Cadillac 2010 CTS Sport Sedan Owner's Manual page 407

A. Heavy, Unpainted Metal Engine
Part or Remote Negative ( )
Terminal
B. Good Battery or Remote
Positive (+) and Remote
Negative ( ) Terminals
C. Dead Battery or Remote
Positive (+) Terminal
To disconnect the jumper cables
from both vehicles, do the following:
1. Disconnect the black
negative ( ) cable from the
vehicle that had the dead
battery.
2. Disconnect the black
negative ( ) cable from the
vehicle with the good battery.
3. Disconnect the red positive (+)
cable from the vehicle with the
good battery.
4. Disconnect the red positive (+)
cable from the other vehicle.