INFINITI FX35 2008 Service Manual

IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
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IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE
ROOM)
System DescriptionINFOID:0000000001328870
 IPDM E/R (Intelligent Power Distribution Module Engi ne Room) integrates the relay box and fuse block
which were originally placed in engine compartment. It c ontrols integrated relay via IPDM E/R control circuit.
 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.
 It controls operation of each electrical pa rt via ECM, BCM and CAN communication lines.
CAUTION:
None of the IPDM E/R-integr ated relays can be removed.
SYSTEMS CONTROLLED BY IPDM E/R
IPDM E/R receives a request signal fr om each control unit with CAN communication. It controls each system.
CAN COMMUNICATION LINE CONTROL
With CAN communication, by connecting each control uni t using two communication lines (CAN-L line, CAN-H
line), it is possible to transmit maximum amount of in formation with minimum wiring. Each control unit can
transmit and receive data, and reads necessary information only.
Fail- Safe Control
 When CAN communication with other control units is impos sible, IPDM E/R performs fail-safe control. After
CAN communication recovers normally, it also returns to normal control.
 Operation of control parts by IPDM E/R during fail-safe mode is as follows:
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.
Control system Transmit control unit Control part
Lamp control BCM  Headlamps (HI, LO)
 Front fog lamps
 Parking, license plate, side marker and tail lamps
Wiper control BCM Front wipers
Rear window defogger control BCM Rear window defogger
A/C compressor control ECM A/C compressor (magnet clutch)
Cooling fan control ECM Cooling fan
Horn control BCM Horn
Controlled system Fail-safe mode
Headlamp  With the ignition switch ON, the headlamp (low) is ON.
 With the ignition switch OFF, the headlamp (low) is OFF.
Parking, license plate side marker, and
tail lamps  With the ignition switch ON, the parking, license plate, side marker and tail lamps is ON.
 With the ignition switch OFF, the parking, license plate, side marker and tail lamps is OFF.
Cooling fan  With the ignition switch ON, the cooling fan HI operates.
 With the ignition switch OFF, the cooling fan stops.
Front wiper Until the ignition switch is turned OFF, the front wiper LO and HI remains in the same status
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
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IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
 All systems controlled by IPDM E/R are stopped. When 3 seconds have elapsed after CAN communica-
tion with other control units is st opped, mode switches to sleep status.
3. Sleep status  IPDM E/R operates in low power mode.
 CAN communication is stopped.
 When a change in CAN communication line is detected, mode switches to CAN communication status.
 When a change hood switch or ignition switch signal is detected, mode switches to CAN communication
status.
CAN Communication System DescriptionINFOID:0000000001328871
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/recei ves data but selectively reads required data only.
CAN Communication UnitINFOID:0000000001328872
Refer to LAN-43, "CAN System Specification Chart".
Function of Detecting I gnition Relay MalfunctionINFOID:0000000001328873
 When contact point of integrated ignition relay is st uck and cannot be turned OFF, IPDM E/R turns ON park-
ing, license plate, side marker and tail lamps for 10 minutes to indicate ignition relay malfunction.
 When a state of ignition relay having built-in does not agr ee with a state of ignition switch signal input by a
CAN communication from BCM, IPDM E/R lets tail lamp relay operate.
NOTE:
When the ignition switch is turned ON, the tail lamps are OFF.
CONSULT-III Function (IPDM E/R)INFOID:0000000001328874
CONSULT-III can display each diagnostic item using the diagnostic test mode shown following.
Self Diagnostic Result
Display Item List
Ignition switch signal Ignition relay status Tail lamp relay
ON ON —
OFF OFF — ON OFF —
OFF ON ON (10 minutes)
Inspection Item, Diagnosis Mode Description
Self Diagnostic Result The IPDM E/R performs diagnosis of the CAN communication and self-diagnosis.
Data Monitor The input/output data of the IPDM E/R is displayed in real time.
CAN Diag Support Monitor The result of transmit/receive diagnosis of CAN communication can be read.
Active test The IPDM E/R sends a drive signal to electronic components to check their operation.
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IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
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NOTE: The details for display of the period are as follows:
 CRNT: Error currently de tected with IPDM E/R.
 PAST: Error detected in the past and memorized with IPDM E/R.
DATA MONITOR
NOTE:
 Perform monitoring of IPDM E/R data with the ignition switch ON. When the ignition switch is at ACC, the display may not be co rrect.
 *1: The vehicle without the Intelligent Key system displays only ON without change.
 *2:The cornering lamp item is displayed, but it cannot be monitored.
ACTIVE TEST
DTC Display Items Malfunction detecting condition TIME
Possible causes
CRNT PAST
— NO DTC IS DETECT-
ED.FURTHER TEST-
ING MAY BE
REQUIRED. ————
U1000 CAN COMM CIRCUIT  If CAN communication reception/transmission
data has a malfunction, or if any of the control
units malfunction, data reception/transmission
cannot be confirmed.
 When the data in CAN communication is not re- ceived before the specified time ××
Any of or several items
below have errors.
