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K ELECTRICAL
A
B
SECTION
POWER SUPPLY, GROUND & CIRCUIT ELEMENTS C
D
E
CONTENTS
POWER SUPPLY ROUTING CIRCUIT ..................... 3 . Harness Layout ..................................................... 37 . F
Schematic ............................................................... 3
. HOW TO READ HARNESS LAYOUT ................ 37 .
Wiring Diagram -- POWER -- ................................ 5 . OUTLINE ............................................................ 38.
BATTERY POWER SUPPLY -- IGNITION SW. MAIN HARNESS ................................................ 39 . G
IN ANY POSITION ............................................... 5 . ENGINE ROOM HARNESS (LH VIEW) ............. 41 .
ACCESSORY POWER SUPPLY -- IGNITION ENGINE ROOM HARNESS (RH VIEW) ............ 44 .
SW. IN ACC OR ON ............................................. 9 . ENGINE CONTROL HARNESS (QR25DE) ....... 46 .
H
IGNITION POWER SUPPLY -- IGNITION SW. ENGINE CONTROL HARNESS (VQ35DE) ....... 48 .
IN ON ................................................................. 10
. BODY HARNESS ............................................... 50 .
IGNITION POWER SUPPLY -- IGNITION SW. BODY NO. 2 HARNESS .................................... 52 .
IN ON AND/OR START .......................................11 . ROOM LAMP HARNESS ................................... 54 . I
IPDM E/R (INTELLIGENT POWER DISTRIBUTION FRONT DOOR LH HARNESS ........................... 55 .
MODULE ENGINE ROOM) ..................................... 14 . FRONT DOOR RH HARNESS ........................... 55 .
System Description ............................................... 14 . REAR DOOR LH HARNESS .............................. 56 . J
SYSTEMS CONTROLLED BY IPDM E/R .......... 14 . REAR DOOR RH HARNESS ............................. 56 .
CAN COMMUNICATION LINE CONTROL ........ 14 . Wiring Diagram Codes (Cell Codes) ..................... 57 .
IPDM E/R STATUS CONTROL .......................... 14 . ELECTRICAL UNITS LOCATION ........................... 60 . PG
CAN Communication System Description ............. 15 . Electrical Units Location ........................................ 60 .
FOR TCS MODELS ........................................... 15 . ENGINE COMPARTMENT ................................. 60 .
FOR A/T MODELS ............................................. 16 . PASSENGER COMPARTMENT ........................ 61 .
FOR M/T MODELS ............................................ 18 . Fuse ....................................................................... 63
. L
Function of Detecting Ignition Relay Malfunction ... 19 Fusible Link ........................................................... 63
.
Auto Active Test .................................................... 19
. Circuit Breaker (Built Into BCM) ............................ 63 .
DESCRIPTION ................................................... 19 . HARNESS CONNECTOR ........................................ 64 . M
OPERATION PROCEDURE .............................. 19 . Description ............................................................. 64
.
INSPECTION IN AUTO ACTIVE TEST MODE ... 20 HARNESS CONNECTOR (TAB-LOCKING
Schematic ............................................................. 22
. TYPE) ................................................................. 64
.
IPDM E/R FUSE AND RELAY ARRANGEMENT 23 ... HARNESS CONNECTOR (SLIDE-LOCKING
IPDM E/R TERMINAL ARRANGEMENT ........... 23 . TYPE) ................................................................. 65
.
IPDM E/R Power/Ground Circuit Inspection ......... 23 . HARNESS CONNECTOR (DIRECT-CONNECT
Removal and Installation of IPDM E/R .................. 24 . SRS COMPONENT TYPE) ................................ 66 .
GROUND CIRCUIT .................................................. 26 . JOINT CONNECTOR (J/C) ...................................... 67 .
Ground Distribution ............................................... 26. Terminal Arrangement ........................................... 67 .
MAIN HARNESS ................................................ 26 . ELECTRICAL UNITS ............................................... 68 .
ENGINE ROOM HARNESS ............................... 28 . Terminal Arrangement ........................................... 68 .
ENGINE CONTROL HARNESS (QR25DE) ....... 30 . STANDARDIZED RELAY ......................................... 69 .
ENGINE CONTROL HARNESS (VQ35DE) ....... 32 . Description ............................................................. 69
.
BODY HARNESS ............................................... 34 . NORMAL OPEN, NORMAL CLOSED AND
BODY NO. 2 HARNESS .................................... 35 . MIXED TYPE RELAYS ....................................... 69 .
HARNESS ................................................................ 37
. TYPE OF STANDARDIZED RELAYS ................ 69 .
Revision: May 2004 PG-1 2003 Altima
FUSE BLOCK-JUNCTION BOX(J/B) ...................... 71 . FUSE AND FUSIBLE LINK BOX .............................72 .
Terminal Arrangement ........................................... 71
. Terminal Arrangement ............................................72
.
Revision: May 2004 PG-2 2003 Altima
POWER SUPPLY ROUTING CIRCUIT
POWER SUPPLY ROUTING CIRCUIT PFP:24110
A
Schematic EKS003J6
For detailed ground distribution, refer to PG-26, "Ground Distribution" .
B
C
D
E
F
G
H
I
J
PG
L
M
WKWA0093E
Revision: May 2004 PG-3 2003 Altima
POWER SUPPLY ROUTING CIRCUIT
WKWA0094E
Revision: May 2004 PG-4 2003 Altima
POWER SUPPLY ROUTING CIRCUIT
Wiring Diagram -- POWER -- EKS003J7
BATTERY POWER SUPPLY -- IGNITION SW. IN ANY POSITION A
B
C
D
E
F
G
H
I
J
PG
L
M
WKWA0262E
Revision: May 2004 PG-5 2003 Altima
POWER SUPPLY ROUTING CIRCUIT
WKWA0263E
Revision: May 2004 PG-6 2003 Altima
POWER SUPPLY ROUTING CIRCUIT
A
B
C
D
E
F
G
H
I
J
PG
L
M
WKWA0264E
Revision: May 2004 PG-7 2003 Altima
POWER SUPPLY ROUTING CIRCUIT
WKWA0265E
Revision: May 2004 PG-8 2003 Altima
POWER SUPPLY ROUTING CIRCUIT
ACCESSORY POWER SUPPLY -- IGNITION SW. IN ACC OR ON
A
B
C
D
E
F
G
H
I
J
PG
L
M
WKWA0266E
Revision: May 2004 PG-9 2003 Altima
POWER SUPPLY ROUTING CIRCUIT
IGNITION POWER SUPPLY -- IGNITION SW. IN ON
WKWA0089E
Revision: May 2004 PG-10 2003 Altima
POWER SUPPLY ROUTING CIRCUIT
IGNITION POWER SUPPLY -- IGNITION SW. IN ON AND/OR START
A
B
C
D
E
F
G
H
I
J
PG
L
M
WKWA0267E
Revision: May 2004 PG-11 2003 Altima
POWER SUPPLY ROUTING CIRCUIT
WKWA0268E
Revision: May 2004 PG-12 2003 Altima
POWER SUPPLY ROUTING CIRCUIT
A
B
C
D
E
F
G
H
I
J
PG
L
M
WKWA0269E
Revision: May 2004 PG-13 2003 Altima
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
PFP:284B7
System Description EKS003J8
q IPDM E/R (Intelligent Power Distribution Module Engine Room) integrates the relay box and fuse block
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 reception, etc.
q It controls operation of each electrical part via BCM and CAN communication lines.
CAUTION:
All IPDM E/R-integrated relays cannot be removed.
SYSTEMS CONTROLLED BY IPDM E/R
1. Lamp control
Using CAN communication line, it receives signal from BCM and controls the following lamps:
q Headlamps (Hi, Lo)
q Parking lamps
q Tail lamps
q Front fog lamps
2. Wiper control
Using CAN communication line, it receives signals from BCM and controls the front wipers.
3. Rear window defogger relay control
Using CAN communication line, it receives signals from BCM and controls the rear window defogger relay.
4. A/C compressor control
Using CAN communication line, it receives signal from ECM and controls the A/C relay.
5. Cooling fan control
Using CAN communication line, it receives signal from ECM and controls cooling fan relay.
CAN COMMUNICATION LINE CONTROL
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 read necessary information only.
1. 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.
q Operation of control parts by IPDM E/R during fail-safe mode is as follows:
Controlled parts Fail-safe mode
Headlamps Headlamp relay (Lo) ON
Front fog lamps Front fog lamp relay OFF
Tail and parking lamps Tail lamp relay OFF
Until ignition switch is turned OFF, status immediately before fail-safe control is performed
Front wipers
is maintained.
Rear window defogger Rear window defogger relay OFF
Cooling fan Cooling fan (HI) ON
A/C compressor A/C relay OFF
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.
Revision: May 2004 PG-14 2003 Altima
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
q When sleep request signal is received from BCM, mode is switched to sleep waiting status.
2. Sleep waiting status A
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. B
3. Sleep status
q IPDM E/R operates in low current-consumption mode.
C
q CAN communication is stopped.
q When a change in CAN communication line is detected, mode switches to CAN communication status.
