2008 NISSAN LATIO Service Repair Manual

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NISSAN LATIO 2008 Service Repair Manual PG-16
< SERVICE INFORMATION >
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE
ROOM)
System DescriptionINFOID:0000000001704697
• IP

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< SERVICE INFORMATION >
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE
ROOM)
System DescriptionINFOID:0000000001704697
• 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.
• IPDM E/R-integrated control circuits perform ON-OFF operation of relays, CAN communication control, oil
pressure switch signal reception, etc.
• 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:
• Headlamps (High, Low)
• Parking lamps
• Tail and license plate lamps
• Front fog lamps
2. Wiper control
Using CAN communication lines, it receives signals from the BCM and controls the front wipers.
3. Rear window defogger relay control
Using CAN communication lines, it receives signals from the BCM and controls the rear window defogger
relay.
4. A/C compressor control
Using CAN communication lines, it receives signals from the ECM and controls the A/C compressor
(magnet clutch).
5. Starter control
Using CAN communication lines, it receives signals from the BCM and controls the starter relay.
6. Cooling fan control
Using CAN communication lines, it receives signals from the ECM and controls the cooling fan relays.
7. Horn control
Using CAN communication lines, it receives signals from the BCM and controls the horn relay.
8. Daytime light system control (Canada only)
Using CAN communication lines, it receives signals from the BCM and controls the daytime light 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
• 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.
• Operation of control parts by IPDM E/R during fail-safe mode is as follows:
Controlled system Fail-safe mode
Headlamp• With the ignition switch ON, headlamp low relay is ON, headlamp high relays are OFF, and
daytime light system (Canada only) is OFF.
• With the ignition switch OFF, the headlamp relays are OFF.
Tail, license plate and parking lamps • With the ignition switch ON, the tail lamp relay is ON.
• With the ignition switch OFF, the tail lamp relay is OFF.
Cooling fan• With the ignition switch ON, cooling fan relay-1, relay-2, and relay-3 are ON.
• With the ignition switch OFF, all cooling fan relays are OFF.
Front wiperUntil the ignition switch is turned off, the front wiper relays remain in the same status they
were in just before fail−safe control was initiated.

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NISSAN LATIO 2008 Service Repair Manual IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
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IPDM E/R STATUS CONTROL
In order to save power, IPDM E/R switches status by i

IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
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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
• CAN communication is normally performed with other control units.
• Individual unit control by IPDM E/R is normally performed.
• When sleep request signal is received from BCM, mode is switched to sleep waiting status.
2. Sleep waiting status
• Process to stop CAN communication is activated.
• All systems controlled by IPDM E/R are stopped. When 1 second has elapsed after CAN communica-
tion with other control units is stopped, mode switches to sleep status.
3. Sleep status
• IPDM E/R operates in low current-consumption mode.
• CAN communication is stopped.
• When a change in CAN communication signal is detected, mode switches to CAN communication sta-
tus.
• When a change in ignition switch signal is detected, mode switches to CAN communication status.
CAN Communication System DescriptionINFOID:0000000001704698
Refer to LAN-6, "System Description".
Function of Detecting Ignition Relay MalfunctionINFOID:0000000001704699
• When the integrated ignition relay is stuck in a "closed contact" position and cannot be turned OFF, IPDM E/
R turns ON tail and parking lamps for 10 minutes to indicate IPDM E/R malfunction.
• 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.
NOTE:
When the ignition switch is turned ON, the tail lamps are OFF.
CONSULT-III Function (IPDM E/R)INFOID:0000000001704700
CONSULT-III can display each diagnostic item using the diagnostic test modes shown following.
SELF-DIAGNOSTIC RESULTS
Display Item List
Rear window defogger Rear window defogger relay OFF
A/C compressor A/C relay is OFF
Front fog lamps Front fog lamp relay OFFControlled system Fail-safe mode
Ignition switch signal Ignition relay status Tail lamp relay
ON ON —
OFF OFF —
ON OFF —
OFF ON ON (10 minutes)
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.

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NISSAN LATIO 2008 Service Repair Manual PG-18
< SERVICE INFORMATION >
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
x: Applicable
NOTE:
The details for display of the period are as follows:
• CRNT: Error currently detected

