Automatic Headlight Sensor Circuit
2017-2025 Renault Kwid 1.0L I3 SCe Flex 🇩🇪
Description
Malfunction in the automatic headlight ambient light sensor circuit.
Symptoms
- Auto headlights not turning on in tunnels/darkness
- Headlights on in bright daylight
- Auto headlight feature disabled
- Dash light sensor not adjusting brightness
Common Causes
- Faulty ambient light sensor
- Sensor covered by dashboard object
- Wiring damage
- BCM auto-light module fault
- Sensor window dirty
Diagnostic Steps
- Check light sensor reading with scan tool
- Clean sensor lens on dashboard
- Inspect sensor wiring
- Test BCM auto headlight output
- Verify feature is enabled in settings
Repair Notes
Replace ambient light sensor or clean sensor window. Check that nothing is covering the sensor on the dash top.
Related Codes
Other Body Codes
- B0001Driver Frontal Stage 1 Deployment Control
- B0002Driver Frontal Stage 2 Deployment Control
- B0003Passenger Frontal Stage 1 Deployment Control
- B0004Passenger Frontal Stage 2 Deployment Control
- B0005Driver Knee Airbag Deployment Circuit
- B0006Passenger Knee Airbag Deployment Circuit
- B0007Rear Left Side Airbag Deployment Circuit
- B0008Rear Right Side Airbag Deployment Circuit
- B0009Rear Center Airbag Deployment Circuit
- B0010Driver Side Airbag Deployment
B2100 on Other Vehicles
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2021-2024 1.3L I4 TCe
Renault Arkana
2021-2024 1.6L Hybrid
Renault Arkana
2021-2025 1.3L I4 TCe 140
Renault Arkana
2021-2025 1.6L I4 Hybrid E-Tech 145
Renault Arkana FR
2021-2025 1.3L I4 Turbo TCe 140
Renault Arkana FR
2021-2025 1.6L I4 Hybrid E-Tech 145
Renault Austral
2022-2025 1.2L I3 Hybrid E-Tech
Renault Austral
2022-2025 1.3L I4 TCe 140
Common Questions
What does code B2100 mean on a 2017-2025 Renault Kwid?
B2100 stands for "Automatic Headlight Sensor Circuit". Malfunction in the automatic headlight ambient light sensor circuit.
What are the symptoms of B2100 on a Renault Kwid?
Common symptoms of B2100 include: Auto headlights not turning on in tunnels/darkness, Headlights on in bright daylight, Auto headlight feature disabled, Dash light sensor not adjusting brightness.
What causes B2100 on a 2017-2025 Renault Kwid?
Common causes of B2100 include: Faulty ambient light sensor, Sensor covered by dashboard object, Wiring damage, BCM auto-light module fault, Sensor window dirty.