Chrysler 2006 PT Cruiser Sedan - Manual (Page 30)

Battery Replacement
The recommended replacement battery is CR2032.
1. If the key fob is equipped with a screw, remove the
screw. With the transmitter buttons facing down, use a
flat blade to pry the two halves of the transmitter apart.
Make sure not to damage the elastomer seal during
removal.
2. Remove and replace the batteries. Avoid touching the
new batteries with your fingers. Skin oils may cause
battery deterioration. If you touch a battery, clean it with
rubbing alcohol.
3. To assemble the transmitter case, snap the two halves
together.
NOTE: If the key fob is equipped with a screw, reinstall
and tighten the screw until snug.
Separating Transmitter Halves
30 THINGS TO KNOW BEFORE STARTING YOUR VEHICLE