Mythreecar

I'm looking for the location of the power steering module on my GS2013

primavera

IS cars have them under the car battery. You need to remove the battery and then the tray underneath it to get to it. I’m assuming it’s in the same spot in GS models.

repugnante

May I ask the reason why you're looking for it?

Mythreecar

Looking to send out to G7 Computer for repair in hopes it is the source of my "notchy steering"

primavera

The car has electric steering, it's possible that if the steering hasn't been calibrated properly, that wandering may occur at speed.
The calibration could have been undone by some type of steering related repair, or maybe an alignment was done and the steering not calibrated after.
A simple calibration called "zero point calibration" performed using the Toyota/Lexus Techstream scan tool will address any calibration issues.

https://www.clublexus.com/forums/ls-...echstream.html

Mythreecar

Thanks for the reply. Can any alignment shop check the calibration?

Mythreecar

Still looking for the EPS location in 2013 GS if I want to send out to G7 Computer for a possible rebuild. They charge $275 and do not charge if they find nothing wrong. I have described the intermittent problem at speed and they claim they can check for that.
I've been dealing with this issue for years and have gotten nowhere with the dealer. I just don't take the car on road trips.

primavera

The alignment shop may not have the Techstream. I would find a Toyota/Lexus mechanic in your area and take the car to have steering re-calibrated. You could also look for someone locally that has a Techstream on laptop and do it yourself.

Mythreecar

Over the years Lexus has convinced me twice that the problem is caused by alignment, and they aligned the car at 44K and again at 59K with no effect on the notchy steering. So I doubt it is a calibration issue, but I will look into having it checked.
Thanks, as this is something I did not think of.

primavera

The zero point calibration needs to be done after alignment procedure, it even states in the service manual. It only takes 10-15 min to perform and should be done without extra charge, it's not optional.

Mythreecar

So it probably was done on both occasions and the notchy steering persists. My current thought is that on a long high speed drive the EPS heats up or something else happens to it and the notchy steering occurs. It's the comment complaint that after coming out of a slight curve on the interstate the wheel sticks and doesn't return to center without a tug. I find that once this is occurring that if I stop for a meal or fuel [say 20 minutes] and get back on the road it takes some time before the NS returns.

JDR76

I'm thankful to not have experienced this in any of my GSs. I hope I never do and I hope Lexus addresses the issue for you guys.

primavera

I wouldn’t bet on it. Techies don’t bother doing the steering calibration unless the customer insists on it. They will often convince client that calibration is not needed after alignment, even though the service manual clearly states it is a part of alignment.

peasodos

iTrader: (1)

2013 GSh 107k miles no steering issues. IDK why that gets screwed up for some of you. Maybe specific series of replicable events caused the problem. I've had my car alighened once since my ownership at 64k miles, after a new set of tires.