A frontal passenger airbag module is provided in association with the forward part of the instrument panel adjacent the windshield. The drive section drives the piezoelectric body by setting a voltage of one of the electrodes to a first low voltage having a relatively small absolute value, and by supplying a drive signal of one polarity to the other electrode. Various rules can be executed to delay, inhibit, andor enable an action such as sending notifications according to the preferences and current user states as determined from the context.