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First check for voltage at the motor with the switch depressed. If there is voltage, then the motor or the motor ground is likely bad. If no voltage it could be a fuse or a bad switch. Try following the wire back from the washer. If it disappears somewhere use the wire color code to help deduce where it leads. If you think you have found what relay it leads to use an ohm meter to check the continuity back to the motor. If the continuity is good on this part of the circuit, then maybe the problem is a fuse or supply voltage, or the switch side of the relay circuit. Also don't forget to check the ground on the motor side.
Be cautious, as I don't think it is worth tearing apart the wiring harness if this is your only problem.
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