RDX AWD L4-2.3L Turbo (2010)
Wake-up and Sleep Function
The multiplex integrated control system has "wake-up" and "sleep" functions to decrease parasitic draw on the battery when the ignition switch is turned
to LOCK (0).
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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 in the sleep mode immediately wakes up and
begins to function.
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When the ignition switch is turned to LOCK (0) with all the doors and the tailgate closed, and the driver's door is opened, then closed, there is a
delay 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 and tailgate are opened or if a key is in the ignition.
NOTE: Sleep and Wake-up Mode Test See: Testing and Inspection/Component Tests and General Diagnostics/Multiplex Integrated Control System
Sleep and Wake-Up Mode Test.
Fail-safe Function
To prevent improper operation, the MICU has a fail-safe function. In the fail-safe mode, the output signal is fixed when any part of the system
malfunctions (for example, a faulty control unit or communication line).
Each control unit has a hardware fail-safe function that fixes the output signal when there is a CPU malfunction, and a software fail-safe function that
ignores the signal from a malfunctioning control unit, which allows the system to operate normally.
Hardware Fail-safe Control
Fail-safe function
