TMPS how does it work? - ClubLexus - Lexus Forum Discussion


IS - 2nd Gen (2006-2013) Discussion about the 2006+ model IS models

TMPS how does it work?

Reply
 
 
 
Thread Tools Search this Thread
Old 10-11-17, 05:38 PM   #1
sparta3993
Driver
Thread Starter
 
Join Date: May 2014
Location: california
Posts: 110
Thanked 0 Times in 0 Posts
Default TPMS how does it work?

Bought a very reasonably priced set of used 18s for my 250. Owner gave a great deal as the age of the tmps was unknown. I’m assuming the tmps are from 06 as the tires are the Dunlop sp sport Maxx which was the oem tire for these 18s?!?!?! (Rims look very clean, inside and out, so almost willing to bet tires were never changed).
Anyway I thought I knew what I was doing.

My current 18s, tires, and tmps (in black) were programmed to “my car”.....
The 18s, tires, and tpms (in red) were not programmed to my car.... so it was safe to say the tmps sensor would trip.... right?

I mounted the red set, head down to fountain tire so they can reprogram them. I left one of the black 225 as a spare just in case these old tires gave out..... the tpms light didn’t turn on??? Fountain tire tells me my drivers fronts sensor needed to be replaced... okay great Kal tire said the same thing even though we deflated my passenger rear to trip the sensor...... what gives? So after 50 miles of driving, playing what the initial, main, and 2nd, 1 mile away from home the tmps light came on. All my tires have the pressure...

Called lexus service and the service tech said “if they are the same style rims there is a good chance the Lexus computers reading the tpms in the red set.

now I’m parked in the garage... black set stacked in front of my bumper. Red set on the car, with the tmps light on now....

Not only did I hate tmps to start with, but why did they have to make the system so freaking complicated?

any idea why it didn’t trip the sensor with the red set? And why it got tripped as soon as I arrived to my street?
Attached Thumbnails
TMPS how does it work?-70c6a798-0576-4ea6-a786-5e3962db62d5.jpeg  

Last edited by sparta3993; 10-12-17 at 08:30 AM.
sparta3993 is offline   Reply With Quote
Old 10-11-17, 06:46 PM   #2
Htony
Lexus Test Driver
 
Join Date: Sep 2016
Location: AB
Posts: 805
Thanks: 0
Thanked 51 Times in 44 Posts
Default

TPMS has built in battery which has definite life span. Did they trigger/scan the TPMS? Good TPMS should give out id. PSI, temperature, state of battery.
Since already one is gone dead, remaining 3 TPMS life span is in question. If I were you, I'd replace them all at this time.TPMS sleeps, when car is in motion
it wakes up and signal is sent to TPMS receivers. That is why you need trigger/scan tool to work on them. I use Autel TPMS tool and Tech stream when working
with them.

Last edited by Htony; 10-11-17 at 06:51 PM.
Htony is offline   Reply With Quote
Old 10-11-17, 08:47 PM   #3
sparta3993
Driver
Thread Starter
 
Join Date: May 2014
Location: california
Posts: 110
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by Htony View Post
TPMS has built in battery which has definite life span. Did they trigger/scan the TPMS? Good TPMS should give out id. PSI, temperature, state of battery.
Since already one is gone dead, remaining 3 TPMS life span is in question. If I were you, I'd replace them all at this time.TPMS sleeps, when car is in motion
it wakes up and signal is sent to TPMS receivers. That is why you need trigger/scan tool to work on them. I use Autel TPMS tool and Tech stream when working
with them.
Thanks for that info but my focus is on the warning light. Tires were scanned that’s how I know the ones low battery...... since the battery was low they never programmed the red set to the car so I’m wondering why the black set that was already programmed and working, is not showing a warning light?

“why did the sensor not trip when the red set was mounted on the car...... why did it take 50 miles to trip? Most importantly why did the warning light not turn off after I parked the car in the garage with the black set sitting in front of the car?”
sparta3993 is offline   Reply With Quote
Old 10-11-17, 09:47 PM   #4
Htony
Lexus Test Driver
 
Join Date: Sep 2016
Location: AB
Posts: 805
Thanks: 0
Thanked 51 Times in 44 Posts
Default

Quote:
Originally Posted by sparta3993 View Post
Thanks for that info but my focus is on the warning light. Tires were scanned that’s how I know the ones low battery...... since the battery was low they never programmed the red set to the car so I’m wondering why the black set that was already programmed and working, is not showing a warning light?

“why did the sensor not trip when the red set was mounted on the car...... why did it take 50 miles to trip? Most importantly why did the warning light not turn off after I parked the car in the garage with the black set sitting in front of the car?”
Have you register the new TPMS into the ECU? Installing it does not do anything until you make the ECU relearn them.
Htony is offline   Reply With Quote
Old 10-12-17, 01:06 AM   #5
lovekeiiy
Driver School Candidate
 
Join Date: Sep 2017
Location: CA
Posts: 30
Thanks: 0
Thanked 1 Time in 1 Post
Default

You have to reprogram the TPMS anytime you disconnect the battery and change the tires. I had that issue with I got my car and Lexus changed the front tires. Light went on ten minutes down the road.
lovekeiiy is offline   Reply With Quote
Old 10-12-17, 05:23 AM   #6
jr4div2
Pole Position
 
Join Date: Mar 2017
Location: PA
Posts: 257
Thanks: 0
Thanked 10 Times in 10 Posts
Default

Quote:
Originally Posted by sparta3993 View Post
Thanks for that info but my focus is on the warning light. Tires were scanned that’s how I know the ones low battery...... since the battery was low they never programmed the red set to the car so I’m wondering why the black set that was already programmed and working, is not showing a warning light?

