Communication between a clock unit and an auxiliary heater in a vehicle
Publication Date: 2003-May-13
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A separate cable between a clock unit and an auxiliary heater is incorporated in a vehicle in addition to serial bus, such as a CAN-bus. The cable is powered at least when the ignition is off, but it requires less power from the battery unit. When a fault is registered by the auxiliary heater when the ignition is off, the auxiliary heater sends a time request to the clock unit, which returns an acknowledgement and the time counted by the clock unit. That time is then used as the time when the fault was registered.