B2AAAlow severityBody
Rain/Light Sensor Circuit Malfunction
on 2018 Lincoln MKX 2.7L EcoBoost V6 · AWD
What this code means
Malfunction in the rain and light sensor mounted on the windshield behind the rearview mirror. The sensor controls automatic wipers and headlights.
Symptoms
- Auto wipers not working
- Wipers activating in dry conditions
- Auto headlights not responding
- Rain sensor indicator flashing
Common causes
- Faulty rain/light sensor
- Windshield replacement with incorrect glass
- Sensor lens contaminated
- Wiring to sensor damaged
- Sensor mounting gel pad deteriorated
Diagnostic steps
- Clean sensor lens area on windshield
- Check sensor mounting and gel pad
- Verify windshield is compatible with sensor
- Test sensor output with scan tool
- Inspect wiring at rearview mirror base
Repair notes
Replace rain/light sensor or reinstall with new gel pad. Ensure windshield has sensor-compatible coating.
Other Body codes on this vehicle
B0001
Driver Frontal Stage 1 Deployment Control
B0001
Driver Frontal Stage 1 Deployment Control
B0002
Driver Frontal Stage 2 Deployment Control
B0002
Driver Frontal Stage 2 Deployment Control
B0003
Passenger Frontal Stage 1 Deployment Control
B0003
Passenger Frontal Stage 1 Deployment Control
B0004
Passenger Frontal Stage 2 Deployment Control
B0004
Passenger Frontal Stage 2 Deployment Control
B0005
Driver Knee Airbag Deployment Circuit
B0005
Driver Knee Airbag Deployment Circuit