If your LMU-364x seems to be failing, before contacting CalAmp about returning it, first try the following troubleshooting steps to make sure that something else other than the hardware isn't causing the problem:
- Make sure that the vehicle has a clear view of the sky.
- Check that the vehicle ignition key is in the ON position.
- Make sure that the device's label is facing the sky.
For an LMU-3641, check that the antenna connections in the back are secure and have a clear view of the sky.
- Check the status LEDs:
- Ensure that the COMM LED is solid orange. This is what the LED states indicate:
Condition COMM LED (Orange) Modem off Off COMM on - searching Slow blinking Network available Fast blinking Registered but no inbound acknowledgment Alternates from solid to fast blink every 1 second Registered and received inbound acknowledgment Solid
- Ensure that the GPS LED is solid green. Here is a description of its LED behavior:
Condition GPS LED (Green) GPS off Off GPS on Slow blinking GPS time sync Fast blinking GPS fix Solid
- Ensure that the VBUS LED is solid red. These are the VBUS LED conditions:
Condition VBUS LED (Red) VBUS off Off VBUS on On
- Ensure that the COMM LED is solid orange. This is what the LED states indicate:
- Make sure that the cabling isn't bent or constricted (and not cut!).
- Verify that the wiring connections for power, ground, and ignition are not loose or broken:
- Red wire to a constant (unswitched) +12 VDC or +24 VDC supply — preferably, connected directly to the vehicle battery terminal or as close to it as possible. This connection point should be fuse-protected to not more than 5 amps.
- White wire to the vehicle ignition.
- Black wire to chassis ground.
- Verify that the fuses are in place and are functional.
- Red wire to a constant (unswitched) +12 VDC or +24 VDC supply — preferably, connected directly to the vehicle battery terminal or as close to it as possible. This connection point should be fuse-protected to not more than 5 amps.
- Verify that the LMU (location messaging unit) is reporting to CalAmp K-12:
- Open the CalAmp K-12 mobile app, which is available in Google Play or the App Store, on a mobile device. In the vehicle list, tap the vehicle name. (See Tracking a Vehicle for more details.) If the LMU is reporting live, a map will appear showing the bus's location. Below the map, check the number to the right of Sats (the GPS satellite count); make sure that it is 5 or higher. Also check to the right of Event. Make sure that this reads Ignition On when the vehicle is running and Ignition Off when it is off.
Note: You'll need to log in to the app using a CalAmp K-12 login, not a punch ID. - On a computer, use CalAmp K-12 (https://login.synovia.com) to check whether any events are being reported for the vehicle and that it appears in its current location on the map. (See Tracking a Vehicle for more details.)
- Open the CalAmp K-12 mobile app, which is available in Google Play or the App Store, on a mobile device. In the vehicle list, tap the vehicle name. (See Tracking a Vehicle for more details.) If the LMU is reporting live, a map will appear showing the bus's location. Below the map, check the number to the right of Sats (the GPS satellite count); make sure that it is 5 or higher. Also check to the right of Event. Make sure that this reads Ignition On when the vehicle is running and Ignition Off when it is off.
- If step 7 shows that the bus still isn't reporting data to CalAmp K-12, try swapping out the nonfunctioning LMU for a known working LMU, just to check for certain whether the device is the problem.
If data is being received from the LMU but you are still having issues, try troubleshooting any peripheral devices.
If you've tried all these troubleshooting steps and the device is still malfunctioning, you can open a ticket at CalAmp JIRA Service Desk. (You can find more details at Returning Hardware and Obtaining a Replacement [Performing an RMA].)