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 50 seconds.

IG1 power supply
IG2 power supply
B-CAN data
Trunk lid latch switch (Trunk lid closed) (OFF)
Tailgate latch switch (Tailgate closed) (OFF)
Hazard warning switch (OFF)

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 driver's MICU, passenger's MICU, gauge control module, immobilizer-keyless control unit, and ECM/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 will not wake up, several circuits in the system will 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
B-CAN data
Driver's door switch (door open)
Left rear door switch (door open)
Trunk lid latch switch (Trunk lid open)
Tailgate latch switch (Tailgate open)
Tailgate outer handle switch (Tailgate open)
Left rear door lock knob switch
Security hood switch (hood open)
Hazard warning switch (ON)
Combination light switch (Parking, Headlight, Dimmer, Passing ON)
Ignition key switch (key inserted)
Trunk lid opener main switch (ON)
Driver's door key cylinder switch (LOCK/UNLOCK)
Passenger's rear door lock knob (UNLOCK)
Front passenger's door lock knob (UNLOCK)
Driver's door lock switch (LOCK/UNLOCK)
Front passenger's door lock switch (LOCK/UNLOCK)
Front passenger's door switch (door open)
Passenger's rear door switch (door open)
Trunk release switch (ON)