Cadillac CTS Owner's Manual page 378

Notice: If you leave your radio or other
accessories on during the jump starting
procedure, they could be damaged. The repairs
would not be covered by your warranty. Always
turn off your radio and other accessories when
jump starting your vehicle.
3. Turn off the ignition on both vehicles. Unplug
unnecessary accessories plugged into the
cigarette lighter or the accessory power
outlets. Turn off the radio and all lamps that
are not needed. This will avoid sparks
and help save both batteries. And it could
save the radio!
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4. Open the hoods and locate the positive (+)
and negative ( ) terminal locations of the
other vehicle, as well as the positive (+)
terminal location on your vehicle's battery.
See Engine Compartment Overview on
page 342 for more information on the location
of the battery.