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), and remove the key, 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 40 seconds.

- IG1 power supply

- IG2 power supply

- B-CAN data

- Hazard warning switch (OFF)

- Hatch outer handle switch (OFF)

- Driver's door key cylinder switch (LOCK/UNLOCK)

- Driver's door lock switch (LOCK/UNLOCK)

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 after 40 seconds; amperage should change 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, the gauge control module, the immobilizer-keyless control unit, the climate control unit, the HandsFreeLink control unit, and the PCM 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 malfunction at the same time. Below is a list of the switches and the input signals that wake them up.

- IG1 power supply

- IG2 power supply

- ACC power supply

- Driver's door lock switch (LOCK/UNLOCK)

- Driver's door switch (door open)

- Front passenger's door switch (door open)

- Left rear door switch (door open)

- Right rear door switch (door open)

- Hatch latch switch (hatch open)

- Driver's door key cylinder switch (LOCK/UNLOCK)

- Driver's door lock knob switch (LOCK/UNLOCK)

- Front passenger's door lock knob switch (UNLOCK)

- Left rear door lock knob switch (UNLOCK)

- Right rear door lock knob switch (UNLOCK)

- Audio unit or audio-navigation unit switch (security line disconnected)

- Hatch outer handle switch (switch pressed)

- Hazard warning switch (ON)

- Combination light switch (Parking, Headlight, Passing)

- Ignition key switch (key inserted)

- Security hood switch (hood open)

- B-CAN data

- Keyless transmitter signals