Nissan Murano Z51 (2008 year). Manual

PCS-36

< BASIC INSPECTION >

[POWER DISTRIBUTION SYSTEM]

DIAGNOSIS AND REPAIR WORK FLOW

GET INFORMATION ABOUT SYMPTOM

Get the detailed information from the customer about the symptom (the condition and the environment when
the incident/malfunction occurred).

>> GO TO 2.

CHECK DTC

Check DTC for BCM and IPDM E/R.

Perform the following procedure if DTC is detected.

Record DTC and freeze frame data (Print them out with CONSULT-III.)

Erase DTC.

Study the relationship between the cause detected by DTC and the symptom described by the customer.

Check related service bulletins for information.

Is any symptom described and any DTC detected?

Symptom is described, DTC is detected>>GO TO 3.
Symptom is described, DTC is not detected>>GO TO 4.
Symptom is not described, DTC is detected>>GO TO 5.

CONFIRM THE SYMPTOM

Confirm the symptom described by the customer.
Connect CONSULT-III to the vehicle in “DATA MONITOR” mode and check real time diagnosis results.
Verify relation between the symptom and the condition when the symptom is detected.

>> GO TO 5.

CONFIRM THE SYMPTOM

Confirm the symptom described by the customer.
Connect CONSULT-III to the vehicle in “DATA MONITOR ” mode and check real time diagnosis results.
Verify relation between the symptom and the condition when the symptom is detected.

>> GO TO 6.

PERFORM DTC CONFIRMATION PROCEDURE

Perform DTC Confirmation Procedure for the detected DTC, and then check that DTC is detected again.
At this time, always connect CONSULT-III to the vehicle, and check diagnostic results in real time.
If two or more DTCs are detected, refer to

SEC-209, "DTC Inspection Priority Chart"

, and determine trouble

diagnosis order.
NOTE:
Perform Component Function Check if DTC Confirmation Procedure is not included in Service Manual. This
simplified check procedure is an effective alternative though DTC cannot be detected during this check.
If the result of Component Function Check is NG, it is the same as the detection of DTC by DTC Confirmation
Procedure.
Is DTC detected?

YES

>> GO TO 7.

>> Refer to

GI-40, "Intermittent Incident"

DETECT MALFUNCTIONING SYSTEM BY SYMPTOM DIAGNOSIS

Detect malfunctioning system according to SYMPTOM DIAGNOSIS based on the confirmed symptom in step
4, and determine the trouble diagnosis order based on possible causes and symptom.

>> GO TO 7.

DETECT MALFUNCTIONING PART BY DIAGNOSTIC PROCEDURE

Inspect according to Diagnostic Procedure of the system.
NOTE:
The Diagnostic Procedure described based on open circuit inspection. A short circuit inspection is also
required for the circuit check in the Diagnostic Procedure.

Revision: 2008 October

2009 Murano

PCS

DIAGNOSIS AND REPAIR WORK FLOW

PCS-37

< BASIC INSPECTION >

[POWER DISTRIBUTION SYSTEM]

Is malfunctioning part detected?

YES

>> GO TO 8.

>> Check voltage of related BCM terminals using CONSULT-III.

REPAIR OR REPLACE THE MALFUNCTIONING PART

Repair or replace the malfunctioning part.

Reconnect parts or connectors disconnected during Diagnostic Procedure again after repair and replace-
ment.

Check DTC. If DTC is detected, erase it.

>> GO TO 9.

FINAL CHECK

When DTC was detected in step 2, perform DTC Confirmation Procedure or Component Function Check
again, and then check that the malfunction has been repaired securely.
When symptom was described from the customer, refer to confirmed symptom in step 3 or 4, and check that
the symptom is not detected.

Does the symptom reappear?

YES (DTC is detected)>>GO TO 7.
YES (Symptom remains)>>GO TO 6.
NO

>> INSPECTION END

Revision: 2008 October

2009 Murano

PCS-38

< FUNCTION DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

POWER DISTRIBUTION SYSTEM

FUNCTION DIAGNOSIS

POWER DISTRIBUTION SYSTEM

System Description

INFOID:0000000003375857

SYSTEM DESCRIPTION

• PDS (POWER DISTRIBUTION SYSTEM) is the system that BCM controls with the operation of the push-

button ignition switch and performs the power distribution to each power circuit. This system is used instead
of the mechanical power supply changing mechanism with the operation of the conventional key cylinder.

