Compatible with multiple Citroën and Peugeot models, this switch is a direct replacement for the original part. It’s important to replace a worn or faulty brake switch to maintain proper brake function and avoid potential safety hazards. Common signs of a failing brake switch include malfunctioning brake lights, difficulty in starting the vehicle, or unexpected activation of the cruise control system.

Replacing the brake switch is a straightforward process that typically involves disconnecting the battery, removing the old switch, and installing the new one in its place. Regular inspection of this component is recommended, especially in older vehicles, to ensure it remains operational.

Technical Information

Manufacturer: PSA
Model: Citroën, Peugeot
Product Codes: 9643478880, 453440
Additional Numbers: N/A

Over time, brake light switches may fail due to factors such as wear and tear, electrical issues, or exposure to extreme temperatures. Regular inspection and replacement of this switch are essential to maintain driving safety and compliance with road regulations.

Installation of the Brake Light Switch is straightforward, making it an ideal choice for both professional mechanics and DIY enthusiasts. Simply locate the switch, disconnect the old unit, and replace it with the new switch to ensure your brake lights operate reliably.

Technical Information

• Manufacturer: Citroën
• Model: Citroën, Peugeot
• Product Codes: 9650688480, 9665602380
• Additional Numbers: 453448, 453463, 453465, 453467

High-quality replacement tailgate (boot) release switch designed for Citroën C4 and Peugeot 308 T7 vehicles. Ideal for professional technicians and DIY enthusiasts who need a reliable, easy-to-fit switch to restore correct boot opening function. Commonly searched under part number 6490R3 (also referenced as 6490.R3), this switch reinstates mechanical and electrical control of the tailgate opening mechanism, improving vehicle usability and eliminating intermittent faults caused by worn contacts or moisture ingress.

Technical Information

• Manufacturer: Stellantis (Citroën/Peugeot)
• Model: Citroën C4 II, Peugeot 308 (T7)
• Product Codes: 6490R3, 6490.R3
• Additional Numbers: None listed

Compatibility And Use

This tailgate release switch is intended for vehicles in the Citroën C4 and Peugeot 308 families where the original switch uses the same mounting and electrical connector. It is suitable for replacing faulty or mechanically damaged switches to restore normal central locking and tailgate release operation. Use the part number (6490R3) when searching catalogs to find matching trim variants and connector types.

Installation Recommendations

• Always observe standard safety procedures when working on vehicle electrics. Disconnect the vehicle battery before starting work to avoid short circuits and accidental activation.
• Remove the tailgate interior trim carefully (start at push clips and fasteners) to access the switch mounting. Keep all trim clips for reuse if undamaged.
• Unplug the electrical connector and, if present, release any retaining clips or screws holding the switch. Note connector orientation for reassembly.
• Fit the replacement switch, secure with original fasteners, reconnect the harness and test the tailgate release function before refitting the trim.
• Check seals and drainage paths in the tailgate area; ensure the new switch is correctly seated to avoid water ingress.

Common Failure Causes

• Moisture Ingress: Water or condensation inside the tailgate can corrode electrical contacts and cause intermittent or permanent failure.
• Mechanical Wear: Frequent use and repeated actuation wear internal contacts and plastic components, leading to poor electrical connection or broken mounting tabs.
• Corrosion Of Connectors: Exposure to road salts and humidity can corrode pins and sockets in the wiring harness.
• Impact Or Damage: Shock to the tailgate or improper removal of trim can crack switch housing or break retaining clips.

Quick Diagnostic Tips

• Test the switch function by actuating it while monitoring the tailgate release mechanism; listen for the actuator and observe any response from the central locking system.
• Measure continuity with a multimeter across switch terminals to verify contact operation when pressed.
• Inspect connector pins for corrosion or bent pins and check wiring continuity back to the central locking module if no response is detected.

Why Choose This Part

Replacing a failing tailgate release switch with a correctly coded part (searchable as 6490R3 / 6490.R3) restores convenience features and prevents repeated failures from causing secondary damage to actuators or lock mechanisms. Suitable for professional workshops and experienced DIYers, this switch offers a direct, cost-effective repair option that improves vehicle reliability and user experience.

Product Overview

This inertial impact sensor (crash sensor) is designed to interrupt the fuel supply in the event of a significant deceleration or collision, protecting the vehicle from uncontrolled fuel delivery. The unit is compatible with a range of Citroën and Peugeot models and is commonly searched for under product codes 636654 and 1477226080. The item shows a minor tear on the rubber boot but remains fully functional.

Function And Fitment

The sensor detects rapid deceleration and sends a signal to shut off the fuel pump or fuel supply relay, preventing fuel flow after an impact. It is typically installed in the engine bay or inside the passenger compartment close to the firewall, depending on the model. Proper orientation and secure mounting are important for reliable operation.

Technical Information

• Manufacturer: Stellantis (Citroën / Peugeot)
• Model: Citroën Berlingo; Citroën Xsara; Citroën Xsara Picasso; Peugeot 306; Peugeot 406; Peugeot 607; Peugeot Partner
• Product Codes: 636654, 1477226080
• Additional Numbers: 1477226080, 636654

Installation Recommendations

Recommended procedure for replacement:

• Always disconnect the battery before starting work and wait a few minutes to ensure systems are powered down.
• Locate the sensor according to the vehicle model (engine bay or under-dash area). Refer to vehicle workshop manual for exact location.
• Disconnect the electrical connector carefully to avoid damaging terminals; inspect connector for corrosion or bent pins.
• Remove the mounting fastener(s) and replace the sensor, ensuring the correct orientation and secure mounting.
• Reconnect the connector and battery. If necessary, clear any related fault codes with diagnostic equipment and verify fuel pump operation.
• Use dielectric grease on connector contacts if exposed to moisture to improve long-term reliability.

Why This Part Most Commonly Fails

Common failure causes include water ingress and corrosion of the connector, mechanical damage from previous impacts, or degradation of the rubber boot that allows contaminants inside. Electrical faults may also occur due to wiring damage or corrosion. In this specific unit the rubber part is slightly damaged, which currently does not affect function but can shorten service life if moisture reaches internal components.

Notes For Mechanics And DIYers

Search engines and professional buyers often look up this part by codes 636654 and 1477226080, so including these numbers when listing or ordering helps ensure the correct item. Follow manufacturer procedures and torque specifications when mounting. If fault codes persist after replacement, check wiring and associated relays, and perform diagnostics with appropriate PSA-capable tools if required.