How to change the zoom in a certain location in google maps api v3?

I'm trying to get the map to zoom in on a particular markers location when they are created in Firebase.

I already tried to use the

setZoom()
setCenter()

but what happens is this:

I'dlikeittobeontopofthecorrectlocation,forexample:IthasaMarkersfromBarraShopping,itgoesstraighttotheshoppingmall.

WhatItriedwasthefollowing:

GM.js

functioninitMap(){varmap;map=newgoogle.maps.Map(document.getElementById('map'),{center:{lat:-1.000,lng:62.000},mapTypeId:'hybrid',zoom:2,zoomControl:true,zoomControlOptions:{position:google.maps.ControlPosition.RIGHT_CENTER},streetViewControl:false,rotateControl:false,fullscreenControl:false,styles:[{"featureType": "administrative",
          "elementType": "geometry",
          "stylers": [
            {
              "visibility": "off"
            }
          ]
        },
        {
          "featureType": "poi",
          "stylers": [
            {
              "visibility": "off"
            }
          ]
        },
        {
          "featureType": "road",
          "elementType": "labels.icon",
          "stylers": [
            {
              "visibility": "off"
            }
          ]
        },
        {
          "featureType": "transit",
          "stylers": [
            {
              "visibility": "off"
            }
          ]
        }
      ]
  });
  generateMarkerDBS();
  searchAllMarkers(map);

}

firebase.js

function searchAllMarkers(map){
    var locations = firebase.database().ref('/').child('aliansce');

    locations.on('value', function(keysSnapshot){

        // SE CONTER LOCAIS DA COMPANIA
        // IRÁ MOSTRAR OS MAKERS NO MAPA
        if(keysSnapshot.numChildren() > 0){
            locations.on('child_added', function(keysSnapshot){
                var markersCoordinatesNodes = firebase.database().ref('/aliansce/').child('' + keysSnapshot.key + '/marker/markerCoordinates/');
                markersCoordinatesNodes.on('value', function(coordinatesSnapshot){
                    if((coordinatesSnapshot.val().lat == null) && (coordinatesSnapshot.val().lng == null)){
                        alert("LAT ou LNG NULL's no DATABASE!!");
                    } else {
                        var markersDateNodes = firebase.database().ref('/aliansce/'+ keysSnapshot.key + '/marker/markerDateCreate/').child('dateDescription');
                        markersDateNodes.on('value', function(dateSnapshot){
                            var infowindow = [];
                            var arrMarkers = [];
                            var arrMarkers = new google.maps.Marker({
                                position: new google.maps.LatLng(coordinatesSnapshot.val().lat,coordinatesSnapshot.val().lng),
                                map: map,
                                title: keysSnapshot.key
                            });
                            map.setZoom(15);
                            map.panTo(arrMarkers.position);
                            arrMarkers.infowindow = new google.maps.InfoWindow({
                                position: new google.maps.LatLng(coordinatesSnapshot.val().lat,coordinatesSnapshot.val().lng),
                                content: 
                                '<div><strong>'+ keysSnapshot.key +'</strong><br></div>'+
                                '<div>'+ dateSnapshot.val() +'</div>',
                            });
                            arrMarkers.infowindow.open(map,arrMarkers);
                            arrMarkers.addListener('click', function(event,infowindow){
                                this.infowindow.open(map,arrMarkers);
                            });

                        });
                    }
                });
            });
        } else {
            alert("NÃO CONTÉM LOCAIS DA COMPANIA NO DATABASE");
        }
    });
}