• The push-button ignition switch can be operated when Intelligent Key is in the following condition. Refer to

Engine Start Function for details. (With Intelligent key system)

- Intelligent Key is in the detection area of the inside key antenna
- Insert Intelligent Key into the key slot
• The push-button ignition switch can be operated when keyfob is in the following condition. Refer to Engine

Start Function for details. (Without Intelligent key system)

- Insert keyfob into the key slot
• The push-button ignition switch operation is input to BCM as a signal. BCM changes the power supply posi-

tion according to the status and operates the following relays to supply power to each power circuit.

- Ignition relay (inside IPDM E/R)
- Ignition relay (inside fuse block)
- ACC relay
- Blower relay

NOTE:
The engine switch operation changes due to the conditions of brake pedal, selector lever and vehicle speed.

• The power supply position can be confirmed with the lighting of the indicators around the push-button igni-

tion switch.

BATTERY SAVER SYSTEM

When all the following conditions are met for 60 minutes, the battery saver system will cut off the power supply
to prevent battery discharge.
• The ignition switch is in the ACC position
• All doors are closed
• Selector lever is in the P position

Reset Condition of Battery Saver System

In order to prevent the battery from discharging, the battery saver system will cut off the power supply when all
doors are closed, the selector lever is on P position and the ignition switch is left on ACC position for 60 min-
utes. If any of the following conditions are met the battery saver system is released and the steering will
change automatically to lock position from OFF position.
• Opening any door
• Operating with door key cylinder on door lock
• Operating with door request switch on door lock (With Intelligent Key system)
• Operating with Intelligent Key on door lock (With Intelligent Key system)
• Operating with keyfob on door lock (Without Intelligent Key system)
Press push-button ignition switch and ignition switch will change to ACC position from OFF position.

STEERING LOCK OPERATION

Steering is locked by steering lock unit when ignition switch is in the OFF position, selector lever is in the P
position and any of the following conditions are met.
• Opening door
• Closing door
• Door is locked with request switch (With Intelligent Key system)
• Door is locked with Intelligent Key (With Intelligent key system)
• Door is locked with keyfob (Without Intelligent Key system)

POWER SUPPLY POSITION CHANGE TABLE BY PUSH-BUTTON IGNITION SWITCH OPERA-
TION

The power supply position changing operation can be performed with the following operations.
NOTE:
• When an Intelligent Key is within the detection area of inside key antenna and when it is inserted to the key

slot, it is equivalent to the operations below. (With Intelligent Key system)

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PCS

POWER DISTRIBUTION SYSTEM

PCS-39

< FUNCTION DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

• When keyfob is inserted to the key slot, it is equivalent to the operation below. (Without Intelligent Key sys-

tem)

• When starting the engine, the BCM monitors under the engine start conditions,
- Brake pedal operating condition
- Selector lever position
- Vehicle speed

Vehicle speed: less than 4 km/h (2.5 MPH)

Vehicle speed: 4 km/h (2.5 MPH) or more

Emergency stop operation

• Press and hold the push-button ignition switch for 2 seconds or more.

• Press the push-button ignition switch 3 times or more within 1.5 seconds.

Power supply position

Engine start/stop condition

Push-button ignition switch

operation frequency

Selector lever

Brake pedal operation condi-

tion

LOCK

→

ACC

—

Not depressed

LOCK

→

ACC

→

—

Not depressed

LOCK

→

ACC

→

OFF

—

Not depressed

LOCK

→

START

ACC

→

START

→

START

P or N position

Depressed

Engine is running

→

OFF

—

Power supply position

Engine start/stop condition

Push-button ignition switch

operation frequency

Selector lever

Brake pedal operation condi-

tion

Engine is running

→

ACC

—

Emergency stop operation

Engine stall return operation while
driving

N position

Not depressed

Revision: 2008 October

2009 Murano

PCS-40

< FUNCTION DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

POWER DISTRIBUTION SYSTEM

Component Parts Location

INFOID:0000000003375858

Component Description

INFOID:0000000003375859

JMMIA0009ZZ

BCM M118, M119, M121, M122, M123 2.

