How does (very sensitive) passenger seat seat belt sensor work? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

GrantedTaken · 09-16-2018, 12:00 PM

If I place my cell phone on the passenger seat,
it thinks someone is sitting there, and starts beeping a warning.

Are there sensors in the mesh?
Or is the seat being weighed?

It's pretty damn accurate!
Impressive

murdoc · 09-16-2018, 12:36 PM

It's a capacitive sensor, so anything with an electric field will trigger it.

Brink · 09-16-2018, 12:36 PM

You must have a heavy cell phone. I put a backpack or gym bag (cell phone is usually in the gym bag too!) on the passenger seat all the time and it doesn't trigger the sensor.

GrantedTaken · 09-16-2018, 12:40 PM

I got lazy and did not search.
It's based on electrical signal not weight.
A cell phone triggers this very easily.
A bucket of paint does not.

Besides keeping the passenger seat belt locked,
anyone have a trick to get around this?

I might place a little container in the passenger seat.
Like the airline TSA "empty your pockets" bins.

amcluesent · 09-16-2018, 01:54 PM

You can disable the seatbelt 'ding' using Carista app

extrashaky · 09-16-2018, 04:14 PM

A wet umbrella tossed onto the passenger seat can also trigger the sensor.

I put one phone in a phone mount on the dash (of my own design), but I use one of these caddies from the As Seen On TV store at the mall to carry my second phone, my wallet and my beverage:

[ame]https://www.youtube.com/watch?v=BsEqRnlXFkE[/ame]

humfrz · 09-16-2018, 04:22 PM

Quote:

Originally Posted by GrantedTaken

I got lazy and did not search.
It's based on electrical signal not weight.
A cell phone triggers this very easily.
A bucket of paint does not.

Besides keeping the passenger seat belt locked,
anyone have a trick to get around this?

I might place a little container in the passenger seat.
Like the airline TSA "empty your pockets" bins.

This post is a double

er.

First off - search.

Second off - just don't put your cell phone on the seat.

Got it -

humfrz

gravitylover · 09-16-2018, 09:28 PM

Don't put a bag of chips on the seat if it's a lined bag, even that will set the stupid thing off. The charger wire will also set it off if it's plugged in and flops over on the seat. Big PITA...

FRSBRZGT86FAN · 09-16-2018, 10:13 PM

Quote:

Originally Posted by GrantedTaken

I got lazy and did not search.
It's based on electrical signal not weight.
A cell phone triggers this very easily.
A bucket of paint does not.

Besides keeping the passenger seat belt locked,
anyone have a trick to get around this?

I might place a little container in the passenger seat.
Like the airline TSA "empty your pockets" bins.

Quote:

Originally Posted by amcluesent

You can disable the seatbelt 'ding' using Carista app

amcluesent hit it on the nail, disabling the warning light and beep in an OBD-II app or even a pirated version of tech stream is the best option, no warranty issues or electrical fuckery. Just a simple edit and change and when the battery is pulled it will reset.

Also important note is that if the seat gets wet it will also trigger the sensor, although I'm pretty sure there is a different DTC for the seat being wet vs something being on there internally, but all we see is the beep or passenger seat belt warning light.

Here's a post that explains it best:

https://www.ft86club.com/forums/show...0&postcount=22

FRSBRZGT86FAN · 09-16-2018, 10:16 PM

Quote:

Originally Posted by Brink

You must have a heavy cell phone. I put a backpack or gym bag (cell phone is usually in the gym bag too!) on the passenger seat all the time and it doesn't trigger the sensor.

Try just the phone without a case and see what happens, I've had my swiss army school backpack in the seat without it triggering the seat sensor as well, also with a laptop and phone inside. It just blocks the signal from interfering with the seat sensor.

Mach Midnight · 09-30-2018, 08:31 PM

Dealer can shut off these options using their Techstream software. I was quoted $60 to shut off this sound. Or, buy a cable and cracked Techstream ~$20.

Tcoat · 10-01-2018, 09:46 AM

The Carista app can also turn the chime off as well as many other things. Don't know how the cost compares to a legit Techstream but there may be a savings to be had.

https://caristaapp.com/vehicles/scion/fr-s/1st-gen

ermax · 10-01-2018, 10:12 AM

My charger cable will even trigger it. I guess it has the advantage of not wearing out like the older membran weight based sensors. Like others, I disabled mine with Techstream.

Dake · 10-01-2018, 12:09 PM

A certain amount of weight does activate it as well though. My beagle is 35 lbs and if he sits just right in the seat, he'll trigger the warning. I think it triggers for less though, I'm pretty sure I had a couple gallons of milk there and that was also enough.

