Fault code help (yes i searched)

I just pulled codes 45 and 46 out of my 1993 525iA Engine is m50TU

i can't find ANYWHERE what that means. any help?

thought the ECU might be the culprit since i can't find the codes.

here's the ECU pulled. Sticker on the left looks like it might have been replaced by the dealer already.

http://img15.imageshack.us/img15/4387/1001068qd6.jpg

http://img13.imageshack.us/img13/5035/1001067kq3.jpg

SRS 2 - 1991 -1993
Code 45 = Air bag ignition circuit (driver's side) resistance in supply wire too high
Code 46= Seat belt pre-tension system - passenger airbag. Same issue

That sound possible?

Edit: list of codes here among other places: http://www.e38.org/e32/bmw%20code%20defaut.pdf

nvm. stupid bavarian autosport. their code reader has its own interpretation.

45 and 46 are knock sensor 1 and 2