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POWER SUPPLY, GROUND & CIRCUIT ELEMENTS

K ELECTRICAL

B
SECTION
POWER SUPPLY, GROUND & CIRCUIT ELEMENTS C

E
CONTENTS
POWER SUPPLY ROUTING CIRCUIT ..................... 3 . GROUND .................................................................. 29
. F
Schematic ............................................................... 3
. Ground Distribution ................................................ 29
.
Wiring Diagram -- POWER -- ................................ 4 . MAIN HARNESS ................................................ 29 .
BATTERY POWER SUPPLY -- IGNITION SW. ENGINE ROOM HARNESS ............................... 32 . G
IN ANY POSITION ............................................... 4 . ENGINE CONTROL HARNESS ......................... 34 .
ACCESSORY POWER SUPPLY -- IGNITION BODY HARNESS ............................................... 35 .
SW. IN "ACC" OR "ON" ........................................ 9 . BODY NO. 2 HARNESS .................................... 37 .
H
IGNITION POWER SUPPLY -- IGNITION SW. HARNESS ................................................................ 38
.
IN "ON" AND/OR "START" ................................. 10 . Harness Layout ..................................................... 38
.
Fuse ...................................................................... 16
. HOW TO READ HARNESS LAYOUT ................ 38 .
Fusible Link ........................................................... 16
. OUTLINE ............................................................ 39
. I
Circuit Breaker ...................................................... 16
. MAIN HARNESS ................................................ 40 .
IPDM E/R (INTELLIGENT POWER DISTRIBUTION ENGINE ROOM HARNESS ............................... 43 .
MODULE ENGINE ROOM) ..................................... 17 . ENGINE CONTROL HARNESS ......................... 46 . J
System Description ............................................... 17 . BODY HARNESS ............................................... 48 .
SYSTEMS CONTROLLED BY IPDM E/R .......... 17 . BODY NO. 2 HARNESS .................................... 50 .
CAN COMMUNICATION LINE CONTROL ........ 17 . ROOM LAMP HARNESS ................................... 51 .
PG
IPDM E/R STATUS CONTROL .......................... 18 . FRONT DOOR HARNESS ................................. 52 .
CAN Communication System Description ............. 18 . REAR DOOR HARNESS ................................... 53 .
CAN Communication Unit ..................................... 18 . BACK DOOR HARNESS ................................... 54 .
Function of Detecting Ignition Relay Malfunction ... 18 Wiring Diagram Codes (Cell Codes) ..................... 55 . L
CONSULT-II Function (IPDM E/R) ........................ 19 . ELECTRICAL UNITS LOCATION ........................... 58 .
CONSULT-II INSPECTION PROCEDURE ........ 19 . Electrical Units Location ........................................ 58 .
SELF-DIAG RESULTS ....................................... 19 . ENGINE COMPARTMENT ................................. 58 . M
DATA MONITOR ................................................ 19 . PASSENGER COMPARTMENT ........................ 59 .
ACTIVE TEST .................................................... 21 . LUGGAGE COMPARTMENT ............................. 61 .
Auto Active Test .................................................... 21. HARNESS CONNECTOR ........................................ 62 .
DESCRIPTION ................................................... 21 . Description ............................................................. 62
.
OPERATION PROCEDURE .............................. 21 . HARNESS CONNECTOR (TAB-LOCKING
INSPECTION IN AUTO ACTIVE TEST MODE ... 22 TYPE) ................................................................. 62
.
Schematic ............................................................. 24
. HARNESS CONNECTOR (SLIDE-LOCKING
IPDM E/R Terminal Arrangement .......................... 25 . TYPE) ................................................................. 63
.
IPDM E/R Power/Ground Circuit Inspection ......... 26 . HARNESS CONNECTOR (LEVER LOCKING
Inspection with CONSULT-II (Self-Diagnosis) ....... 27 . TYPE) ................................................................. 64
.
Removal and Installation of IPDM E/R .................. 28 . ELECTRICAL UNITS ............................................... 65 .
REMOVAL .......................................................... 28 . Terminal Arrangement ........................................... 65 .
INSTALLATION .................................................. 28 . SMJ (SUPER MULTIPLE JUNCTION) .................... 67 .
Terminal Arrangement ........................................... 67 .

Revision: 2006 July PG-1 2007 Murano
STANDARDIZED RELAY ......................................... 68 . FUSE BLOCK - JUNCTION BOX (J/B) ...................70 .
Description ............................................................. 68
. Terminal Arrangement ............................................70
.
NORMAL OPEN, NORMAL CLOSED AND FUSE, FUSIBLE LINK AND RELAY BOX ...............71 .
MIXED TYPE RELAYS ....................................... 68 . Terminal Arrangement ............................................71
.
TYPE OF STANDARDIZED RELAYS ................. 68 .

