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Old 09-02-2010, 10:20 AM   #1
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FYI, the reason for the different PNs is that from '02 onward, the seatbelts had pyrotechnic retractors to 'cinch' up the belts if the airbags were deployed. These will not work in earlier cars because the wiring harness is missing and the DME is different.

The early cars used an inertia reel to 'lock' the seatbelts when significant force was applied to the belts (such as the weight of a passenger thrust forward). But, they only 'lock' and don't actually retract to snug the occupant in.

If you tried using the pyro type retractors without the wiring and brain to fire the charge on impact, they would not retain you at all and you go flying into the airbag, dash and windshield before you ran out of excess belt - as in wearing no seatbelt at all.

Cheers!
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1999 Porsche Boxster
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Last edited by Lil bastard; 09-02-2010 at 07:56 PM.
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Old 09-07-2010, 01:27 PM   #2
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Quote:
Originally Posted by Lil bastard
FYI, the reason for the different PNs is that from '02 onward, the seatbelts had pyrotechnic retractors to 'cinch' up the belts if the airbags were deployed. These will not work in earlier cars because the wiring harness is missing and the DME is different.

The early cars used an inertia reel to 'lock' the seatbelts when significant force was applied to the belts (such as the weight of a passenger thrust forward). But, they only 'lock' and don't actually retract to snug the occupant in.

If you tried using the pyro type retractors without the wiring and brain to fire the charge on impact, they would not retain you at all and you go flying into the airbag, dash and windshield before you ran out of excess belt - as in wearing no seatbelt at all.

Cheers!
Hi, when I ordered red seat belts for my 99 I got the later model with the pyro retractors. I asked about this, and was told that this part supersedes the older model and that it would just install without the wiring. When I pull hard on it, it does retain. It just don't have a working retractor to pull you back - so in effect operate like the original one.

Atle
My car and mods: http://986forum.com/forums/showthread.php?t=26067
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