09-16-2018, 12:00 PM	#1
GrantedTaken Banned Join Date: Nov 2017 Drives: BRZ Location: The Sun Posts: 428 Thanks: 30 Thanked 230 Times in 113 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	How does (very sensitive) passenger seat seat belt sensor work? If I place my cell phone on the passenger seat, it thinks someone is sitting there, and starts beeping a warning. Are there sensors in the mesh? Or is the seat being weighed? It's pretty damn accurate! Impressive

09-16-2018, 09:28 PM	#8
gravitylover Senior Member Join Date: Nov 2014 Drives: 2013 BRZ Premium 6MT White Location: SE NY Posts: 1,503 Thanks: 1,218 Thanked 669 Times in 474 Posts Mentioned: 7 Post(s) Tagged: 1 Thread(s)	Don't put a bag of chips on the seat if it's a lined bag, even that will set the stupid thing off. The charger wire will also set it off if it's plugged in and flops over on the seat. Big PITA... __________________

10-01-2018, 09:46 AM	#12
Tcoat Senior Member Join Date: Jul 2014 Drives: 2020 Hakone Location: London, Ont Posts: 69,845 Thanks: 61,656 Thanked 108,283 Times in 46,456 Posts Mentioned: 2495 Post(s) Tagged: 50 Thread(s)	The Carista app can also turn the chime off as well as many other things. Don't know how the cost compares to a legit Techstream but there may be a savings to be had. https://caristaapp.com/vehicles/scion/fr-s/1st-gen __________________ Racecar spelled backwards is Racecar, because Racecar.

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09-16-2018, 12:36 PM	#2
murdoc Sometimes I'm wrong. Join Date: Mar 2013 Drives: '13 FR-S/'96 240SX Location: Frederick, MD Posts: 366 Thanks: 91 Thanked 316 Times in 152 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	It's a capacitive sensor, so anything with an electric field will trigger it.

09-16-2018, 12:36 PM	#3
Brink Senior Member Join Date: Apr 2017 Drives: 2017 BRZ Location: CA Posts: 665 Thanks: 200 Thanked 392 Times in 236 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	You must have a heavy cell phone. I put a backpack or gym bag (cell phone is usually in the gym bag too!) on the passenger seat all the time and it doesn't trigger the sensor.

09-16-2018, 12:40 PM	#4
GrantedTaken Banned Join Date: Nov 2017 Drives: BRZ Location: The Sun Posts: 428 Thanks: 30 Thanked 230 Times in 113 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	I got lazy and did not search. It's based on electrical signal not weight. A cell phone triggers this very easily. A bucket of paint does not. Besides keeping the passenger seat belt locked, anyone have a trick to get around this? I might place a little container in the passenger seat. Like the airline TSA "empty your pockets" bins.

09-16-2018, 01:54 PM	#5
amcluesent Member Join Date: Jun 2016 Drives: GT-86 Location: Scotland Posts: 53 Thanks: 38 Thanked 84 Times in 39 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	You can disable the seatbelt 'ding' using Carista app

09-16-2018, 04:14 PM	#6
extrashaky Senior Member Join Date: Mar 2014 Drives: 2014 BRZ Limited Location: USA Posts: 4,045 Thanks: 1,100 Thanked 5,618 Times in 2,266 Posts Mentioned: 55 Post(s) Tagged: 1 Thread(s)	A wet umbrella tossed onto the passenger seat can also trigger the sensor. I put one phone in a phone mount on the dash (of my own design), but I use one of these caddies from the As Seen On TV store at the mall to carry my second phone, my wallet and my beverage: [ame]https://www.youtube.com/watch?v=BsEqRnlXFkE[/ame]

09-30-2018, 08:31 PM	#11
Mach Midnight ＭＩＤＮＩＧＨＴ Join Date: Sep 2016 Drives: MY16 Raven Location: Weast Posts: 17 Thanks: 4 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Dealer can shut off these options using their Techstream software. I was quoted $60 to shut off this sound. Or, buy a cable and cracked Techstream ~$20.

10-01-2018, 10:12 AM	#13
ermax Senior Member Join Date: Sep 2017 Drives: 2022 BRZ Limited Silver Location: Jacksonville, FL Posts: 2,532 Thanks: 882 Thanked 2,045 Times in 1,188 Posts Mentioned: 68 Post(s) Tagged: 0 Thread(s)	My charger cable will even trigger it. I guess it has the advantage of not wearing out like the older membran weight based sensors. Like others, I disabled mine with Techstream.

10-01-2018, 12:09 PM	#14
Dake Senior Member Join Date: Aug 2012 Drives: FR-S Location: Houston Posts: 1,056 Thanks: 464 Thanked 819 Times in 414 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	A certain amount of weight does activate it as well though. My beagle is 35 lbs and if he sits just right in the seat, he'll trigger the warning. I think it triggers for less though, I'm pretty sure I had a couple gallons of milk there and that was also enough.

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