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  BMW Forums » BMW discussion forums » BMW Z-Series
  How to make an airbag simulator?

 How to make an airbag simulator?



I need to remove the passenger seat on my M Coupe for a few days while I figure out how to remove enough trim to pull the carpet away from the rear firewall to keep the dealership from having to cut the carpeting when they replace the fuel level sender in the tank.

I will have to drive up to the dealership like this.

I don't want to set off the Airbag Warning Light.

Does anyone have the schematic for the little module to plug into the seat harness to keep the airbag light from coming on?

Or if someone has one they don't need and would like a few bucks for, that works too .

Thanks!
   Reply » How to make an airbag simulator?

That system seems to be really touchy. It's easy to trigger the airbag light. IMHO it's going to be hard to trick the system correctly.

Why not just let the light come on and then reset it after it's back together?

   Reply » How to make an airbag simulator?

I could, but I thought I'd try to avoid that.

I know there's a not too terribly complicated part that can be made to trick it. I've seen it done on a few Z3's.

   Reply » How to make an airbag simulator?

"The passenger seat in the Z3 has a mat pressure sensor which acts like a variable resistor when someone sits on it. When more pressure is applied to the mat sensor, it sends a message to the airbag control module. In the event of an accident, the airbag will be deployed at a rate based on the weight of the occupant. There is no mat sensor on the driver side. BMW must assume that the driver is over 80lbs.

If you wish to defeat BMW's tricky airbag system, then you must remove the mat sensor and replace it with a circuit that makes the airbag control module "think" someone is not present. There are diagrams out there. Basically two resistors and a diode. For liability reasons, I do not recommend this modification or suggest anyone complete this modification."


I believe this is the schematic...

Edit: "The circuit fools the SRS system to think the passenger pressure mat is there, but it is unoccupied."

   Reply » How to make an airbag simulator?

Thanks very much! Where did you get the text?

Can anyone who's done this confirm?

   Reply » How to make an airbag simulator?

Quote:
Thanks very much! Where did you get the text?

Can anyone who's done this confirm?

I got it off Bimmerforums. Seems legit to me based on what I've read.


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