interesting. I just lowered my rear tires to 30psi from 34psi. I kept the front at 34psi.
I preferred 2-3PSI over the recommended numbers on the door.

 

Why only the rears?

 

because my front tire is almost the same as stock.
Original 245/40/18 => 33psi => load index = 1345lbs

New tires are 245/40/19 Front & 285/35/19 Rear

 

I'm not even going to pretend to understand that chart but it seems like you know what you're talking about. If i had gone to a bigger sized tire i would have just inflated to my reg limits(~32psi). Obviously i have a lot to learn before i change dia's .

 

So a quick update for anyone wondering about this. You can only set the 2006 tpms values by "re-pairing" the sensors in techstream. The pairing process is ABSURD. It gives you 5 minutes to add or remove 6psi from all 4 tires like some sort of timed competition. Except I did that and it didn't register them, it just unpaired them. So I tried to do it again and then it gave me an error every time about initialization and wouldn't let me try the registration sequence. So now my tpms sensors are unpaired and the light is on, lol.

I recently found out Costco will convert the tires to nitrogen for $35 (they also have a nitrogen pump for topping off in the future), so I'm going to do that anyway, I'll just have them pair the sensors with a real tool.

 

make sure Costco can actually program the TPMS sensors before you spend any money.
many stores say they can do it, then realize they don’t have the correct tool.
if your Costco can do it, it will be the first time I have heard of a store with the correct equipment.
there was a guy on here who owned a shop and he said his device was able to do the programming.

I have performed the TPMS programming three times and had success.
I would put about 40psi in the tires then let the pressure out until it triggered, sometimes more than 6psi reduction.
I never found it difficult.

question, can you perform checks, of the lights, door locks, windows etc with Techstream?
when I say perform checks, I mean, turn on/off, lock/unlock, move up/down
if not, your Techstream has a problem.

here is my adventure with TPMS programming
https://www.clublexus.com/forums/sc4...02-2006-a.html

 

I agree with BGW. Unless Costco has added new capabilities, they are not able to pair the SC430 TPS to the system monitor. (Neither can DTC.) I've paired mine a few times and it was quite easy, just be prepared to add air back into your tires afterwards or start out high like BGW did. The only times I wasn't able to pair was when I had a bad sensor battery and then another time when DTC replaced one of the sensors with a generic sensor. (They had to go back in and replace it with OEM and then it paired.) It is pretty simple with Techstream.

 

If you have Techstream it really not that hard. I assisted my son in Richmond, VA via the phone after he received the laptop I had sent him with Techstream V15 arrived. It's a 4 step process if I remember right.

Dennis

 

I'll have to sort out why it was giving me the error after the first attempt, or why it didn't seem to register any of the tires I let 6spi out of. If i can get rid of the error I'll try letting more out like you guys mentioned.

I didn't realize a "tire center" wouldn't be able to pair a tpms sensor, wow. Thanks for all the info.

 

Yeah, very few places can handle the SC430 TPS. Are you sure that the TPS are OEM or could they be generic?

 

just to confirm, Costco cannot program our TPMS as you guys said. Dealership wants $200, LOL. So it looks like I need to figure out why my techstream was erroring out and try again.

question about the process. Is there a specific order you're supposed to do the sensors in? How does it know which wheel is which sensor?

 

No order is necessary and it doesn't need to know what wheel the sensor is in. That is why you can rotate the tires at will with no issues. The six pounds pressure is just an estimate. I just started letting out air and my wife told me when the sensor registered. It was more than six pounds.

Just as an aside. Remember, our car was one of the first cars ever to have TPMS. It was not mandated until I think 07. So give the guys at Costco etc. a bit of a break. It is likely that the sensors that we use are the only ones they have ever seen like this. I know of no other sensor programed the way ours are. Generally you type in the "serial number" of each sensor. Also, the sensors changed in the SC in 07 to the newer type.

 

I'm not knocking costco, I'm just happy they have a very reasonable nitrogen conversion and free nitrogen pumps.


If it doesn't need to know which is which, how does it know the fronts are X pressure and the rears are Y pressure? I have a staggered wheel/tire setup so the pressure are not the same all around. I also need to plug in the new PSI values for each axle which is what got me started doing this in the first place.

 

It doesn't know front from back. It just knows the color sensor that the pressure is associated.

 

Without disassembling the wheel, I won't have any way of knowing which color corresponds to which wheel, correct?

I really wish I had taken a screenshot before I accidentally unpaired them.

EDIT: I just realized once they're paired I can just add air 1 by 1 and see which color sensor changes pressure. Then repair them with the correct PSI a 2nd time.