Sleep and Wake-up Mode Test
- Shift to the sleep mode:
Turn the ignition switch to LOCK (0), 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.
Driver's door lock switch (LOCK or UNLOCK)
Driver's door key cylinder switch (LOCK or UNLOCK)
Front passenger's door lock switch (LOCK or UNLOCK)
Tailgate latch switch (Tailgate closed)
Hazard warning switch (OFF)
Power tailgate outer handle switch
Power tailgate inside switch
Power tailgate opener switch
- Confirm the sleep mode:
Measure the frequency on the B-CAN communication line (LT GRN wires); there should be 0 Hz in the sleep mode. Check the parasitic draw at the battery while shifting into the sleep mode; amperage should change from about 2.6 A to less than 35 mA.
- Shift to the wake up mode:
When the ignition switch is turned ON (II), the MICU, and all B-CAN system components wake up. When any switch in the multiplex integrated control system is turned on, a message is sent to the related control unit(s) to command the desired function. 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. In the table below, the control unit is followed by a list of the switches and input signals that can wake it up.Door switches (door open)
Driver's door lock switch (LOCK or UNLOCK)
Driver's door lock knob switch (LOCK or UNLOCK)
Driver's door key cylinder switch (LOCK or UNLOCK)
Front passenger's door lock switch (LOCK or UNLOCK)
Front passenger's door lock knob switch (LOCK or UNLOCK)
Left rear door lock knob switch
Right rear door lock knob switch
Tailgate latch switch (Tailgate open)
Hood switch (hood open)
Hazard warning switch (ON)
Combination light switch (Parking, Headlight, Dimmer, Passing ON)
Ignition key switch (key inserted)