To disconnect and connect the battery negative cable, first, make sure all lamps and accessories are switched off and the Ignition Switch is off. Remove the negative cable of the battery from the battery. Before reconnected clean the exist oxidation at the contact face at battery terminal and Battery Cable using a wire brush. Then, attach the battery negative cable onto the battery and secure the battery negative terminal bolt at 16 n.m (12 lb ft). Safety precautions are extremely important because the vehicle's supplemental inflatable restraint (SIR) system has the potential to cause a deployment of air bag and personal injury or unnecessary repairs. Always also remove sir system before serving its components or wiring and checking that the ignition key is off and all the electrical loads off when working at any electrical component. If there is any risk of personal contact of a live exposed electrical terminal, remove negative Battery Cable to prevent injuries or damages.