Back in the ‘90’s I used to deliver cars for Eurodollar rent-a-car and the new Ford Sierra/Shapphire at the time had an inertial switch that was fixed in the spare wheel well that in the event of a severe rear end collision would cut the supply to the fuel relay. This was fine until you had a puncture and used the spare ( full size alloy) wheel and then chucked in the flat tyre/wheel that you have just removed back in the wheel well and knocked the sensor into cutting the fuel supply off!!! Numerous times the AA would be called to a punter who had a crank/no start after sorting a puncture themselves to simply push the reset button in the middle of this solenoid in the wheel well to get the car on its way!
Well if you can post on a forum, I guess you can use Google and put in ‘Lexus’ ‘IS250’ ‘Manual’ and you will get something like this,
https://d24bc9lyrt5en5.cloudfront.net/Customer-Portal-Admin/emanuals/LEXUS/OM53A88E.pdf