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Object Detection Description and Operation (with Rear Cross Traffic Alert, UFT, Except N America): Notes

WARNING: This page is about a different car, the 2015 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Rear Cross Traffic Alert Block Diagram (with Rear Cross Traffic Alert, UFT, Except N America)
GM3443733Courtesy of GENERAL MOTORS COMPANY
Callout Component Name
B218R B218R Side Object Sensor Module - Right
B218L B218L Side Object Sensor Module - Left
A11 A11 Radio
K40 K40 Seat Memory Control Module
P45LR Seat Haptic Movement Motor - Driver Left Rear
P45RR Seat Haptic Movement Motor - Driver Right Rear

The rear cross traffic alert system is a feature that utilized two side object sensor modules to provide enhanced customer convenience while backing up by sensing and providing warnings to the driver on impending rear cross traffic. The rear cross traffic alert system is designed to detect and track moving objects as small as a 125cc motorcycle with rider within a specified coverage zone behind the vehicle. The system is designed to alert the driver, with a visual display and either an audible sound or a haptic warning, if equipped and enabled, to the presence of moving objects of interest that may cause a collision with the host vehicle. Although the system is intended to assist drivers in backing up, it does not replace driver's vision. The driver is responsible to check carefully for objects outside of the coverage zone (e.g., a fast approaching vehicle) for a safe backing maneuver.