The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.

WARNING:

●

To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer.

●

Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.

●

Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.

Wiring Diagrams and Trouble Diagnosis

AKS004FT

When you read wiring diagrams, refer to the following:

●

Refer to

GI-14, "How to Read Wiring Diagrams"

●

Refer to

PG-3, "POWER SUPPLY ROUTING CIRCUIT"

for power distribution circuit.

When you perform trouble diagnosis, refer to the following:

●

Refer to

GI-10, "HOW TO FOLLOW TEST GROUPS IN TROUBLE DIAGNOSES"

●

Refer to

GI-26, "How to Perform Efficient Diagnosis for an Electrical Incident"

DI-4

COMBINATION METERS

Revision; 2004 April

2003 Murano

COMBINATION METERS

PFP:24814

System Description

AKS004FU

UNIFIED METER CONTROL UNIT

●

Speedometer, odo/trip meter, tachometer, fuel gauge and water temperature gauge are controlled by the
unified meter control unit, which is built into the combination meter. Unified meter control unit receives sig-
nals from unified meter and A/C amp.

●

Warning lamp and indicator lamp of combination meter are controlled by signals drawn from the unified
meter and A/C amp.

●

Digital meter is adopted for odo/trip meter.*
*The record of the odo meter is kept even if the battery cable is disconnected. The record of the trip meter
is erased when the battery cable is disconnected.

●

Odo/trip meter and CVT indicator segments can be checked in diagnosis mode.

●

Meters/gauges can be checked in diagnosis mode.

Illumination Control

The unified meter control unit outputs the odo/trip meter and CVT
indicator lighting when the ignition switch is turned on. When the
lighting switch is turned on, light on for the combination meter dial,
odo/trip meter and illumination control switch and external lighting
are output. In addition, when the lighting switch is turned on, the illu-
mination control switch on the left side of the combination meter can
be used to adjust the brightness of each light. The brightness can be
adjusted to sixteen different levels: From 0 (no lights) to 15 (maxi-
mum). Pressing the illumination control switch will brighten or darken
the lights. When the key switch is in the START position, the combi-
nation meter dial lighting and illumination control switch lighting are
turned off.

UNIFIED METER AND A/C AMP.

Refer to

DI-32, "System Description"

in “UNIFIED METER AND A/C AMP”.

PKIA2478E

COMBINATION METERS

DI-5

Revision; 2004 April

2003 Murano

HOW TO CHANGE THE DISPLAY FOR ODO/TRIP METER

●

The vehicle speed signal and the memory signals from the meter memory circuit are processed by the
combination meter and the mileage is displayed.

●

Depressing the odo/trip meter switch toggles the mode in the following order.

●

The odo/trip meter display mode toggling and trip display reset-
ting can be identified by the amount of time that elapses from
pressing the odo/trip meter switch to releasing it.

●

When resetting with trip A displayed, only trip A display is reset
(Trip B operates the same way).

SEL175W

PKIA2480E

DI-6

COMBINATION METERS

Revision; 2004 April

2003 Murano

POWER SUPPLY AND GROUND CIRCUIT

Power is supplied at all times

●

through 10A fuse [No. 19, located in the fuse block (J/B)]

●

to unified meter and A/C amp. terminal 21

●

through 10A fuse [No. 21, located in the fuse block (J/B)]

●

to combination meter terminal 21.

With the ignition switch in the ON or START position, power is supplied

●

through 10A fuse [No. 14, located in the fuse block (J/B)]

●

to combination meter terminal 20

●

through 10A fuse [No. 12, located in the fuse block (J/B)]

●

to unified meter and A/C amp. terminal 22.

With the ignition switch in the ON position, power is supplied

●

through 15A fuse [No. 10, located in the fuse block (J/B)], and

●

through 15A fuse [No. 11, located in the fuse block (J/B)]

●

to unified meter and A/C amp. terminal 46.

Ground is supplied

●

to combination meter terminals 22, 23 and 24, and

●

to unified meter and A/C amp. terminals 29 and 30

●

through body grounds M14 and M78.

WATER TEMPERATURE GAUGE

The water temperature gauge indicates the engine coolant temperature.
ECM provides a engine coolant temperature signal to unified meter and A/C amp. with CAN communication
line. Unified meter and A/C amp. provides a water temperature signal to combination meter for water temper-
ature gauge with communication line between unified meter and A/C amp. and combination meter.

