With the improvement of drift removal algorithms and the use of 3D motion sensors, even if the ACC detection line is not connected, it will not have any impact on the accuracy of vehicle positioning. Therefore, it is necessary to connect the ACC status detection line as much as possible. Connecting the ACC ignition status detection line has the following advantages:

　　1. It can effectively determine whether the vehicle has been in a ignition state for a long time when parked

　　2. When the GPS positioning of the vehicle is invalid, the ACC ignition status can be used as a basis for fault diagnosis. For example, if the GPS positioning is invalid and the vehicle's ACC is turned off, it is highly likely that the vehicle is in an area shielded by GPS signals, such as an underground parking lot. There is no need to worry about this state, and it can be repositioned after the vehicle moves. If the ACC is in a firing state, it is possible that there is a signal shield above the GPS device in the car, or if the device malfunctions, the driver needs to be contacted for troubleshooting.

　　3. Through ACC status detection, the Beidou GPS locator can automatically switch working modes, minimizing the loss of the car's battery.

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