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Are newer tpms sensors movement activated? #4804186
07/03/18 03:28 PM
07/03/18 03:28 PM
Joined: Dec 2012
Posts: 672
Washington for now
WhyMe Offline OP
WhyMe  Offline OP

Joined: Dec 2012
Posts: 672
Washington for now
i recall reading that newer TPMS sensor are now movement activated. this is done to conserve battery. is this true?

Re: Are newer tpms sensors movement activated? [Re: WhyMe] #4804204
07/03/18 03:53 PM
07/03/18 03:53 PM
Joined: May 2016
Posts: 725
Canada
i_hate_autofraud Offline
i_hate_autofraud  Offline

Joined: May 2016
Posts: 725
Canada
They can be depends on who makes them and the system.

It's also possible the car sends a signal and wakes them up when you start to drive.

Re: Are newer tpms sensors movement activated? [Re: i_hate_autofraud] #4804210
07/03/18 03:59 PM
07/03/18 03:59 PM
Joined: Oct 2002
Posts: 36,897
Great Lakes
Quattro Pete Offline
Quattro Pete  Offline

Joined: Oct 2002
Posts: 36,897
Great Lakes
Originally Posted By: i_hate_autofraud
It's also possible the car sends a signal and wakes them up when you start to drive.

Which means they would have to be constantly listening for the "wake up" signal, and that in itself would be chewing up their battery.


'02 530i (Edge 0W-40)
'15 Q5 3.0T (Edge 5W-40)
'18 Charger SRT (PUP 0W-40 SRT)
Re: Are newer tpms sensors movement activated? [Re: WhyMe] #4804247
07/03/18 04:56 PM
07/03/18 04:56 PM
Joined: Feb 2012
Posts: 435
MA, USA
krzyss Offline
krzyss  Offline

Joined: Feb 2012
Posts: 435
MA, USA
Listening to radio is usually less energy consuming than transmitting. So if “do not tell until asked” is implemented it may preserve battery life. Motion activation would be even better. I think engineers are using all the tricks available to save battery life.

Krzyś

Re: Are newer tpms sensors movement activated? [Re: WhyMe] #4804256
07/03/18 05:01 PM
07/03/18 05:01 PM
Joined: Jun 2015
Posts: 728
Arizona
Kawiguy454 Offline
Kawiguy454  Offline

Joined: Jun 2015
Posts: 728
Arizona
They are in sleep mode. I believe the sensors are micro-machined electrical mechanical MEMS with on-board firmware signal conditioning. One of the features are nano current sleep mode. any movement of the device triggers the output. Output is nothing more than a bursted data packet. If the receiver is listening it will receive and decode the packet. They also go to sleep in between output pulses so the battery can last a couple of years.

Last edited by Kawiguy454; 07/03/18 05:09 PM.
Re: Are newer tpms sensors movement activated? [Re: WhyMe] #4804285
07/03/18 05:18 PM
07/03/18 05:18 PM
Joined: Nov 2012
Posts: 519
Ajax,Ontario, Canada
Pelican Offline
Pelican  Offline

Joined: Nov 2012
Posts: 519
Ajax,Ontario, Canada
On my 2017 RX 350 you have to wait a few minutes after being underway before you can get a read from the TPMS which leads me to believe that they must be in sleep mode.

Re: Are newer tpms sensors movement activated? [Re: WhyMe] #4804452
07/03/18 07:55 PM
07/03/18 07:55 PM
Joined: Dec 2002
Posts: 42,561
New Jersey
JHZR2 Offline
JHZR2  Offline

Joined: Dec 2002
Posts: 42,561
New Jersey
You may be thinking of ones that rely upon wheel speed differences instead of a pressure transducer.

My Honda Accord doesnt have any sensors in the wheel (fortunatelY). It uses an analysis of minute differences in wheel rotation.

Knock on wood, my BMW sensors still work.

Not sure what the lifetime of the batteries in these things are.

It would be sensible for the batteries to be isolated to avoid any quiescent drain.

Re: Are newer tpms sensors movement activated? [Re: WhyMe] #4804540
07/03/18 09:25 PM
07/03/18 09:25 PM
Joined: Dec 2017
Posts: 3,690
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline

Joined: Dec 2017
Posts: 3,690
SE British Columbia, Canada
Good question on the batteries in the TPMS system. 3 of the 4 sensors on my 10 year old Suburban are original and still work. One died and I ordered a package of 4 from Amazon. I gave one to the tire shop and they de-mounted the tire, installed the new sensor and activated it. I’ll do the other three when I toss these tires and buy new ones later this year.

Last edited by Snagglefoot; 07/03/18 09:27 PM.

If you want the job done right......do it yourself.
Re: Are newer tpms sensors movement activated? [Re: WhyMe] #4804618
07/04/18 12:14 AM
07/04/18 12:14 AM
Joined: Feb 2013
Posts: 11,230
Phoenix, AZ
Nick1994 Offline
Nick1994  Offline

Joined: Feb 2013
Posts: 11,230
Phoenix, AZ
I've got to be moving in my Sonata for my tire pressure to display, maybe that's the same thing?


2015 Hyundai Sonata 2.4L 91k Motorcraft Synthetic Blend 5w30 & OEM
2000 Toyota Camry 2.2L 232k Valvoline 5w30 & Fram Ultra
1996 Jeep Cherokee 4.0L 148k Mobil 1 HM 10w40 & Fram Ultra
Re: Are newer tpms sensors movement activated? [Re: WhyMe] #4805854
07/05/18 12:20 PM
07/05/18 12:20 PM
Joined: May 2016
Posts: 725
Canada
i_hate_autofraud Offline
i_hate_autofraud  Offline

Joined: May 2016
Posts: 725
Canada


Years back, a hardware wireless application called "telepanel" had receivers and a CPU
that would 'wake up' and listen for 1 second and stay asleep 10 seconds and do it all
over again for years on 1 battery.

If there was an active data stream starting with a unit serial number, it would stay
on and turn off after data was received.

Re: Are newer tpms sensors movement activated? [Re: WhyMe] #4805954
07/05/18 01:41 PM
07/05/18 01:41 PM
Joined: Jul 2013
Posts: 1,248
Dana Point, CA
splinter Offline
splinter  Offline

Joined: Jul 2013
Posts: 1,248
Dana Point, CA
GMC = static readings at initial key on.

Porsche = readings only after exceeding ~20-MPH threshold.


M1 0W-40
T6 5W-40
PUP 0W-40



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