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Topic: Seat belt pre-tensioner (Read 1442 times) |
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Kjetil S
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2001 BMW 520iat
Posts: 1419
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Seat belt pre-tensioner
« on: Sep 20th, 2006, 3:43pm » |
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Hello,
As I finally got the time to try and change my seat frame, I found a problem. How is the seat belt pre-tensioner fastened on the passenger side in a UK car?
On my Norwegian car, it is fastened with one mounting bracket between the outer rear bolt (holding the seat frame to the floor) and the other side is fastened with a bolt or cable tie to a mounting bracket approx on the middle of the side of seat frame.
However, my new "uk style" frame doesn't have the mounting bracket in the middle, and the tensioner doesn't seem to fit very nicely on the seat frame bracket.
Hope what I said was understandable 
(If someone breaking a scorpio would just happen to have a photo of it, it would be much appreciated  )
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Snoopy
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Very old.BAD tempered and missing friends.
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Re: Seat belt pre-tensioner
« Reply #1 on: Sep 20th, 2006, 5:23pm » |
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Same as it is fitted on the Drivers side.... !
See these pictures here
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Kjetil S
Senior Member
2001 BMW 520iat
Posts: 1419
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Re: Seat belt pre-tensioner
« Reply #2 on: Sep 20th, 2006, 5:28pm » |
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TA!
It would seem like the frame on the pictures has the same mounting brackets as my old one, but the new one hasn't. Weird.
The problem is securing the "black box".
The second picture from the bottom show my missing mounting bracket on the right side on the rail between the frame mounting brackets.
On my old frame, this "black box" were supposed to sit between this and the rear mounting bracket.
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Daven
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I'm a cheeky Boy! (Simmos fan club)
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Re: Seat belt pre-tensioner
« Reply #3 on: Sep 20th, 2006, 5:32pm » |
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Snoopy's pictures show the pyrotechnic ones - the manual ones have a unit seperate to the belt clip and is held by the two bolts to the floor by a bracket between the seat and the floor.
Will take a picture and post it in a while in case yours are manual!
Dave
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Daven
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Re: Seat belt pre-tensioner
« Reply #5 on: Sep 20th, 2006, 5:45pm » |
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Yep here you go!
pic 1
pic 2
pic 3
The unit fits under the rear mount on the opposite side of the seat to the belt clip - the cable runs round the frount of the seat - you shold see two clips that hold it in place to a plastic saddle unit.
HTH
Dave
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Kjetil S
Senior Member
2001 BMW 520iat
Posts: 1419
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Re: Seat belt pre-tensioner
« Reply #6 on: Sep 20th, 2006, 5:48pm » |
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You're fast! (Hope that's not what the missus says too  )
Yep, mine is exactly like your pictures.
Any idea how I can fasten a manual version to a frame which used to hold a pyro version? There seems to be tiny differences in the frame brackets.
TA!
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Daven
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Re: Seat belt pre-tensioner
« Reply #7 on: Sep 20th, 2006, 6:05pm » |
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on Sep 20th, 2006, 5:48pm, Kjetil S wrote:You're fast! (Hope that's not what the missus says too }@@{)
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My memory ain't that good
Not sure what you can do! - which end doesn't fit? Do you have the bracket on the spring end (not the clasp end!)
Dave
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Kjetil S
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2001 BMW 520iat
Posts: 1419
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Re: Seat belt pre-tensioner
« Reply #8 on: Sep 20th, 2006, 6:13pm » |
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The bracket which sits between the seat and the floor is there (part of the "black box"), but doesn't fit perfectly (makes it point slighly downwards, enough to push against the floor), the other bracket which is a part of the seat frame is missing, and doesn't seem to have been there.
Wonder if I should bend the bracket on the "black box" slightly, so it would fit on that end, and perhaps cable-tie the other end with some heavy duty's
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Daven
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Re: Seat belt pre-tensioner
« Reply #9 on: Sep 20th, 2006, 6:27pm » |
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Think you should be okay bending the Black box bracket - as long as its held down okay. Not sure about the other end though!
