SRS light on my 04 CR-V has been on and I had my mechanic pull a code. He got 21-1 for driver side seat belt tensioner. I obtained a used tensioner, which appears to be in very good shape. I installed the used tensioner, but the SRS is staying on. I've successfully installed tensioners in this car before, and I'm pretty sure I got this one in correctly. Could it be that the SRS light needs to be reset? Any feedback is greatly appreciated. Thanks.