Multiplex Integrated Control System Sleep and Wake-Up Mode Test

Multiplex Integrated Control System Sleep and Wake-Up Mode Test

1. Shift to the sleep mode:

Close all doors. Turn the ignition switch to LOCK (0), remove the key without keyless access system, then open and close the driver's door. If the MICU receives no signals from the inputs listed below, it will go into sleep mode in less than 50 seconds.

- IG1 power supply
- IG2 power supply
- B-CAN data
- Trunk lid outer handle switch (ON)

2. Confirm the sleep mode:

NOTE: Check any official Honda service website for more service information about parasitic draw at the battery.

Check the parasitic draw at the battery while shifting into the sleep mode; amperage should change from about 200 mA to less than 35 mA in less than 50 seconds.

3. Shift to the wake-up mode:

When the ignition switch is turned to ON (II), the MICU and all B-CAN system components wake-up at the same time without "talking" to each other through the communication lines. When any switch in the multiplex integrated control system is turned on, it wakes up its related control unit which, in turn, wakes up the other units. After confirming the sleep mode, look in the following table for the switch most related to the problem. Operate that switch and see if its control unit wakes up.

NOTE: If any control unit is faulty and does not wake up, several circuits in the system will malfunction at the same time. In the table below is a list of the switches and input signals that wake them up.

- IG1 power supply
- IG2 power supply
- B-CAN data
- Trunk latch switch (Trunk open)
- Trunk lid outer handle switch (ON)
- Ignition key switch (key inserted)