My 1989 190E 2.6L gas/auto has a problem.

The SRS light is on all the time. Even when I reset the battery. How can I check the codes on this system?

I have a small black board near the battery with a button and red LED. There are about 8 holes, some smaller than others. I really havent looked at it very close.

Is it similar to Volvos code tester?

ANy help would be appreciated.

Thanks.