In the automotive world, the term "remote control" generally applies to a remote starter; however, it may also refer to a keyless remote (sometimes known as a key fob). If your Pontiac vehicle is equipped with a remote starter, it is within the keyless remote device. The device uses a single battery to unlock the doors and remotely start the engine.
Insert a small knife or thin flat-head screwdriver between the remote halves, directly underneath the slot for your key ring.
Pry the remote halves apart carefully. Set them down on a table, and then remove the old battery from the remote.
Insert the new battery, with the "positive" symbol facing up. Align the remote halves and press them together to snap the remote back together.