Description
Features
High-quality Valeo hazard warning light switch designed for PSA group vehicles. This unit operates the vehicle’s hazard lights and, on applicable models, interfaces with the central locking switch. Frequently searched by part numbers (40377877, 6554L0), it is suitable for technicians and DIYers who need a reliable direct-fit replacement for Xsara Picasso models.
Benefits
- Direct-fit replacement that saves installation time and avoids wiring modifications.
- OEM-quality design from Valeo for consistent switch feel and electrical contact.
- Commonly referenced by product numbers, making it easy to find the correct unit for PSA vehicles.
- Suitable for professional garages and competent DIY mechanics.
Common Symptoms Indicating Replacement
Drivers or technicians should consider replacing the switch if hazard lights fail to engage, the switch feels loose or sticks, the warning light on the dashboard behaves intermittently, or central locking functions (when integrated) stop responding. Typical causes include worn internal contacts, contamination or moisture ingress, and mechanical fatigue from repeated use.
Installation Guidance
Replacement is straightforward for experienced technicians or competent DIYers. General steps:
- Disconnect the negative battery terminal to prevent short circuits while working on the electrical system.
- Carefully remove the trim panel surrounding the switch using appropriate trim tools to avoid damaging clips and fascia.
- Release the retaining clips on the switch, pull the assembly out, and unplug the electrical connector(s).
- Fit the replacement switch, reconnect the connector(s), and test hazard and locking functions before reassembling the trim.
- Reinstall panels and reconnect the battery. Perform a final functional check.
If uncertain about procedure or if the model has integrated airbag or steering column electronics nearby, consult a workshop manual or a professional technician.
Common Failure Causes
- Electrical wear and oxidised contacts from long-term use.
- Ingress of moisture or dirt causing intermittent operation.
- Mechanical breakage of the switch housing or button due to repeated cycling.
- Faults in related wiring or fuses presenting as switch failure — always check fuses and wiring harnesses.
Technical Information
- Manufacturer: Valeo
- Model: Citroën Xsara Picasso (PSA Group Vehicles) — check compatibility with your vehicle before ordering
- Product Codes: 40377877, 6554L0
- Additional Numbers: 6554W9
Before purchase, compare the part numbers and connector shape with the original switch in your vehicle to ensure correct fitment. For compatibility beyond Xsara Picasso, refer to vehicle fitment lists or contact a technical advisor with your VIN. This description is intended to help mechanics and experienced DIYers choose the correct Valeo hazard switch quickly and confidently.
Order now to restore reliable hazard light operation and, where applicable, central locking control — essential for vehicle safety and compliance on the road.
