Nissan Sentra B18 (2020-2025) Service Manual: System

Meter System

System Description

System Description

SYSTEM DIAGRAM

Combination Meter Input Signal (CAN Communication Signal)

Transmit unit	Signal name
ABS actuator and electric unit (control unit)	Odometer signal
	ABS warning lamp signal
	VDC warning lamp signal
	VDC OFF indicator lamp signal
	Brake warning lamp signal
Intelligent Key unit	Buzzer output signal
	Meter display signal
BCM	Position light status signal
	Door switch signal
	High beam status signal
	Light reminder warning signal
	Turn indicator signal
	Meter display signal
	Sleep wake up signal
	Front seat belt buckle switch LH signal
	TPMS malfunction warning lamp signal
	Low tire pressure warning lamp signal
	Low tire pressure wheel location signal
	Dimmer signal
	ECO mode indicator lamp signal
	Buzzer output signal
TCM (with CVT)	Shift position signal
	Shift position indicator signal
	CVT warning message signal
	Ds mode indicator signal
ECM	Nissan Sentra Vehicle speed display signal
	Engine speed signal
	Engine coolant temperature signal
	Engine warning display signal
	Fuel filler cap warning display signal
	Fuel consumption monitor signal
	Remaining distance signal
	Malfunctioning indicator lamp signal
	Engine oil pressure warning lamp signal
	Engine status signal
	ECO mode indicator lamp signal
	ECO drive indicator control signal
	ECO pedal guide signal
	Battery warning request signal
	Stop/Start indicator lamp and message request signal
EPS (Electric Power Steering) control unit	EPS warning lamp signal
ADAS control unit 2	AEB warning lamp signal
	RAB warning lamp signal
	Meter display signal
Front camera unit	Meter display signal
Side radar LH	Meter display signal
Side radar RH	Meter display signal
Sonar control unit	Parking sensor error signal
	Sonar indicator signal
Air bag diagnosis sensor unit	Front seat belt buckle switch RH signal
	Rear seat belt buckle switch LH signal
	Rear seat belt buckle switch RH signal
	Rear seat belt buckle switch center signal
	SRS air bag warning lamp signal
IPDM E/R (Intelligent Power Distribution Module Engine Room)	Headlamp warning signal
	Starter relay status signal
	Battery warning request signal
Chassis control module (with built in steering angle sensor)	Meter display signal

DESCRIPTION

Combination Meter

• The combination meter receives necessary signals from each unit, switch, and sensor to control the following functions:

  • Measuring instruments

    • Speedometer

    • Tachometer

    • Engine coolant temperature gauge

    • Fuel gauge

  • Warning lamps

  • Indicator lamps

  • Meter illumination control

  • Meter effect function

  • Information display

• The combination meter incorporates a buzzer function that sounds an audible alarm with the integrated buzzer. For further details. Refer to System Description for further details.

• The combination meter includes an on board diagnosis function.

• The combination meter can be diagnosed with CONSULT.

METER CONTROL FUNCTION LIST

System				Description	Reference
Measuring instruments	Speedometer			Indicates Nissan Sentra vehicle speed.	System Description
	Tachometer			Indicates engine speed.	System Description
	Engine coolant temperature gauge			Indicates engine coolant temperature.	System Description
	Fuel gauge			Indicates fuel level.	System Description
Warning lamp/indicator lamp	Engine oil pressure warning lamp			The warning lamp turns ON or turns OFF, according to engine hydraulic pressure.	System Description
Meter illumination control	Meter illumination control function			Switch back and forth between daytime mode and night mode, according to a light switch position.	System Description
	Back light illumination control function			The operation of the illumination control switch allows the brightness adjustment of meter illumination.
Meter effect function	Engine-start effect function			Meter illumination at ignition switch ON from OFF to produce illumination effects.	System Description
Information display				The Information display displays status, according to system malfunction or Nissan Sentra vehicle condition.	System Description

Speedometer

System Description

System Description

SYSTEM DIAGRAM

System Description

The ABS actuator and electric unit (control unit) receives each wheel speed sensor signal and provides a Nissan Sentra vehicle speed signal to the combination meter via CAN communication.

Tachometer

System Description

System Description

SYSTEM DIAGRAM

System Description

DESCRIPTION

The crank position sensor sends a crankshaft position signal to the ECM. The ECM provides an engine speed signal to the combination meter via CAN communication lines.

The tachometer indicates engine speed in revolutions per minute (rpm).

Engine Coolant Temperature Gauge

System Description

System Description

SYSTEM DIAGRAM

System Description

The engine coolant temperature sensor sends an engine coolant temperature signal to the ECM. The ECM provides an engine coolant temperature signal to the combination meter via CAN communication lines.