TCM F23

IPDM E/R E10, E11, F12

Push-button ignition switch M101

Combination meter (Key warning
lamp) M34

Stop lamp switch
E115 (TYPE A)
E116 (TYPE B)

Behind the combination meter

Engine room dash panel (LH)

Behind the instrument lower panel LH

Component

Reference

IPDM E/R

PCS-6

Ignition relay (built into IPDM E/R)

PCS-17

Ignition relay (inserted into fuse block)

Accessory relay

Blower relay

Stop lamp switch

Park/neutral position switch

SEC-65

Push-button ignition switch

PCS-66

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PCS

DIAGNOSIS SYSTEM (BCM)

PCS-41

< FUNCTION DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

DIAGNOSIS SYSTEM (BCM)

COMMON ITEM

COMMON ITEM : CONSULT-III Function (BCM - COMMON ITEM)

INFOID:0000000004757251

APPLICATION ITEM

CONSULT-III performs the following functions via CAN communication with BCM.

SYSTEM APPLICATION

BCM can perform the following functions for each system.
NOTE:
It can perform the diagnosis modes except the following for all sub system selection items.

: Applicable item

NOTE:

• *1: At models with Intelligent Key system this item is displayed, but is not used.

• *2: At models with rain sensor this mode is displayed, but is not used.

Diagnosis mode

Function Description

Work Support

Changes the setting for each system function.

Self Diagnostic Result

Displays the diagnosis results judged by BCM.

CAN Diag Support Monitor

Monitors the reception status of CAN communication viewed from BCM. Refer to CONSULT-III opera-
tion manual.

Data Monitor

The BCM input/output signals are displayed.

Active Test

The signals used to activate each device are forcibly supplied from BCM.

Ecu Identification

The BCM part number is displayed.

Configuration

• Read and save the vehicle specification.
• Write the vehicle specification when replacing BCM.

System

Sub system selection item

Diagnosis mode

Work Support

Data Monitor

Active Test

Door lock

DOOR LOCK

Rear window defogger

REAR DEFOGGER

Warning chime

BUZZER

Interior room lamp timer

INT LAMP

Remote keyless entry system

MULTI REMOTE ENT*

Exterior lamp

HEAD LAMP

Wiper and washer

WIPER

Turn signal and hazard warning lamps

FLASHER

—

AIR CONDITONER*

• Intelligent Key system
• Engine start system

INTELLIGENT KEY

Combination switch

COMB SW

Body control system

BCM

NVIS - NATS

IMMU

Interior room lamp battery saver

BATTERY SAVER

Back door opener system

TRUNK

Vehicle security system

THEFT ALM

RAP system

RETAINED PWR

Signal buffer system

SIGNAL BUFFER

TPMS

TPMS (AIR PRESSURE MONITOR)

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PCS-42

< FUNCTION DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

DIAGNOSIS SYSTEM (BCM)

• *3: This item is displayed, but is not used.

FREEZE FRAME DATA (FFD)

The BCM records the following vehicle condition at the time a particular DTC is detected, and displays on
CONSULT-III.

INTELLIGENT KEY

INTELLIGENT KEY : CONSULT-III Function (BCM - INTELLIGENT KEY)

INFOID:0000000004757252

BCM CONSULT-III FUNCTION

CONSULT-III performs the following functions via CAN communication with BCM.

CONSULT screen item

Indication/Unit

Description

Vehicle Speed

km/h

Vehicle speed of the moment a particular DTC is detected

Odo/Trip Meter

Total mileage (Odometer value) of the moment a particular DTC is detected

Vehicle Condition

SLEEP>LOCK

Power position status of
the moment a particular
DTC is detected

While turning BCM status from low power consumption mode to
normal mode (Power supply position is “LOCK”)

SLEEP>OFF

While turning BCM status from low power consumption mode to
normal mode (Power supply position is “OFF”.)

LOCK>ACC

While turning power supply position from “LOCK” to “ACC”

ACC>ON

While turning power supply position from “ACC” to “IGN”

RUN>ACC

While turning power supply position from “RUN” to “ACC” (Vehicle
is stopping and selector lever is except P position.)

