Light Sensor — Maruti Suzuki Swift
Category: Interior | Severity: medium | Cost: ₹3,000–₹10,000
What is Light Sensor?
Detects ambient light conditions and automatically turns headlights ON or OFF.
How Light Sensor Works
Measures surrounding light intensity using a photodiode and sends signals to the car’s ECU to control headlights.
Why is Light Sensor Important?
Enhances safety by ensuring headlights are activated in low-light conditions without driver input.
Common Problems
- Sensor not detecting darkness
- Headlights turning on/off incorrectly
- Delayed response
Symptoms
- Headlights not turning on at night
- Headlights turning on during daytime
- Flickering auto headlamp behavior
Causes of Failure
- Dust or obstruction on sensor
- Electrical issues
- Faulty sensor module
Impact on Car Performance
Reduced visibility at night or unnecessary battery usage.
DIY Fix Guide — Step by Step
- Clean dashboard sensor area
- Check headlight settings
- Restart vehicle system
Maintenance Tips
- Keep dashboard clean
- Avoid placing objects over sensor
- Regular electrical inspection
Replacement Cost in India
Estimated range: ₹3,000 – ₹10,000
Where to Buy Online
When to Replace Light Sensor
When headlights fail to respond correctly to ambient light conditions.