Stealth Tutorial - gameController

i was learning from one of your tutorials: unity stealth 4x: gameController. I have done everything right and there are no errors on my console, but when i hit play and change the position of x, y or z in the script component in gameController, the alarm doesn't go off. i changed the FindChild to just Find as well. Still no luck. I have unity 4.5 i have pasted a copy of the script that i am using below. Could you please have a look. Thank you in advance.

using UnityEngine; using System.Collections;

public class LastPlayerSighting : MonoBehaviour { public Vector3 position = new Vector3(1000f, 1000f, 1000f); public Vector3 resetPosition = new Vector3(1000f, 1000f, 1000f); public float lightHighIntensity = 0.25f; public float lightLowIntensity = 0f; public float fadeSpeed = 7f; public float musicFadeSpeed = 1f;

 private AlarmLight alarm;
 private Light mainLight;
 private AudioSource panicAudio;
 private AudioSource[] sirens;

 void Awake()
 {
     alarm = GameObject.FindGameObjectWithTag(Tags.alarm).GetComponent<AlarmLight>();
     mainLight = GameObject.FindGameObjectWithTag(Tags.mainLight).light;
     panicAudio = transform.Find ("secondaryMusic").audio;
     GameObject[] sirenGameObjects = GameObject.FindGameObjectsWithTag(Tags.siren);
     sirens = new AudioSource[sirenGameObjects.Length];

     for(int i = 0; i < sirens.Length; i++)
     {
         sirens[i] = sirenGameObjects[i].audio;
     }
 }

 void update()
 {
     SwitchAlarms();
     MusicFading();
 }

 void SwitchAlarms()
 {
     alarm.alarmOn = (position != resetPosition);

     float newIntensity;

     if(position != resetPosition)
     {
         newIntensity = lightLowIntensity;
     }
     else
     {
         newIntensity = lightHighIntensity;
     }

     mainLight.intensity = Mathf.Lerp (mainLight.intensity, newIntensity, fadeSpeed * Time.deltaTime);

     for(int i = 0; i < sirens.Length; i++)
     {
         if(position != resetPosition && !sirens[i].isPlaying)
         {
             sirens[i].Play();
         }
         else if(position == resetPosition)
         {
             sirens[i].Stop();
         }
     }
 }

 void MusicFading()
 {
     if(position != resetPosition)
     {
         audio.volume = Mathf.Lerp(audio.volume, 0f, musicFadeSpeed * Time.deltaTime);
         panicAudio.volume = Mathf.Lerp(panicAudio.volume, 0.8f, musicFadeSpeed * Time.deltaTime);
     }
     else
     {
         audio.volume = Mathf.Lerp(audio.volume, 0.8f, musicFadeSpeed * Time.deltaTime);
         panicAudio.volume = Mathf.Lerp(panicAudio.volume, 0f, musicFadeSpeed * Time.deltaTime);
     }
 }

}