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Message: <blockquote data-quote="Mike10" data-source="post: 62299" data-attributes="member: 5461">The oil pressure light is on a time delay and will not come on by just turning the key switch on.  I do not know exactly what the eic is looking for before the oil light comes on but I know just turning the key on will not do it.As long as you have an early LS160 service manual the diagnostics and setup are the same.  The last LS160's used a different panel but I do not think the later one is shown in the service manual.The wiring diagrams should also be the same.The wiring diagram is where you need to start.  Remove the headliner and right side panel by the service run switch and check if the wiring to the service/run switch is correct. You have not said if the eic lights come on when you sit in the seat with the KEY OFF and the service\run switch in the RUN position.To check if the seat switch and seat belt switch are operating you can unplug the seat harness at the back of the seat.  You will find three terminals in the connector.  With someone in the seat with the seat belt fastened you should have continuity between all three termanals of the seat harness.Check the  machine end of the connector you disconnected from the seat harness, and you should have power to one terminal at all times reguardless of operator present or key switch position.Start with that and let us know what you find, then we will go to step 2.</blockquote>