How to Change the Battery in a 2003 VW Jetta Key Fobby Justin Cupler
Volkswagen released the Jetta in the U.S. in 1979 as an attempt to regain its foothold in one of the world's largest markets. The Jetta offered what American customers were looking for in their compact cars -- four doors and a roomy cabin. Replacing the battery in a 2003 Jetta's keyless entry remote requires careful use of a small screwdriver.
Open the key by pressing the chrome button on the corner of the key fob. Look inside the bed where the key lies when it is closed and find the small gap near the center. Insert a small, flat-head screwdriver into this gap, and twist it to separate the key side of the key fob from the transponder side -- the one with the buttons on it. Pull the key side of the key fob from the transponder side. Pry the backside of the transponder side of the key fob -- the side opposite the buttons -- from the key fob, using the small, flat-head screwdriver, exposing the key fob circuit board and battery. Carefully pry the battery from its bed, using the small, flat-head screwdriver.
Set a new No. 2032 battery on its bed with its marked negative side facing up. Press the battery into its bed until the metal clips secure it in place. Align the backside of the transponder side of the key fob with the button side, then press the two sides together until they snap into place. Line up the key half of the key fob with the transponder half, then slide the two halves together until they click into place. Close the key, then test the key fob.