Follow the steering column down to the floor, there you'll see a u-joint fitting with rubber bushings. Spray there with WD-40 and the squeak will go away.
i know my Lexus turns off sometimes when i drive cuz my battery terminals r loose so it shuts off the car
Answer: If its a high-pitched squeak, it sounds like the wear sensor on the inner brake lining.
check tensioner pulley and idler pulley if equipped.
That usually means they are becoming flat. Also it could be something on your tire. Take it in and have it looked at.
The brakes :)
If it happens while turning it could be your CV joint. I would check the boot to see if it is ripped or leaking grease.
Low on steering pump fluid or a lose belt
You probably need a Lube job. This should be done on alternate oil changes as a routine measure.
Check your power steering fluid or your fan belt could be making noise.
This could be a number of things. If the sqeeking happens when braking, then you probably need brakes. If it happens while driving, accelerating and turning then it could be the belt that is making noise. This can be due to a loose belt, worn tensioner or power steering fluid low or power steering issue.
On the open road or freeway with mild inclines.
if its not turning on then its broken.