See /etc/rc.d/rc.M:
Code:
# Start crond (Dillon's crond):
# If you want cron to actually log activity to /var/log/cron, then change
# -l notice to -l info to increase the logging level.
if [ -x /usr/sbin/crond ]; then
/usr/sbin/crond -l notice
fi
Hrm, edit: actually, the text is different in 13.0, but you'll see the appropriate change to make.