If you have received a CalAmp K-12 test kit, you can use it to test your hardware to troubleshoot issues prior to performing an RMA. To use your test kit to check whether an LMU-3641 or LMU-4233 has power, GPS connectivity, input/output functionality, and AUX connectivity, follow these steps:


  1. Make sure that the magnetic antenna is outside, is pointing up, and has a clear view of the sky.
    Note: Use a known working antenna for testing purposes.

    If testing outside isn't possible, place the antenna close to a window.
  2. Connect the antenna to the LMU (attaching to the GPS and COMM connectors).
      
  3. Power the testing device via the accessory socket (the cigarette lighter socket) in the vehicle; vehicle battery (connecting the adapter cable's black clamp to the battery's negative terminal and the red clamp to the battery's positive terminal); or kit battery (making sure to flip the switch on the kit battery to the On position).
    Note: If you are using the test kit battery, connect it to the testing device via the red cable to the black knob. The test kit battery will arrive with a partial charge; you can charge it if needed.

  4. Physically attach the LMU to the testing device.
     
    If you are testing an LMU-3641, attach it using the clips on the side.
     
    If you are testing an LMU-4233, attach it on the top of the device.
     
  5. Connect the power harness to the LMU and to the testing device.
      
  6. Test the LMU's ability to power on as follows:
     
    1. Press the Battery switch.
       
    2. Press the Ignition switch.
       
    3. Check the LMU's LEDs.
       
      If the LEDs power up and begin blinking, the LMU can successfully power on.
       
      If the LEDs do NOT light up, first make sure that you have correctly provided power to the testing device and to the LMU. If that is not the issue, you can submit an RMA as shown in Returning Hardware and Obtaining a Replacement (Performing an RMA).
       
  7. Test the LMU's ability to send GPS messages to the CalAmp K-12 site by following these steps:
     
    1. After performing step 6, observe the LEDs for the next five minutes.
       
    2. Verify that they run through this process, in this order:
       
      COMM LED (Orange)
      		Condition
      Off
      		Modem off
      Slow blinking
      		COMM is on and is searching for a tower
      Fast blinking
      		Network available (connected to a tower)
      Alternates from fast to slow blinking every 1 second
      		Registered but hasn't received acknowledgment from the CalAmp K-12 server yet
      Solid
      		Registered and received inbound acknowledgment from the CalAmp K-12 server

       
      GPS LED (Green)
      		Condition
      Off
      		GPS off
      Slow blinking
      		GPS on
      Fast blinking
      		GPS is on and searching for satellites
      Solid
      		GPS fix — the GPS location has been acquired with the minimum required number of satellites

    3. In CalAmp K-12, go to the Fleet Tracking screen and verify that you can see the LMU's associated vehicle at your current location (see Tracking a Vehicle if needed).
       
      If both LEDs go through this process and reach a solid state, and you can see the vehicle on the Fleet Tracking screen, the LMU can successfully connect to GPS.
       
      If the green LED does not reach a solid state, make sure that you have a decent line of sight to satellites and are using a working antenna.
       
      If the orange LED does not reach a solid state but settles on alternating between fast and slow blinking, COMM is connected, but there may be an issue with the CalAmp K-12 server or the quality of the signal.
       
      If these are not the issue, you can submit an RMA for the LMU as shown in Returning Hardware and Obtaining a Replacement (Performing an RMA).
       
  8. Test the LMU's input/output functionality as follows:
      
    1. Press the Input 1 switch to the On position.
       
    2. Wait five seconds.
       
    3. In CalAmp K-12, navigate to the Fleet Tracking screen and verify you can see that the input has been registered as an event, such as Stop Arm Open or Amber Lights On (see Tracking a Vehicle if needed).
       
    4. Switch Input 1 back to the Off position.
       
    5. Repeat steps a through d for each input.
      Note: The LMU-3641 uses only the first four inputs; the LMU-4233 can use all seven.
      If you do not see the input events in CalAmp K-12, you can submit an RMA for the LMU as shown in Returning Hardware and Obtaining a Replacement (Performing an RMA).
       
  9. If the LMU connects to a mobile data terminal (MDT), you'll also need to check that the Aux 2/Serial 2 port has connectivity; you can do so as follows:
     
    1. For an LMU-3641, switch the Display Power from Ignition button to the On position.
        
      For an LMU-4233, switch the Display Power from LMU button to the On position.
       
    2. Snap the kit mobile data terminal (MDT) into the cradle.
       
    3. Connect the MDT cradle to the test kit display cable.
       
    4. Connect the test kit display cable to Aux 2 for the LMU-4233 and to the Serial 2 cable for the LMU-3641.
      Note: If you're using an LMU-3641, you'll need to use the 6-pin–to–5-pin adapter.
       
      The MDT will power on.
       
      If it displays "LMU connected," the Aux 2/Serial 2 port is functioning as expected.