“why did the sensor not trip when the red set was mounted on the car...... why did it take 50 miles to trip? Most importantly why did the warning light not turn off after I parked the car in the garage with the black set sitting in front of the car?”
The TPMS warning light is not immediate. It takes some time and averaging for it to decide if the pressure is in our out of spec. Apparently it just took the 50 miles to realize it lost contact with the black set. As far as the black set sitting in front of the car and the light not going off, again it takes time and driving for the light to change state.
jr4div2 is offline   Reply With Quote
Old 10-12-17, 08:23 AM   #7
sparta3993
Driver
Thread Starter
 
Join Date: May 2014
Location: california
Posts: 110
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by jr4div2 View Post
The TPMS warning light is not immediate. It takes some time and averaging for it to decide if the pressure is in our out of spec. Apparently it just took the 50 miles to realize it lost contact with the black set. As far as the black set sitting in front of the car and the light not going off, again it takes time and driving for the light to change state.
Thank you!!! Someone actually read what I was asking! So that makes perfect sense, but I’m wondering why it took so long to come on. Because with the black set if I lose a little air, or a battery is dead. The lights on within 20 seconds of ignition.

so seeing nothing’s been “relearned” mouting the already programmed black set should turn off the light after a while??!?!? Or have I throughly confused the ecu?
sparta3993 is offline   Reply With Quote
Old 10-12-17, 08:36 AM   #8
jr4div2
Pole Position
 
Join Date: Mar 2017
Location: PA
Posts: 257
Thanks: 0
Thanked 10 Times in 10 Posts
Default

Mount the black set and drive around. The light should go off. Go get the TPMS sensors replaced in your red set at a good tire place and they should be able to program them into the ECU. Also, you can keep two sets programmed and switch them with the <0> buttons to the left of the steering wheel. This allows for a summer set and a winter set, but you could have one for your black set and red set whichever you wish.
jr4div2 is offline   Reply With Quote
Old 10-21-17, 08:21 PM   #9
sparta3993
Driver
Thread Starter
 
Join Date: May 2014
Location: california
Posts: 110
Thanked 0 Times in 0 Posts
Default

Thanks for everyones help. Again my concern was why the TPMS light was not tripped right off the bat. I threw the Black set back on and without even driving the light turned off.

I know exactly how TPMS "should" work, though not when the system is acting funny.

The black set makes perfect sense. mount 3 blacks and 1 red, lights on.... Mount all black, lights off. Drop the pressure in one of the blacks, light goes on....
The red set makes no sense. TPMS light is off no matter what you do..................

And just for everyones sake I bought a new set of TPMS for the red set and installed them all today. Programmed them to the car, check. Drove around, check. Dropped the air in two tires to 15psi, check. TPMS lights still off, check..... what????? how the hell? So go back throw all the black sets on, check. Drive about 5 miles down the road to my buddies house (we erased the black set so the TPMS light is currently on). When we get there we reprogram the black set again. TPMS turned off without moving the car, check. Drop the pressure in one of the tires to 30 psi and the TPMS light comes on, check.......

Lexus allowed me to return the sensors, so I bought some Toyota ones with he same results. For the heck of it I threw the Toyota TPMS into my Tacomas winters... Oh wow they worked?

THIS MAKES NO SENSE

I don't know how to dumb it down more then that. Lexus says its because the rims were programmed to the same generation and model?!?!?! still makes no sense?
sparta3993 is offline   Reply With Quote
Old Yesterday, 12:39 AM   #10
lovekeiiy
Driver School Candidate
 
Join Date: Sep 2017
Location: CA
Posts: 30
Thanks: 0
Thanked 1 Time in 1 Post
Default

Sounds like it's not your sensors but whatever they give their readings to.
lovekeiiy is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
2007 Lexus RX350 TPMS Main/2nd selection mrlag RX - 2nd Gen (2004-2009) 2 09-05-17 08:33 AM
TMPS Calibration Issues with Dealer Onpoint GS - 4th Gen (2013-present) 3 07-14-17 12:10 PM
'13 TPMS on '07? LS2k LS - 4th Gen (2007-2017) 18 11-12-16 02:05 PM
TPMS problem after flat tire 08sgmis350 GS - 4th Gen (2013-present) 10 09-16-16 06:37 PM
TPMS sensors - OEM only or aftermarket JDJackson LX - 3rd Gen (2008-present) 8 03-16-16 07:48 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -7. The time now is 06:49 AM.


Copyright © 2000-2017 Internet Brands, Inc. All Rights Reserved
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: