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.

BCM (BODY CONTROL MODULE)

BCS-3

BCS

Revision: 2005 August

2005 Murano

BCM (BODY CONTROL MODULE)

PFP:284B2

System Description

AKS00A42

BCM (Body Control Module) controls the operation of various electrical units installed on the vehicle.

BCM FUNCTION

BCM has combination switch reading function for reading the operation of combination switches (light, wiper
washer, turn signal) in addition to a function for controlling the operation of various electrical components. Also
it has an interface function allowing it to receive signals from the unified meter and A/C amp., and send signals
to ECM using CAN communication.

COMBINATION SWITCH READING FUNCTION
Description

●

BCM reads combination switch (lighting switch, wiper switch) status, and controls various electrical com-
ponent according to the results.

●

BCM reads information of a maximum of 20 switches by combining five output terminals (OUTPUT 1-5)
and five input terminals (INPUT 1-5).

Operation Description

●

BCM activates transistors of output terminals (OUTPUT 1-5) periodically, and allows current to flow in
turn.

●

If any (1 or more) switches are turned ON, circuit of output terminals (OUTPUT 1-5) and input terminals
(INPUT 1-5) becomes active.

●

At this time, transistors of output terminals (OUTPUT 1-5) are activated to allow current to flow. When volt-
age of input terminals (INPUT 1-5) corresponding to that switch changes, interface in BCM detects volt-
age change, and BCM determines that switch is ON.

SKIA4958E

BCS-4

BCM (BODY CONTROL MODULE)

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2005 Murano

Operation Table of BCM and Combination Switches

●

BCM reads operation status of combination switch using combinations shown in table below.

NOTE:
Headlamp has a dual system switch.

SKIA4959E

BCM (BODY CONTROL MODULE)

BCS-5

BCS

Revision: 2005 August

2005 Murano

Sample Operation: (When Lighting Switch 1ST Position Turned ON)

●

When lighting switch 1ST position is turned ON, contact in combination switch turns ON. At this time if
OUTPUT 4 transistor is activated, BCM detects that voltage changes in INPUT 5.

●

When OUTPUT 4 transistor is ON, BCM detects that voltage changes in INPUT 5, and judges that lighting
switch 1ST position is ON. Then BCM sends tail lamp ON signal to IPDM E/R using CAN communication.

●

When OUTPUT 4 transistor is activated again, BCM detects that voltage changes in INPUT 5, and recog-
nizes that lighting switch 1ST position is continuously ON.

NOTE:
Each OUTPUT terminal transistor is activated at 10 ms intervals. Therefore after switch is turned ON,
electrical loads are activated with time delay. But this time delay is so short that it cannot be detected by
human senses.

SKIA4960E

BCS-6

BCM (BODY CONTROL MODULE)

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2005 Murano

Operation Mode

Combination switch reading function has operation modes shown below.

Normal status

●

When BCM is not in sleep status, OUTPUT terminals (1-5) send out ON signal every 10 ms.

Sleep status

●

When BCM is in sleep status, transistors of OUTPUT 1 and 5 stop the output, and BCM enters low
power mode. Mean while OUTPUT 2, 3, and 4 send out ON signal every 60 ms, and accept input from
lighting switch system.

CAN COMMUNICATION CONTROL

CAN communication allows a high rate of information transmission through the two communication lines (CAN
L line, CAN H line) connecting the various control units in the system. Each control unit transmits/receives
data but selectively reads required data only. For details of signals that are transmitted/received by BCM via
CAN communication, refer to

LAN-29, "CAN Communication Unit"

PKIB6124E

BCM (BODY CONTROL MODULE)

BCS-7

BCS

Revision: 2005 August

2005 Murano

BCM STATUS CONTROL

BCM changes its status depending on the operation status in order to save power consumption.

CAN communication status

●

With ignition switch ON, CAN communicates with other control units normally.

●

Control by BCM is being operated properly.

●

When ignition switch is OFF, switching to sleep mode is possible.

●

Even when ignition switch is OFF, if CAN communication with IPDM E/R and combination meter is
active, CAN communication status is active.

Sleep transient status

●

This status shuts down CAN communication when ignition switch is turned OFF.

●

It transmits sleep request signal to IPDM E/R and combination meter.

●

Two seconds after CAN communication of all control units stops, sleep transient status is switched to
CAN communication inactive status.

CAN communication inactive status

●

With ignition switch OFF, CAN communication is not active.

●

With ignition switch OFF, control performed only by BCM is active.

●

Three seconds after CAN communication of all control units stops, CAN communication inactive status
is switched to sleep status.

Sleep status

●

BCM is activated with low power mode.

●

CAN communication is not active.

●

When CAN communication operation is detected, it switches to CAN communication status.

●

When a state of the following switches changes, it switches to CAN communication state.

–

Key switch

–

Hazard switch

–

Door lock/unlock switch

–

Front door switch (driver side, passenger side)

–

Rear door switch (LH, RH)

–

Back door opener switch

–

Combination switch (passing, lighting switch 1ST position, front fog lamp)

–

Key fob (lock/unlock signal)

–

Key cylinder switch

●

When control performed only by BCM is required by switch, it shifts to CAN communication inactive
mode.

●

Status of combination switch reading function is changed.

BCS-8

BCM (BODY CONTROL MODULE)

Revision: 2005 August

2005 Murano

SYSTEMS CONTROLLED BY BCM DIRECTLY

NOTE:
Power supply only. No system control.

SYSTEMS CONTROLLED BY BCM AND IPDM E/R

SYSTEMS CONTROLLED BY BCM AND COMBINATION METER

SYSTEMS CONTROLLED BY BCM AND INTELLIGENT KEY UNIT

System

Reference

Power door lock

BL-23, "POWER DOOR LOCK SYSTEM"

Remote keyless entry

BL-59, "REMOTE KEYLESS ENTRY SYSTEM"

Power window

NOTE

GW-17, "POWER WINDOW SYSTEM"

Sunroof

NOTE

RF-10, "SUNROOF"

Power seat

NOTE

SE-93, "POWER SEAT"

Room lamp timer

LT-175, "INTERIOR ROOM LAMP"

Warning chime

DI-60, "WARNING CHIME"

Rear wiper

WW-38, "REAR WIPER AND WASHER SYSTEM"

System

Reference

Panic alarm

BL-59, "REMOTE KEYLESS ENTRY SYSTEM"

Theft warning

BL-205, "VEHICLE SECURITY (THEFT WARNING) SYSTEM"

NVIS (NATS)

BL-234, "NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS)"

Headlamp, tail lamp, Battery saver control,
day time light system

●

LT-6, "HEADLAMP - XENON TYPE -"

●

LT-39, "HEADLAMP -CONVENTIONAL TYPE-"

●

LT-69, "DAYTIME LIGHT SYSTEM"

Auto light system

LT-88, "AUTO LIGHT SYSTEM"

Fog lamp

LT-110, "FRONT FOG LAMP"

Front wiper

WW-4, "FRONT WIPER AND WASHER SYSTEM"

Rear window defogger

GW-75, "REAR WINDOW DEFOGGER"

System

Reference

Warning chime

DI-60, "WARNING CHIME"

Turn signal and hazard warning lamps

LT-123, "TURN SIGNAL AND HAZARD WARNING LAMPS"

System

Reference

Intelligent key

BL-88, "INTELLIGENT KEY SYSTEM"

BCM (BODY CONTROL MODULE)

BCS-9

BCS

Revision: 2005 August

2005 Murano

MAJOR COMPONENTS AND CONTROL SYSTEM

System

Input

Output

Remote control entry system

key fob

●

All-door locking actuator

●

Turn signal lamp (LH, RH)

Intelligent key system

Intelligent key unit

●

All-door locking actuator

●

Fuel lid lock actuator

●

Turn signal lamp (LH, RH)

●

Combination meter

Power door lock system

●

Power window main switch
(door lock and unlock switch)

●

Power window sub switch (passenger side)
(door lock and unlock switch)

All-door locking actuator

Power supply (IGN) to power window, sunroof

Ignition power supply

Power window and sunroof system

Power supply (BAT) to power window, sunroof
and power seat

Battery power supply

Power window, sunroof system and
power seat

Panic alarm

●

Key switch

●

Key fob

IPDM E/R

Theft warning system

●

All-door switch

●

Key fob

●

Power window main switch (door lock and
unlock switch)

●

IPDM E/R

●

Security indicator lamp

Auto light system

●

Optical sensor

●

Combination switch

IPDM E/R

Battery saver control

●

Ignition switch

●

Combination switch

IPDM E/R

Headlamp

Combination switch

IPDM E/R

Day time light system

●

Engine status signal

●

Ignition switch

●

Combination switch

IPDM E/R

Tail lamp

Combination switch

IPDM E/R

Fog lamp

Combination switch

IPDM E/R

Turn signal lamp

Combination switch

●

Turn signal lamp

●

Combination meter

Hazard lamp

Hazard switch

●

Turn signal lamp

●

Combination meter

Room lamp timer

●

Key switch

●

Key fob

●

Power window main switch (door lock and
unlock switch)

●

Front door switch driver side

●

All-door switch

Interior room lamp

Key warning chime

●

Key switch

●

Front door switch driver side

Combination meter
(warning buzzer)

Light warning chime

●

Combination switch

●

Key switch

●

Front door switch driver side

Combination meter
(warning buzzer)

Seat belt warning chime

●

Combination meter (Seat belt buckle
(driver side) switch)

●

Ignition switch

Combination meter
(warning buzzer)

BCS-10

BCM (BODY CONTROL MODULE)

Revision: 2005 August

2005 Murano

CAN Communication Unit

AKS00AOG

Refer to

LAN-29, "CAN Communication Unit"

Vehicle-speed-sensing intermittent wiper

●

Combination switch

●

Combination meter

IPDM E/R

Rear intermittent wiper

Combination switch

Rear wiper motor

Rear window defogger

●

Rear window defogger switch

●

Ignition switch

IPDM E/R

A/C switch signal

Unified meter and A/C amp.

