bmw makes an aux audio input kit for E46/X5 etc with factory NAV.

is that aux connector standard or proprietary. I want to hook up an delphi XM 's RCA output to the factory system.

bmw makes an aux audio input kit for E46/X5 etc with factory NAV.

is that aux connector standard or proprietary. I want to hook up an delphi XM 's RCA output to the factory system.

It's a standard plug. It's the size of one you'd use on a walkman.