Nissan Sentra B18 (2020-2025) Owner's Manual: I-FCW system limitations

Illustration A

WARNING

Listed below are the system limitations for the Intelligent Forward Collision Warning (I-FCW) system. Failure to operate the Nissan Sentra in accordance with these system limitations could result in serious injury or death.

• The I-FCW system on the Nissan Sentra cannot detect all vehicles under all driving, traffic, or environmental conditions.
• The radar sensor does not detect the following objects:
  • Pedestrians, animals, or stationary obstacles located in the roadway
  • Oncoming vehicles approaching from the opposite direction
  • Vehicles crossing the path of travel
• (Illustration A) The I-FCW system does not function correctly when the vehicle ahead is a narrow vehicle, such as a motorcycle or similar profile.
• The radar sensor may not detect a vehicle ahead under the following conditions:
  • Snowfall or heavy rain that interferes with radar signal transmission
  • Dirt, ice, snow, or other materials covering the radar sensor area
  • Interference from other nearby radar sources
  • Snow or road spray generated by surrounding vehicles
  • Driving through tunnels or enclosed road structures
  • (Illustration B) When the vehicle ahead is being towed
  • (Illustration C) When the following distance is extremely short, causing the radar beam to be obstructed
  • (Illustration D) When driving on steep downhill slopes or roads with sharp curves
• The system is designed to automatically monitor sensor functionality within defined limits. However, it may not detect certain obstructions such as ice, snow, or stickers placed over the sensor area. In such cases, the Nissan Sentra I-FCW system may not provide proper warnings. Always inspect, clean, and clear the sensor area regularly.
• Excessive external or interior noise may interfere with the warning chime, reducing the likelihood that the alert will be heard by the driver.

Illustration B

Illustration C

Illustration D

System temporarily unavailable

Condition A

When the radar sensor detects interference from another radar source and is unable to reliably identify a vehicle ahead, the I-FCW system on the Nissan Sentra will be automatically turned off.

The AEB with Pedestrian Detection system warning light (orange) will illuminate to notify the driver.

Action to take:

Once the above conditions no longer exist, the I-FCW system will resume normal operation automatically without driver intervention.

Condition B

When inclement weather conditions such as rain, fog, or snow obstruct the front radar sensor, the I-FCW system will be automatically canceled. An audible chime will sound, and the warning message “Forward Driving Aids Temporarily Disabled – Front Sensor Blocked: See Owner’s Manual” or “Driving Aids Temporarily Disabled – Front Sensor Blocked: See Manual” will appear in the vehicle information display.

For vehicles with the 4.2 inch meter display

Action to take:

When the listed conditions are no longer present, the warning message will disappear from the vehicle information display. If the warning message continues to appear, have the Nissan Sentra I-FCW system inspected. It is recommended that you visit a NISSAN dealer for service.

Condition C

When the radar sensor on the front bumper is covered by mud, dirt, snow, ice, or otherwise obstructed, the I-FCW system will automatically be canceled. A chime will sound and the corresponding front sensor blocked warning message will be displayed.

Action to take:

If the warning message appears, stop the vehicle in a safe location, shift to the P (Park) position, and turn the engine off. Clean the radar sensor area on the front bumper, then restart the engine. If the warning message remains displayed, have the system checked by a NISSAN dealer.

Condition D

When driving the Nissan Sentra on roads with limited surrounding structures or minimal visual references—such as long bridges, desert areas, snowfields, or when traveling alongside extended walls—the front radar sensor may receive insufficient or distorted reflections. In these situations, the system may illuminate the warning light and display the message “Forward Driving Aids Temporarily Disabled Front Sensor Blocked: See Owner’s Manual” or “Driving Aids Temporarily Disabled Front Sensor Blocked: See Manual” in the vehicle information display.

Action to take:

Once the above driving conditions no longer exist and normal road environments are restored, turn the driver assistance system back on to resume standard operation of the Nissan Sentra safety features.

NOTE:

If the AEB with Pedestrian Detection system stops working, the Intelligent Forward Collision Warning (I-FCW) system on the Nissan Sentra will also stop functioning, as both systems operate in an integrated manner.

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