Cadillac 2004 CTS - Manual (Page 95)

Shift Lock Release
(Automatic Transmission)
If your vehicle has a dead battery or a battery with low
voltage, you can still shift the vehicle into PARK (P) and
remove the ignition key. Use the following procedure to
release the shift lever:
1. Pull up on the rear part of the leather boot that
surrounds the shift lever.
2. Fold the boot upward to expose the mechanism
beneath the shift lever.
3. Locate and remove the small oval cap near the
forward, right side of the shifter mechanism.
2-29