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K ELECTRICAL

POWER SUPPLY, GROUND & CIRCUIT ELEMENTS
SECTION PG B

E
CONTENTS
PRECAUTIONS ......................................................... 3 . Terminals and Reference Values for IPDM E/R ..... 28 . F
Precautions for Supplemental Restraint System IPDM E/R Power/Ground Circuit Inspection .......... 30 .
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- Inspection with CONSULT-II (Self-Diagnosis) ....... 31 .
SIONER" ................................................................. 3
. Removal and Installation of IPDM E/R .................. 32 . G
POWER SUPPLY ROUTING CIRCUIT ..................... 4 . REMOVAL .......................................................... 32.
Schematic ............................................................... 4
. INSTALLATION .................................................. 32 .
Wiring Diagram -- POWER -- ................................ 6 . GROUND CIRCUIT .................................................. 33 .
H
BATTERY POWER SUPPLY -- IGNITION SW. Ground Distribution ................................................ 33.
IN ANY POSITION ............................................... 6 . MAIN HARNESS ................................................ 33 .
ACCESSORY POWER SUPPLY -- IGNITION ENGINE ROOM HARNESS ............................... 36 .
SW. IN ACC OR ON ........................................... 12 . ENGINE CONTROL HARNESS (VQ40DE MOD- I
IGNITION POWER SUPPLY -- IGNITION SW. ELS) ................................................................... 40
.
IN ON ................................................................. 13
. ENGINE CONTROL HARNESS (QR25DE MOD-
IGNITION POWER SUPPLY -- IGNITION SW. ELS) ................................................................... 41
. J
IN ON AND/OR START ...................................... 14 . BODY HARNESS ............................................... 42 .
IGNITION POWER SUPPLY -- IGNITION BODY NO. 2 HARNESS .................................... 43 .
SWITCH IN START ............................................ 16 . HARNESS ................................................................ 44
.
PG
Fuse ...................................................................... 17
. Harness Layout ..................................................... 44.
Fusible Link ........................................................... 17
. HOW TO READ HARNESS LAYOUT ................ 44 .
Circuit Breaker (Built Into BCM) ............................ 17 . OUTLINE (KING CAB MODELS) ....................... 45 .
IPDM E/R (INTELLIGENT POWER DISTRIBUTION OUTLINE (CREW CAB MODELS) ..................... 46 . L
MODULE ENGINE ROOM) ..................................... 18 . MAIN HARNESS ................................................ 47 .
System Description ............................................... 18 . ENGINE ROOM HARNESS (RH VIEW) ............ 49 .
SYSTEMS CONTROLLED BY IPDM E/R .......... 18 . ENGINE ROOM HARNESS (LH VIEW) ............. 53 . M
CAN COMMUNICATION LINE CONTROL ........ 18 . ENGINE CONTROL HARNESS (QR25DE MOD-
IPDM E/R STATUS CONTROL .......................... 19 . ELS) ................................................................... 55
.
CAN Communication System Description ............. 19 . ENGINE CONTROL HARNESS (VQ40DE MOD-
Function of Detecting Ignition Relay Malfunction ... 19 ELS) ................................................................... 57
.
CONSULT-II Function (IPDM E/R) ........................ 20 . CHASSIS HARNESS ......................................... 59 .
CONSULT-II START PROCEDURE ................... 20 . BODY HARNESS (KING CAB MODELS) .......... 61 .
SELF-DIAGNOSTIC RESULTS ......................... 20 . BODY HARNESS (CREW CAB MODELS) ........ 63 .
DATA MONITOR ................................................ 21 . BODY NO. 2 HARNESS (KING CAB MODELS) 65 ...
CAN DIAG SUPPORT MNTR ............................ 21 . BODY NO. 2 HARNESS (CREW CAB MODELS) 67 ...
ACTIVE TEST .................................................... 21 . ROOM LAMP HARNESS ................................... 69 .
Auto Active Test .................................................... 23. FRONT DOOR LH HARNESS ........................... 71 .
DESCRIPTION ................................................... 23 . FRONT DOOR RH HARNESS ........................... 72 .
OPERATION PROCEDURE .............................. 23 . REAR DOOR LH HARNESS (KING CAB MOD-
INSPECTION IN AUTO ACTIVE TEST MODE ... 23 ELS) ................................................................... 73
.
Schematic ............................................................. 26
. REAR DOOR RH HARNESS (KING CAB MOD-
IPDM E/R Terminal Arrangement .......................... 27 . ELS) ................................................................... 74
.

