Infiniti QX56 (JA60). Manual - part 98

BCS

COMBINATION SWITCH READING SYSTEM

BCS-11

< FUNCTION DIAGNOSIS >

[BCM]

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1.

BCM M18, M19, M20 (view with in-
strument panel removed)

2.

Combination switch (lighting and 
turn signal switch) M28

3.

Combination switch (wiper and 
washer switch) M28

BCS-12

< FUNCTION DIAGNOSIS >

[BCM]

SIGNAL BUFFER SYSTEM

SIGNAL BUFFER SYSTEM

System Diagram

INFOID:0000000005146389

System Description

INFOID:0000000005146390

OUTLINE

BCM has the signal transmission function that outputs/transmits each input/received signal to each unit.

Signal transmission function list

ALMIA0263GB

Signal name

Input

Output

Description

Oil pressure switch signal

IPDM E/R (CAN)

Combination meter (CAN)

Transmits the received oil pres-
sure switch signal via CAN 
communication.

BCS

POWER CONSUMPTION CONTROL SYSTEM

BCS-13

< FUNCTION DIAGNOSIS >

[BCM]

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POWER CONSUMPTION CONTROL SYSTEM

System Diagram

INFOID:0000000005146391

System Description

INFOID:0000000005146392

OUTLINE

• BCM incorporates a power consumption control function that reduces the power consumption according to

the vehicle status. 

• BCM switches the status (control mode) by itself with the power saving control function. It performs the sleep

request to each unit (PDM E/R, combination meter and Intelligent Key unit) that operates with the ignition

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

LOW POWER CONSUMPTION CONTROL WITH BCM

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 20 ms interval.

Sleep mode activation

• BCM receives the sleep-ready signal (ready) from IPDM E/R, combination meter and Intelligent Key unit  via

CAN communication.

• BCM transmits the sleep wake up signal (sleep) to each unit when all of the CAN sleep conditions are ful-

filled.

• Each unit stops the transmission of CAN communication with the sleep wake up signal. BCM is in CAN com-

munication sleep mode.

• BCM is in the low power consumption mode and perform the low power consumption control when all of the

BCM sleep conditions are fulfilled with CAN sleep condition.

AWMIA0082GB

BCS-14

< FUNCTION DIAGNOSIS >

[BCM]

POWER CONSUMPTION CONTROL SYSTEM

Sleep condition

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 with CAN communication by receiving sleep wake up signals. Each unit trans-

mits wake up signals to BCM with CAN communication to convey the start of CAN communication.

Wake-up condition

CAN sleep condition

BCM sleep condition

• Receiving the sleep-ready signal (ready) from all units
• Ignition switch: OFF
• Vehicle security system alarm: No operation
• Warning lamp: No operation
• Warning chime: No operation
• Stop lamp switch: OFF
• Key switch status: No change for 2 seconds
• Hazard warning lamp: No operation
• Exterior  lamp:  OFF
• Door lock status: No change for 2 seconds
• CONSULT-III communication status: No communication
• Door switch status: No change for 2 seconds

The controls only BCM are completed.
(Interior room lamp battery saver: Time out etc.)

BCM wake-up condition

• Ignition switch: OFF 

→ ACC or ON

• Stop lamp switch: ON (Depress brake pedal)
• Any door switch: OFF 

→ ON

• Lighting switch: OFF 

→ 1ST or PASS

• Hazard switch: OFF 

→ ON

• Back door opener switch OFF 

→ ON

• Remote keyless entry receiver: Receiving
• Intelligent Key unit: Receiving