PG-18
< SERVICE INFORMATION >
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
x: Applicable
NOTE:
The details for display of the period are as follows:
• CRNT: Error currently detected with IPDM E/R.
• PAST: Error detected in the past and placed in IPDM E/R memory.
DATA MONITOR
All Signals, Main Signals, Selection From Menu
Display itemsCONSULT-
III display
codeMalfunction detectionTIME
Possible causes
CRNT PAST
NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.—————
CAN COMM CIRC U1000• If CAN communication reception/transmission
data has a malfunction, or if any of the control
units fail, data reception/transmission cannot be
confirmed.
• When the data in CAN communication is not re-
ceived before the specified time.XXAny of items listed
below have errors:
• TRANSMIT DIAG
•ECM
• BCM/SEC
IGN RELAY ON —When the ignition switch is not in the ON position,
the ignition relay in the IPDM E/R is ON.XX
IGN RELAY OFF —When the ignition switch is not in the ON position,
the ignition relay in the IPDM E/R is OFF.XX
EEPROM —Malfunction is detected with the integrated EEPROM
memory diagnosis.XX
Item nameCONSULT-III
screen display Display or unitMonitor item selection
Description
ALL
SIGNALSMAIN
SIGNALSSELECTION
FROM MENU
Motor fan requestMOTOR FAN
REQ1/2/3/4 X X X Signal status input from ECM
Compressor re-
questAC COMP REQ ON/OFF X X X Signal status input from ECM
Parking, license,
and tail lamp re-
questTAIL & CLR REQ ON/OFF X X X Signal status input from BCM
Headlamp low
beam requestHL LO REQ ON/OFF X X X Signal status input from BCM
Headlamp high
beam requestHL HI REQ ON/OFF X X X Signal status input from BCM
Front fog request FR FOG REQ ON/OFF X X X Signal status input from BCM
FR wiper request FR WIP REQ STOP/1LO/LO/HI X X X Signal status input from BCM
Wiper auto stopWIP AUTO
STOPACT P/STOP P X X X Output status of IPDM E/R
Wiper protection WIP PROT OFF/LS/HS/Block X X X Control status of IPDM E/R
Starter request ST RLY REQ ON/OFF X X Status of input signal (*1)
Ignition relay
statusIGN RLY ON/OFF X X XIgnition relay status monitored
with IPDM E/R
Rear defogger re-
questRR DEF REQ ON/OFF X X X Signal status input from BCM
Oil pressure
switchOIL P SW OPEN/CLOSE X XSignal status input from IPDM
E/R
Hood switch HOOD SW (*2) OFF X XSignal status input from IPDM
E/R

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NISSAN LATIO 2008 Service Repair Manual IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
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*1 Perform monitoring of IPDM E/R data with the ignition switch ON. When the

IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
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*1 Perform monitoring of IPDM E/R data with the ignition switch ON. When the ignition switch is in ACC position, display may not be cor-
rect.
*2 This item is displayed, but does not function.
CAN DIAG SUPPORT MNTR
Refer to LAN-8 .
ACTIVE TEST
Display Item List
Auto Active TestINFOID:0000000001704701
DESCRIPTION
• In auto active test mode, operation inspection can be performed when IPDM E/R sends a drive signal to the
following systems:
- Rear window defogger
- Front wipers
- Tail, license and parking lamps
- Daytime lamp system (Canada only)
- Front fog lamps
- Headlamps (High, Low)
- A/C compressor (magnet clutch)
- Cooling fan
OPERATION PROCEDURE
1. Close hood and front door RH, and lift wiper arms away from windshield (to prevent glass damage by
wiper operation).
NOTE:
When auto active test is performed with hood opened, sprinkle water on windshield beforehand.
2. Turn ignition switch OFF.
3. Turn ignition switch ON and, within 20 seconds, press front door switch LH 20 times. Then turn ignition
switch OFF.
4. Turn ignition switch ON within 10 seconds after ignition switch OFF.
5. When auto active test mode is actuated, horn chirps once.
6. After a series of operations is repeated three times, auto active test is completed.
Theft warning
horn requestTHFT HRN REQ ON/OFF X X Signal status input from BCM
Horn chirp HORN CHIRP ON/OFF X X Output status of IPDM E/R
Daytime light re-
questDTRL REQ ON/OFF X X Signal status input from BCM Item nameCONSULT-III
screen display Display or unitMonitor item selection
Description
ALL
SIGNALSMAIN
SIGNALSSELECTION
FROM MENU
Test name CONSULT-III screen display Description
Head, tail, fog lamp output EXTERNAL LAMPSWith a certain ON-OFF operation (OFF, TAIL, LO, HI, FOG), the front
fog lamp, headlamp low, headlamp high RH, headlamp high LH, and
tail lamp relays can be operated.
Rear defogger output REAR DEFOGGERWith a certain ON-OFF operation, the rear defogger relay can be oper-
ated.
Front wiper (HI, LO) output FRONT WIPERWith a certain operation (OFF, HI ON, LO ON), the front wiper relays
(Lo, Hi) can be operated.
Cooling fan output MOTOR FANWith a certain operation (1, 2, 3, 4), the cooling fan relays can be oper-
ated.
Horn output HORN With a certain ON-OFF operation, the horn relay can be operated.

