2021-2024 Nissan AEB Warning Light Blinking TSB

Nissan Technical Service Bulletin (TSB) NTB19-042E addresses customer concerns regarding the Automatic Emergency Braking (AEB) warning light blinking in various 2021-2024 Nissan models. This bulletin provides diagnostic guidance for technicians when the "Automatic Emergency Braking (AEB) warning light" or the "OFF" indicator is blinking, but not illuminated steadily, and no Diagnostic Trouble Codes (DTCs) are stored.

This TSB is an amendment, superseding previous versions including NTB19-042D dated March 9, 2023, and earlier revisions like NTB19-042, NTB19-042a, NTB19-042b, and NTB19-042C. It specifically applies to vehicles equipped with a lane camera, which is a critical component for the AEB system.

Symptoms

Owners may observe the "Automatic Emergency Braking (AEB) warning light is blinking" on their instrument cluster. This blinking is intermittent, not a steady illumination, and typically occurs without any associated fault codes being stored in the vehicle's computer system. The primary concern is the blinking of the AEB warning light, indicating a potential temporary issue with the system's ability to function.

Important Warnings

Nissan emphasizes several critical points for technicians and owners:

• "Do not replace the lane camera." This is a repeated instruction throughout the diagnostic process, underscoring that the blinking light is often not a camera malfunction requiring replacement.
• "Do not immediately replace the lane camera." Technicians are instructed to perform thorough checks and cleaning procedures first.
• If the AEB warning light is illuminated steadily (not blinking), this bulletin does not apply.

Diagnosis Conditions

The "Nissan AEB warning light blinking" typically occurs under specific environmental or operational conditions. These include:

• Contamination or foreign material adhering to the lane camera viewing window on the windshield. This could be anything from dirt, bugs, or debris (as shown in Figure 2, highlighting the area around the lane camera).
• Driving in snowy conditions or when frost forms on the lane camera viewing window.
• When the lane camera viewing window on the windshield is temporarily fogged up.

Other conditions that may cause the AEB warning light to blink or flash, but where the AEB system will resume automatically once conditions clear, include:

• Heavy rain or thick fog.
• Strong light shining directly from over the front of the vehicle.
• Cabin temperature exceeding approximately 104°F (40°C) in direct sunlight.
• The radar sensor picking up interference from another radar source.
• Driving on roads lacking clear structures or buildings, such as long bridges, deserts, snow fields, or next to long walls.

Diagnosis and Repair Procedure Summary

When a customer reports the "Nissan AEB warning light blinking," technicians follow a specific flowchart:

1. Verify Symptom: Confirm if the AEB warning light is currently blinking or if the customer reports it was blinking previously.
2. Check for DTCs: Determine if any Camera/Radar/ADAS-related DTCs are stored. If DTCs are present, technicians are directed to refer to the Electronic Service Manual (ESM) for diagnosis related to the Laser/Radar, ICC/ADAS, or Lane Camera systems. This TSB primarily applies when no DTCs are present.
3. Inspect Windshield: Examine the windshield area in front of the lane camera (Figure 1) for dirt, frost, fog, or damage. If found, the technician should first use wipers, defroster, or a soft cloth to clean the area. For cleaning glass, technicians may refer to TSB NTB13-028, and for damaged glass, TSB NTB17-019.
4. Check Mounting: Verify that both the camera and the lane camera bracket are mounted properly.
5. Verify Resolution: After addressing any identified conditions (cleaning, repairing windshield, correcting mounting), the technician verifies that the AEB warning light has stopped blinking.

This process emphasizes that simple environmental factors or minor obstructions are often the cause of the "Nissan AEB warning light blinking," rather than a component failure.

What Owners Should Know

If you experience the "Nissan AEB warning light blinking," it's important to understand that it often indicates a temporary condition rather than a permanent malfunction. Cleaning your windshield, especially the area in front of the lane camera, can often resolve the issue. The AEB system is designed to detect these temporary obstructions and will automatically resume normal operation once the conditions that caused the blinking are no longer present. If the light continues to blink after cleaning your windshield, or if it illuminates steadily, it's best to have your vehicle inspected by a Nissan dealer.