Wake-up and Sleep Function
The multiplex control system has ‘‘wake-up'' and ‘‘sleep'' functions to decrease the parasitic draw on the battery when the ignition switch is OFF.
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In the sleep mode, the MICU stops functioning (communication and CPU control) when it is not necessary for the system to operate.
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As soon as any operation is requested (for example, a door is unlocked), the related control unit the sleep mode immediately wakes up and begins to function.
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When the ignition switch is turned OFF, and the driver's door is opened, then closed, there is a delay of about 40 seconds before the control unit goes from the wake-up mode to the sleep mode.
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The sleep mode will not function if any door is opened or if an ignition key is in the ignition switch.
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The draw is reduced from 200 mA to less than 35 mA when in the sleep mode.