Wake-up and Sleep

WARNING: This page is about a different car, the 2008 Honda Pilot, 2007 Honda Pilot, and 2006 Honda Pilot. However, it is still accessible from the selected car via links, so may be relevant.

The multiplex control system has "wake-up" and "sleep" functions to decrease parasitic draw on the battery when the ignition switch is OFF.

In the sleep mode, the multiplex control unit stops the functions (communication and CPU control) when it is not necessary for the system to operate.
As soon as any operation is requested (for example, door is unlocked), the related control unit in the sleep mode immediately wakes up and begins to function. This control unit also sends a wake-up signal to the other control units via the communication lines.
When the ignition switch is turned OFF, and the driver's or front passenger's door is opened and closed, there is about a 15 second delay before the control units go from the wake-up mode to the sleep mode.
If any door is open, the sleep mode will not function.
If the key is in the ignition switch, the sleep mode will not function.
If a door or tailgate key cylinder switch is shorted, the sleep mode will not function.
When in the sleep mode, the current draw is reduced from 60-80 mA to less than 20 mA.