2006 Cadillac STS-V Owner's Manual - Page 360

Notice: If you connect a negative cable to the 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. Your vehicle has a remote negative (−) ground location, as shown in the illustration. It is located between the battery and the underhood fuse block. You should always use this remote ground location, instead of the terminal on the battery. 5-48