Revision: September 2006 PG-1 2007 Frontier
REAR DOOR LH HARNESS (CREW CAB MOD- SRS COMPONENT TYPE) .................................86 .
ELS) .................................................................... 75
. ELECTRICAL UNITS ...............................................87 .
REAR DOOR RH HARNESS (CREW CAB MOD- Terminal Arrangement ............................................87 .
ELS) .................................................................... 76
. STANDARDIZED RELAY .........................................88 .
Wiring Diagram Codes (Cell Codes) ...................... 77 . Description .............................................................88
.
ELECTRICAL UNITS LOCATION ............................ 80 . NORMAL OPEN, NORMAL CLOSED AND
Electrical Units Location ........................................ 80 . MIXED TYPE RELAYS .......................................88 .
ENGINE COMPARTMENT ................................. 80 . TYPE OF STANDARDIZED RELAYS .................88 .
PASSENGER COMPARTMENT ......................... 81 . SUPER MULTIPLE JUNCTION (SMJ) .....................90 .
HARNESS CONNECTOR ........................................ 83 . Terminal Arrangement ............................................90 .
Description ............................................................. 83
. FUSE BLOCK-JUNCTION BOX (J/B) .....................92 .
HARNESS CONNECTOR (TAB-LOCKING Terminal Arrangement ............................................92 .
TYPE) ................................................................. 83
. FUSE AND FUSIBLE LINK BOX .............................93 .
HARNESS CONNECTOR (SLIDE-LOCKING Terminal Arrangement ............................................93 .
TYPE) ................................................................. 84
. FUSE AND RELAY BOX ..........................................94 .
HARNESS CONNECTOR (LEVER LOCKING Terminal Arrangement ............................................94 .
TYPE) ................................................................. 85
.
HARNESS CONNECTOR (DIRECT-CONNECT

Revision: September 2006 PG-2 2007 Frontier
PRECAUTIONS

PRECAUTIONS PFP:00011
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EKS00EOD

The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along B
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 C
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: D
G 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. E
G 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. F
G 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.
G

Revision: September 2006 PG-3 2007 Frontier
POWER SUPPLY ROUTING CIRCUIT

POWER SUPPLY ROUTING CIRCUIT PFP:24110

Schematic EKS00EOF

For detailed ground distribution, refer to PG-33, "Ground Distribution" .

WKWA5498E

Revision: September 2006 PG-4 2007 Frontier
POWER SUPPLY ROUTING CIRCUIT

WKWA5499E

Revision: September 2006 PG-5 2007 Frontier
POWER SUPPLY ROUTING CIRCUIT

Wiring Diagram -- POWER -- EKS00EOG

BATTERY POWER SUPPLY -- IGNITION SW. IN ANY POSITION

WKWA5500E

Revision: September 2006 PG-6 2007 Frontier
POWER SUPPLY ROUTING CIRCUIT

WKWA4466E

Revision: September 2006 PG-7 2007 Frontier
POWER SUPPLY ROUTING CIRCUIT

WKWA4467E

Revision: September 2006 PG-8 2007 Frontier
POWER SUPPLY ROUTING CIRCUIT

WKWA4468E

Revision: September 2006 PG-9 2007 Frontier
POWER SUPPLY ROUTING CIRCUIT

WKWA4469E

Revision: September 2006 PG-10 2007 Frontier
POWER SUPPLY ROUTING CIRCUIT

WKWA5501E

Revision: September 2006 PG-11 2007 Frontier
POWER SUPPLY ROUTING CIRCUIT

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

WKWA5502E

Revision: September 2006 PG-12 2007 Frontier
POWER SUPPLY ROUTING CIRCUIT

IGNITION POWER SUPPLY -- IGNITION SW. IN ON
A

WKWA5503E

Revision: September 2006 PG-13 2007 Frontier
POWER SUPPLY ROUTING CIRCUIT

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

WKWA5504E

Revision: September 2006 PG-14 2007 Frontier
POWER SUPPLY ROUTING CIRCUIT

WKWA5505E

Revision: September 2006 PG-15 2007 Frontier
POWER SUPPLY ROUTING CIRCUIT

IGNITION POWER SUPPLY -- IGNITION SWITCH IN START

WKWA4474E

Revision: September 2006 PG-16 2007 Frontier
POWER SUPPLY ROUTING CIRCUIT

Fuse EKS00HMD

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

D
CEL083

Fusible Link EKS00HME

E
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:
G If fusible link should melt, it is possible that critical circuit (power supply or large current carrying F
circuit) is shorted. In such a case, carefully check and eliminate cause of incident.
G Never wrap outside of fusible link with vinyl tape.
G Never let fusible link touch any other wiring harness, vinyl or rubber parts. G

