Do not attempt to access or work on the airbag module yourself. Airbag modules contain potentially lethal capacitors that can retain a charge even after the car's battery is disconnected. Improper handling can result in serious injury or death.
The airbag light staying on indicates a problem within the airbag system. This could be a faulty sensor, wiring issue, or a problem with the module itself. You should take your Achieva to a qualified mechanic or an automotive electrician experienced with airbag systems for diagnosis and repair. They have the proper tools, safety procedures, and knowledge to handle this safely and correctly. Attempting to fix it yourself could be extremely dangerous.