Wiper Switch Testing

Disconnect electrical connector at wiper motor. Using digital voltmeter and voltmeter check for voltage or continuity at designated terminals of electrical connector in accordance with wiper switch position. See Fig 1 .
Check for voltage with ignition on. If switch is okay, remove wiper motor and test. See WIPER MOTOR TESTING in this article.

Fig 1: Testing Wiper Switch

Courtesy of GENERAL MOTORS CORP.