To perform horn relay servicing, first disconnect the battery negative cable, isolate it and wait two minutes to allow the capacitor to discharge in the air bag system. This is the only effective procedure available to prevent accidental deployment of the air bag. To start, take off the fuse access panel, grab the horn relay, and pull it straight out of the relay center. To install, insert the new horn relay into the proper receptacle in the relay centre, and push it in firmly with the terminals fully seated. Once you have secured the relay, replace the cover on the fuse access and reconnect the battery negative cable.