2021-2022 Nissan AEB Warning Light Blinking TSB

Nissan Technical Service Bulletin (TSB) NTB19-042C addresses a common concern for owners of various 2021-2022 Nissan models: the Automatic Emergency Braking (AEB) warning light blinking. This bulletin clarifies that a blinking AEB warning light, when not steadily illuminated and without any associated Diagnostic Trouble Codes (DTCs), typically indicates a temporary condition affecting the lane camera's view, rather than a system fault.

This TSB has been revised multiple times, with the latest version, NTB19-042C, issued on January 26, 2022. It supersedes previous versions NTB19-042, NTB19-042a, and NTB19-042b.

Symptoms

Owners may observe the AEB warning light blinking on their instrument cluster. This blinking is intermittent and does not involve a steady illumination of the light. The key characteristic is the absence of any related DTCs in systems such as Laser/Radar, ICC/ADAS, or the Lane Camera itself.

Important Warnings

Nissan emphasizes several critical points for technicians and owners regarding the Nissan AEB warning light blinking:

• Do not replace the lane camera: This bulletin explicitly states that technicians should "Do not replace the lane camera" if the AEB warning light is blinking under the described conditions. Replacing the camera will not resolve the issue.
• No DTCs: If any DTCs are present in the Laser/Radar, ICC/ADAS, or Lane Camera systems, this bulletin does not apply. In such cases, technicians should refer to the Electronic Service Manual (ESM) for proper diagnosis.

Diagnosis and Trigger Conditions

The blinking AEB warning light is often triggered by environmental factors or obstructions to the lane camera's viewing window on the windshield. These conditions include:

• Contamination or foreign material adhering to the lane camera viewing window.
• Driving in snowing conditions or when frost forms on the viewing window.
• The lane camera viewing window being temporarily fogged up.
• Heavy rain or thick fog.

Additionally, the AEB warning light may blink or flash temporarily under certain environmental conditions, but the system will automatically resume normal operation once these conditions subside. These include:

• Strong light shining directly over the front of the vehicle.
• Cabin temperature exceeding approximately 104°F (40°C) in direct sunlight.
• Interference with the radar sensor from another radar source.
• Driving on roads lacking structures or buildings, such as long bridges, deserts, snow fields, or when driving next to long walls.

Repair Procedure Summary

For a blinking AEB warning light without DTCs, the primary focus is on ensuring a clear view for the lane camera. Technicians are instructed to:

1. Inspect and Clean: First, use wipers, defroster, and/or a soft cloth to clean the area around the lane camera viewing window on the windshield. Figure 1 and Figure 2 in the TSB illustrate the lane camera and the area that needs to be kept clean.
2. Windshield Condition: Clear, clean, or repair the windshield as needed. This may involve referring to other bulletins like NTB13-028 for cleaning glass or NTB17-019 for damaged glass.
3. Mounting Check: Verify that both the camera and the lane camera bracket are mounted properly. If not, correct the improper mounting according to the Electronic Service Manual (ESM).
4. Verification: After addressing these points, verify that the AEB warning light has stopped blinking.

What Owners Should Know

It's important for owners to understand the distinction between the AEB system detecting an obstruction (which causes the blinking light) and an actual system malfunction. A blinking Nissan AEB warning light often means the system's view is temporarily impaired, and it's trying to inform you of this limitation. Cleaning your windshield, especially the area in front of the lane camera, can often resolve this issue. If the light blinks persistently or if you experience any other warning lights or drivability concerns, it is advisable to consult a Nissan dealer.

NHTSA ID: 10207869