Description
Sunlight sensor for Citroën Peugeot vehicles
The Sunlight Sensor 6445V6 (NFP) is a direct-fit replacement sensor designed for Citroën and Peugeot vehicles equipped with automatic climate control. This sensor measures solar radiation intensity and provides the climate control unit with input to adjust blower speed, temperature mixing and sun-facing zone compensation — improving passenger comfort and reducing unnecessary HVAC load. Commonly searched under part number 6445V6, this unit is ideal for mechanics and DIY enthusiasts who need a reliable component to restore correct automatic climate function.
Benefits for Professionals and DIYers: quicker diagnostics and replacement, restores proper cabin temperature regulation, prevents overworking of the A/C compressor and blower, and helps eliminate complaints about uneven heating or cooling across the cabin. The part is compact, electrically connected to the vehicle’s HVAC harness and usually accessed from the dashboard area near the windshield.
Technical Information
- Manufacturer: Stellantis (Citroën/Peugeot)
- Model: Peugeot 406. Also Fits Various Citroën And Peugeot Models Equipped With Automatic Climate Control
- Product Codes: 6445V6, NFP
- Other Numbers: No Additional Numbers Provided
Function And Symptoms
The sensor detects the intensity and angle of incoming sunlight and sends a proportional electrical signal to the climate control module. When the sensor is faulty or disconnected, common symptoms include incorrect cabin temperature, abrupt temperature swings, excessive blower activity, or the automatic climate system failing to compensate for sun load. In some vehicles a dashboard warning or HVAC fault code may be logged when the sensor circuit is open or out of range.
Installation Recommendations
- Preparation: Park on level ground, switch off ignition and follow vehicle safety procedures. Disconnect the negative battery terminal if recommended by the vehicle’s service manual before working on dashboard electrical components.
- Access: The sensor is usually located on top of the dashboard under a trim piece or inside a dedicated sensor housing near the base of the windshield. Remove the trim carefully to avoid damaging clips and surrounding finish.
- Replacement: Unplug the electrical connector, release any retaining clips, replace the sensor with the new unit and reconnect. Ensure connector pins are clean and fully engaged.
- Testing: Reconnect battery if disconnected, start the vehicle and verify HVAC operation. Observe automatic climate responses to sunlight (or shade test) and check for stored HVAC fault codes with a scan tool if available.
- Tools: Typical hand tools (trim tools, screwdriver set) and a basic OBD/diagnostic tool for fault verification are sufficient for most replacements.
Common Failure Causes
- Connector Corrosion Or Poor Electrical Contact — Moisture Ingress Or Age Can Cause High Resistance Or Intermittent Signals.
- Physical Damage — Dashboard Impact, Sunshield Removal Or Interior Work Can Crack The Sensor Or Its Housing.
- Degradation From Long-Term UV/Heat Exposure — Prolonged Exposure To Solar Radiation And Heat Cycles May Affect Sensor Optics Or Electronics.
- Wiring Harness Damage — Rodent Damage Or Mechanical Chafing Can Interrupt The Signal Path.
Typical Service Life: The sensor is designed for long service life, but failures are more likely on older vehicles or where water ingress and connector issues have occurred. When replacing, inspect the connector and wiring for corrosion or damage to prevent repeat faults.
Keywords: Sunlight Sensor, Solar Sensor, Climate Sensor, 6445V6, Citroën, Peugeot, Peugeot 406, Automatic Climate Control