Circuit Breaker (Built Into BCM) EKS00HMF

For example, when current is 30A, the circuit is broken within 8 to 20 H
seconds.
A circuit breaker is used for the following systems:
G Sunroof I

SBF284E PG

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

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

System Description EKS00EOH

G 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 relays via IPDM E/R control cir-
cuits.
G IPDM E/R-integrated control circuits perform ON-OFF operation of relays, CAN communication control,
etc.
G It controls operation of each electrical component via ECM, BCM and CAN communication lines.
CAUTION:
None of the IPDM E/R integrated relays can be removed.
SYSTEMS CONTROLLED BY IPDM E/R
1. Lamp control
Using CAN communication lines, it receives signals from the BCM and controls the following lamps:
G Headlamps (High, Low)

G Daytime light relay control (Canada only)

G Parking lamps

G Tail and license plate lamps

G Front fog lamps

2. Wiper control
Using CAN communication lines, it receives signals from the BCM and controls the front wipers.
3. Daytime light relay control
Using CAN communication lines, it receives signals from the BCM and controls the daytime light relay.
4. Generator control
Using CAN communication lines, it receives signals from the ECM and controls power generation output.
5. Rear window defogger relay control (Crew cab only)
Using CAN communication lines, it receives signals from the BCM and controls the rear window defogger
relay.
6. A/C compressor control
Using CAN communication lines, it receives signals from the BCM and controls the A/C compressor
(magnet clutch).
7. Starter control
Using CAN communication lines, it receives signals from the BCM and controls the starter relay.
8. Cooling fan control
Using CAN communication lines, it receives signals from the ECM and controls the cooling fan relays.
9. Horn control
Using CAN communication lines, it receives signals from the BCM and controls the horn 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 a maximum amount of information with minimum wiring. Each control unit can
transmit and receive data, and reads necessary information only.
1. Fail-safe control
G When CAN communication with other control units is impossible, IPDM E/R performs fail-safe control.
After CAN communication returns to normal operation, it also returns to normal control.
G Operation of control parts by IPDM E/R during fail-safe mode is as follows:

Controlled system Fail-safe mode
G With the ignition switch ON, the headlamp low is ON.
Headlamp
G With the ignition switch OFF, the headlamp low is OFF.
G With the ignition switch ON, the tail lamp relay is ON.
Tail license plate and parking lamps
G With the ignition switch OFF, the tail lamp relay is OFF.

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

Controlled system Fail-safe mode
A
G With the ignition switch ON, the cooling fan HI operates.
Cooling fan
G 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 it
Front wiper B
was in just before fail-safe control was initiated.
Rear window defogger Rear window defogger relay OFF
A/C compressor A/C compressor OFF C
Front fog lamps Front fog lamp relay OFF

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

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

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

G 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. G
3. Sleep status
G IPDM E/R operates in low current-consumption mode.

G CAN communication is stopped.
H
G When a change in CAN communication signal is detected, mode switches to CAN communication sta-
tus.
G When a change in ignition switch signal is detected, mode switches to CAN communication status.
I

CAN Communication System Description EKS00EOI

Refer to LAN-4, "SYSTEM DESCRIPTION" . J

Function of Detecting Ignition Relay Malfunction EKS00EOJ

G When the integrated ignition relay is stuck in a "closed contact" position and cannot be turned OFF, IPDM PG
E/R turns ON tail and parking lamps for 10 minutes to indicate IPDM E/R malfunction.
G When the state of the integrated ignition relay does not agree with the state of the ignition switch signal
received via CAN communication, the IPDM E/R activates the tail lamp relay. L
Ignition switch signal Ignition relay status Tail lamp relay
ON ON --
M
OFF OFF --
ON OFF --
OFF ON ON (10 minutes)

NOTE:
When the ignition switch is turned ON, the tail lamps are OFF.

Revision: September 2006 PG-19 2007 Frontier
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)

CONSULT-II Function (IPDM E/R) EKS00EOK

CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.
IPDM E/R Diagnostic Mode Description
SELF-DIAG RESULTS Displays IPDM E/R self-diagnosis results.
DATA MONITOR Displays IPDM E/R input/output data in real time.
CAN DIAG SUPPORT MNTR The result of transmit/receive diagnosis of CAN communication can be read.
ACTIVE TEST Operation of electrical loads can be checked by sending drive signal to them.

