Volkswagen Magotan prompts to check the can bus, and the battery has no communication for the following reasons:

1, on the one hand, it is the wiring harness, and there are few open circuits, most of which are caused by loose plugs, resulting in poor contact and CAN't communicate; On the other hand, there is something wrong with the entertainment system itself, that is, the ecu computer does not work and the internal electronic components are burnt out. First, turn on the power button of the entertainment system to see if it works. If it works, it means there is no problem with the power supply.