RX350, AWD


Asked by Jan 31, 2016 at 09:33 PM about the 2015 Lexus RX 350 AWD

Question type: General

My manual says that pressing LOCK sends torque to all
wheels and helps to get out of snow, retc. After 25mph or
pressing the brake pedal, the transmission switches back
to AWD but mostly forward drive.

Is RX350 on the road a FWD and engages rear for traction

I'd like to understand details of how Lexus models
transmit powers to wheels.


3 Answers


It is all computer controlled, using the wheel speed sensors the computer senses what wheels has the best traction and sends power to those wheels, when all the wheels have equal traction then it is sending power evenly to all the wheels thus you get the all wheel drive setup, it is very closely monitored by the computer and is so smooth that you don't feel the power transfers at all, you might even think that it is not working. There is a video on AWD vehicles on you tube it is more of a general rendition but it can give you a better understanding of how it works. I would buy another RX if my wife promised she would not wreck it, like that is going to happen with all the crazy drivers that seem to be even showing up out here. HTH

1 out of 1 people think this is helpful.

Thank you. However, I don't think that's entirely accurate. Computer does not send the power to all wheels when there is even traction. It actually switches the car to front WD. That's what I was wondering about. Are they saving fuel or something?


There is always power going to the rear drive shaft otherwise it would mess up the fluid clutches inside the transfer case that is how it senses traction by sending little bits of power and then reading the sensor readings that are taken up to 60 times a second while driving down the road so it is never fully in front wheel drive. That is why all of the tires must be the same diameter, if one tire is smaller or larger than the others it can tear things up really fast not to mention how it drives.

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