My 2002 jeep grand cherokee laredo 4.0 had an air bag light on, jeep diagnosed it and said it was the front right air bag impact sensor. I removed the battery and all parts to get to it. i changed the sensor, and when i put the battery back in i heard one noise from the electrical system and now have no electrical power at all. I put the old sensor back in and put the battery back in and still no power. Does the entire system need to be reset by jeep?