Revision: 2006 July PG-2 2007 Murano
POWER SUPPLY ROUTING CIRCUIT

POWER SUPPLY ROUTING CIRCUIT PFP:24110
A
Schematic NKS0025A

TKWB2680E

Revision: 2006 July PG-3 2007 Murano
POWER SUPPLY ROUTING CIRCUIT

Wiring Diagram -- POWER -- NKS0025B

BATTERY POWER SUPPLY -- IGNITION SW. IN ANY POSITION

TKWB2681E

Revision: 2006 July PG-4 2007 Murano
POWER SUPPLY ROUTING CIRCUIT

TKWB2682E

Revision: 2006 July PG-5 2007 Murano
POWER SUPPLY ROUTING CIRCUIT

TKWB2683E

Revision: 2006 July PG-6 2007 Murano
POWER SUPPLY ROUTING CIRCUIT

TKWB2684E

Revision: 2006 July PG-7 2007 Murano
POWER SUPPLY ROUTING CIRCUIT

TKWB2685E

Revision: 2006 July PG-8 2007 Murano
POWER SUPPLY ROUTING CIRCUIT

ACCESSORY POWER SUPPLY -- IGNITION SW. IN "ACC" OR "ON"
A

TKWB2686E

Revision: 2006 July PG-9 2007 Murano
POWER SUPPLY ROUTING CIRCUIT

IGNITION POWER SUPPLY -- IGNITION SW. IN "ON" AND/OR "START"

TKWB2687E

Revision: 2006 July PG-10 2007 Murano
POWER SUPPLY ROUTING CIRCUIT

TKWB2688E

Revision: 2006 July PG-11 2007 Murano
POWER SUPPLY ROUTING CIRCUIT

TKWB0538E

Revision: 2006 July PG-12 2007 Murano
POWER SUPPLY ROUTING CIRCUIT

TKWB0539E

Revision: 2006 July PG-13 2007 Murano
POWER SUPPLY ROUTING CIRCUIT

TKWB2689E

Revision: 2006 July PG-14 2007 Murano
POWER SUPPLY ROUTING CIRCUIT

TKWA1753E

Revision: 2006 July PG-15 2007 Murano
POWER SUPPLY ROUTING CIRCUIT

Fuse NKS0025C

q If fuse is blown, be sure to eliminate cause of malfunction before
installing new fuse.
q Use fuse of specified rating. Never use fuse of more than speci-
fied rating.
q Do not partially install fuse; always insert it into fuse holder prop-
erly.
q Remove fuse for "ELECTRICAL PARTS (BAT)" if vehicle is not
used for a long period of time.

CEL083

Fusible Link NKS0025D

A melted fusible link can be detected either by visual inspection or by
feeling with finger tip. If its condition is questionable, use circuit
tester or test lamp.
CAUTION:
q If fusible link should melt, it is possible that critical circuit
(power supply or large current carrying circuit) is shorted.
In such a case, carefully check and eliminate cause of mal-
function.
q Never wrap outside of fusible link with vinyl tape. Important:
Never let fusible link touch any other wiring harness, vinyl
or rubber parts. CKIB0293E

Circuit Breaker NKS0025E

The PTC thermistor generates heat in response to current flow. The
temperature (and resistance) of the thermistor element varies with
current flow. Excessive current flow will cause the element's temper-
ature to rise. When the temperature reaches a specified level, the
electrical resistance will rise sharply to control the circuit current.
Reduced current flow will cause the element to cool. Resistance falls
accordingly and normal circuit current flow is allowed to resume.

SEL109W

Revision: 2006 July PG-16 2007 Murano
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)

IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
PFP:284B7 A
System Description NKS0025F

q IPDM E/R (Intelligent Power Distribution Module Engine Room) integrates the relay box and fuse block B
which were originally placed in engine compartment. It controls integrated relay via IPDM E/R control cir-
cuit.
q IPDM E/R-integrated control circuit performs ON-OFF operation of relay, CAN communication control, oil
pressure switch signal, and hood switch signal reception, etc. C
q It controls operation of each electrical part via ECM, BCM and CAN communication lines.
CAUTION:
None of the IPDM E/R-integrated relays can be removed. D

SYSTEMS CONTROLLED BY IPDM E/R
IPDM E/R receives a request signal from each control unit with CAN communication. It controls each system. E
Control system Transmit control unit Control part
q Headlamps (HI, LO)
Lamp control BCM q Front fog lamps F
q Parking, license plate, side marker and tail lamps
Wiper control BCM Front wipers
G
Rear window defogger control BCM Rear window defogger
A/C compressor control ECM A/C compressor (magnet clutch)
Cooling fan control ECM Cooling fan H
Horn control BCM Horn

