Power management systems, methods, and programs for in-vehicle devices

A power management system, comprising:

• an in-vehicle device including an in-vehicle device controller that:
• transfers connection information to a power management device, the connection information indicating whether the in-vehicle device can communicate with the power management device;
• and
• transfers condition information to the power management device, the condition information indicating that the in-vehicle device is ready for turning off;
• or
• sets the in-vehicle device to not communicate with the power management device when a predetermined condition is met, the predetermined condition indicative of an inability of the in-vehicle device to transfer information to the power management device;
• and
• the power management device including a power management controller that:
• requests the connection information from the in-vehicle device;
• requests the condition information from the in-vehicle device;
• and
• determines that the in-vehicle device is ready for turning off when:
• both the connection information and the condition information have been received from the in-vehicle device;
• or
• no connection information has been received from the in-vehicle device because the in-vehicle device has been set to not communicate with the power management device.