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BRZ Second-Gen (2022+) -- General Topics General topics for the second-gen BRZ


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Old 10-31-2022, 03:48 AM   #1
X25
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Base model BRZ - What do you need to bypass airbag light errors with race seats?

I've just replaced the front seats with race seats. The connections are actually pretty simplistic, and there are only seat belt (carried over) AND airbag plugs for driver, and there's also an occupant sensor for the passenger.
  • Airbag circuit resistance: I did use what worked for last gen BRZ, 3.3 ohm resistor, and it DID NOT work. Later, I measured the resistance from the airbag circuit using a volt-meter, and it was 0.3 ohm.
    • Has anyone also observed this? I've ordered resistors at that rating, but I am yet to try it.
    • I dropped the resistance to 0.6 ohm by parallel-connecting all 3.3 ohm resistors I had in hand, but it was still not enough to prevent the light from coming on.
    • Besides 0.3 ohm resistors, I also ordered these simulators, since they look clean and neat: https://bradshacks.com/product/airbag-simulator/
  • Occupant sensor: We have this elaborate 4-sensor plug under the passenger seat.
    • FIRST OFF, it doesn't look like a pressure sensor, since it's installed right by the rails. Perhaps rail position sensor? I did not see any other sensor, but might have missed something..
    • Do we need this to keep the light off?
    • For the time being, I keep the OEM seat right by the passenger door and plug this in to eliminate its impact while I experiment on airbag plugs, but I'd really not like to remove all that harness from the OEM seat bottom, if at all possible : )
    • Just ordered this sensor to experiment with it: https://parts.zeiglersubarumerrillvi...4084CC010.html



Feels like it would be so much easier to just change the driver seat!


The occupancy sensor in orange..
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Last edited by X25; 10-31-2022 at 04:13 AM.
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Old 10-31-2022, 03:56 PM   #2
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I am also curious about the occupancy sensor's method of functionality and how it can be dealt with properly.

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Old 10-31-2022, 04:55 PM   #3
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3.3 ohm resistors work fine. Like you said, its way easier to just change the drivers seat.

You're on the right track with the occupancy sensor. I also ordered that same part # hoping its the complete occupancy sensor x4 + harness - Saw on a FB group post that someone took it off their stock seats which required quite a bit of taking apart.
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Old 10-31-2022, 07:43 PM   #4
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Ok here's hoping that harness would be the end of it! Besides the occupancy sensor, the harness also lets you plug in the seat belt plug. I guess you could figure that out without it, but this would make it a clean install. I'll try it out as soon as I receive the part.
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Old 11-06-2022, 12:44 PM   #5
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Quote:
Originally Posted by X25 View Post
Ok here's hoping that harness would be the end of it! Besides the occupancy sensor, the harness also lets you plug in the seat belt plug. I guess you could figure that out without it, but this would make it a clean install. I'll try it out as soon as I receive the part.

FYI

64084CC010 - I was able to order this part at my local dealer. It's actually missing the 4 sensors that are attached to the seat rail (only includes the cabling).
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Old 11-06-2022, 01:06 PM   #6
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Quote:
Originally Posted by jongers View Post
FYI

64084CC010 - I was able to order this part at my local dealer. It's actually missing the 4 sensors that are attached to the seat rail (only includes the cabling).
Shoot, do you know what else needs to be ordered?
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Old 11-06-2022, 11:51 PM   #7
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Anyway, I ran out of patience, and looted my OEM passenger seat for the parts. In short, NO WARNING LIGHTS!




With everything connected, there're no longer any lights!!!


I fixed all the sensors by the race seat's base mount to make sure the sensors are not hurt by harness, etc. They are not very well protected as they are.



All done!!

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Old 11-07-2022, 01:06 AM   #8
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occupancy sensors are LIN bus based. They are actually similar to Load cells. So they measure deflection of the weight on them. No real way to bypass them other than unbolting them and leaving them on the floor lol.

I will be working on a device soon that will be able to connect a different sensor into the system. But that will be later on.
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