Description
Sunlight sensor for Citroën and Peugeot vehicles.
Product Overview
The Sunlight Sensor 6445VA is a direct-fit replacement sensor used on a range of Citroën and Peugeot models to measure solar radiation striking the cabin. The sensor supplies the vehicle’s climate control system with real-time sunlight data so automatic heating, ventilation and air conditioning (HVAC) can compensate for solar load and maintain a stable, comfortable interior temperature. Frequently searched by part number (6445VA), this sensor is a common service item for workshops and DIY enthusiasts working on Citroën C5 and Peugeot 407 models.
Function And Benefits
This sensor detects solar intensity and sends an electrical signal to the climate control module. Based on that signal the HVAC system adjusts blower speed, blend doors and temperature settings to prevent overheating of the cabin or unnecessary air conditioning load. Replacing a faulty sunlight sensor restores accurate solar compensation, improves passenger comfort and can reduce unnecessary AC runtime (and therefore fuel consumption).
Compatibility
Typical Fitment: Citroën C5, Peugeot 407. Often Identified By: Part Number 6445VA. Always verify physical match and connector type when replacing a unit.
How It Fails And Typical Lifespan
Sunlight sensors are generally durable and can last many years, but common failure modes include moisture ingress, connector corrosion, internal component drift from prolonged UV and heat exposure, or physical damage during dashboard repairs. Symptoms of a failing sensor include incorrect automatic climate behavior, excessive or insufficient blower activity under sunlight, or stored HVAC fault codes.
Replacement Procedure
1) Disconnect Battery Before Starting Work. 2) Remove Trim Panels Or Dash Covering The Sensor (location is usually on top of the dashboard near the base of the windshield). 3) Unplug Electrical Connector And Release Mounting Clips. 4) Fit The New Sensor Ensuring The Sensor Window Faces The Windshield And The Connector Is Fully Seated. 5) Reassemble Trim And Reconnect The Battery. 6) Verify HVAC Operation And Clear Any Related Fault Codes With A Diagnostic Tool If Necessary.
Installation Recommendations
Always disconnect the battery before removal and follow the vehicle manufacturer’s instructions for interior trim removal to avoid breaking clips or damaging the dash. Inspect the connector and wiring harness for corrosion or damage and repair as needed. After installation, check the climate control’s response in sunlight conditions and, if the vehicle stores HVAC fault codes, use a diagnostic scanner to clear errors and confirm proper sensor input.
Technical Information
- Manufacturer: Stellantis / Citroën / Peugeot
- Model: Citroën C5; Peugeot 407
- Product Codes: 6445VA
- Additional Numbers: NFP
Why This Part Is Frequently Replaced
Failure Often Results From Environmental Exposure (UV, Heat, Moisture) Or From Damage During Dashboard Work. Because The Sensor Directly Affects Climate Comfort, Symptoms Are Noticeable To Drivers And Are Typically Replaced To Restore Proper Automatic HVAC Function.
Who Should Fit This Part
The sensor is suitable for experienced DIYers and professional mechanics. If HVAC faults persist after replacement, use a diagnostic tool to check sensor signal and related control module inputs.
