Infiniti G37 Coupe. Manual - part 915

MWI-6

< FUNCTION DIAGNOSIS >

METER SYSTEM

FUNCTION DIAGNOSIS

METER SYSTEM

METER SYSTEM

METER SYSTEM : System Diagram

INFOID:0000000001606602

METER SYSTEM : System Description

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COMBINATION METER

• The combination meter retrieves the information required for controlling the operations of the meters, indica-

tor lamps/warning lamps and information display from the communication signals from the unified meter and
A/C amp. and the signals from various switches and sensors.

• The combination meter incorporates a trip computer that displays warnings and messages on the informa-

tion display according to the information received from various units.

• The combination meter incorporates a buzzer function that sounds an audible alarm with the integrated

buzzer device. Refer to 

WCS-5, "WARNING CHIME SYSTEM : System Description"

 for further details.

• The combination meter integrates the meter circuit check function and the segment check function that

checks the information display operation.

UNIFIED METER AND A/C AMP.

• Receives information required by the combination meter from various units via CAN communication line and

transmits it to the combination meter with communication line.

• The unified meter and A/C amp. incorporates a power saving control function that reduces the power con-

sumption according to the vehicle status. Refer to 

BCS-10, "System Description"

 for details.

• The unified meter and A/C amp. incorporates a diagnosis function that allows the technician to perform diag-

noses with CONSULT-III.

JSNIA0608GB

MWI

METER SYSTEM

MWI-7

< FUNCTION DIAGNOSIS >

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Between unified meter and A/C amp. and combination meter.

IPDM E/R

• IPDM E/R reads the ON/OFF signals of the oil pressure switch and transmits the oil pressure switch signal to

the unified meter and A/C amp. via BCM with the CAN communication line.

• IPDM E/R is equipped with the diagnosis function. It can perform the operation check of oil pressure warning

lamp with the auto active test and the diagnosis with CONSULT-III.

METER CONTROL FUNCTION LIST

X: Applicable

Unit

Communication line

Input from combination meter

Output to combination meter

Unified meter 
and A/C amp.

Communication line
(METER <-> AMP.)

• Parking brake switch signal 
• Washer level switch signal
• Meter day/night condition signal
• Illumination control switch signal
• Refuel status signal
• Low fuel warning lamp signal
• Odo data signal

• Vehicle speed signal
• Turn indicator signal
• High beam request signal
• Front fog light request signal
• Engine speed signal
• Fuel level sensor signal
• Engine coolant temperature signal
• A/T CHECK indicator signal
• Oil pressure switch signal
• Door switch signal
• Buzzer output signal 
• AFS OFF indicator lamp signal
• Tire pressure signal 
• VDC OFF indicator signal
• ABS warning lamp signal
• Brake warning lamp signal
• Malfunction indicator lamp signal
• 4WAS warning lamp signal
• Master warning signal

Communication line
(LCD <-> AMP.)

• Average fuel consumption reset signal
• Travel time reset signal
• Possible driving distance reset signal
• Average vehicle speed reset signal
• Select switch signal
• Enter switch signal
• Trip A/B reset switch signal
• Ambient air temperature display signal

• Shift position signal
• Meter display signal
• Door switch signal
• Trunk switch signal
• Fuel level sensor signal
• Parking brake switch signal
• Washer level switch signal
• Charge warning signal
• Instantaneous fuel consumption display 

signal

• Ambient air temperature display signal
• Average fuel consumption display signal
• Average vehicle speed display signal
• Possible driving distance display signal
• Engine speed signal
• Vehicle speed signal

System

Description

Signal source

Via unified 

meter and A/C 

amp.

Meter/gauge

Speedometer

Receives vehicle speed signal and indicates vehi-
cle speed.

ABS actuator and elec-
tric unit (control unit)

X

Tachometer

Receives engine speed signal and indicates en-
gine speed.

ECM

X

Fuel gauge

Receives fuel level sensor signal and indicates 
fuel level.

Fuel level sensor unit

X

Water temperature 
gauge

Receives engine coolant temperature signal and 
indicates coolant temperature.

ECM

X

Warning lamp/
indicator lamp

Oil pressure warning 
lamp

Receives oil pressure warning lamp signal and il-
luminates warning lamp.

IPDM E/R

X

Master warning

Illuminates according to warning output on infor-
mation display.

—

X

MWI-8

< FUNCTION DIAGNOSIS >

METER SYSTEM

Information 
display

Door open warning

Receives door switch signals and displays warn-
ing.

BCM

X

Trunk open warning

Receives trunk lid opener switch signal and dis-
plays warning.

BCM

X

Parking brake re-
lease warning

Receives parking brake switch signal and vehicle 
speed signal and displays warnings.

Parking brake switch

ABS actuator and elec-
tric unit (control unit)

X

Low fuel warning

Receives fuel gauge signal and displays warning 

if fuel level decreases to 12 

 (3-1/8 US gal, 2-5/

8 Imp gal) or less.

Fuel level sensor unit

X

Low washer fluid 
warning

Receives washer level switch signal and displays 
warning.

Washer level switch

Low outside tempera-
ture warning

Monitors ambient sensor signal and displays 
warning if ambient temperature decreases to 3

°

C 

(37

°

F) or less. (If enabled)

Ambient sensor

X

Instantaneous fuel 
consumption

Calculates instantaneous fuel consumption based 
on received vehicle speed signals and fuel con-
sumption monitor signal and displays it.

ECM

X

ABS actuator and elec-
tric unit (control unit)

X

Average fuel con-
sumption

Calculates average fuel consumption in a reset-
to-reset interval based on received vehicle speed 
signals and fuel consumption monitor signal and 
displays it.

ECM

X

ABS actuator and elec-
tric unit (control unit)

X

Average vehicle 
speed

Calculates average vehicle speed in a reset-to-re-
set interval based on received vehicle speed sig-
nals and displays it.

ABS actuator and elec-
tric unit (control unit)

X

Travel time

Displays accumulated key switch ON time from 
reset to reset.

—

X

Travel distance

Calculates accumulated travel distance in a reset-
to-reset interval based on received vehicle speed 
signals and displays it.

ABS actuator and elec-
tric unit (control unit)

X

Possible driving dis-
tance

The unified meter and A/C amp. calculates the 
possible driving distance according to the vehicle 
speed signal and the fuel level sensor unit re-
ceived with CAN communication line, and trans-
mits it to the combination meter by means of 
communication line.

ABS actuator and elec-
tric unit (control unit)

X

Fuel level sensor unit

X

Ambient air tempera-
ture

Corrects ambient air temperature value based on 
received ambient sensor signals and displays it.

Ambient sensor

X

System

Description

Signal source

Via unified 

meter and A/C 

amp.

MWI

METER SYSTEM

MWI-9

< FUNCTION DIAGNOSIS >

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ARRANGEMENT OF COMBINATION METER

JSNIA0609GB

A.

U.S.A.

B.

Canada