Hi everybody, my car is due for a transmission fluid change and I cannot find the filler plug. I looked everywhere except on the top of the transmission which is impossible from underneath the car. The Lexus Techdoc suggests to disconnect a small rubber hose about one foot from the gearbox on the fluid line to the oil cooler and fill the transmission from there.
There has to be a fluid filler plug because without that, the fluid level cannot be adjusted if its temperature is not within the 30 C to 40 C range. A special tools is connected to the filler plug to to add fluid or apply vacuum so no fluid drains from the pan when the drain plug is removed in order to connect to it another special tool which compensates for the fluid level at higher temperatures.