The engine coolant temperature gauge indicates the engine coolant temperature.

Fuel Gauge

System Description

System Description

SYSTEM DIAGRAM

DESCRIPTION

Control Outline

The combination meter reads the fuel level sensor signal from the fuel level sensor unit and indicates the fuel level to the fuel gauge.

Refuel Control

The combination meter accelerates the fuel gauge if the all conditions listed below are met, or the ignition switch is ON from OFF.

• Ignition switch is ON.

• The Nissan Sentra vehicle is not moving.

• The fuel level change by 4 (1.05US gallons) or more.

Oil Pressure Warning Lamp

System Description

System Description

SYSTEM DIAGRAM

SYSTEM DIAGRAM

System Description

DESCRIPTION

The combination meter turns the oil pressure warning lamp ON when receiving a signal from the ECM via CAN communication.

Meter Illumination Control

System Description

System Description

SYSTEM DIAGRAM

DESCRIPTION

Back Light Illumination Control Function

The operation of the illumination control switch allows the brightness adjustment of meter illumination.

Meter illumination	The number of adjustable steps
Daytime	22 steps
Nighttime	22 steps

Meter Illumination Control Function

• Combination meter controls meter illumination, based on the dimmer signal.

• When ignition is on the combination meter switches mode between Daytime mode and Nighttime mode, according to the following conditions.

  Condition			Meter illumination
  Combination switch (lighting switch)	1ST or 2ND position	Outdoor: Bright*	Daytime mode
  		Outdoor: Dark*	Nighttime mode
  	AUTO POSITION	Outdoor: Bright*	Daytime mode
  		Outdoor: Dark*	Nighttime mode
  	Off		Daytime mode

  *: For further information, refer to System Description.

Signal Path

Signal name	Signal path
Ignition signal	—
Dimmer signal	BCM Combination meter

Information Display

System Description

System Description

SYSTEM DIAGRAM

DESCRIPTION

• The combination meter receives signals necessary for controlling the operation of the information display from each unit, sensor and switch.

• The combination meter incorporates a trip computer that displays the warning/information according to the information received from each unit, sensor and switch.

• The combination meter shows the following functions on the information display:

  • Warning/Indicator

  • Odo/trip meter

  • Distance to empty

  • Warning confirmation

  • Setting

  • Trip computer

  • Ambient temperature

  • Clock

  • Meter illumination level

ODO/TRIP METER

The combination meter calculates mileage, based on the following signals and displays the mileage on the information display.

Signal name	Signal path
Ignition signal	—
Odometer signal	ABS actuator and electric unit (control unit) Combination meter

DISTANCE TO EMPTY

The combination meter calculates distance to empty based on the following signals, and the calculated value is displayed on the information display.

Signal name	Signal source
Ignition signal	—
Fuel level sensor signal	Fuel level sensor unit Combination meter
Fuel consumption monitor signal	ECM Combination meter
Nissan Sentra Vehicle speed display signal	ECM Combination meter

Note:

• Distance to empty on the information display is updated approximately every 30 seconds.

• When at ignition switch ON right after battery removal and installation, “−−−” is displayed until after a travel of 30 seconds.

• The indicated values may not match each other when refueling with the ignition switch ON.

WARNING CONFIRMATION

• The combination meter can cause an interrupt on the information display to indicate a warning, based on signals received from each unit and switch.

• The indicated warning can be checked with “WARNING” during the satisfaction of an interrupt indication condition for each warning.

SETTINGS

The condition of following items can be set:

• VDC Setting

• Driver Assistance

• ECO Mode Setting

• TPMS Setting

• Clock

• Nissan Sentra Vehicle Settings

• Maintenance

• Customize Display

• Unit

• Language

• Factory Reset

TRIP COMPUTER

Current Fuel Consumption

The combination meter calculates current fuel consumption based on the following signals, and the calculated value is displayed on the information display.

Current fuel consumption can be compared with average fuel consumption.

Signal name	Signal source
Ignition signal	—
Fuel consumption monitor signal	ECM Combination meter
Nissan Sentra Vehicle speed display signal	ECM Combination meter
Steering switch signal	Steering switch Combination meter

Note:

• Current fuel consumption on the information display is updated approximately every 0.1 seconds.

• Current fuel consumption on the information display shows 0 mpg (0 l/100km) when Nissan Sentra vehicle speed is 0 MPH (0 km/h).

Average Fuel Consumption

The combination meter calculates average fuel consumption based on the following signals, and the calculated value is displayed on the information display.

Signal name	Signal source
Ignition signal	—
Fuel consumption monitor signal	ECM Combination meter
Nissan Sentra Vehicle speed display signal	ECM Combination meter
Steering switch signal	Steering switch Combination meter

Note:

• Average fuel consumption on the information display is updated approximately every 30 seconds.

