To disconnect the negative cable from the battery, follow these steps depending on the type of engine. For V6 engines, remove the engine cover, air intake duct, and air filter housing. On 2011 and later models, remove the emission control valve set. For VB engines, remove the throttle body cover and air intake duct. Remove the plastic clips and rubber seal on the left front inner fender well splash shield. Disconnect the air switching valve hoses and unbolt the tube and air switching valve. For 2UZ-FE engines, remove the engine cover, air intake duct, and air filter housing. For 1UR-FE, 3UR-FE, and 3UR-FBE engines, remove the engine cover, air intake duct, and air filter housing. For all models, unscrew the bolt securing each ignition coil/igniter assembly, disconnect the electrical connector, and pull out the assembly. Installation is the reverse of removal.