I take it the new steering wheel boss hasn't get a horn button then. You'll have to wire up a separate switch if it hasn't. The correct way would be to fit a resistor of the same value as the airbag. This would then turn off the light. Other ppl just remove the bulb. DO NOT use a multimeter to check the airbag resistance, it WILL go off. Someone here may know the correct value if they've measured it with a safety ohmmeter.