LEGO NXT Brick using NBC

I am new to NBC programming and am trying to program my Lego NXT Brick to search for and follow a line of black electrical tape that I have on the floor (I have the light sensor in the front and pointing straight down at the ground). As of right now, the light turns on, but the robot just continues to go over the tape without acknowledging it. I also have it set up to stop and turn around if it bumps into a wall, which is working. The only thing that isn't working is acknowledging and following the black tape when the light goes over it. Can anyone take a look at my code and tell me where I am going wrong?

                                          dseg segment
  Switch sword 0
  Volume sword 0
  Level sword 0
  Distance sword 0
dseg ends

thread main
  SetSensorTouch(IN_1)    // touch sensor connected to IN_1
  SetSensorSound(IN_2)    // sound sensor connected to IN_2
  SetSensorLight(IN_3)    // Light Sensor connected to input 3
  SetSensorUltrasonic(IN_4) // Ultrasonic Sensor connected to input 4
  OnFwd(OUT_BC,80)     // move forward

CheckSensor:

  ReadSensor(IN_1,Switch)       // reads current value of sensor (0/1)
  brtst EQ, CheckSensor, Switch // branch to CheckSensor if Switch = 0
                              // i.e., exit the loop when Switch = 1


  OnRev(OUT_BC,40)      // move backward
  wait 500
  OnFwd(OUT_B,20)       // turn
  wait 500

  jmp CheckSound

CheckSound:
  ReadSensor(IN_2, Volume)
  brcmp GT, ExitCheck, Volume, 60

  jmp CheckSound

 ExitCheck:

 OnFwd(OUT_BC,60)

  jmp CheckLight

  CheckLight:
  ReadSensor(IN_3,Level)
  brcmp LT, CheckLight, Level, 60

  ReadSensorUS(IN_4,Distance)
  brcmp LT, EndPoint, Distance, 30

  OnFwd(OUT_C, 10)

  FindPath:
  ReadSensor(IN_3,Level)
  brcmp GTEQ, FindPath, Level, 60

  OnFwd(OUT_BC, 60)

  jmp CheckLight

  EndPoint:

  Off(OUT_BC)

  wait 1500



endt