A proximity switch assembly and a method for detecting the activation of a proximity switch assembly and tuning the assembly. The assembly comprises proximity switches, each of which comprises a proximity sensor that provides a sensing activation field and a control circuit to process the activation field for sensing activation. The tuning method includes generating an activation field with a proximity sensor, generating a signal in response to the activation field, detecting the signal associated with noise, and the adjusting parameters based on detected noises, wherein the parameters are used for the detection of a proximity state, for example, the activation of the proximity switch.