Description
Solar radiation intensity sensor suitable for Peugeot 307, 308, 406, 3008 and 5008 and Citroën C4, C4 B7.
The Solar Radiation Sensor 9833418780 / 6445NH is a direct-fit component for climate control systems on many Citroën and Peugeot models. It measures incoming sunlight and feeds the information to the automatic climate control to adjust fan speed, air distribution and temperature balancing for consistent cabin comfort. Ideal for workshops and experienced DIY mechanics, this sensor improves climate control responsiveness after a failure or when replacing damaged dashboard trim. Common search terms include sun sensor, solar sensor, sunlight sensor, climate sensor and the part numbers 9833418780 and 6445NH.
Technical Information
- Manufacturer: Stellantis (Citroën Peugeot)
- Model: Fits Peugeot 307, Peugeot 308, Peugeot 406, Peugeot 3008, Peugeot 5008, Citroën C4, Citroën C4 B7
- Product Codes: 9833418780, 6445NH
- Additional Numbers: No further reference numbers available
Installation Recommendation
Locate the sensor on the dashboard close to the base of the windshield, typically centered or slightly offset depending on model. Remove the required trim panels carefully with proper trim tools to avoid cracking plastic. Disconnect the electrical connector by releasing the locking tab and swap the sensor, ensuring the sensor is fitted in the same orientation as the original. Secure trim panels back in place without forcing clips. Keep contacts clean and dry and avoid touching electronic terminals with bare hands.
Replacement Procedure
- Remove dashboard trim pieces to access the sensor area near the windshield.
- Release the connector locking clip and unplug the sensor harness.
- Remove the sensor from its mounting, noting the orientation and seating position.
- Install the new sensor in identical position and reconnect the harness until the locking tab engages.
- Reassemble trim and verify correct fitment. Power the vehicle systems and check climate control response; if available, monitor the sensor signal with a diagnostic tool.
Why This Part Most Often Fails
- Moisture ingress and condensation leading to corrosion or short circuits.
- Plastic housing cracking from prolonged heat and UV exposure.
- Damaged or corroded electrical connector contacts, often caused by water leaks or poor sealing at the windshield.
- Mechanical damage during dashboard or trim removal.
- Internal electronic degradation after many years in service.
Search using the part numbers 9833418780 and 6445NH or the vehicle model names to find the correct sun sensor quickly. This unit is a practical replacement for restoring reliable automatic climate control behavior on compatible Citroën and Peugeot models.
