2021-2023 Nissan AEB Warning Light Blinking TSB NTB19-042D

Nissan has released Technical Service Bulletin (TSB) NTB19-042D to address instances where the Automatic Emergency Braking (AEB) warning light is blinking. This condition is typically observed when the light is blinking but not illuminated steadily, and no related Diagnostic Trouble Codes (DTCs) are stored in the vehicle's system. This bulletin applies to a wide range of 2021-2023 Nissan vehicles equipped with a lane camera.

Symptoms

Owners of affected Nissan vehicles may observe the "AUTOMATIC EMERGENCY BRAKING WARNING LIGHT BLINKING" on their instrument cluster. The bulletin specifically notes that the "AEB warning light or OFF is blinking" without being continuously illuminated. This blinking light indicates a temporary condition affecting the AEB system's ability to function optimally.

Diagnosis / Trigger Conditions

The TSB NTB19-042D identifies several common conditions that can cause the 2023 Nissan Sentra AEB warning light blinking, and other Nissan models, without indicating a fault in the system itself:

• Windshield Obstruction: Contamination, foreign material, snow, frost, or temporary fogging on the lane camera's viewing window on the windshield can impede its vision.
• Environmental Factors: Heavy rain, thick fog, or driving in snowing conditions can also trigger the blinking light.
• Light Conditions: Strong sunlight shining directly over the front of the vehicle can affect sensor performance.
• Radar Interference: The radar sensor may pick up interference from other radar sources.
• Driving Environment: Driving on roads lacking structures or buildings, such as long bridges, deserts, or snow fields, can sometimes cause the system to react.
• Cabin Temperature: Extremely high cabin temperatures, approximately 104°F (40°C) or higher, due to direct sunlight.

If DTCs are present in related systems such as Laser/Radar, ICC/ADAS, or the Lane Camera, technicians are advised to refer to the Electronic Service Manual (ESM) for specific diagnostic procedures.

Important Warnings

Nissan explicitly states in TSB NTB19-042D that technicians do not immediately replace the lane camera if the AEB warning light is blinking due to the conditions described. Replacing the camera will not resolve the issue if the root cause is environmental or an obstructed windshield. Similarly, the bulletin advises against replacing the lane camera if the windshield is dirty, frosted, fogged up, or damaged in front of the camera.

Repair Procedure Summary

The primary repair for the 2023 Nissan Sentra AEB warning light blinking, and other Nissan models, involves addressing the conditions affecting the lane camera's view. Technicians should:

1. Inspect and Clean Windshield: Check the lane camera viewing window on the windshield for contamination, foreign material, snow, frost, or fog. Use wipers, defroster, and/or a soft cloth to clean the area. For general glass cleaning, refer to TSB NTB13-028. If the windshield is damaged, refer to TSB NTB17-019 for guidance.
2. Verify Camera Mounting: Ensure both the camera and lane camera bracket are mounted properly. If not, correct the improper mounting according to the ESM.
3. Verify Resolution: After addressing the conditions, verify that the AEB warning light has stopped blinking.

Nissan emphasizes explaining to the customer the difference between contamination detection (which causes the blinking) and an actual system malfunction. The AEB system is designed to resume automatically once these temporary conditions no longer exist.

Owner Action

If your 2021-2023 Nissan vehicle is experiencing the "AUTOMATIC EMERGENCY BRAKING WARNING LIGHT BLINKING," first ensure the area of your windshield in front of the lane camera is clean and clear of obstructions. If the issue persists after cleaning, or if you are unsure, it is recommended to visit an authorized Nissan dealer. They can perform a proper diagnosis using TSB NTB19-042D to determine the exact cause and perform any necessary cleaning or adjustments.

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Source: NHTSA ID: 10234002