In case of battery disconnection, a number of systems will require to be re-learned before they can perform normally. Depending on the model the vacuum pump is either on the front side of the transaxle or the rear. Start by removing the cable on the negative battery. In the case of a model that has the vacuum pump at the front, remove the engine cover. In the case of someone having a vacuum pump at the rear, lift the front of the car up to a certain level and then place it safely on jackstands and then take the shield off the above left driveaxle. Then, detach the vacuum line of the pump. Unplug the electrical connector of the vacuum pump and the electrical connector of the harness, and lay the harness aside. Unscrew the mounting bracket of the vacuum pump that has retaining bolts, and screw out the pump and the bracket as one. Install the pump to the bracket by removing the vacuum pump-to-bracket retaining fasteners. The opposite of removal is installation.