CRANK>RUN

While turning power supply position from “CRANKING” to “RUN”
(From cranking up the engine to run it)

RUN>URGENT

While turning power supply position from “RUN“ to “ACC” (Emer-
gency stop operation)

ACC>OFF

While turning power supply position from “ACC” to “OFF”

OFF>LOCK

While turning power supply position from “OFF” to “LOCK”

OFF>ACC

While turning power supply position from “OFF” to “ACC”

ON>CRANK

While turning power supply position from “IGN” to “CRANKING”

OFF>SLEEP

While turning BCM status from normal mode (Power supply posi-
tion is “OFF”.) to low power consumption mode

LOCK>SLEEP

While turning BCM status from normal mode (Power supply posi-
tion is “LOCK”.) to low power consumption mode

LOCK

Power supply position is “LOCK” (Ignition switch OFF with steer-
ing is locked.)

OFF

Power supply position is “OFF” (Ignition switch OFF with steering
is unlocked.)

ACC

Power supply position is “ACC” (Ignition switch ACC)

Power supply position is “IGN” (Ignition switch ON with engine
stopped)

ENGINE RUN

Power supply position is “RUN” (Ignition switch ON with engine
running)

CRANKING

Power supply position is “CRANKING” (At engine cranking)

IGN Counter

0 - 39

The number of times that ignition switch is turned ON after DTC is detected
• The number is 0 when a malfunction is detected now.
• The number increases like 1

→

3...38

→

39 after returning to the normal condition

whenever ignition switch OFF

→

ON.

• The number is fixed to 39 until the self-diagnosis results are erased if it is over 39.

Revision: 2008 October

2009 Murano

PCS

DIAGNOSIS SYSTEM (BCM)

PCS-43

< FUNCTION DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

WORK SUPPORT

SELF-DIAG RESULT

Diagnosis mode

Function Description

WORK SUPPORT

Changes the setting for each system function.

SELF-DIAG RESULTS

Displays the diagnosis results judged by BCM.

DATA MONITOR

The BCM input/output signals are displayed.

ACTIVE TEST

The signals used to activate each device are forcibly supplied from BCM.

Monitor item

Description

REMO CONT ID CONFIR

It can be checked whether Intelligent Key ID code is registered or not in this mode.

AUTO LOCK SET

Auto door lock time can be changed in this mode.
• MODE 1: 1 minute
• MODE 2: 5 minutes
• MODE 3: 30 seconds
• MODE 4: 2 minutes

LOCK/UNLOCK BY I-KEY

Door lock/unlock function by door request switch (driver side, passenger side and back door) mode
can be changed to operate (ON) or not operate (OFF) in this mode.

ENGINE START BY I-KEY

Engine start function mode can be changed to operate (ON) or not operate (OFF) with this mode.

TRUNK/GLASS HATCH OPEN

Buzzer reminder function mode by back door request switch can be changed to operate (ON) or
not operate (OFF) with this mode.

PANIC ALARM SET

Panic alarm button pressing time on Intelligent Key remote control button can be selected from the
following with this mode.
• MODE 1: 0.5 sec.
• MODE 2: Non-operation
• MODE 3: 1.5 sec.

PW DOWN SET

Unlock button pressing time on Intelligent Key button can be selected from the following with this
mode.
• MODE 1: 3 sec.
• MODE 2: Non-operation
• MODE 3: 5 sec.

TRUNK OPEN DELAY

NOTE:
This item is displayed, but cannot be supported.

LO- BATT OF KEY FOB WARN

Intelligent Key low battery warning mode can be changed to operate (ON) or not operate (OFF)
with this mode.

ANTI KEY LOCK IN FUNCTI

Key reminder function mode can be changed to operate (ON) or not operate (OFF) with this mode.

HAZARD ANSWER BACK

Hazard reminder function mode can be selected from the following with this mode.
• LOCK ONLY: Door lock operation only
• UNLOCK ONLY: Door unlock operation only
• LOCK/UNLOCK: Lock/unlock operation
• OFF: Non-operation

ANS BACK I-KEY LOCK

Buzzer reminder function (lock operation) mode by door request switch (driver side and passenger
side) can be selected from the following with this mode.
• Horn chirp: Sound horn
• Buzzer: Sound Intelligent Key warning buzzer
• OFF: Non-operation

ANS BACK I-KEY UNLOCK

Buzzer reminder function (unlock operation) mode by door request switch can be changed to op-
erate (ON) or not operate (OFF) with this mode.

SHORT CRANKING OUTPUT

Starter motor can operate during the times below.
• 70 msec
• 100 msec
• 200 msec

INSIDE ANT DIAGNOSIS

This function allows inside key antenna self-diagnosis.

