How do i perform the 2004 Lexus GX470 air suspension reset?

The first thing You can try to reset the air suspension on Your 2004 Lexus GX470 is to disconnect the fuse to the air suspension system, which is located in the engine compartment. This sometimes is all You need to do to reset the system. If that doesn't work, and You want to try another method, You can locate the DLC1 test connector, under the hood on the driver's side, and try putting a jumper to connect terminals TS and E1, then push the DOWN button Your height select switch 5 times or more within 5 seconds after starting the engine. If this works, You should see the height control light start flashing at a 25 second interval, and can proceed to use Your suspension system.