1.This buzzer is used in many places, such as steering, safety door alarm, door open without handbrake, etc. So please make sure the buzzer is not occupied before testing.2. If it is not occupied and the program is running, Please test whether the wire number is ‘BU’ is electrified .(Please note: the wire only has electricity 5 seconds after the switch is pressed and the wire is next to the defroster) Indicator stalksPlease see the attached waybill. We have only one in stock, I shipped it by DHL on September 30th.The others we have to wait the supplier to produce. It may arrive our factory in the end of this month. Please contact me if any questions.