2003 GMC Envoy Owner's Manual - Page 338

Notice: Ignoring these steps could result in costly damage to your vehicle that wouldn't be covered by your warranty. Trying to start your vehicle by pushing or pulling it won't work, and it could damage your vehicle. 1. Check the other vehicle. It must have a 12-volt battery with a negative ground system. Notice: If you leave your radio on, it could be badly damaged. The repairs wouldn't be covered by your warranty. 3. Turn off the ignition on both vehicles. Unplug unnecessary accessories plugged into the cigarette lighter or accessory power outlets (if equipped). Turn off the radio and all lamps that aren't needed. This will avoid sparks and help to save both batteries. And it could save your radio! Notice: If the other system isn't a 12-volt system with a negative ground, both vehicles can be damaged. 2. Get the vehicles close enough so the jumper cables can reach, but be sure the vehicles aren't touching each other. If they are, it could cause a ground connection you don't want. You wouldn't be able to start your vehicle, and the bad grounding could damage the electrical systems. To avoid the possibility of the vehicles rolling, set the parking brake firmly on both vehicles involved in the jump start procedure. Put an automatic transmission in PARK (P) or a manual transmission in NEUTRAL before setting the parking brake. If you have a four-wheel-drive vehicle, be sure the transfer case is not in NEUTRAL. 4. Open both hoods and locate the batteries. Find the positive (+) and negative (-) terminals on each battery. Your vehicle has a remote negative (-) jump starting terminal. You should always use this remote terminal instead of the terminal on the battery. The remote negative (-) terminal is located on the front engine lift bracket and is marked "GND." See Engine Compartment Overview on page 5-12 for more information on location. 5-43