Help with BMW Z4 Airbag Light

I have a 2003 BMW Z4, while driving the airbag light on the panel came on and the “off” light next to the gear shift lever came on. had code checked and result was: 93E3 Passenger Air Bag Switch, also 93E7 under voltage. checked with BMW dealers in area and got these prices to replace the seat sensor mat on passenger side. $850.00 another dealer wanted $800.00 and another wanted $650.00. I chose the $650.00l and as usual any part replace and installed by BMW comes with a 2 year warranty…