Remote Control Key Buttons Operate Incorrectly After Coding. The remote control buttons operate incorrectly after programming and coding using ISTA/P 2.47.x. or later. * Vehicles without option 302 (Alarm System): the 3rd button unlocks the entire vehicle instead of just opening the trunk. * Vehicles with option 302 (Alarm System): the 4th button panic mode siren does not work; the entire vehicle unlocks. CAUSE Front Electronic Module (FEM) coding error