Cadillac 2010 STS Owner's Manual page 398

Your vehicle has a remote negative ( ) ground
location, as shown in the illustration. It is located
on the passenger side front shock tower. See
Engine Compartment Overview on page 6 13.
You should always use this remote ground
location, instead of the terminal on the battery.
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Notice: If you connect a negative cable to the
Engine Control Module (ECM), ECM mounting
bracket, or any cables that attach to the ECM
bracket, you may damage the ECM. Always attach
the negative cable to your vehicle's remote negative
ground location, instead of the ECM, ECM bracket,
or any cables attached to the ECM bracket.
WARNING:
An electric fan can start up even when the engine
is not running and can injure you. Keep hands,
clothing and tools away from any underhood
electric fan.