• Soon after a reset or at ignition switch ON right after battery removal and installation, “−−−” is displayed until after a travel of 30 seconds and approximately 500 m (0.31 mile).

Current Nissan Sentra Vehicle Speed

The combination meter calculates current vehicle speed based on the following signals, and the calculated value is displayed on the information display.

Signal name	Signal path
Ignition signal	—
Nissan Sentra Vehicle speed display signal	ECM Combination meter

Note:

Current Nissan Sentra vehicle speed on the information display is updated approximately every 0.3 seconds.

Average Vehicle Speed

The combination meter calculates average Nissan Sentra vehicle speed based on the following signals, and the calculated value is displayed on the information display.

Signal name	Signal source
Ignition signal	—
Nissan Sentra Vehicle speed display signal	ECM Combination meter
Steering switch signal	Steering switch Combination meter

Note:

• Average fuel consumption on the information display is updated approximately every 30 seconds.

• Soon after a reset or at ignition switch ON right after battery removal and installation, “−−−” is displayed until after a travel of 30 seconds and approximately 500 m (0.31 mile).

Travel Time

The combination meter measures and displays travel time (ignition switch ON time).

Travel Distance

The combination meter measures and displays travel distance.

ECO Drive Report

• The ECO drive report is a function which displays ECO evaluation, the last five data of average fuel consumption, present fuel economy (present value), and the best fuel economy (highest value) on the information display by calculating and recording average fuel consumption.

  

• The combination meter calculates the average fuel consumption according to the signal below, detects the status of ECO mode , and displays “ECO drive report” on the information display at ignition switch ON from OFF.

  Note:

  ECO evaluation is displayed only when travelling ten minutes or more in ECO mode.

  Signal name	Signal path
  Ignition signal	—
  Fuel consumption monitor signal	ECM Combination meter
  Nissan Sentra Vehicle speed display signal	ECM Combination meter
  ECO mode indicator signal	ECM Combination meter

METER ILLUMINATION LEVEL

The combination meter displays the illuminance level of the back light on the information display by pressing the illumination control switch. Refer to System Description.

CLOCK

The combination meter calculates time and displays it on the information display.

Note:

The settings screen of the information display allows the selection of time indication between 12-hour and 24-hour formats.

AMBIENT TEMPERATURE

The combination meter calculates ambient temperature based on the following signals, and the calculated value is displayed on the information display.

Signal name	Signal path
Ignition signal	—
Ambient sensor signal	Ambient sensor Combination meter
Nissan Sentra Vehicle speed display signal	ECM Combination meter

Note:

• The indicated temperature is corrected based on an ignition signal, ambient temperature detected by the ambient sensor, and Nissan Sentra vehicle speed signal. The indicated temperature is not raised under vehicle speed less than 12 MPH (20 km/h).

• The ambient sensor input value that is displayed on “Data Monitor” of CONSULT is the value before the correction. It may not match the indicated temperature on the information display.

• Depending on engine heat or heat on the road surfaces, an ambient temperature may be indicated higher than actual one.

Meter Effect Function

System Description

System Description

SYSTEM DIAGRAM

DESCRIPTION

Engine-start Effect Function

When recognizing an engine start, the combination meter controls the following items for producing the effect:

• Speedometer

• Tachometer

• Information display

• Meter illumination

Meter and Illumination Operations During Engine-start Effect

The combination meter controls the following items during the engine-start effect:

Control item		Operation
Speedometer		Sweeps the pointer.
Tachometer		Sweeps the pointer.
Illumination ring		Increases the brightness to the effect level in stages.
Pointers		Turns on the illumination at the effect level.
Information display		Display the animation.

Note:

The pointers are stopped and illumination is turned off while cranking the engine.

Engine Start Judgement

The combination meter judges “engine-start” and activates the engine-start effect only once when the following operational conditions are all satisfied:

Operational condition
Ignition switch	ON position
Nissan Sentra Vehicle speed	Less than 0.6 mph (1 km/h)
Engine state	After cranking the engine
Setting	The setting of “Display Effect” is “On”

Note:

The engine-start effect exits when any of the above operational conditions is cancelled during the engine-start effect.

Signal Path

The combination meter judges “engine-start”, according to the following signals and activates the engine-start effect function:

Signal name	Signal source
Ignition signal	—
Engine status signal	ECM Combination meter
Nissan Sentra Vehicle speed display signal	ECM Combination meter
Starter relay status signal	IPDM E/R Combination meter

Note:

The engine-start effect function ends if any one of the above conditions is lost during the activation of this function.