Repetition Blocking

To protect the door latch actuators the BCU incorporates a repetition blocking feature. The BCU increments an internal counter by one each time an actuation occurs and decrements the counter by one every 8 seconds. If the counter exceeds 15, the BCU blocks further unlocking commands until the counter returns to 15 or less. The block is ignored if the BCU receives a crash signal or the system goes from superlocked to locked. In addition to the counter for the side doors, separate counters are maintained for each of the tail doors.