Wiper Switch: Testing and Inspection

Multi Function Lever Test:

Wiper Washer Switch Voltage Chart:

PROCEDURE
Disconnect wiring harnesses from wiper motor and perform the following multi-function lever tests using a digital voltmeter with ignition switch on. All voltage readings taken with respect to vehicle ground. Probe terminals 1 through 4 with digital voltmeter and multi-function lever in various positions.

If the Multi-Function Lever Test is not completed correctly, then the multi-Function lever is defective. However, it is possible that the wiring harness is defective and has an open or short.