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      10-06-2012, 08:55 AM   #22
Lieutenant General

Drives: E90 & Z4 Coupe
Join Date: May 2012
Location: MARLAND

iTrader: (0)

Originally Posted by DBU View Post
You paid how much for your car and didn't know about the active head restraint system? seriously, glad you are ok.

I am 99% sure the active head restraint as well as the belt tensioner are one-time use and needs to be re-charged after they have saved your body from more serious damage. I believe they are powered by CO2 cartridges that are fired electronically when so ordered by the crash sensors/computer. The cost to replace the cartridges will be part of your dealer's repair estimate. No worries, mate.

I have no idea really, but the kid's insurance company is probably looking at a 5-7 grand bill. Would be interesting to learn the cost in due course.
The belt tensioner is a pyrotechnic device, not CO2.