rominl

iTrader: (4)

yes, you will need to program to 2nd set of tpms

Johnny

I recall the spare tire on my 600 occupied position 3 on the display, so the order set in the CPU may be random from one car to another. Evidently, there is no fixed logic to it.

daryll40

I am OCD about tire pressures. Bot my 07 LS in Oct 07 and traded for an 09AWD in Aug 09. Both cars show(ed) tire pressures that EXACTLY agree with my $50 digital gauge. I never reset the TMPS ever. I check the tires cold in my garage in the morning twice a month and always after service (because they always fool with em).
Set em at 33 usually but will add or subtract 1.5 pounds in extreme heat or cold. Set spare at 40 and refill when it dips to 37 (months and months).

mrgsquared

How do you reset the the tire pressure benchmark on a 2007 LS 460. The manual shows a reset button on the right side of steering column, but I sure cannot find it. Any help is truly appreciated.

jmcraney

I can't tell if you are just looking for the switch or how to do a complete "TPMS Benchmark Set".

The switch is located under the dash, about 6 inches forward of the lower dash margin, near your right knee when you are sitting in the drivers seat.

cardenje

Does anyone know what is the purpose of the **** (with white dot) to the right of the "reset" button?

cmasten

That adjusts the volume of the external chirp or chime that you hear when you arm your vehicle or lock/unlock your doors, as I recall

outbid81

The proper way to set the "benchmark" is to set the pressure according to the door jam sticker. Then, based on climate, upcoming weather, customer preference, etc., raise the pressure accordingly. Example: Customer comes in for service in late September. Based on service history this driver puts on about 10k miles a year. If the tech performing the service put in the recommended pressure and reset the system, that light would come on in about 1-2 months (in Wisconsin anyway). So to combat the falling temps of the upcoming months and the fact that he won't see the car for maybe 5-6 months, he adds air after the system has reset. The light will still come on when the pressure drops to 80% of the base (door jam) pressure. Hence, after a service seeing 36ish psi on your display. The only way to tell what the benchmark minimum is is to have the tech print the TPMS report from the Techstream scan tool and have them give it to you with your paperwork.

llll1lll1

ABbirds

press the DISP button on my steering wheel for the 1st time(2012 LS 460) until I see the tire pressure #, it shows 32/40/40/40/40. So even the spare tire is connected to tire pressure monitor?

I understand in this thread most said there is no way to know which number goes with which wheel..is this still true for 2012 model?

FatherTo1

I believe it was with the 2013+ facelift and interior upgrade that brought the ability to know exactly which tire has what pressure.

johnnyg66

How i check is adjust one tire than read the display so you see what tire is what reading. For me my spare is always on top. As you rotate keep that in mind the display reading does not move just the tire.

Paul1307

I realize this is a very old thread, but the question of tire pressure always comes up.
FWIW, here is my recommendation based on many decades of driving a variety of vehicles, and nearly two decades of driving my good old '98 GS 400.
I use the "85% Rule." The rule is simple: you look for the maximum tire pressure listed on the tire, then multiply it by .85, and that's the tire pressure I maintain. For a tire with a maximum pressure of 40 psi, that works out to 34 psi. For some Michelin tires that are rated at a maximum of 50 psi, it's about 43.5 psi - but who counts half pounds?
Why? Because underinflation leads to poor wear, and I've found this rule will keep a set of tires wearing evenly throughout their life.
As far as ride harshness goes, I really haven't noticed an remarkable difference.
Gas mileage is another matter altogether. With these inflation rules, by GS 400 used to pull 29 mpg on long, cross-country trips where the cruise control was set to 85 in those states where the speed limit is 75, and 75 where the speed limit is 65. 29 mpg! And it doesn't hurt in-town mileage either which I don't bother to calculate, but probably runs to about 16-18 mpg depending on the traffic.
The rule is simple to understand, and simple to implement.

jmcraney

The tire manufacturers and car manufacturers have colluded and agreed that for this car, and most tires, the best cold inflation pressure is 33PSI, all things considered, such as performance, ride comfort, safety, tire wear, gas mileage, etc. The TPMS supports a wide range of pressures, allowing the owner/operator to use a wide range of warning thresholds.

mckellyb

I go by feel, and I don't mean ride, and wear.

I've found on my touring-equipped '08 L, 39-40 is perfect for Fort Worth and how I drive it.

FWIW, high speed calls for a large increase in pressure. I meet those speed requirements almost daily.

We have some borderline insane traffic around here. 90+ MPH cruising speeds are common.