A portable device such as a key fob includes a piezoelectric component, such as a vibrator or buzzer, and an accelerometer. Self-testing of the piezoelectric component in the portable device may be achieved by applying a test electrical signal to the piezoelectric component and determining whether a vibration is detected by the accelerometer. If a vibration is detected by the accelerometer, then a determination is made as to whether the vibration detected by the accelerometer matches the test electric signal applied to the piezoelectric component.