Vehicle monitoring system

A vehicle monitoring system comprising:

• an acquisition unit provided in a vehicle, said acquisition unit configured to acquire at least one of images or sounds;
• and
• an error detection unit provided in the vehicle, said error detection unit configured to detect errors in the vehicle,
• when the error detection unit has detected an error, acquisition results output from the acquisition unit are sent outside the vehicle via a mobile information terminal provided in the vehicle,
• the mobile information terminal comprises a rechargeable battery unit, and the acquisition unit, of an on-board device, is powered by the rechargeable battery unit of the mobile information terminal,
• the mobile information terminal is configured to change an error detection mode of the error detection unit in accordance with a state of the rechargeable battery unit in the mobile information terminal,
• a power source unit of the on-board device is configured to recharge the rechargeable battery unit by using power from an on-board battery, and
• the power source unit of the on-board device is also powered by the on-board battery in accordance with a state of the on-board battery.