Nissan X-Trail e-POWER 2023 Owners Manual
8.25.1. RAB system operation
When the shift lever is in the R (Reverse) position and the vehicle speed is between approximately 3 km/h (2 MPH) and 15 km/h (9 MPH), the RAB system operates.
If a risk of a collision with an obstacle is detected when your vehicle is reversing, the RAB system warning indicator will flash in the vehicle information display, a red frame will appear in the centre display (models with the Intelligent Around View Monitor system), and the system will chime three times. The system will then automatically apply the brakes. After the automatic brake application, the driver must depress the brake pedal to maintain brake pressure.
The brake lights of the vehicle come on when braking is performed by the RAB system.
When the brakes operate, a noise may be heard. This is not a malfunction.