Just got a set of front seats to replace mine from the same year and model 92 Volvo 960 wagon.

The seats i just got have a different seat belt part on the sides part 3521834 Pretensioner. What does this do my original seats don't have this just the seat belt buckle.
I think the car i got them of must have been a private import.

Is it safe to use these or will i have to pull them apart and move the trim and foam across to my old seats.?

Dear volvo426,

Hope you're well. Volvo VADIS - a superseded dealer parts/service database - shows that 92 960s came with seatbelts that included a pyrotechnic pretensioner. When the SRS sensor detects collision energy, it triggers the pretensioners, to take-up slack in the belt a few milliseconds later. This keeps the seat occupant secure.

The seatbelt unit (with the pretensioner) is mounted at the base of the "B" column (between the front and rear seats). The belt is behind the "B" column cover and exits the cover about a foot below the roof.

When seats are removed, the seatbelt unit (with pyrotechnic pretensioner) stays with the donor car. Only the seatbelt receiver - mounted to the seat frame, next to the emergency brake console - comes with the seat from the donor car.

If the donor car did not have a pyrotechnic pretensioner, it was not a 1992 model, but a 1991 (or earlier model).

In short, I do not understand why the seat swap should involve the seatbelt units. I've installed 960/S/V90 seats in 940 cars. The seat belts were never an issue, as the seatbelt receivers interchanged.

As to station wagons, rear seats do not interchange as between 1992 and later cars. But the seatbelt units for the front seats should not affect a seat swap.

If a seatbelt unit without the pretensioner is installed in a car that is equipped with the pretensioners, the SRS system light will come on. The sensor is programmed to expect the presence of the pretensioners. If they are not present, the system will treat their absence as a malfunction. In most states, a car with an SRS light that is "on" will not pass inspection.

Hope this helps.

Yours faithfully,

Spook

Thanks Spook can you have a look at this part in google imaging volvo 3521834 it is on the new seats i got.

It goes on the seat next to the hand brake and combines the seat belt stalk. My old seats just have the seat belt stalk. Can i just put in these new seats.
Thanks

Dear volvo426,

Hope you're well. If there's a site with a picture of the part, please post the link to that site or post a photo of the part you have.

I googled "Volvo 3521834" but found no photos of the part on the first two pages of results.

Hope this helps. Happy Holidays!!!!

Yours faithfully,

Spook

Hi Spook here is a link to the part i am talking about.My original seats just have the seat buckle not this strange looking set up combined with the buckle.

https://www.bildelsbasen.se/?link=item&searchmode=3&query=3525094&post_id=32979208

Dear Volvo426,

Hope you're well and Happy Holidays!! Thank you for the link. The part shown was not, so near as I know, used on 92 or later 940s sold in North American markets.

Presuming you still have the factory-original seats, remove from those seats the seatbelt receiver (the part into which the chromed locking piece is inserted).

On the donor car's lower seat frames - to which part #3521834 is mounted - see if there's a threaded hole, of a size to accept the bolt that secured the seatbelt receiver to the factory-original seat.

If so, use the factory-supplied seatbelt receiver mounting bolts to secure the factory-original seat belt receivers to the replacement seats from the donor car.

Note: if the factory-original bolts cannot be used, be sure to use at least a Class 10.9 metric bolt. This bolt is mission-critical. If it snaps, the seatbelt fails entirely!!!

If there's no threaded bolt hole, you'll need to drill and to tap such a hole. If you cannot do this, find a mechanic who has the correct drill bit and taps. Once the hole has been drilled and tapped, installed the seatbelt receiver bolt. If SAE bolts are to be used - if metric bolts cannot be had in your locale - a Grade 8 bolt should be used.

Hope this helps.

Yours faithfully,

Spook