2014 Honda Accord forward collision avoidance problems

The forward collision warning system has not worked during the time I have owned the vehicle. I have attempted on several occasions to simulate a condition in which the fcw should alert, with no success. I have taken the vehicle to the selling dealer four times. On two of the visits the fcw only worked once after testing four or more times.the fcw notification was too close for safely taking action. There was no change in the warning distance when changing the settings- long, normal, short.

Constant error warning 'fcw system failed' pops up while driving, many dash error lights turn on, and all ABS and vsa systems are deactivated. System usually resets when car restarted but the error happens again within a few minutes of driving. Took car to dealer, who diagnosed it as vsa modulator unit is defective and needs to be replaced.