Object Detection Description and Operation (Lane Departure Warning): Notes

WARNING: This page is about a different car, the 2009 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.

Vehicle direction alert alarm warning (VDAAW) is a convenience feature that issues a warning when the system detects that the vehicle has unintentionally crossed a lane marking. The VDAAW lane sense function utilizes imagery collected by the camera to detect lane markings. An audible warning provided by the audio system is issued when then VDAAW system detects an unintentional lane departure. The VDAAW receives vehicle speed, steering wheel angle and brake pedal position information via the serial data circuit. The VDAAW system consists of two main components:

The VDAAW module which includes the camera
VDAAW enable/disable (ON/OFF) switch

The VDAAW enable/disable switch is a soft key located in the navigation radio system. The VDAAW module receives the VDAAW switch inputs from the navigation radio via serial data circuit. The VDAAW system remembers the last switch state (ON or OFF) and returns to the last switch state in the next ignition cycle.

The VDAAW module is mounted on the front windshield and uses a forward facing camera to determine lane markings. It is important that the windshield in front of the camera remain clean. Fog on the windshield or the camera lens may inhibit proper operation.

The VDAAW system has four operating states:

OFF: The VDAAW system is turned OFF and the ignition is OFF.
Disabled: The system is disabled by the operator from the VDAAW disable switch.
Not Ready To Assist (NRTA): The system is enabled, but unable and not ready to detect lane crossings for any of the following reasons.

Vehicle speed is less than 35 mph. The VDAAW system is designed to function at speeds greater than 35 mph.
The VDAAW system cannot detect lane markings. This may be because there are no lane markings (as in a country road) or that the lane markings cannot be determined because of snow or other elements that may affect driving conditions.
The windshield or camera lens may be blocked by fog or other elements and the system cannot detect lane markings

Ready To Assist (RTA): The system is enabled and ready to warn of unintentional lane crossings. The VDAAW ready to assist state is indicated by a green indicator in the instrument panel cluster.