, disconnect the negative battery terminal to prevent short circuits and accidental airbag deployment. Typical replacement procedure: remove the roof console or lens cover using plastic trim tools, remove retaining screws or clips, unplug the electrical connector and extract the old switch module. Install the new controller, reconnect the connector and test all functions (map lights, courtesy lights, dimmer). Reassemble trim carefully, ensuring clips are engaged. Recommended workshop time for an experienced technician: approximately 15–30 minutes. Inspect connector pins and wiring harness for corrosion or damage and clean contacts if required.

Common Failure Reasons

The most frequent causes of failure are mechanical wear of the internal switch contacts after long service, corrosion or moisture ingress at the connector, and electrical issues caused by faulty bulbs or aftermarket installations. Symptoms include intermittent operation, stuck or unresponsive switch positions and complete loss of interior lighting control. Preventative measures include checking connector seals, using bulbs to manufacturer specifications and avoiding excessive force on the switch actuation.

Fitment And Usage Notes

This part is commonly searched for by its part number 655421 and fits Citroën Xsara and Citroën Xsara Picasso models. It is used in interior lighting assemblies across certain Citroën and Peugeot vehicles. The unit is intended for direct swap replacement and typically does not require coding for basic on/off and dimmer functions.