Air Bag Light, Diagnosis and Repair - write up

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Just corrected my flashing airbag light on 2000 470. This thread saved the day.

Got codes from using wire in engine fuse box and counting flashes.

Couldn't get any ohm reading on tensioner (read 0.0). Didn't need to remove seat btw.

Sent into the Safety company, mentioned here, anyway, quick turnaround. My mechanic was impressed with cost and time.

Installed refurbished tension. No more light, and better chance airbag/ belts work if needed.
 
@Cosmo Kramer , thanks for this thread--Our 1999 JDM's airbag light just started flashing. I didn't feel like jumpering and counting flashes, so I thought I'd see if Techstream would work--it did. Pulled up a B0131 code.
Now I'm researching that in the FSM--the first thing it says is DO NOT test resistance of the pretensioner (page IN-14 in my 1999 FSM), and a little research indicates there's some (probably very very small, since nearly everyone seems to do it) risk using a multimeter to measure resistance, so I just put a brake light in the circuit (thanks @DCTLC1) and the error code went away, confirmed with techstream (showed in history but not current).

So now I just need to figure out when we can live without a driver’s side seatbelt for a week!!

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