Nissan Altima L32. Instruction — part 120

BCS-14

< FUNCTION DIAGNOSIS >

[BCM]

SIGNAL BUFFER SYSTEM

SIGNAL BUFFER SYSTEM

System Diagram

INFOID:0000000004202231

System Description

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OUTLINE

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

Signal transmission function list

JPMIA0070GB

Signal name

Input

Output

Description

• Ignition switch ON signal
• Ignition switch signal

Engine switch (push switch)

IPDM E/R (CAN)

Inputs the push-button ignition
switch (push switch) signal and
transmits the ignition switch sta-
tus judged with BCM via CAN
communication.

Door switch signal

Any door switch

• Combination meter (CAN)
• IPDM E/R (CAN)

Inputs the door switch signal
and transmits it via CAN com-
munication.

Trunk switch signal

Trunk room lamp switch

Combination meter (CAN)

Inputs the trunk room lamp
switch signal and transmits the
trunk switch signal via CAN
communication.

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-15

< FUNCTION DIAGNOSIS >

[BCM]

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POWER CONSUMPTION CONTROL SYSTEM

System Diagram

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System Description

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OUTLINE

• BCM incorporates a power saving 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 (IPDM E/R and combination meter) 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 60 ms interval.

Sleep mode activation

• BCM receives the sleep-ready signal (ready) from IPDM E/R and combination meter via CAN communica-

tion.

• 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 wakeup 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.

ALCIA0030GB

BCS-16

< FUNCTION DIAGNOSIS >

[BCM]

POWER CONSUMPTION CONTROL SYSTEM

Sleep condition

Wake-up operation

• BCM changes from the low power consumption mode to the CAN communication sleep mode when the any

of the BCM wake-up conditions is fulfilled. Only the control with BCM is activated.

• BCM transmits the sleep wake up signal (wake up) to each unit when any of the CAN wake-up conditions is

fulfilled. It changes from the low power consumption mode or the CAN communication sleep mode to the

normal mode.

• Each unit starts the transmission of CAN communication with the sleep wake up signal. In addition, the com-

bination meter transmits the wake up signal to BCM via CAN communication to report the CAN communica-

tion start.

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 and panic alarm : No operation
• Warning lamp: Not operation
• Intelligent Key system buzzer: No operation
• Trunk room lamp switch status: No change
• Brake switch: OFF
• Key slot status: No change
• Turn signal indicator lamp: No operation
• Exterior lamp: OFF
• Door lock status: No change
• CONSULT-III communication status: No communication
• Meter display signal : Non-transmission
• Electronic steering column lock operation: No operation
• Door switch status: No change
• Rear window defogger: OFF

• Interior room lamp battery saver: Time out
• RAP system: OFF
• Power window switch communication: No transmission
• Push-button ignition switch (push switch) illumination: OFF
• NATS: No operation
• Remote keyless entry receiver communication status: No

communication

• Tire pressure monitor system: Stop

BCM wake-up condition

CAN wake-up condition

• Door unlock sensor: OFF

→ON, ON→OFF

• Door lock lock assembly LH (key cylinder switch): Lock or un-

lock

• Door lock switch: OFF

→ON

• Door unlock switch: OFF

→ON

• Trunk lid opener switch: OFF

→ON

• Power window serial link communication: Receiving
• Remote keyless entry receiver: Receiving valid keyfob

• Receiving the sleep-ready signal (Not-ready) from any units
• Key slot: OFF

→ON, ON→OFF

• Push-button ignition switch (push switch): OFF

→ON

• Hazard switch: OFF

→ON

• PASSING switch: OFF

→ON, ON→OFF

• TAIL LAMP switch: OFF

→ON

• Driver door switch: OFF

→ON, ON→OFF

• Passenger door switch: OFF

→ ON, ON → OFF

• Trunk room lamp switch: OFF

→ON, ON→OFF

• Driver door request switch: OFF

→ON

• Passenger door request switch: OFF

→ON

• Trunk request switch: OFF

→ON

• Stop lamp switch 2 signal: ON
• Clutch interlock switch: OFF

→ON

• Remote keyless entry receiver: Receiving valid keyfob

BCS

POWER CONSUMPTION CONTROL SYSTEM

BCS-17

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Component Parts Location

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1.

BCM M16, M17, M18, M19, M20,
M21 (view with instrument panel re-
moved) (coupe shown, sedan simi-
lar)

2.

Combination meter M24

3.

IPDM E/R E16, E17, E18, E200,
E201, F10

ALMIA0317ZZ