HORN WITH KEYLESS LOCK

Horn reminder function mode by Intelligent Key button can be changed to operate (ON) or not op-
erate (OFF) with this mode.

Revision: 2008 October

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PCS-44

< FUNCTION DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

DIAGNOSIS SYSTEM (BCM)

Refer to

DLK-255, "DTC Index"

DATA MONITOR

Monitor Item

Condition

REQ SW -DR

Indicates [ON/OFF] condition of door request switch (driver side).

REQ SW -AS

Indicates [ON/OFF] condition of door request switch (passenger side).

REQ SW -RR

NOTE:
This item is displayed, but cannot be monitored.

REQ SW -RL

NOTE:
This item is displayed, but cannot be monitored.

REQ SW -BD/TR

Indicates [ON/OFF] condition of back door request switch.

PUSH SW

Indicates [ON/OFF] condition of push-button ignition switch.

IGN RLY2 -F/B

Indicates [ON/OFF] condition of ignition relay 2.

ACC RLY-FB

NOTE:
This item is displayed, but cannot be monitored.

CLUCH SW

NOTE:
This item is displayed, but cannot be monitored.

BRAKE SW 1

Indicates [ON/OFF]* condition of brake switch power supply.

BRAKE SW 2

Indicates [ON/OFF] condition of brake switch.

DETE/CANCL SW

Indicates [ON/OFF] condition of P position.

SFT PN/N SW

Indicates [ON/OFF] condition of P or N position.

S/L -LOCK

Indicates [ON/OFF] condition of steering lock unit (LOCK).

S/L -UNLOCK

Indicates [ON/OFF] condition of steering lock unit (UNLOCK).

S/L RELAY -F/B

Indicates [ON/OFF] condition of ignition switch.

UNLK SEN -DR

Indicates [ON/OFF] condition of driver door UNLOCK status.

PUSH SW -IPDM

Indicates [ON/OFF] condition of push-button ignition switch.

IGN RLY1 -F/B

Indicates [ON/OFF] condition of ignition relay 1.

DETE SW -IPDM

Indicates [ON/OFF] condition of P position.

SFT PN -IPDM

Indicates [ON/OFF] condition of P or N position.

SFT P -MET

Indicates [ON/OFF] condition of P position.

SFT N -MET

Indicates [ON/OFF] condition of N position.

ENGINE STATE

Indicates [STOP/START/CRANK/RUN] condition of engine states.

S/L LOCK-IPDM

Indicates [ON/OFF] condition of steering lock unit (LOCK).

S/L UNLK-IPDM

Indicates [ON/OFF] condition of steering lock unit (UNLOCK).

S/L RELAY-REQ

Indicates [ON/OFF] condition of steering lock relay.

VEH SPEED 1

Display the vehicle speed signal received from combination meter by numerical value [Km/h].

VEH SPEED 2

Display the vehicle speed signal received from ABS or VDC or CVT by numerical value [Km/h].

DOOR STAT-DR

Indicates [LOCK/READY/UNLOCK] condition of driver side door status.

DOOR STAT-AS

Indicates [LOCK/READY/UNLOCK] condition of passenger side door status.

ID OK FLAG

Indicates [SET/RESET] condition of key ID.

PRMT ENG STRT

Indicates [SET/RESET] condition of engine start possibility.

PRMT RKE STRT

NOTE:
This item is displayed, but cannot be monitored.

KEY SW -SLOT

Indicates [ON/OFF] condition of key slot.

TRNK/HAT MNTR

NOTE:
This item is displayed, but cannot be monitored.

RKE-LOCK

Indicates [ON/OFF] condition of LOCK signal from Intelligent Key.

RKE-UNLOCK

Indicates [ON/OFF] condition of UNLOCK signal from Intelligent Key.

Revision: 2008 October

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PCS

DIAGNOSIS SYSTEM (BCM)

PCS-45

< FUNCTION DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

*: OFF is displayed when brake pedal is depressed while brake switch power supply is OFF.

ACTIVE TEST

RKE-TR/BD

NOTE:
This item is displayed, but cannot be monitored.

RKE-PANIC

Indicates [ON/OFF] condition of PANIC button of Intelligent Key.

RKE-P/W OPEN

Indicates [ON/OFF] condition of P/W DOWN signal from Intelligent Key.