ECM

Blower fan switch signal

Unified meter and A/C amp.

ECM

System

Input

Output

BCM (BODY CONTROL MODULE)

BCS-11

BCS

Revision: 2005 August

2005 Murano

Schematic

AKS00A45

TKWB0499E

BCS-12

BCM (BODY CONTROL MODULE)

Revision: 2005 August

2005 Murano

TKWB0500E

BCM (BODY CONTROL MODULE)

BCS-13

BCS

Revision: 2005 August

2005 Murano

CONSULT-II Function (BCM)

AKS00A46

CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.

CONSULT–II INSPECTION PROCEDURE

CAUTION:

If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carry out CAN communication.

With the ignition switch OFF, connect CONSULT-II and CON-
SULT-II CONVERTER to the data link connector, then turn the
ignition switch ON.

Touch “START (NISSAN BASED VHCL)”.

Touch “BCM” on “SELECT SYSTEM” screen.
If “BCM” is not indicated, go to

GI-39, "CONSULT-II Data Link

Connector (DLC) Circuit"

BCM diagnostic test item

Check item, diagnostic test mode

Content

Inspection by part

WORK SUPPORT

Changes setting of each function.

SELF-DIAG RESULTS

BCM performs self-diagnosis of CAN communication.

DATA MONITOR

Displays the input data of BCM in real time.

CAN DIAG SUPPORT MNTR

The result of transmit/receive diagnosis of CAN communication can
be read.

ACTIVE TEST

Gives a drive signal to a load to check the operation.

ECU PART NUMBER

ECM part number can be read.

CONFIGURATION

(Not be used.)

PBIB1300E

BCIA0029E

BCIA0030E

BCS-14

BCM (BODY CONTROL MODULE)

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2005 Murano

Select the desired part to be diagnosed on the “SELECT TEST
ITEM” screen.

ITEMS OF EACH PART

NOTE:
CONSULT-II displays systems equipped in the vehicle.

:Applicable

NOTE:
*1: This item is displayed, but should not be used.
*2: This item is displayed, but does not function.

PKIA5226E

System and item

CONSULT-II display

Diagnostic test mode (Inspection by part)

WORK

SUPPORT

SELF

−

DIAG

RESULTS

DATA

MONI-

TOR

CAN

DIAG
SUP-

PORT

MNTR

ACTIVE

TEST

ECU

PART

NUMBER

CONFIG-

URATION

BCM

Power door lock system

DOOR LOCK

Rear window defogger

REAR DEFOGGER

Warning chime

BUZZER

Room lamp timer

INT LAMP

Headlamp

HEAD LAMP

Wiper

WIPER

Turn signal lamp
Hazard lamp

FLASHER

Blower fan switch signal
A/C switch signal

AIR CONDITONER

Intelligent Key system

INTELLIGENT KEY

Combination switch

COMB SW

NVIS

IMMU

Room lamp battery saver

BATTERY SAVER

Trunk lid

TRUNK

Vehicle security system

THEFT ALM

Retained power control

RETAINED PWR

Oil pressure switch

SIGNAL BUFFER

Panic system

PANIC ALARM

BCM (BODY CONTROL MODULE)

BCS-15

BCS

Revision: 2005 August

2005 Murano

WORK SUPPORT
Operation Procedure

Touch “BCM” on “SELECT TEST ITEM” screen.

Touch “WORK SUPPORT” on “SELECT DIAG MODE” screen.

Touch item on “SELECT WORK ITEM” screen.

Touch “START”.

Touch “CHANGE SET”.

The setting will be changed and “RESETTING COMPLETED” will be displayed.

Touch “END”.

Display Item List

CAN Communication Inspection Using CONSULT-II (Self-Diagnosis)

AKS00A47

CHECK SELF-DIAGNOSTIC RESULT

CAUTION:

If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carry out CAN communication.

Connect to CONSULT-II, and select “BCM” on “SELECT SYSTEM” screen.

Select “BCM control unit ” on “SELECT WORK ITEM” screen, and select “SELF-DIAG RESULTS”.

Check display content in self-diagnostic results.

Contents displayed

No malfunction>>INSPECTION END
Malfunction in CAN communication system>>After printing the monitor items, go to “CAN System”. Refer to

LAN-5, "Precautions When Using CONSULT-II"

Item

Description

RESET SETTING VALUE

Return a value set with WORK SUPPORT of each system to a default value in factory shipment.

CONSULT-II display code

Diagnosis item

U1000

INITIAL DIAG

TRANSMIT DIAG

ECM

IPDM E/R

METER / M&A

I - KEY

BCS-16

BCM (BODY CONTROL MODULE)

Revision: 2005 August

2005 Murano

Removal and Installation of BCM

AKS00AAE

REMOVAL

Remove the Instrument driver lower panel. Refer to

IP-11,

"Removal and Installation"

in “IP INSTRUMENT PANEL”.

Disconnect BCM connector.

Remove screws (2) to remove BCM.

INSTALLATION

Installation is the reverse order of removal.

NOTE:
When replacing BCM perform initialization of NATS system and registration of all NATS ignition key IDs.

SKIA4038E

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