olddragger

iTrader: (3)

Can someone show/tell me where the weight sensor is located in the recardo seat? Its not in the bottom cushion.
I see the side air bag wire, the rail position wire/sensors and the main connector---but no weight sensor anywhere?
OD

SpencerM1

iTrader: (1)

Not trying to be funny here but I noticed this one time. After a trip to the liquor store I buckled my Scotch into the passenger seat. The "no airbag" light came on the acc. display and I wondered what would turn it off. I then pushed down on the Scotch and it went off if I pushed hard. Making me think it is in the seat cushion.

Hope that helps. Scotch is not a requirement for this experiment but it might help.

olddragger

iTrader: (3)

Lol---Johnny Red or Black? Or some of the Royal family?
That does help, but I swear to God there is no wire going to the seat cushion, I have had the seat totally apart. There are only 4 bolts that hold the seat cushion on.

jrx13

From my understanding, and I could be wrong. The seat weight sensor is on the passenger side seat only. The driver side seat uses position sensors only. The weight sensor is only to detect if a child is riding in the passenger seat so the system will disable the passenger air bag, hence the light on the dash.

olddragger

iTrader: (3)

i understand that.
I have had the passengers seat completly dissaembled and there is not any wire going to the bottom cushion at all. These are the Recado R3 seats and they too are advertised to have them just like the others.
So where the hell are they????

olddragger

iTrader: (3)

Eureka---found them!.
They are on the rails and are magnetic--no wire to the bottom cushion needed.
But if you ever remove your seat from the car you have to take the car to the dealer to have them reset the Zero setting of the sensors.
OD

jrx13

Yes you are supposed to......but how many non dealership body shops do you really think do??? Or how many seat upholstery guys or car audio installers. Probably none to barely any. And all those guys swapping seats? Count them out too.

The dealership has calibration weights bags that you put on the seat cushion and you hit calibrate buttons with the dealer scan tool. If you sublet it to them, make sure they have the weights and you get a good tech to do it.

I have an autoenginuity scan tool and I think it can do it too, but youll need some weights and I don't know how many pounds. Were you just drying out the cushions and now putting the seats back together?

olddragger

iTrader: (3)

i took the seats out, the carpet out, console out to check all the wiring and connections of all my harness's.
I got an unbelieveable priced salvage R3. Flood car ---water line did not touch the seat bottoms.
I got very lucky--its runs and purrs like a kitten, the only thing i have had to do is to replace a throwout bearing, clean it up a little and a few corroded interior harness connections.
Air bag stuff is solid.
The people who had the car did not know how to start a flooded rotary.
Thanks for your help dude
OD

parnellj48

Sorry to res this back from 2010 but i just had my srs light come on yesterday on my 09 r3. My scanner shows B2290 "occupant classification system fault, front passenger side." This is the 2nd time in a year that the srs light came on with no one in the pass seat. Just driving along and srs light flashes, seat belt chime and pass airbag off lights come on. But you start it up the next morning and no lights are on. The only objects in the seat where my sunglasses and my phone. Could that be causing the airbag light to come on? Lots of searching and this is the closest thing i can find for the recaro passenger seat detection stuff. Thanks for any advice you may have.

wannawankel

It is either caused by the plug connections, wire short, or from the sensor itself according to how it is wired in the online wiring diagram. You would have to isolate which one component is cuasing this. My beust guess is that the connection may be dirty or loose due to rear passenger's feet or objects being stuffed under the seat.

majbthrd

"magnetic" may not be the right term for these sensors. I believe "strain gauge" is a more accurate term. These gauges measure the imperceptibly small deflection of the seat rails in real-time in response to the weight of the person (or bottle) on the seat. The seat cushions are simply not involved.

I'm currently trying to diagnose a B2290 fault code on a 2007 (GT package), and Mazda's 2008 factory manual is grossly inadequate. Mazda's diagnostic procedure is oblivious to the presence of the sensors; what they call a "seat weight sensor module" (part number FE87-67-SW0, the box located in the bottom back right of passenger seat) is the digital circuitry to digitize the strain gauge signals and send the seat status and weight estimate over the CANbus (to the airbag controller).

That's why the "seat weight sensor module" has three connectors on it. The large one provides power and CANbus; the two smaller ones each go to one of the two sensors.

Whoever wrote the Mazda manual's diagnostic procedure seems to have not considered the possibility that the sensors would go bad. (The supplier appears to be Takata... where have I hear that company's name before.? ) Perhaps re-zero-ing would help, but this seems to be dealer-only. Certainly, FORscan is *utterly* useless at resetting what they call the "OCS"; it just throws up "interrupted" errors.

I'm not sure what year these sensors were adopted, but a junkyard 2005 (GT?) did not have them, but a 2007 (Sport w/ DSC) did.

Alas, there is no way to separate the sensors; they are an integral part of the seat rails. The seat rails have Mazda part numbers that no online parts vendor seems to list.

Sorry for unearthing an old thread, but it was one of the few to have any related information, and this hopefully adds some more insight into what is going on.