B2402moderate severityBody
Blind Spot Monitor Sensor Circuit
on 2021 Lexus ES 250 AWD 2.5L I4 · FWD
What this code means
Malfunction in the blind spot monitoring (BSM) radar sensor, typically mounted in the rear bumper.
Symptoms
- Blind spot indicators not illuminating
- BSM warning light on dashboard
- System unavailable message
- False blind spot alerts
Common causes
- Faulty BSM radar sensor
- Sensor obstructed by bumper damage or dirt
- Sensor misaligned after rear collision
- Wiring damage
- Aftermarket trailer hitch blocking sensor
Diagnostic steps
- Clean rear bumper in sensor area
- Inspect for bumper damage near sensors
- Check sensor wiring
- Scan BSM module for codes
- Verify no aftermarket accessories blocking sensor
Repair notes
Replace BSM sensor or repair wiring. Recalibrate after replacement. Check for bumper damage blocking sensor field of view.
Other Body codes on this vehicle
B0001
Driver Frontal Stage 1 Deployment Control
B0002
Driver Frontal Stage 2 Deployment Control
B0003
Passenger Frontal Stage 1 Deployment Control
B0004
Passenger Frontal Stage 2 Deployment Control
B0005
Driver Knee Airbag Deployment Circuit
B0006
Passenger Knee Airbag Deployment Circuit
B0007
Rear Left Side Airbag Deployment Circuit
B0008
Rear Right Side Airbag Deployment Circuit
B0009
Rear Center Airbag Deployment Circuit
B0010
Driver Side Airbag Deployment