
The rear radars are located inside the rear bumper for detecting the side and rear areas. Always keep the rear bumper clean for proper operation of the system.
NOTICE
Warning message

Blind-Spot Collision Warning (BCW) system disabled. Radar blocked
This warning message may appear when:
- One or both of the sensors on the rear bumper is blocked by dirt or snow or
a foreign object.
- Driving in rural areas where the sensor does not detect another vehicle for an
extended period of time.
- When there is inclement weather such as heavy snow or rain.
If any of these conditions occur, the light on the BCW switch and the system will turn off automatically.
When the BCW canceled warning message is displayed in the cluster, check to make sure that the rear bumper is free from any dirt or snow in the areas where the sensor is located. Remove any dirt, snow, or foreign material that could interfere with the radar sensors.
After any dirt or debris is removed, the system should operate normally after about 10 minutes of driving the vehicle.
If the system still does not operate normally have your vehicle inspected by an authorized HYUNDAI dealer.

Check Blind-Spot Collision Warning (BCW) system
If there is a problem with the BCW system, a warning message will appear and the light on the switch will turn off. The system will turn off automatically. RCCW will not operate also if the BCW system turns off due to malfunction. Have your vehicle inspected by an authorized HYUNDAI dealer.
Warning and system control
Limitations of the systemHyundai Elantra AD (2016-2020) Owners Manual: System Setting and Operation
System setting
• Setting Blind-Spot Safety function
The driver can activate the system by placing the ignition switch to the ON position
and by selecting 'User Settings → Driver Assistance → Blind-Spot Safety'.
- The BCW turns on and gets ready to be operated when 'Warning O ...
Hyundai Elantra AD (2016-2020) Service Manual: Brake Line Repair procedures
Removal
1.
Disconnect the negative (-) battery cable.
2.
Disconnect the brake fluid level switch connector.
3.
Remove the brake fluid from the master cylinder reservior with a syringe.
•
Do not spill brake fluid on the vehicle, it may damage the
paint; if br ...