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01-04-2014, 02:49 PM | #1 |
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Seat Belt Tensioner Wiring Question
Does it matter what order the two wires are in when putting them back in the yellow wiring harness plug? I tried to keep track of the two and one of the pieces of tape I used to mark, came off. Thanks!
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01-04-2014, 03:41 PM | #2 |
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Looking at the schematic, it matters.
Since you did not specify which side, I will start on the left: From the left b-piller satellite, the two wires leave on pins 14 and 15. Pin 14 goes to the X275 connector (yellow one underseat) on pin nine (9) and it is RED (RT). Pin nine outputs to pin 2 on seat belt tensioner. Pin 15 goes to the X275 connector on pin 10 Blue/Brown (BL/BR). Pin 10 outputs to pin one (1) on the seat belt tensioner. This is the same for the right side. |
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01-05-2014, 07:21 PM | #3 | |
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Also, it's for both sides. I removed the seat belt tensioners from both yellow plugs, so just trying to figure out how to get it all back together. Thanks for the schematics, that should help in the hunt. Last edited by ANUSTART; 01-05-2014 at 07:42 PM.. |
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01-06-2014, 12:23 AM | #4 |
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So, referencing X275-X279.pdf, you pulled the wires from G12/13 to pins 1 and 2 of X10216/17, and they're all Black?
I'm fuzzy on what's "Generator, seat belt tensioner". Obviously it torques the seat belt when high Gs are detected, but I don't know if it's a motor or a solenoid that releases spring tension. It's not drawn as either. It's drawn as a resistor (or at least a resistive load) with some mystery box in series with it. Seems like an odd place for the mystery box to be a fuse. Do you have access to a multimeter? The next thing I would do is measure the resistance and do a diode check in both directions to see if it's asymmetrical.
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01-06-2014, 05:04 AM | #5 |
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The 'seat belt tensioner' does exactly what it says it does. When the proper conditions are met, the pyro charge is enabled and draws the seat belt tight over the seat occupant.
I would be VERY, VERY hesitant putting an ohm meter on that portion of the circuit. You might just fire the damn thing off…. |
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01-06-2014, 12:08 PM | #6 | |
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Here's the part… http://www.ecstuning.com/BMW-Z4-2.5i...Belt/ES143412/ Last edited by ANUSTART; 01-06-2014 at 01:02 PM.. |
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01-06-2014, 02:32 PM | #7 |
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That was my other thought. Wasn't sure if it was a one-shot pyro.
In that case, it probably doesn't matter what polarity it's driven in, which is why both wires are black and it's drawn schematically as a resistor.
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01-06-2014, 03:24 PM | #8 |
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For the yellow connector (X275/X279) pinout, look at the center of the PDF for Z4 Passenger Seat.PDF..
That has the pin locations on that connector. |
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01-06-2014, 03:30 PM | #9 |
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Why not do this:
Disconnect the battery, now disconnect the cable from the seat belt tensioner on the other side of the car, then disconnect the X275/X279 connector. Now that the circuit is safe, ohm out that cable for proper pin placement. According to the schematics, they are wired the same.... |
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01-06-2014, 09:45 PM | #10 | |
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Below are a couple photos that may better illustrate where I am with this. If I'm misunderstanding let me know. If that is the case, would be great. Just want to make sure that's correct before getting it all back together. If it is, sure makes all this much easier. |
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01-07-2014, 12:31 AM | #11 |
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It almost has to be a thermal igniter, like a flash bulb.
All it needs is for current to flow through it, overheat it, and ignite the charge. Doesn't matter which direction the current flows. Especially since it's a safety feature, if it mattered they would make darn sure it got wired correctly. Not only would the wires be marked differently, but the pins would probably be different, like opposite genders, so even if you were color-blind you couldn't wire it wrong.
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01-07-2014, 11:15 AM | #12 | |
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01-08-2014, 04:13 PM | #13 |
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If you installed seats where the tensioner had already fired (not uncommon for seats pulled from an accident car), that will light the airbag warning. You can tell if they have fired by comparing the length of the plastic 'accordion' leading to the buckle - it is compressed and considerably shorter than on a new one. New ones are around 80 bucks online, IIRC, and very simple to install (one bolt).
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01-08-2014, 04:40 PM | #14 | |
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Just to make sure there is no ambiguity, when/if you put your old seats back in the car, you will have to have the air bag light reset. It will not reset on its own. |
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