RKE-MODE CHG

Indicates [ON/OFF] condition of MODE CHANGE signal from Intelligent Key.

RKE OPE COUN1

When remote keyless entry receiver receives the signal transmitted while operating on Intelligent Key, the
numerical value start changing.

RKE OPE COUN2

NOTE:
This item is displayed, but cannot be monitored.

Monitor Item

Condition

Test item

Description

BATTERY SAVER

This test is able to check interior room lamp operation.
The interior room lamp will be activated after “ON” on CONSULT-III screen is touched.

PW REMOTO DOWN SET

This test is able to check power window down operation.
The power window down will be activated after “ON” on CONSULT-III screen is touched.

INSIDE BUZZER

This test is able to check warning chime in combination meter operation.
• Take away warning chime sounds when “TAKE OUT” on CONSULT-III screen is touched.
• Key warning chime sounds when “KEY WARN” on CONSULT-III screen is touched.
• P position warning chime sounds when “P RNG WARN” on CONSULT-III screen is touched.
• ACC warning chime sounds when “ACC WARN” on CONSULT-III screen is touched.

OUTSIDE BUZZER

This test is able to check Intelligent Key warning buzzer operation.
The Intelligent Key warning buzzer will be activated after “ON” on CONSULT-III screen is touched.

INDICATOR

This test is able to check warning lamp operation.
• “KEY” Warning lamp illuminates when “KEY ON” on CONSULT-III screen is touched.
• “KEY” Warning lamp flashes when “KEY IND” on CONSULT-III screen is touched.

INT LAMP

This test is able to check interior room lamp operation.
The interior room lamp will be activated after “ON” on CONSULT-III screen is touched.

LCD

This test is able to check meter display information
• Engine start information displays when “BP N” on CONSULT-III screen is touched.
• Engine start information displays when “BP I” on CONSULT-III screen is touched.
• Key ID warning displays when “ID NG” on CONSULT-III screen is touched.
• Steering lock information displays when “ROTAT” on CONSULT-III screen is touched.
• P position warning displays when “SFT P” on CONSULT-III screen is touched.
• Intelligent Key insert information displays when “INSRT” on CONSULT-III screen is touched.
• Intelligent Key low battery warning displays when “BATT” on CONSULT-III screen is touched.
• Take away through window warning displays when “NO KY” on CONSULT-III screen is touched.
• Take away warning display when “OUTKEY” on CONSULT-III screen is touched.
• OFF position warning display when “LK WN” on CONSULT-III screen is touched.

TRUNK/GLASS HATCH

This test is able to check back door opener actuator open operation.
This actuator opens when “ON” on CONSULT-III screen is touched.

FLASHER

This test is able to check hazard warning lamp operation.
The hazard warning lamps will be activated after “ON” on CONSULT-III screen is touched.

HORN

This test is able to check horn operation.
The horn will be activated after “ON” on CONSULT-III screen is touched.

IGN CONT2

This test is able to check ignition relay operation.
The ignition relay will be activated after “ON” on CONSULT-III screen is touched.

P RANGE

This test is able to check control device power supply
Control device power is supplied when “ON” on CONSULT-III screen is touched.

ENGINE SW ILLUMI

This test is able to check push-ignition switch illumination operation.
Push-ignition switch illumination illuminates when “ON” on CONSULT-III screen is touched.

LOCK INDICATOR

NOTE:
This item is displayed, but cannot be tested.

Revision: 2008 October

2009 Murano

PCS

U1000 CAN COMM CIRCUIT

PCS-47

< COMPONENT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

COMPONENT DIAGNOSIS

U1000 CAN COMM CIRCUIT

BCM

BCM : Description

INFOID:0000000003668888

CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Modern
vehicle is equipped with many electronic control unit, and each control unit shares information and links with
other control units during operation (not independent). In CAN communication, control units are connected
with 2 communication lines (CAN H-line, CAN L-line) allowing a high rate of information transmission with less
wiring. Each control unit transmits/receives data but selectively reads required data only.
CAN Communication Signal Chart. Refer to

LAN-25, "CAN Communication Signal Chart"

BCM : DTC Logic

INFOID:0000000003668889

DTC DETECTION LOGIC

BCM : Diagnosis Procedure

INFOID:0000000003668890

PERFORM SELF DIAGNOSTIC

Turn ignition switch ON and wait for 2 seconds or more.

