HELP - air bag light in conjuction with AC/heat
 

When I turn on AC/heat in my 2002 Saab 9-5 2.3t; the air bag light warning comes on. When I turn the car off and start it again, it goes away. If I keep the AC/heat off, the light never comes on. Soon as I turn it on, air bag light comes back. Sometimes it will go away for 1-2 seconds but come right back on. It doesn't matter how long or short I drive, same symptoms.