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Air bag pretensioner bypass help

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5.8K views 5 replies 4 participants last post by  Crumblin'Erb  
#1 ·
I just installed leather seats from a BMW. I had the 60/40 bench before so I only have 4 wires that hook up to the seats. 2 for the seat belt and 2 for the pretensioner.

My question is how can I bypass the pretensioner so it doesn't throw a code or dash light? Is there a resistor I can put in place?

From what I read I can leave the seat belt wires unconnected and it won't throw the seat belt light. I could be wrong on that.

I am not worried about the airbag not going off properly if I bypass the tensioner. That's a risk I'm willing to take.
 
C
#2 ·
If you are referring to the 4 pin connector that connects the seat to the body harness, I don't think the pretension is involved. If there are two black/white, one light green and one black wires, they are for the seat belt buckle switch and for the seat position switch.
 
#3 ·
Yes the seat position switch. But that affects the airbag correct? By not having that installed I am throwing the airbag light. Any way around this?

The seatbelt is ok to leave disconnected. It's a "normally open, held closed" contact on the buckle. Once the seat belt is snapped in place it opens the circuit and the truck sees a person. If you just disconnect those wires it will always think someone is buckled up.
 
#4 ·
From @cart7881 's help I was able to see that a simple resistor in place of the seat position sensor (SPS) should solve the problem.

The service manual states it is a Hall effect sensor that determines the seat position. Either forward or back. That dictates if the airbag deploys all the way (2 stage) or only partially (1stage). For short people it will only deploy to stage 1.

By measuring the voltage change from forward seat position to the rear seat position I can find out what resistor I will need. I want to leave it in the stage 1 position as my wife drives my truck on occasion and she is much shorter then me.

Once I find out what is needed I will update the thread is it could be helpful to anyone trying to swap out for custom seats.
 
#5 ·
Low&slow said:
From @cart7881 's help I was able to see that a simple resistor in place of the seat position sensor (SPS) should solve the problem.

The service manual states it is a Hall effect sensor that determines the seat position. Either forward or back. That dictates if the airbag deploys all the way (2 stage) or only partially (1stage). For short people it will only deploy to stage 1.

By measuring the voltage change from forward seat position to the rear seat position I can find out what resistor I will need. I want to leave it in the stage 1 position as my wife drives my truck on occasion and she is much shorter then me.

Once I find out what is needed I will update the thread is it could be helpful to anyone trying to swap out for custom seats.
Click to expand...
ANY LUCK???
 
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