Check “Self Diagnostic Result”.

Is “U1000: CAN COMM CIRCUIT” displayed?

YES

>> Refer to

LAN-16, "Trouble Diagnosis Flow Chart"

>> Refer to

GI-40, "Intermittent Incident"

DTC

CONSULT-III display

description

DTC Detection Condition

Possible cause

U1000

CAN COMM CIRCUIT

When BCM cannot communicate CAN com-
munication signal continuously for 2 seconds
or more.

CAN communication system

Revision: 2008 October

2009 Murano

PCS-48

< COMPONENT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

U1010 CONTROL UNIT (CAN)

U1010 CONTROL UNIT (CAN)

BCM

BCM : DTC Logic

INFOID:0000000003668894

DTC DETECTION LOGIC

BCM : Diagnosis Procedure

INFOID:0000000003668895

REPLACE BCM

When DTC “U1010: CONTROL UNIT (CAN)” is detected, replace BCM.

>> Replace BCM. Refer to

BCS-96, "Exploded View"

DTC

CONSULT-III display de-

scription

DTC Detection Condition

Possible cause

U1010

CONTROL UNIT (CAN)

BCM detected internal CAN communication circuit malfunction.

BCM

Revision: 2008 October

2009 Murano

PCS

B2553 IGNITION RELAY

PCS-49

< COMPONENT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

B2553 IGNITION RELAY

Description

INFOID:0000000003375868

BCM turns ON the following relays to ignition power supply to each ECU when the ignition switch is turned
ON.
• Ignition relay (inside fuse box)
• Ignition relay (inside IPDM E/R)
• Blower relay
BCM checks any ignition relay ON request for consistency with the actual ignition relay operation status.

DTC Logic

INFOID:0000000003375869

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

Turn ignition switch ON under the following conditions (start the engine), and wait for at least 2 seconds.

Selector lever is in the P or N position.

Do not depress brake pedal.

Check “Self diagnostic result” with CONSULT-III.

Is DTC detected?

YES

>> Go to

PCS-49, "Diagnosis Procedure"

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000003375870

CHECK DTC WITH IPDM E/R

Check “Self diagnostic result” with CONSULT-III. Refer to

PCS-32, "DTC Index"

Is the inspection result normal?

YES

>> GO TO 2.

>> Repair or replace malfunctioning parts.

CHECK FUSE

Check that the following fuse are not fusing.

Is the fuse fusing?

YES

>> Repair the applicable circuit. And then replace the fuse.

>> GO TO 3.

CHECK IGNITION RELAY FEEDBACK INPUT SIGNAL

Turn ignition switch OFF.

Disconnect BCM connector.

Check voltage between BCM harness connector and ground.

DTC No.

Trouble diagnosis

name

DTC detecting condition

Possible cause

B2553

IGNITION RELAY

BCM detects a difference of signal for 2 seconds or
more between the following information.
• Ignition relay (fuse block) ON/OFF operation
• Ignition relay (fuse block) feedback.

• Harness or connectors

(ignition relay feedback circuit is
open or short)

• BCM
• IPDM E/R

Signal name

Connection position

Fuse No.

Capacity

Ignition power supply

FUSE BLOCK (J/B)

10A

Revision: 2008 October

2009 Murano

PCS-50

< COMPONENT DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

B2553 IGNITION RELAY

Is the inspection result normal?

YES

>> Replace BCM. Refer to

BCS-96, "Removal and Installation"

>> GO TO 4.

CHECK IGNITION RELAY FEEDBACK CIRCUIT

Disconnect fuse block (J/B) connector.

Check continuity between BCM harness connector and fuse block (J/B) harness connector.

Check continuity between BCM harness connector and ground.

Is the inspection result normal?

YES

>> Replace IPDM E/R. Refer to

PCS-34, "Removal and Installation"

>> Repair or replace harness.

(+)

(–)

Condition

Voltage (V)

(Approx.)

BCM

Connector

Terminal

M123

123

Ground

Ignition switch

OFF

Battery voltage

BCM

FUSE BLOCK (J/B)

Continuity

Connector

Terminal

Connector

Terminal

M123

123

Existed

BCM

Ground

Continuity

Connector

Terminal

M123

123

Not existed

Revision: 2008 October

2009 Murano

Nissan Murano Z51 (2008 year). Manual - part 279