TACHOMETER

The tachometer indicates engine speed in revolutions per minute (rpm).
ECM provides an engine speed signal to unified meter and A/C amp. with CAN communication line. Unified
meter and A/C amp. provides an engine speed signal to combination meter for tachometer with communica-
tion line between unified meter and A/C amp. and combination meter.

FUEL GAUGE

The fuel gauge indicates the approximate fuel level in the fuel tank.
The fuel gauge is regulated by a variable ground signal supplied

●

from unified meter and A/C amp. terminal 36

●

through the fuel level sensor unit and fuel pump (main) terminals 5 and 7, and

●

through the fuel level sensor unit (sub), and

●

through the fuel level sensor unit and fuel pump (main) terminals 6 and 2

●

to unified meter and A/C amp. terminal 28 for the fuel gauge.

Unified meter and A/C amp. provides an fuel level signal to combination meter for fuel gauge with communica-
tion line between unified meter and A/C amp. and combination meter.

SPEEDOMETER

ABS actuator and electric unit (control unit) provides a vehicle speed signal to the unified meter and A/C amp.
with CAN communication line. After unified meter and A/C amp. received the vehicle speed signal, it changes
the signal to 8 pulse signal and provides the 8 pulse signal to the combination meter for the speedometer.

COMBINATION METERS

DI-7

Revision; 2004 April

2003 Murano

Component Parts and Harness Connector Location

AKS004FV

PKIA2477E

DI-8

COMBINATION METERS

Revision; 2004 April

2003 Murano

Combination Meter

AKS004FW

CHECK

PKIA2479E

COMBINATION METERS

DI-9

Revision; 2004 April

2003 Murano

Circuit Diagram

AKS004FX

TKWA0814E

DI-10

COMBINATION METERS

Revision; 2004 April

2003 Murano

Wiring Diagram — METER —

AKS004FY

TKWA1157E

COMBINATION METERS

DI-11

Revision; 2004 April

2003 Murano

TKWA0816E

DI-12

COMBINATION METERS

Revision; 2004 April

2003 Murano

Terminals and Reference Value for Combination Meter

AKS004FZ

Terminal

No.

Wire

color

Item

Measuring condition

Reference value (V)

Ignition

switch

Operation or condition

V/W

Vehicle speed signal (8-pulse)

Speedometer operated
[When vehicle speed is
approx. 40 km/h (25 MPH)]

R/W

Illumination signal

Lighting switch ON, then
operate the illumination
control switch.

<e.g.> When brightness level is midway.

Lighting switch OFF

Approx. 0

R/L

TX communication line (To
unified meter and A/C amp.)

—

R/B

RX communication line (From
unified meter and A/C amp.)

—

Ignition switch ON or START

—

Battery voltage

Y/R

Battery power supply

OFF

—

Battery voltage

Ground

—

Approx. 0

—

Illumination control switch (+)

—

Refer to

DI-27, "Odo/Trip Meter and Illu-

mination Control Switch Inspection"

—

Illumination control switch (–)

—

Odo/trip meter switch

—

Odo/trip meter and illumination
control switch ground

—

PKIA1935E

SKIA5872E

SKIA3361E

SKIA3362E

COMBINATION METERS

DI-13

Revision; 2004 April

2003 Murano

Terminals and Reference Value for Unified Meter and A/C Amp.

AKS004G0

Terminal

No.

Wire

color

Item

Measuring condition

Reference value (V)

Ignition

switch

Operation or condition

CAN H

—

R/B

TX communication line (To
combination meter)

—

CAN L

—

R/L

RX communication line (From
combination meter)

—

Y/R

Battery power supply

OFF

—

Battery voltage

Ignition switch ON or START

—

Battery voltage

V/W

Vehicle speed signal (8-pulse)

Speedometer operated
[When vehicle speed is
approx. 40 km/h (25 MPH)]

G/B

Fuel level sensor signal

—

Refer to

DI-29, "FUEL LEVEL SEN-

SOR UNIT CHECK"

Ground (For power)

—

Approx. 0

Ground

—

Approx. 0

B/W

Fuel level sensor signal
ground

—

W/L

Ignition switch ON

—

Battery voltage

SKIA3362E

SKIA3361E

PKIA1935E

DI-14

COMBINATION METERS

Revision; 2004 April

2003 Murano

Meter/Gauge Operation and Odo/Trip Meter

AKS004G1

SELF-DIAGNOSIS FUNCTION

●

Odo/trip meter segment and CVT indicator segment operation can be checked in self-diagnosis mode.

●

Meters/gauges can be checked in self-diagnosis mode.

