Description of the issue: The client complains that the vehicle is displayed in incorrect location.
Possible causes of the issue:
Power supply is too low.
The vehicle is in the underground/multilevel parking where Satellites signal is 0;
The vehicle left the underground parking but could not acquire GPS fix before Stationary Navigation filtering is switched ON.
Troubleshooting steps:
1. Open the webuser according to Basic troubleshooting for Car sharing objects (Ride Share)
2. Find the object by the plate number (object name) in TT2:
3. Navigate to "Analyze by coordinates":
4. Turn on the following parameters to be visible in the graph:
Digital input 4
GSM signal strength
Power supply voltage
Satellites
5. Check the power supply voltage:
In case, Power supply voltage is below 10 Volts, inform the client that power supply was lost and the car must be checked physically. In case voltage is more than 10 Volts, follow further steps.
6. Check satellites signal. Satellites count and GNSS status shall be checked by sending SMS command:
cspsm coords
7. In case the device responds with more than 4 satellites and GNSS state 3:
2022-02-14 17:36, lat. 54.6997683, long. 25.2558200, alt. 127.3, sat. 22, dir. 325.90, hdop 70, state 3
It means the device has GPS fix at the moment, most likely it is a "Frozen location" issue, related to Stationary navigation filtering (navigate to the follow-up article for troubleshooting steps);
8. In case the device responds with 0 satellites and GNSS state 2:
2022-02-14 17:36, lat. 54.6997683, long. 25.2558200, alt. 127.3, sat. 0, dir. 325.90, hdop 100, state 2
It means the device does not have GPS fix. Further investigation is needed.
9. Examine the last received data in "Analyze by coordinates" module:
10. Check whether the vehicle was moving while satellites signal was 0. The best indicators are the following IO parameters:
"Digital input 4" -- Ignition detection method in most devices ("1" means "ignition ON");
"Speed (wheel)" -- CAN parameter, more than 0 means that wheels are spinning;
"Mileage" or "CANBUS distance" -- CAN parameter, showing that vehicle moved;
Example A: the device (most likely) was not moving without satellites signal.
In the example above, vehicle lost satellites and its mileage did not change significantly, it's ignition was OFF since a few minutes it has entered underground parking and remains OFF until now. This allows to think that the vehicle is still located at the same underground/multilevel parking.
Example B: the device has been moving without satellites signal.
In case device does not have GPS fix at the moment and had ignition ON and/or Speed (wheel) was detected and/or mileage increased with no satellites, the each case should be checked individually. There is a possibility that the vehicle is still located in the same underground parking, or there is some issue with internal GNSS antenna (i.e. incorrect mounting position of the device).
In this article you can find tips how to check the correct location of the vehicle. [TBA]