Cadillac 2008 CTS - Manual (Page 328)

Your vehicle has a remote negative (
−
) ground
location, as shown in the illustration. It is located on
the rear passenger side of the vehicle. See
Engine Compartment Overview on page 5-14. You
should always use this remote ground location,
instead of the terminal on the battery.
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.
{ CAUTION:
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.
5-46