HOW TO ALTERNATE DIAGNOSIS MODE

Turn ignition switch ON, and switch the odo/trip meter to “trip A” or “trip B”.

NOTE:
If the diagnosis function is activated with the trip meter A displayed, the mileage on the trip meter A will
indicate 0000.0 miles, but the actual trip mileage will be retained. (Trip B operates the same way.)

Turn ignition switch OFF.

While pushing the odo/trip meter switch, turn ignition switch ON
again.

Make sure the trip meter displays “0000.0”.

Push the odo/trip meter switch at least 3 times. (Within 7 sec-
onds after the ignition switch is turned ON.)

All the segments on the odo/trip meter and CVT indicator illuminate, and simultaneously the low-fuel
warning lamp indicator illuminates. At this time, the unified meter control unit is turned to diagnosis mode.

Push the odo/trip meter switch. Each meter/gauge should indi-
cate as shown in the figure while pushing odo/trip meter switch.
(At this time, the low-fuel warning lamp goes off.)

CONSULT-II Function

AKS004G2

Refer to

DI-57, "CONSULT-II Function"

in “UNIFIED METER AND A/C AMP”.

PKIA2480E

SKIA4428E

PKIA2482E

COMBINATION METERS

DI-15

Revision; 2004 April

2003 Murano

How to Proceed With Trouble Diagnosis

AKS004G3

Confirm the symptom or customer complaint.

Perform diagnosis according to diagnosis flow. Refer to

DI-15, "Diagnosis Flow"

According to the symptom chart, repair or replace the cause of the symptom.

Does the meter operate normally? If so, go to 5. If not, go to 2.

INSPECTION END

Diagnosis Flow

AKS004G4

CHECK SELF-DIAGNOSTIC RESULTS OF UNIFIED METER AND A/C AMP.

Start engine.

Select “METER A/C AMP” on CONSULT-II, and perform self-diagnosis of unified meter and A/C amp.
Refer to

DI-57, "CONSULT-II Function"

After erasing the self-diagnosis result, perform self-diagnosis again.

Self-diagnostic results content

No malfunction detected>>GO TO 2.
Malfunction detected>> Go to

DI-18, "Symptom Chart 2"

CHECK WARNING LAMP ILLUMINATION

Turn ignition switch ON.

Make sure warning lamps (such as malfunction indicator lamp and oil pressure warning lamp) illuminate.

Do warning lamps illuminate?

YES

>> GO TO 3.

>> Check ignition power supply system of combination meter. Refer to

DI-16, "Power Supply and

Ground Circuit Inspection"

CHECK SELF-DIAGNOSIS OPERATION OF COMBINATION METER

Perform combination meter self-diagnosis. Refer to

DI-14, "SELF-DIAGNOSIS FUNCTION"

Does self-diagnosis function operate?

YES

>> GO TO 4.

>> Check the following.

●

Battery power supply of combination meter and ground circuit. Refer to

DI-16, "Power Supply

and Ground Circuit Inspection"

●

Odo/trip meter switch. Refer to

DI-27, "Odo/Trip Meter and Illumination Control Switch Inspec-

tion"

CHECK ODO/TRIP METER OPERATION

Check segment display status of odo/trip meter.

Is the display normal?

YES

>> GO TO 5.

>> Replace combination meter.

SEL176W

DI-16

COMBINATION METERS

Revision; 2004 April

2003 Murano

CHECK LOW-FUEL WARNING LAMP ILLUMINATION CONFIRMATION

During low-fuel warning lamp check, confirm illumination of low-fuel warning lamp.

OK or NG

>> GO TO 6.

>> Replace combination meter.

CHECK COMBINATION METER CIRCUIT

Check indication of each meter/gauge in self-diagnosis mode.

OK or NG

>> Go to

DI-18, "Symptom Chart 1"

>> Replace combination meter.

Power Supply and Ground Circuit Inspection

AKS004G5

CHECK FUSE

Check for blown combination meter and unified meter and A/C amp. fuses.

Refer to

DI-10, "Wiring Diagram — METER —"

OK or NG

>> GO TO 2.

>> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse. Refer to

PG-

3, "POWER SUPPLY ROUTING CIRCUIT"

Condition of odo/trip meter switch

Low-fuel warning lamp

Pushed

Does not illuminate.

Released

Illuminates.

PKIA2482E

Unit

Power source

Fuse No.

Combination meter

Battery

Unified meter and A/C amp.

Battery

Combination meter

Ignition switch ON or START

Unified meter and A/C amp.

Ignition switch ON or START

Ignition switch ON

10, 11

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