Can anyone tell me if there is a way to test the wiper motor and/or multi function switch on a 2003 Suburban? Thanks.

 

Quick test procedure:

turn switch on.

works = good
doesn't work = bad

End of test.

 

Nice, horrible reply. Say it's a wiring issue between the switch and the motor? Then what?

OP: I'd get a voltmeter and make sure an electric current is getting to the wires just before the motor. If so, then it is most likely the motor.