Nissan Sentra. Manual - part 128

BCS-82

< SYSTEM DESCRIPTION >

[WITHOUT INTELLIGENT KEY SYSTEM]

SYSTEM

• The circuit between OUTPUT 4 and INPUT 5 is formed when the TAIL LAMP switch is turned ON.

• BCM detects the combination switch status signal “5D” when the signal of OUTPUT 4 is input to INPUT 5.

• BCM judges that the TAIL LAMP switch is ON when the signal “5D” is detected.

Example 2: When some switches (TURN RH, TAIL LAMP) are turned ON

• The circuits between OUTPUT 1 and INPUT 5 and between OUTPUT 4 and INPUT 5 are formed when the

TURN RH switch and TAIL LAMP switch are turned ON.

• BCM detects the combination switch status signal “5AD” when the signals of OUTPUT 1 and OUTPUT 4 are

input to INPUT 5.

• BCM judges that the TURN RH switch and TAIL LAMP switch are ON when the signal “5AD” is detected.

SIGNAL BUFFER

AWMIA1222GB

AWMIA1223GB

BCS

SYSTEM

BCS-83

< SYSTEM DESCRIPTION >

[WITHOUT INTELLIGENT KEY SYSTEM]

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SIGNAL BUFFER : System Diagram

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SIGNAL BUFFER : 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

POWER CONSUMPTION CONTROL SYSTEM
POWER CONSUMPTION CONTROL SYSTEM : System Diagram

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POWER CONSUMPTION CONTROL SYSTEM : System Description

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OUTLINE

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

vehicle status. 

AWMIA1513GB

Signal name

Input

Output

Description

Ignition switch ON signal

Ignition switch

IPDM E/R (CAN)

Inputs the ignition switch signal 
and transmits it with CAN com-
munication.

Brake switch signal

Stop lamp switch

IPDM E/R (CAN)

Inputs the brake switch signal 
and transmits it with CAN com-
munication.

Door switch signal

Any door switch

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

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

Blower fan ON signal

A/C auto amp.

ECM (CAN)

Inputs each signals, and trans-
mits the blower fan ON signal 
and A/C ON signal via CAN 
communication.

A/C ON signal

AWMIA1208GB

BCS-84

< SYSTEM DESCRIPTION >

[WITHOUT INTELLIGENT KEY SYSTEM]

SYSTEM

• 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 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 wake up signal. BCM is in CAN com-

munication sleep mode.

• 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

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.

CAN sleep condition

BCM sleep condition

• Receiving the sleep-ready signal (ready) from all units
• Ignition switch: OFF
• Panic alarm: No operation
• Warning chime: No operation
• Stop lamp switch: OFF
• Turn signal indicator lamp: No operation
• Exterior lamp: OFF
• Door lock status: No change
• CONSULT communication status: No communication
• Door switch status: No change
• Rear window defogger: OFF
• Driver door lock status: No change
• Key switch status: No change

• Interior room lamp battery saver: Time out
• RAP system: OFF
• Nissan Vehicle Immobilizer System (NVIS) - NATS: No opera-

tion

• Remote keyless entry receiver communication status: No com-

munication

BCS

SYSTEM

BCS-85

< SYSTEM DESCRIPTION >

[WITHOUT INTELLIGENT KEY SYSTEM]

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Wake-up condition

Wake-up condition

• Receiving the sleep-ready signal (Not-ready) from any units
• Hazard switch: ON
• HI BEAM switch: OFF 

→ ON, ON → OFF

• PASSING switch: OFF 

→ ON, ON → OFF

• HEADLAMP 1 switch: OFF 

→ ON, ON → OFF

• HEADLAMP 2 switch: OFF 

→ ON, ON → OFF

• TAIL LAMP switch: OFF 

→ ON

• TURN RH: OFF 

→ ON, ON → OFF

• TURN LH: OFF 

→ ON, ON → OFF

• Driver door switch: OFF 

→ ON, ON → OFF

• Passenger door switch: OFF 

→ ON, ON → OFF

• Rear door switch RH: OFF 

→ ON, ON → OFF

• Rear door switch LH: OFF 

→ ON, ON → OFF

• Stop lamp switch: ON
• Door lock and unlock switch:

NEUTRAL 

→ LOCK, NEUTRAL → UNLOCK

• Front door lock assembly (driver side) (door key cylinder switch):

NEUTRAL 

→ LOCK, NEUTRAL → UNLOCK

• Remote keyless entry receiver communication: Receiving