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-   -   TPMS dashboard light on, tire pressure is fine...??? (http://legacygt.com/forums/showthread.php?t=197689)

pfoyle 12-08-2012 09:30 AM

TPMS dashboard light on, tire pressure is fine...???
 
OEM size for 2010 LGT tires is 225/45/18... in order to get the Blizzaks I wanted for my winter setup, I had to go with 215/45/18 rubber (on OEM rims). I just installed them on the car this week (Tuesday) and filled them to 35psi (front) and 34psi (rear). Last night my low tire dashboard warning light started blinking, and then stayed on fully. Checked pressure in all 4 tires and it is still good at 35/34... and visually all looks fine as well. Light is still on today...

I suppose the base of my question is: can running this slightly narrower tire cause the TPMS to think the pressure is low? I don't really understand why this would be the case, but other than a malfunctioning sensor, I don't have any other possible explanation...

Any thoughts/ideas? Thanks for any help or advice you can provide!

Drift Motion 12-08-2012 02:36 PM

sounds like sensors are damaged or not communicating

pump the air pressure up to 40 and see if it goes off?
some cars needs some starting cycle/miles driven before it'll go off

09obpleg 12-08-2012 10:58 PM

does it blink every time you start the vehicle, if so then i would look into a sensor being damaged or not communicating like drift said,

doccrowley 12-08-2012 11:04 PM

Bump the pressure at least 3 pounds above what is recommended on the door sticker, at least.

My wife's 09 does the same thing if it is 2 lbs lower than the TPMS thinks it should be. Discount Tire even used their tpms tester to make sure they didn't need to be recalibrated. Her light will come on if the tire is 1lb below ideal. Running 3-4psi above what the door sticker says and the light will stay off for months at a time now. Just put air in her tires last night now that snow is here again.

good luck

nstg8r 12-09-2012 08:18 AM

http://www.tpmsmadesimple.com/faq.php

pfoyle 12-09-2012 08:31 AM

Thanks for the help fellas... I'll try bumping up to 38/37 psi and see if that helps... the light does blink everytime I turn the car on, and then goes solid after a minute or two. This may be a stupid question, but does the TPMS come on the rims/tires, or is it something that is taken out and transferred if you have new tires/rims mounted? That is, when I bought my summer set of rims, I took the tires off my OEM rims and had them swapped onto new rims. Then I bought winter tires and had them mounted on my OEM rims. Just recently I took off the summer rims/tires and replaced them (myself) with the oem/winter setup... If I had done this at a tire shop, would they have taken the TPMS off of the summer setup and reinstalled it onto winter setup, or is this something that is built in to each tire/rim set? I guess what I'm asking is do both sets of rims/tires have the TPMS built in, or is it something that would/should be transferred when I swap setups? Thanks again for all the help!

nstg8r 12-09-2012 08:58 AM

1 Attachment(s)
Quote:

Originally Posted by pfoyle (Post 4193291)
This may be a stupid question, but does the TPMS come on the rims/tires, or is it something that is taken out and transferred if you have new tires/rims mounted? That is, when I bought my summer set of rims, I took the tires off my OEM rims and had them swapped onto new rims.

This is what they look like:

Attachment 136165

So yes, the tire shop obviously transferred them when you changed rims because you never had the warning light go off.

Quote:

Originally Posted by pfoyle (Post 4193291)
Just recently I took off the summer rims/tires and replaced them (myself) with the oem/winter setup... If I had done this at a tire shop, would they have taken the TPMS off of the summer setup and reinstalled it onto winter setup, or is this something that is built in to each tire/rim set? I guess what I'm asking is do both sets of rims/tires have the TPMS built in, or is it something that would/should be transferred when I swap setups? Thanks again for all the help!

Your winter set up doesn't have TPMS sensors, so yeah, that's why you're getting the warning light. If you have 2 sets of rims for winter/summer, each set should have their own set of TPMS sensors.

pfoyle 12-09-2012 12:27 PM

Great info, nstg8r, thanks! Kinda strange that NTB wouldn't have put TPMS in when I had the winters mounted on OEM rims... isn't it? Or is that something I should have specifically requested?

Other than having to stare at the warning light on my dash, is there any problem to running without the TPMS... obviously I would keep an eye on my pressure visually/manually to make sure they don't run too low... I'd rather not have to unmount/remount/etc if I don't have to...

ripemeat 12-09-2012 01:46 PM

You're suppose to request tpms, and they aren't cheap. Otherwise they use basic valve stems. The only issue is the annoying light, the BIU doesn't use tire pressure for anything.

jav2.5 12-09-2012 01:50 PM

When is someone gonna hack this feature so we can shut it off permanently? C'mon nerds, lets go, get on it!:spin:

ripemeat 12-09-2012 03:20 PM

BAC5.2 already did it, a while ago.... the search function is functional.

pfoyle 12-09-2012 04:24 PM

Ok, so I don't usually need to be spoon fed, but can you provide any more info ripemeat? Search function is only functional if you know what to search for! "TPMS" gives way too much info, "TPMS hack" didn't work, "TPMS reset" didn't work, "TPMS override" didn't work... even went through every thread BAC5.2 started and couldn't find it. I have no problem doing my own work, but any more help would be hugely appreciated!

Scooby Fan 12-09-2012 04:40 PM

You can only imagine how happy I was to learn that Canadian Subaru's do NOT come with TPMS....Oh JOY!!!

ripemeat 12-09-2012 05:08 PM

it's somewhere. i just deal with the light being on. or put a piece of tape over it.

nstg8r 12-09-2012 06:02 PM

Here's a slightly over-the-top way trick the TPMS system.

http://www.clublexus.com/forums/is-s...pipe-bomb.html


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