It is always a hit or miss on if I am able to open the rear trunk on my 2003 Forester with my remote entry. With all the doors locked, when I press the blue unlock/disarm button once, it opens the driver's side door. Pressing the same button another time, opens the other 3 doors. What do I need to do to open the rear trunk? I find myself standing by my car pressing the unlock button, sometimes up to 12 times before the rear trunk opens. What am I doing wrong? I have been dealing with this for 6 years and have had it!