Wiper Inoperative In Delay Mode But Operates Correctly In "Lo", "Med", Or "Hi"

With ignition "ON" and dash switch in mid-delay position, remove connector from No. 6 and 7 terminals and connect a voltmeter between No. 7 connector terminal and ground. A 12 volt reading indicates timing device needs replacing. With a zero reading, check battery circuit to dash switch, check dash switch, or check for an open circuit between dash switch and wiper.