Description
Interior lighting controller for CITROËN and PEUGEOT vehicles
Product Overview
High-quality replacement interior lighting controller designed for professional workshops and experienced DIY motorists. This unit (reference 655421) operates the roof/dome light and reading/map lamps, delivering reliable on/off switching and illumination control inside the passenger compartment. Ideal for vehicles where the original switch has failed, become intermittent or lost tactile feedback. Common search terms include “interior light switch 655421”, “Citroën dome light controller” and “Peugeot interior light switch” which help technicians and spare-part buyers find the correct replacement quickly.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën Xsara; Citroën Xsara Picasso
- Product Codes: 655421
- Additional Numbers: No additional OE numbers provided
Functions And Features
The module controls interior courtesy lights and map/reading lamps, allowing manual on/off operation and, in many vehicle configurations, an automatic courtesy mode linked to door switches. It contains the user-facing switch assembly and the electrical connector to the vehicle wiring harness. Proper operation restores cabin lighting functions and eliminates flicker or loss of illumination caused by worn contacts.
Installation Recommendations
- Always disconnect the battery before starting to avoid short circuits or accidental airbag deployment and follow the vehicle manufacturer’s removal procedure.
- Use plastic trim tools to avoid damaging headliner and trim. Carefully pry out the dome lamp bezel and remove any retaining screws.
- Unplug the electrical connector from the old unit. Inspect the connector and wiring for corrosion or heat damage and clean if necessary.
- Fit the replacement unit (655421), connect the harness securely and test all lighting functions before reassembling trims.
- Reinstall trims and fasteners, reconnect the battery and verify operation of dome, map lights and door-activated courtesy function.
How To Diagnose
Symptoms of a failing interior lighting controller include lights that do not switch on, intermittent operation, lights stuck in one state, or physical deterioration of the switch. Preliminary checks should include fuses, bulb condition, and wiring continuity. Use a multimeter to verify power and ground at the connector; replace the switch if the supply is present but control signals are missing.
Why This Part Commonly Fails
Failures are typically caused by mechanical wear of switch contacts, contamination or corrosion in the electrical connector, moisture ingress (especially in vehicles with water leaks around the roof or windscreen), and electrical surges. Frequent use over many years accelerates contact wear; poor connector seating or damaged wiring can also lead to intermittent faults.
Practical Notes For Purchase
Part number 655421 is commonly used to locate this specific interior lighting controller. When ordering, verify that the listed models (Citroën Xsara and Xsara Picasso) match the vehicle in question and inspect the existing unit for visible connector and mounting style to ensure a direct replacement.
