Location.href is not transferring from page in ASP.NET MVC

I'm doing a login screen in ASP.NET MVC. The framework makes all processes complete without errors: go to the database, query the login and return with an OK (user exists, I can authenticate). When the flow returns from the bank and passes through if (dados.OK) , it has to throw me to another page, but this is not happening: simply the browser runs the code and does not throw me to the other page ( _ViewStart )

What can it be? A better way? Tips?

$(document).ready(function () {
$("#status").hide();
$("#btLogar").click(function () {
    $.ajax({
        data: { Login: $("#txtLogin").val(), Senha: $("#txtSenha").val() },
        dataType: "json",
        type: "GET",
        url: "/Login/AutenticarLogin",
        async: true,
        beforeSend: function () {
            $("#status").html("Estamos autenticando o usuário... Só um instante.");
            $("#status").show();
        },
        success: function (dados) {
            if (dados.OK) {
                $("#status").html(dados.Mensagem)
                setTimeout(function () { window.location.href = "_ViewStart" }, 5000);
                alert("logado");
                $("#status").show();
            }
            else {
                $("#status").html(dados.Mensagem);
                $("#status").show();
            }
        },
        error: function () {
            $("#status").html(dados.Mensagem);
            $("#status").show()
        }
    });
});