Can anybody tell me if there is a formula to reset the airbag light on my wife's 2008 B Class SE diesel please. Having skidded on ice and careered into a wall it resulted in the steering wheel airbag and drivers seatbelt deploying.

I have replaced the airbag, seatbelt and airbag module, however, the red SRS light and the message centre are activated and need resetting. Can anybody kindly help me find a way to reset this or will I need to send it off to the main dealer for rectification. Many thanks.