The rear cross traffic alert functions when your vehicle is in reverse.
It can detect other vehicles approaching from the right or left rear of the vehicle. It uses radar sensors to alert the driver of the other vehicle’s existence through flashing the outside rear view mirror indicators and sounding a buzzer.

Caution
Cautions regarding the use of the system
The driver is solely responsible for safe driving. Always drive safely, taking care to observe your surroundings.
The rear cross traffic alert function is only an assist and is not a replacement for careful driving. The driver must be careful when backing up, even when using the rear cross traffic alert function. The driver’s own visual confirmation of behind you and your vehicle is necessary and be sure there are no pedestrians, other vehicles, etc. Before backing up. Failure to do so could cause death or serious injury.
According to conditions, the system may not function correctly. Therefore the driver’s own visual confirmation of safety is necessary.
The rear cross traffic
alert function
The rear cross traffic alert function detection areasInitialization
Initialize sliding roof drive gear subassembly
Notice:
When replacing the sliding roof drive gear, the
sliding roof drive gear requires initialization. If a
reset is not executed, the following functions do not
operate: auto operation and key off operation.
Turn the ignition switch on. ...
Precaution
Inspection procedure for vehicle involved
in accident
Perform the zero point calibration and sensitivity
check if any of the following conditions apply.
The occupant classification ecu is replaced.
Accessories (seat cover etc.) Are installed.
The front passenger seat is remove ...
Diagnostic trouble code chart
Hint:
If any dtcs are displayed during the dtc check, inspect the
circuit listed for these dtcs. For details of each dtc, refer to
the page indicated in the dtc chart.
Hint:
: Warning
light comes on
X: warning light turns off (normal reset) ...