Rxv667

I have a Premier model which has 18” wheels. I bought a set of 17” rims and to me it’s improved the ride 50%. It might be different for others but for me it’s made a huge improvement.  
 

Whilst researching the problem I had, I never came across a similar issue on the 3rd Gen IS. However it was pretty common on older GS and LS and RX models. 
 

Just thought I would update for anyone else having the same issues. 
 

Problem was

no interior panel/switch lights

no rear side lights

no number plate lights

no fog lights front or rear

evetything else working as normal. 
 

Checked all fuses, all ok. 
Techstream scan no DTC

Did a diagnosis with Techstream. Relay working fine for the rear side lights and the lights would work when testing with Techstream. 
Result was Techstream stated replace main body ecu. Found a used one on eBay for £40. 
 

Main body ecu is located behind the fuse box which sits under the passenger footwell.

Tips

I disconnected the negative Battery terminal.

I did not disconnect the passenger side leg airbag. It has to be removed but you can move it to the side without disconnecting it.  
 

I did not remove the entire fuse box and wires connected to it like it shows in the service manual. If you undo the two 10mm nuts holding the fuse box in place you can wiggle the fuse box enough to get to the main body ecu. 
 

Took about 30 minutes to replace and put everything back together. 
 

Problem solved. Everything works again.
 

The key fob stopped operating the locks wirelessly after replacing the main body ecu. I think it was to do with the initialisation of the gateway ecu and main body ecu ( I didn’t know what I was doing so was trying loads of stuff to get the key fob to work) which I did using Techstream or I cleared the DTC’s. I don’t know which but the fob works again. 

What caused the issue?

The only thing I did was replace the interior bulbs 6 of them in the overhead lights to some LED ones. This was two weeks before I had the problem but the LED bulbs were still working fine. Coincidence or not I don’t know but I have removed all the LED bulbs and put the standard ones back in  

Hope this helps anyone with a similar issue. 
 

I used Techstream. No fault codes found. 
 

Done an active test on the relay and the headlight switch as per the trouble shooting in the repair manual. Both parts working fine. Rear lights come on in the testing. 
 

Repair manual states if not the above then it will be the main body ecu. 

8 hours ago, royoftherovers said:

DRL`s do not operate at rear of vehicles normally.

Switch lights from AUTO and then check again.

Just checked. No lights at rear

Hi

i just looked at them in the light. 
 

I can do a continuity check tomorrow. 
 

Someone just told me the rear sidelights are not working either. 
 

Brake lights, reverse light works. Fuse again looked fine but will do a proper check tomorrow. 

Hi Guys

I have a problem with the illumination of the climate control, gearbox selection lights, window buttons, basically all the lights that are meant to illuminate on the centre console to be able to see them at night dont work. I only noticed this yesterday. The actual buttons work on the climate and windows etc, just cant see them at night anymore.

I have checked the fuses and they all seem fine. The fuse i checked was under the passener footwell, a 7.5a fuse that was labeled "panel" 

Any pointers at what the issue could be?

Hi,

To be honest i have been looking at 17" alloys for a bit more comort. I came across some adjustable arms for the rear, i think i read this on some American forum. Did not look into it any further.......will when i get a chance.

Please do keep us updated with how you get on with the GS-F bushings.

Hi Guys

I have a 2014 Lexus IS300H Premier with 24,000 miles on the clock. It has the standard 18 inch alloys with different tyre sizes for the rear and front.

I had a 4 wheel hunter laser alignment done 12 months ago by a local place not because of tyre wear or anything else, i do this when i purchase a car.

Anyway i went for a MOT yesterday and all 4 tyres are wearing out unevenly. The rears are wearing out on the inner edges and the fronts are wearing out on the outer edges. The tyre pressue is checked by me every few weeks.

I have done many searches and apparently its an issue with the way Lexus has designed the suspension. The bushes were all fine on the MOT.

What bushes do i need to replace to fix this issue and what do i tell the tyre alignment guys in what settings to use for the camber/toe or whatever it is?

Secondly i now have to replace all 4 tyres but can i use the same tyres for all 4 wheels rather than have 2 different sizes front and rear? If i can use the same tyre size what size do you reccomend, i dont mind a bit more comfort, i only use my car for work which is a 4 mile journey in town, im not fussed about handling or looks, i would rather have more comfort. I dont drive fast or in anger,i normally pootle about at 30mph. I would prefer a larger profile for more comfort.