CAN COMMUNICATION LINE CONTROL I
With CAN communication, by connecting each control unit using two communication lines (CAN L line, CAN H
line), it is possible to transmit maximum amount of information with minimum wiring. Each control unit can
transmit and receive data, and reads necessary information only.
J
Fail-Safe Control
q When CAN communication with other control units is impossible, IPDM E/R performs fail-safe control.
After CAN communication recovers normally, it also returns to normal control. PG
q Operation of control parts by IPDM E/R during fail-safe mode is as follows:
Controlled system Fail-safe mode
L
q With the ignition switch ON, the headlamp (LO) is ON.
Headlamp
q With the ignition switch OFF, the headlamp (LO) is OFF.
q With the ignition switch ON, the parking, license plate, side marker and tail lamps are ON. M
Parking, license plate, side marker and
tail lamps q With the ignition switch OFF, the parking, license plate, side marker and tail lamps are
OFF.
q With the ignition switch ON, the cooling fan HI operates.
Cooling fan
q With the ignition switch OFF, the cooling fan stops.
Until the ignition switch is turned OFF, the front wiper LO and HI remains in the same status
Front wiper
it was in just before fail-safe control was initiated.
Rear window defogger Rear window defogger relay OFF
A/C compressor A/C compressor OFF
Front fog lamps Front fog lamp relay OFF

Revision: 2006 July PG-17 2007 Murano
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)

IPDM E/R STATUS CONTROL
In order to save power, IPDM E/R switches status by itself based on each operating condition.
1. CAN communication status
q CAN communication is normally performed with other control units.

q Individual unit control by IPDM E/R is normally performed.

q When sleep request signal is received from BCM, mode is switched to sleep waiting status.

2. Sleep waiting status
q Process to stop CAN communication is activated.

q All systems controlled by IPDM E/R are stopped. When 3 seconds have elapsed after CAN communi-
cation with other control units is stopped, mode switches to sleep status.
3. Sleep status
q IPDM E/R operates in low power mode.

q CAN communication is stopped.

q When a change in CAN communication line is detected, mode switches to CAN communication status.

q When a change hood switch or ignition switch signal is detected, mode switches to CAN communica-
tion status.
CAN Communication System Description NKS0025G

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Modern
vehicles are equipped with many electronic control units and each control unit shares information and links
with other control units during operation (not independent). In CAN communication, control units are con-
nected 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 Unit NKS0025H

Refer to LAN-49, "CAN System Specification Chart" .
Function of Detecting Ignition Relay Malfunction NKS0025I

q When contact point of integrated ignition relay is stuck and cannot be turned OFF, IPDM E/R turns ON tail
and parking lamps for 10 minutes to indicate ignition relay malfunction.
q When a state of ignition relay having built-in does not agree with a state of Ignition switch signal input by a
CAN communication from BCM, IPDM E/R lets tail lamp relay operate.
Ignition switch signal Ignition relay status Tail lamp relay
ON ON --
OFF OFF --
ON OFF --
OFF ON ON (10 minutes)
NOTE:
When the ignition switch is turned ON, the tail lamps are OFF.

Revision: 2006 July PG-18 2007 Murano
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)

CONSULT-II Function (IPDM E/R) NKS0025J

A
CONSULT-II can display each diagnostic item using the diagnostic test mode shown following.
Inspection Item, Diagnosis Mode Description
SELF-DIAG RESULTS The IPDM E/R performs diagnosis of the CAN communication and self-diagnosis. B
DATA MONITOR The input/output data of the IPDM E/R is displayed in real time.
CAN DIAG SUPPORT MNTR The result of transmit/receive diagnosis of CAN communication can be read.
C
ACTIVE TEST The IPDM E/R sends a drive signal to electronic components to check their operation.

CONSULT-II INSPECTION PROCEDURE
D
Refer to GI-37, "CONSULT-II Start Procedure" .
SELF-DIAG RESULTS
Operation Procedure E
1. Touch "SELF-DIAG RESULTS" on "SELECT DIAG MODE" screen.
2. Check display content in self-diagnostic results.
Display Item List F

CONSULT-II TIME
Display Items Malfunction detecting condition Possible causes
display code CRNT PAST G
NO DTC IS
DETECTED.FURTHER
- - - - -
TESTING MAY BE
H
REQUIRED.
q If CAN communication reception/transmis- Any of or several items
sion data has a malfunction, or if any of the below have errors.
control units malfunction, data reception/ I
CAN COMM CIRCUIT U1000 transmission cannot be confirmed.

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