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NISSAN LATIO 2008 Service Repair Manual PG-20
< SERVICE INFORMATION >
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
NOTE:
When auto active test mode has to be cancelled halfway, turn ignition switch OFF.
CAUTION:
Be sure to p

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NISSAN LATIO 2008 Service Repair Manual IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
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• IPDM E/R actuates auto active test mode when

IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
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• IPDM E/R actuates auto active test mode when it receives door switch signal from BCM via CAN communi-
cation line. Therefore, when auto active test mode is activated successfully, CAN communication between
IPDM E/R and BCM is normal.
• If any of the systems controlled by IPDM E/R cannot be operated, possible cause can be easily diagnosed
using auto active test.
Diagnosis chart in auto active test mode
WKIA5665E
Symptom Inspection contents Possible cause
Rear window defogger
does not operate.Perform auto active
test. Does rear win-
dow defogger oper-
ate?YES • BCM signal input circuit
NO• Rear window defogger relay
• Open circuit of rear window defogger
• IPDM E/R malfunction
• Harness or connector malfunction between IPDM E/R and rear window
defogger
Any of front wipers, tail
and parking lamps, front
fog lamps, daytime light
system (Canada only),
and headlamps (High,
Low) do not operate.Perform auto active
test. Does system in
question operate?YES • BCM signal input system
NO• Lamp/wiper motor malfunction
• Lamp/wiper motor ground circuit malfunction
• Harness/connector malfunction between IPDM E/R and system in ques-
tion
• IPDM E/R (integrated relay) malfunction
A/C compressor does
not operate.Perform auto active
test. Does magnet
clutch operate?YES• BCM signal input circuit
• CAN communication signal between BCM and ECM
• CAN communication signal between ECM and IPDM E/R
NO• Magnet clutch malfunction
• Harness/connector malfunction between IPDM E/R and magnet clutch
• IPDM E/R (integrated relay) malfunction
Cooling fan does not op-
erate.Perform auto active
test. Does cooling fan
operate?YES• ECM signal input circuit
• CAN communication signal between ECM and IPDM E/R
NO• Cooling fan motor malfunction
• Harness/connector malfunction between IPDM E/R and cooling fan mo-
tor
• IPDM E/R (integrated relay) malfunction
Oil pressure warning
lamp does not operate.Perform auto active
test. Does oil pressure
warning lamp blink?YES• Harness/connector malfunction between IPDM E/R and oil pressure
switch
• Oil pressure switch malfunction
• IPDM E/R
NO• CAN communication signal between BCM and combination meter
• Combination meter

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NISSAN LATIO 2008 Service Repair Manual PG-22
< SERVICE INFORMATION >
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
IPDM E/R Terminal Arrangement
INFOID:0000000001704702
WKIA5666E

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NISSAN LATIO 2008 Service Repair Manual IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
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Terminal and Reference Value for IPDM E/RINFOID:0000000001704703
Te r m i n a

IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
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Terminal and Reference Value for IPDM E/RINFOID:0000000001704703
Te r m i n a lWire
colorSignal nameSignal
input/
outputMeasuring condition
Reference value
(Approx.) Ignition
switchOperation or condition
1 R Battery power supply Input OFF — Battery voltage
2 G Battery power supply Input OFF — Battery voltage
3YECM Relay Output—Ignition switch ON or START Battery voltage
Ignition switch OFF or ACC 0V
4GECM relay Output—Ignition switch ON or START Battery voltage
Ignition switch OFF or ACC 0V
6RDaytime light relay
controlInput ON Daytime light system active. Less than battery voltage
Daytime light system inactive. Battery voltage
7 G ECM relay control Input —Ignition switch ON or START 0V
Ignition switch OFF or ACC Battery voltage
8GThrottle control motor
relayOutput —Ignition switch ON or START Battery voltage
Ignition switch OFF or ACC 0V
11 W A/C compressor OutputON or
STARTA/C switch ON or defrost A/C
switchBattery voltage
A/C switch OFF or defrost A/C
switch0V
12 OIgnition switch sup-
plied powerInput —OFF or ACC 0V
ON or START Battery voltage
14LG
(M/T)
R
(A/T
or
CVT)Fuse 49 Output —Ignition switch ON or START Battery voltage
Ignition switch OFF or ACC 0V
15 V Fuse 50 Output —Ignition switch ON or START Battery voltage
Ignition switch OFF or ACC 0V
16 BR Fuse 51 Output —Ignition switch ON or START Battery voltage
Ignition switch OFF or ACC 0V
17 Y Battery power supply Output — — Battery voltage
19 R Starter motor Output START — Battery voltage
20L
(with
A/C)
LG
(with-
out A/
C)Cooling fan relay-1 Output —Conditions correct for cooling
fan low operation.Battery voltage
Conditions not correct for
cooling fan low operation.0V
22 G Battery power supply Input — — Battery voltage
23 L Cooling fan relay-2 Input —Conditions correct for cooling
fan high operationBattery voltage
Conditions not correct for
cooling fan high operation0V

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