Dave
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Kjetil S
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2001 BMW 520iat
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Re: Seat belt pre-tensioner
« Reply #10 on: Sep 20th, 2006, 6:30pm » |
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TA!
Btw, thanks again for the panel. Even the wires seems to be compatible, although that may be the famous last words
If I can get this to fit, next stop would be to get an electric back frame
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Daven
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Re: Seat belt pre-tensioner
« Reply #11 on: Sep 20th, 2006, 6:40pm » |
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No problems - glad it helped
Dave
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Kjetil S
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2001 BMW 520iat
Posts: 1419
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Re: Seat belt pre-tensioner
« Reply #12 on: Sep 21st, 2006, 6:05pm » |
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Okay, slight problem here. Hooked the new seat frame up to the wiring, turned the ignition on and tried to move the seat with the button panel. Nothing. I see some copper connections on the front of the panel, do these have to be hooked up to something in order to function?
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Daven
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Re: Seat belt pre-tensioner
« Reply #13 on: Sep 21st, 2006, 6:37pm » |
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In a word no!
Just the 3 connectors!
Dave
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Kjetil S
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2001 BMW 520iat
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Re: Seat belt pre-tensioner
« Reply #14 on: Sep 21st, 2006, 6:40pm » |
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Okay.. So one of three then.
1. Non-functional panel (perhaps you can tell more about this, Daven )
2. Non-functional frame (motor/wiring problem)
3. Blown fuse or similar
Perhaps a number 4. Incorrectly hooked up wires... Don't think that was possible, but maybe.
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Daven
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Re: Seat belt pre-tensioner
« Reply #15 on: Sep 21st, 2006, 6:45pm » |
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on Sep 21st, 2006, 6:40pm, Kjetil S wrote:1. Non-functional panel (perhaps you can tell more about this, Daven )
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Be surprised - it came off my old seat that was working fine! 
Get the multi meter out and have a check of the supply, then the switches!
Dave
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Kjetil S
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2001 BMW 520iat
Posts: 1419
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Re: Seat belt pre-tensioner
« Reply #16 on: Sep 21st, 2006, 7:05pm » |
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Hmm.. Tested the wires coming from the car. One large black female connector had a healthy live feed of ~14V with the engine running.
I got nothing from the black and white pair of connectors. The black one showed signs of something when I turned on the heated seat button.
Seems like the fuses are all right.
The rest may be a bit difficult to test without a schematic.
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Kjetil S
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2001 BMW 520iat
Posts: 1419
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Re: Seat belt pre-tensioner
« Reply #17 on: Sep 21st, 2006, 7:20pm » |
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Okay, checked that russian site and found the schematics. It confirms that there is a single connector feeding the motors, and it is the exact same connection on all types of seats, no matter how many motors there are.
So, internal wiring/switches or motors then, but I find it unlikely that ALL motors have gone.
Edit:
Had another look just to verify that all the connections are correct. Everything matches the schematic perfectly, including wire colors (and wire colors are the same on both sides of connectors), so I'm pretty sure it's not that.
Will try and have a closer look tomorrow.
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Kjetil S
Senior Member
2001 BMW 520iat
Posts: 1419
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Re: Seat belt pre-tensioner
« Reply #18 on: Sep 24th, 2006, 12:52pm » |
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Did a test with my multimeter now. I read 12.8V from the car to the button panel, but only 0.1V from the button panel to the motors when I push the corresponding button. 0.0V when I don't.
So far everything points at something wrong with the panel.
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Kjetil S
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2001 BMW 520iat
Posts: 1419
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Re: Seat belt pre-tensioner
« Reply #19 on: Sep 24th, 2006, 5:04pm » |
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Just to make sure I'm not doing something wrong here. Am I correct in assuming that the two wires going to each motor from the button panel is both positive, and that one is for each direction, so I would be able to measure voltage between one and ground when I push the corresponding button?
I tried both this and measuring voltage between the two wires, but couldn't get a reading above 0.1V.
Oh, and measuring between a wire and the positive feed gave me 12.8V until I pushed the corresponding button either way, then it dropped to nothing, so I would guess that the default position to the buttons is ground.
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