Answer Hello Rick, The way that you would test the lid switch on this unit is to check continuity between L1 (line) and SW (machine). You should have contact between these 2 points whether the lid is open or closed. You also check between L1 and M (motor). With lid open you should not have continuity and with lid closed you would have continuity. You can test this with a multi-meter TJMA-DMT3. Here is a link on how to use a multi-meter. http://forum.appliancepartspros.com/oven-repair-including-ranges-cooktops/4810-how-check-continuity-ohmmeter.html Read More... Answered by AppliancePartsPros.com | Thursday, November 8, 2012