CONSULT-II START PROCEDURE
Refer to GI-38, "CONSULT-II Start Procedure" .
SELF-DIAGNOSTIC RESULTS
Display Item List
CONSULT-II TIME Possible causes
Display items Malfunction detection
display code CRNT PAST
NO DTC IS
DETECTED. FURTHER
-- -- -- -- --
TESTING MAY BE
REQUIRED.
G If CAN communication reception/transmission Any of items listed
data has a malfunction, or if any of the control below have errors:
units fail, data reception/transmission cannot be
CAN COMM CIRC U1000 X X G TRANSMIT DIAG
confirmed.
G ECM
G When the data in CAN communication is not
received before the specified time. G BCM/SEC

NOTE:
The details for display of the period are as follows:
G CRNT: Error currently detected with IPDM E/R.
G PAST: Error detected in the past and placed in IPDM E/R memory.

Revision: September 2006 PG-20 2007 Frontier
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)

DATA MONITOR
All Signals, Main Signals, Selection From Menu A
Monitor item selection
CONSULT-II
Item name Display or unit ALL MAIN SELECTION Description
screen display B
SIGNALS SIGNALS FROM MENU
MOTOR FAN
Motor fan request 1/2/3/4 X X X Signal status input from ECM
REQ
C
Compressor
AC COMP REQ ON/OFF X X X Signal status input from BCM
request
Parking, license
plate, and tail TAIL & CLR REQ ON/OFF X X X Signal status input from BCM D
lamp request
Headlamp low
HL LO REQ ON/OFF X X X Signal status input from BCM E
beam request
Headlamp high
HL HI REQ ON/OFF X X X Signal status input from BCM
beam request
Front fog lamps F
FR FOG REQ ON/OFF X X X Signal status input from BCM
request
Front wiper
FR WIP REQ STOP/1LO/LO/HI X X X Signal status input from BCM
request G
WIP AUTO
Wiper auto stop ACT P/STOP P X X X Output status of IPDM E/R
STOP
OFF/LS/HS/ H
Wiper protection WIP PROT X X X Control status of IPDM E/R
BLOCK
Starter request ST RLY REQ ON/OFF X X Signal status input from BCM
Ignition relay Ignition relay status monitored I
IGN RLY ON/OFF X X X
status with IPDM E/R
Rear defogger
RR DEF REQ ON/OFF X X X Signal status input from BCM
request J
Signal status input from IPDM
Hood switch HOOD SW (*1) OFF X
E/R
Theft warning PG
THFT HRN REQ ON/OFF X X Signal status input from BCM
horn request
Horn chirp HORN CHIRP ON/OFF X X Output status of IPDM E/R
Daytime lights L
DTRL REQ ON/OFF X X Signal status input from BCM
request
Oil pressure Signal status input from IPDM
OIL P SW OPEN/CLOSE X X
switch E/R M
NOTE:
G Perform monitoring of IPDM E/R data with the ignition switch ON. When the ignition switch is in ACC posi-
tion, display may not be correct.
G (*1) This item is displayed, but does not function.
CAN DIAG SUPPORT MNTR
Refer to LAN-4, "SYSTEM DESCRIPTION" .
ACTIVE TEST
Display Item List
Test name CONSULT-II screen display Description
With a certain ON-OFF operation, the rear defogger relay can be oper-
Rear defogger output REAR DEFOGGER
ated.
With a certain operation (OFF, HI ON, LO ON), the front wiper relay
Front wiper (HI, LO) output FRONT WIPER
(Lo, Hi) can be operated.

Revision: September 2006 PG-21 2007 Frontier
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)

Test name CONSULT-II screen display Description
Cooling fan output MOTOR FAN With a certain operation (1, 2, 3, 4), the cooling fan can be operated.
Headlamp relay (HI, LO) With a certain operation (OFF, HI ON, LO ON, TAIL ON, FOG ON), the
EXTERNAL LAMPS
output lamp relay (Low, High, Tail, Fog) can be operated.
Front fog lamp relay (FOG) With a certain operation (OFF, HI ON, LO ON, TAIL ON, FOG ON), the
EXTERNAL LAMPS
output lamp relay (Low, High, Tail, Fog) can be operated.
With a certain operation (OFF, HI ON, LO ON, TAIL ON, FOG ON), the
Tail lamp relay output EXTERNAL LAMPS
lamp relay (Low, High, Tail, Fog) can be operated.
Horn output HORN With a certain ON-OFF operation, the horn relay can be operated.

Revision: September 2006 PG-22 2007 Frontier
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)

Auto Active Test EKS00EOL

DESCRIPTION A
G 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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