I have a 2007 Chevy Colorado I bought the truck a couple months bk. They have bad interior lighting as far as being able to see things at night inside of the cab, For this reason I had trouble knowing if I was pressing the lock or unlock side of the switch. i have the habbit of locking the doors before I get out of the truck by using the switch not the key fob. I noticed that when I pressed lock it would chime twice but would not chime if I pressed unlocked I guess this was a way for the truck to let me know I had pressed lock Instead of unlock. Today I pressed the switch and no chime so I figured I had pressed unlock so I pressed the other side and still no chime. My chime is gone any ideas on what might have caused the lock switch chime to go out. If u have the same truck does yours chime when u press the lock switch to lock your doors with your keys out of ignition before closing the door.