We just bought a used 2007 ex-L. It came with two black keys, a valet key, and a broken fob. The fob still worked bit the back was gone and the battery was taped in. I bought a new case for the fob and switched over the electronics. Now the fob doesn't work and the alarm goes off when I use my key. I can't even drive my new car! Help please! I looked in the manual but can't find a solution.