Fixing Slow to Retract Seatbelts
Winching
Joined: Oct 2012
Posts: 676
Likes: 43
In a 2009, the seat belts would be 8 years old. They probably have a date marked on them. I wouldn't replace them yet either, but those things won't be good forever.
If I understand right, the DII had pyrotechnic pre-tensioners (there's another recent thread where someone's misfired). I do not know if the LR3 has pre-tensioners or if it has active seat belts. Active belts use an electrical pretensioner that works with the pre-crash ECU. They can pre-tension and release, unlike the pyrotechnic pretensioners which are one-time-use.
My D1 uses Autoliv seatbelts. I figure LR kept the same vendor. ZF/TRW is the other popular vendor. https://www.autoliv.com/ProductsAndI...Seatbelts.aspx
Whether the LR3 has one-time pyrotechnic pretensioners or electric active belts, they can also have load limiters which are torsion bars that give a little to limit chest loads. All of those things are not reliable on an indefinite basis. They wear and degrade with age.
It's an expensive price to pay for safety with comfort. The safety is no doubt worth it, but I think the comfort is overrated. A manual harness doesn't need retractors, distributes chest load better so it doesn't need load limiters, and it doesn't need a complex interface with an ecu. But with a harness, a soccer mom can't turn around in her chair to swat the kids in the back seat, and it will probably wrinkle a linen suit.
If I understand right, the DII had pyrotechnic pre-tensioners (there's another recent thread where someone's misfired). I do not know if the LR3 has pre-tensioners or if it has active seat belts. Active belts use an electrical pretensioner that works with the pre-crash ECU. They can pre-tension and release, unlike the pyrotechnic pretensioners which are one-time-use.
My D1 uses Autoliv seatbelts. I figure LR kept the same vendor. ZF/TRW is the other popular vendor. https://www.autoliv.com/ProductsAndI...Seatbelts.aspx
Whether the LR3 has one-time pyrotechnic pretensioners or electric active belts, they can also have load limiters which are torsion bars that give a little to limit chest loads. All of those things are not reliable on an indefinite basis. They wear and degrade with age.
It's an expensive price to pay for safety with comfort. The safety is no doubt worth it, but I think the comfort is overrated. A manual harness doesn't need retractors, distributes chest load better so it doesn't need load limiters, and it doesn't need a complex interface with an ecu. But with a harness, a soccer mom can't turn around in her chair to swat the kids in the back seat, and it will probably wrinkle a linen suit.
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