Windshield wiper control unit and windshield wiper control method

A windshield wiper control unit that controls an operation of a windshield wiper based on a position of an operation member, comprising:

• an electric value detection unit that detects an electric value that continuously changes based on the position of the operation member;
• a storage unit that stores position determination ranges that are formed by dividing the variation range of the electric value into multiple non-overlapping electric value ranges, and that correspond one-to-one with multiple positions of the operation member;
• a setting unit that sets a reference electric value range that is a portion of a variation range of the electric value;
• a determination unit that determines whether the electric value detected by the electric value detection unit falls within the reference electric value range;
• and
• a position determination unit that determines the position of the operation member based on a relationship between the reference electric value range and the position determination ranges, wherein
• when the determination unit determines that the electric value detected by the electric value detection unit continuously falls outside the reference electric value range for at least a predetermined time period, the setting unit updates the reference electric value range in such a manner that the electric value, which falls outside the pre-update reference electric value range, falls within the post-update reference electric value range.