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On 4 door E9x, drivers side heat is turned on by the bus by a seat module under the drivers seat. Passenger side heat is turned on by a junction box via a relay under the pass seat. You may need to run 2 new wires. Check the yellow pass side connector under the seat. Pin 1 and 5 are needed to turn on the heat. Also check that all the thick wires line up between your car harness and the new seats.
Your airbag light is on because the car got turned on with the yellow connector disconnected. The buckles are hooked into the airbag system. It can be reset with anything that can reset codes.
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