Where does the hole at the base of the wiper lead to?

[AveryLynn]

The hole at the base of the wiper leads to the exterior of the car. Here is an introduction about the wiper: 1. Introduction: The wiper is an important accessory installed on the windshield, and its function is to remove rain, snow, and dust that obstruct the view on the windshield glass. 2. Working principle: The motor on the electric wiper drives the output shaft through the worm gear on the armature shaft and drives the output gear through the idler gear and idler shaft. The output arm connected to the wiper linkage is then operated by the output shaft. When the motor rotates, the output arm and linkage are driven to move back and forth. The resistor on the control switch is connected to the motor's armature winding to control the motor's speed. The driver can turn the switch as needed to allow current to flow into the motor's input circuit.