I'm sitting in the tire shop right now for my 97 LS400. And I was thinking about some of the information that I have read here on the forum about disabling the TPMS System on their SC's. But the thought came to me as the new owner of a 2002, not knowing everything that has ever been done to the car, and not having a spare, AND not using run flats, how would I know if my TPMS hasn't already been disabled? Is there anyway to verify its still functioning besides letting air out of a tire? Or is that just the easiest way? Thanks.
Paul

 

Don't you see the tire symbol when you first start the car?

 

I see all kinds of lights. But I never associated the TPMS Light with it being enabled or disabled. I'm assuming here from the question that if that light comes on when I first turn the key that it is enabled and if I don't see it it's disabled? I'll be checking in a little while.
Paul

 

Simple, Techstream will tell if the sensors are good or bad, from there you can figure out if your TPMS has been disabled

 

Deflate one of the tires and you'll know for sure if it's working or disabled.

 

LOL. I dont have Techstream yet. I'll see if my iCarsoft i905 DTC Scanner can detect it.
Paul

 

Well. The i905 surprised me again. It not only gave me tire pressure. It gave me tire temps and Battery voltage from each wheel.
Paul

 

Nice tool!
same info TechStream provides!

 

What is the chance all four tires are the exact same temperature to a tenth of a degree?
Just asking.

 

Would you happen to know what full batt voltage is? The i905 was an accidental buy for me. But it properly diagnose my top failure too. Dead on. I need to start going through YouTube and see what exactly I can do with it. I'm a big proponent of everyone having their own scanner. It's just one of those things that we only pull out when somethings wrong. And I know it can do more than that. A lot more.
Paul

 

Good question. She had been parked jnder a carport all day and hadn't moved. These are after a couple of short drives.

 

Good to see you're getting different values under differing circumstances.... Here is a chart with the Reference Values for the TPMS sensors. As well as a PDF with component locations throughout the car. (02-06 year models)

 

Perfect. Battery voltage min is 1.8V. That means I probably have awhile before I have to change them out. Considering the best price I have found for a set of four was $322.58. I can use that for a couple of other things right now.
Paul

 

Under the ideal climate conditions they should last a long long time. Mine are the original ones, knock-on-wood, installed in April 2001, with all still working.

 

Hmmm, three of mine are dead, after 12 years in service.