Usually close to the drier in the tube on the low pressure side. Drier looks like an aluminum cylinder about as big around as a soda can and twice as tall with two aluminum tubes coming out of it. The port has a screw off cap to access.
check the suction line of the compressor for port -check on the back of the compressor. Before recharging check for leaks as it not necessary to recharge a system that has no leaks.
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Sounds like it could be a faulty airbag module.You will need to have a scan tool to verify what the trouble is.The light will not turn off until the problem is fixed.