Toyota Yaris Forums - Ultimate Yaris Enthusiast Site
 

 


 
Go Back   Toyota Yaris Forums - Ultimate Yaris Enthusiast Site > Technical Forums > DIY / Maintenance / Service
  The Tire Rack

Reply
 
Thread Tools Display Modes
Old 05-11-2007, 11:27 AM   #1
rage2
 
Drives: 07 Black Yaris 5D
Join Date: Apr 2007
Location: Calgary, AB
Posts: 113
Anyone know how the passenger seat detection system works?

OK so I swapped the stock seats for some Sparcos (will have pics later after I wash the car) and I was trying to figure out how the sensors work to detect if there's a child seat (airbag off, seatbelt warning on) or a passenger (airbag on, seatbelt warning on).

Before taking the seats apart, I thought it was a simple weight sensor, boy was I wrong, it's the most complex thing I've ever seen for such a simple task. The stock seats sit on 4 pivotable points, so based on weight front of seat or full seat, it pivots differently. Each pivot point has what looks like a level sensor, and a harness connects all 4 of those pivot points into a little module called the "Occupancy Detection Computer". From there, it plugs into a harness to the car.

With the new seats, obviously, there's no pivot points like the stock seats, so my first test was to see the behavior without the little computer plugged in. Airbag light is on, Airbag is "OFF" and the seatbelt light keeps blinking regardless if the passenger seatbelt is plugged in or not. So next, I plugged in the computer but not the harness for the 4 level sensors, and same behavior.

I probably won't have a child seat in there, but I would like to rig up a small weight sensor in the seat that sends a signal back to the car, bypassing the occupancy detection computer, with either passenger in seat or no passenger. So with no passenger, airbag off, no seatbelt lights, no warning beeps. With passenger, airbag on, seatbelt lights + warning beeps.

Anyone know what the pinouts from the occupancy computer to the car is? What voltages to send to trick it into passenger or no passenger? Or am I SOL and stuck with no airbags on the passenger side?
__________________
rage2
My Yaris Diary - All about my new Yaris!
My Blog - F1 News, Hotties, and Random Crap
My Site - Beyond Car Forums
rage2 is offline   Reply With Quote
Old 05-11-2007, 11:29 AM   #2
rage2
 
Drives: 07 Black Yaris 5D
Join Date: Apr 2007
Location: Calgary, AB
Posts: 113
Oh as a note, the driver side is easy. There's only a seatbelt sensor, and a seat positition sensor along the stock rails (to trigger airbag deployment rate?), so that worked just fine.
__________________
rage2
My Yaris Diary - All about my new Yaris!
My Blog - F1 News, Hotties, and Random Crap
My Site - Beyond Car Forums
rage2 is offline   Reply With Quote
Old 05-12-2007, 04:51 PM   #3
blacksan
 
blacksan's Avatar
 
Drives: 07 Bayou Blue Liftback
Join Date: Apr 2007
Location: Virginia
Posts: 1,121
Front Seat

Geeez, you picked a tough one!
Attached Images
File Type: jpg Front Seat.jpg (108.5 KB, 148 views)
File Type: jpg Seat Belt Warning.jpg (92.3 KB, 143 views)
blacksan is offline   Reply With Quote
Old 05-12-2007, 05:21 PM   #4
Presto
 
Drives: 07 Yaris soon
Join Date: Apr 2007
Location: Oregon
Posts: 9
How did you mount the new seats? Did you remove the stock rails and attach them to the new seats?
Presto is offline   Reply With Quote
Old 05-12-2007, 07:12 PM   #5
rage2
 
Drives: 07 Black Yaris 5D
Join Date: Apr 2007
Location: Calgary, AB
Posts: 113
Quote:
Originally Posted by blacksan View Post
Geeez, you picked a tough one!
Would you happen to have the pinouts from the Occupant Classification ECU to the Center Airbag Sensor Assembly? Pinouts and expected voltage/data would be ideal, that way I can make my own weight sensor and my own Occupant Classification ECU.

Thanks!

Quote:
Originally Posted by Presto View Post
How did you mount the new seats? Did you remove the stock rails and attach them to the new seats?
Yes, I basically removed the stock seats from the stock rails, welded a new frame that connects the stock rails to the new seats.
__________________
rage2
My Yaris Diary - All about my new Yaris!
My Blog - F1 News, Hotties, and Random Crap
My Site - Beyond Car Forums
rage2 is offline   Reply With Quote
Old 05-12-2007, 07:22 PM   #6
blacksan
 
blacksan's Avatar
 
Drives: 07 Bayou Blue Liftback
Join Date: Apr 2007
Location: Virginia
Posts: 1,121
Quote:
Originally Posted by rage2 View Post
Would you happen to have the pinouts from the Occupant Classification ECU to the Center Airbag Sensor Assembly? Pinouts and expected voltage/data would be ideal, that way I can make my own weight sensor and my own Occupant Classification ECU.

Thanks!
PM me your e-mail and I will send the HUGE PDF file!
blacksan is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
DIY - Sparco Race Seat Install Idjiit DIY / Maintenance / Service 16 08-14-2017 09:15 PM
Back Seat Removal... Idjiit DIY / Maintenance / Service 87 02-08-2015 12:07 PM
Intake Systems Decision Maker.. Blenjar Performance Modifications 25 09-15-2007 10:07 PM
PASSENGER SEAT AND THE AIRBAG LIGHTS mrrock DIY / Maintenance / Service 0 04-02-2007 09:24 AM


All times are GMT -4. The time now is 12:38 PM.




YarisWorld
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.