CAN Communication System Description EKS003J9 D
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. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other E
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. F
FOR TCS MODELS
System diagram
G
H
I
LKIA0015E J
Input/output signal chart
T: Transmit R: Receive
COMBINA- PG
ABS/TCS
Signals ECM TCM TION BCM IPDM E/R
control unit
METER
Engine speed signal T R R L
Engine coolant temperature signal T R
Accelerator pedal position signal T
M
Fuel consumption monitor signal T R
A/T warning lamp signal T R
A/T position indicator signal R T R R(R range only) R
ABS operation signal R T
TCS operation signal R R T
Air conditioner switch signal R T
Air conditioner compressor signal R T
A/C compressor request signal T R
Cooling fan motor operation signal R T
Cooling fan speed request signal T R
Position lights request R T R
Position lights status R T
Low beam request T R
Revision: May 2004 PG-15 2003 Altima
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
COMBINA-
ABS/TCS
Signals ECM TCM TION BCM IPDM E/R
control unit
METER
Low beam status R R T
High beam request R T R
High beam status R R T
Front fog lights request T R
Front fog light status R T
OD cancel switch signal R T R
Brake switch signal R T
R T
Vehicle speed signal
R T R
Oil pressure switch R T
Sleep request1 R T
Sleep request2 T R
N range switch signal R T
P range switch signal R T
Seat belt buckle switch signal T R
Door switch signal R T R
Tail lamp request R T R
Turn indicator signal R T
Buzzer output signal R T
Trunk switch signal R T
ASCD main switch signal T R
ASCD cruise signal T R
Wiper operation R T
Wiper stop position signal R T
Rear window defogger switch signal T R
Rear window defogger control sig-
R R T
nal
FOR A/T MODELS
System diagram
LKIA0017E
Input/output signal chart
T: Transmit R: Receive
COMBINATION
Signals ECM TCM BCM IPDM E/R
METER
Engine speed signal T R
Engine coolant temperature signal T R
Revision: May 2004 PG-16 2003 Altima
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
COMBINATION
Signals ECM TCM BCM IPDM E/R
METER A
Accelerator pedal position signal T R
Fuel consumption monitor signal T R
B
A/T warning lamp signal T R
A/T position indicator signal R T R R(R range only)
Air conditioner switch signal R T C
Air conditioner compressor signal R T
A/C compressor request signal T R
D
Blower fan switch signal R(QR25DE) T
Cooling fan motor operation signal R T
Cooling fan speed request signal T R E
Position lights request R T R
Position lights status R T
F
Low beam request T R
Low beam status R R T
High beam request R T R G
High beam status R R T
Front fog lights request T R
H
Front fog light status R T
OD cancel switch signal R T R
Brake switch signal R T I
R T
Vehicle speed signal
R T R
Oil pressure switch R T
J
Sleep request1 R T
Sleep request2 T R
PG
N range switch signal R T
P range switch signal R T
Seat belt buckle switch signal T R L
Door switch signal R T R
Tail lamp request R T R
M
Turn indicator signal R T
Buzzer output signal R T
Trunk switch signal R T
ASCD main switch signal T R
ASCD cruise signal T R
Wiper operation R T
Wiper stop position signal R T
Rear window defogger switch signal T R
Rear window defogger control signal R R T
Revision: May 2004 PG-17 2003 Altima
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
FOR M/T MODELS
System diagram
LKIA0018E
Input/output signal chart
T: Transmit R: Receive
COMBINATION
Signals ECM BCM IPDM E/R
METER
Engine speed signal T
Engine coolant temperature signal T
Fuel consumption monitor signal T
Air conditioner switch signal R T
Air conditioner compressor signal R T
A/C compressor request signal T R
Blower fan switch signal R(QR25DE) T
Cooling fan motor operation signal R T
Cooling fan speed request signal T R
Position lights request R T R
Position lights status R T
Low beam request T R
Low beam status R R T
High beam request R T R
High beam status R R T
Front fog lights request T R
Front fog light status R T
Vehicle speed signal R T
Oil pressure switch R T
Sleep request1 R T
Sleep request2 T R
Seat belt buckle switch signal T R
Door switch signal R T R
Tail lamp request R T R
Turn indicator signal R T
Buzzer output signal R T
Trunk switch signal R T
ASCD main switch signal T R
ASCD cruise signal T R
Wiper operation R T
Wiper stop position signal R T
Revision: May 2004 PG-18 2003 Altima
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
COMBINATION
Signals ECM BCM IPDM E/R
METER A
Rear window defogger switch signal T R
Rear window defogger control signal R R T
B
Function of Detecting Ignition Relay Malfunction EKS003JA
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 IPDM E/R malfunction. C
Auto Active Test EKS003JB
DESCRIPTION
D
q In auto active test mode, operation inspection can be performed when IPDM E/R sends a drive signal to
the following systems:
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