System Description
SYSTEM DIAGRAM
OUTLINE
- The BCM incorporates a power saving control function that reduces the power consumption according to the vehicle status.
- The BCM switches the status (control mode) by itself with the power saving control function. It performs the sleep request to each unit (IPDM E/R, combination meter and Electrically-driven Intelligent Brake unit) that operates with the power switch OFF.
Normal mode (wake-up)
- CAN communication is normally performed with other units
- Each control with BCM is operating properly
CAN communication sleep mode (CAN sleep)
- CAN transmission is stopped
- Control with BCM only is operating
Low power consumption mode (BCM sleep)
- Low power consumption control is active
- CAN transmission is stopped
INPUT SIGNAL AND OUTPUT SIGNAL
Major signal transmission between each unit via communication lines is shown in the following table:
| Component parts | Signal description |
|---|---|
| IPDM E/R |
|
| Combination meter | |
| Electrically-driven Intelligent Brake unit | |
| BCM |
|
LOW POWER CONSUMPTION CONTROL WITH BCM
The BCM reduces the power consumption with the following operation in the low power consumption mode.
- The reading interval of the each switches changes from 10 ms interval to 60 ms interval.
Sleep mode activation
- The BCM receives the sleep-ready signal (ready) from IPDM E/R and combination meter via CAN communication.
- The BCM transmits the sleep signal (sleep) to each unit when all of the CAN sleep conditions are fulfilled.
- Each unit stops the transmission of CAN communication with the sleep wake up signal. The BCM is in CAN communication sleep mode.
- The BCM is in the low power consumption mode and performs the low power consumption control when all of the BCM sleep conditions are fulfilled with CAN sleep condition.
Sleep condition
| CAN sleep condition | BCM sleep condition |
|---|---|
|
|
NOTE:
*: Refer to System Description
for details of the interior room lamp battery saver time.
Wake-up operation
- BCM transmits sleep wake up signal (wake up) to each unit when any condition listed below is established, and then goes into normal mode from low power consumption mode.
- Each unit starts transmissions via CAN communication by receiving sleep wake up signals. Each unit transmit wake up signals to BCM via CAN communication to convey the start of CAN communication.
Wake-up condition
| Wake-up condition |
|---|
|