 TRANSMIT DIAG
ECM
 BCM/SEC
Item name
CONSULT-III screen dis-
play Display or unit MAIN SIG-
NALS Description
Motor fan request MOTOR FAN REQ 1/2/3/4 ×Signal status input from ECM
Compressor request A C COMP REQ On/Off ×Signal status input from ECM
Tail & clear request TAIL&CLR REQ On/Off ×Signal status input from BCM
H/L LO request HL LO REQ On/Off ×Signal status input from BCM
H/L HI request HL HI REQ On/Off ×Signal status input from BCM
FR fog request FR FOG REQ On/Off ×Signal status input from BCM
FR wiper request FR WIP REQ Stop/1LOW/Lo/Hi ×Signal status input from BCM
Wiper auto stop WIP AUTO STOP ACT P/STOP P ×Output status of IPDM E/R
Wiper protection WIP PROT Off/BLOCK ×Control status of IPDM E/R
Starter request ST RLY REQ
*1On/Off Status of input signal
Ignition relay status IGN RLY On/Off ×Ignition relay status monitored with
IPDM E/R
Rear window defogger re-
quest RR DEF REQ On/Off
×Signal status input from BCM
Oil pressure switch OIL P SW Open/Close Signal status input in IPDM E/R
Hood switch HOOD SW On/Off Input signal status
Theft warning horn re-
quest THFT HRN REQ On/Off Signal st
atus input from BCM
Horn chirp HORN CHIRP On/Off Ou tput status of IPDM E/R
Cornering lamp request CRNRNG LMP REQ
*2Off Signal status input from BCM
Test item CONSULT-III screen display Description
Tail lamp operation TAIL LAMP With a certain On-Off operation, the tail lamp relay can be operated.
Rear window defogger opera-
tion REAR DEFOGGER
With a certain On-Off operation, the rear window defogger relay can be
operated.
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IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
NOTE:
This item is displayed, but cannot be tested.
Auto Active TestINFOID:0000000001328875
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
 Parking, license plate, side marker and tail lamps
 Front fog lamps
 Headlamps (Hi, Lo)
 A/C compressor (magnetic clutch)
 Cooling fan
OPERATION PROCEDURE
1. Close hood and front door (passenger side), and then 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, pre ss drivers door switch 10 times (close other doors).
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 chir ps once oil pressure warning lamp starts blinking.
6. After a series of operations is repeated three times, auto active test is completed. NOTE:
When auto active test mode has to be cancelled halfway, turn ignition switch OFF.
CAUTION:
Be sure to inspect BL-38, "
Check Door Switch" when the auto active t est cannot be performed.
INSPECTION IN AUTO ACTIVE TEST MODE
When auto active test mode is actuated, the following eight steps are repeated three times.
Front wiper (HI, LO) operation FRONT WIPER With a certain operation (Off, Hi, Lo),
the front wiper relay (Lo, Hi) can
be operated.
Cooling fan operation MOTOR FAN With a certain operation (1, 2, 3, 4), the cooling fan can be operated.
Lamp (HI, LO, FOG) opera-
tion LAMPSWith a certain operation (Off, Hi, Lo, Fog), the lamp relay (Lo, Hi, Fog)
can be operated.
Cornering lamp operation CORNERING LAMP
NOTE—
Horn operation HORN With a certain On-Off operation, the horn relay can be operated. Test item CONSULT-III screen display Description
PKIB6583E
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IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
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NOTE:
Turns ON-OFF the solenoid to switch Hi/Lo. In this case, the bulb does not illuminate.
Concept of Auto Active Test
 IPDM E/R actuates auto active test mode when it re ceives 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 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
Symptom Inspection contents Possible cause
Any of front wipers, tail
and parking lamps, front
fog lamps, and head
lamps (Hi, Lo) do not op-
erate. Perform auto active
test. Does system in
question operate?YES  BCM signal input system malfunction
NO  Lamp/wiper motor malfunction
 Lamp/wiper motor ground circuit malfunction
 Harness/connector malfunction between IPDM E/R and system in question
 IPDM E/R (integrated relay) malfunction
Rear window defogger
does not operate. Perform auto active
test. Does rear win-
dow defogger oper-
ate?YES  BCM signal input circuit malfunction
NO  Rear window defogger relay malfunction
 Harness/connector malfunction between IPDM E/R and rear window de-
fogger relay.
 Open circuit of rear window defogger
IPDM E/R malfunction
A/C compressor does
not operate. Perform auto active
test. Does magnetic
clutch operate?YES
 BCM signal input circuit malfunction
 CAN communication signal between BCM and ECM.
 CAN communication signal between ECM and IPDM E/R
NO  Magnetic clutch malfunction
 Harness/connector malfunction between IPDM E/R and magnetic 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 motor
 IPDM E/R (integrated relay) malfunction
Oil pressure warning
lamp does not operate. Perform auto active
test. Does oil pres-
sure warning lamp
blink?YES
 Harness/connector malfunction between IPDM E/R and oil pressure switch
 Oil pressure switch malfunction
IPDM E/R malfunction
NO  CAN communication signal between BCM and unified meter and A/C amp.
 Combination meter
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IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
Schematic
INFOID:0000000001328876
TKWM4469E
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IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
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IPDM E/R Terminal ArrangementINFOID:0000000001328877
IPDM E/R Power/Ground Circuit InspectionINFOID:0000000001370717
1.CHECK FUSE AND FUSIBLE LINK
Make sure the following fusible links or IPDM E/R fuses are not blown.
CKIM0237E
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IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
OK or NG
OK >> GO TO 2.
NG >> If fuse or fusible link blown, be sure to e liminate cause of malfunction before installing new one.
2.CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R harness connector.
3. Check voltage between IPDM E/R harness connector and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connector.
3.CHECK GROUND CIRCUIT
1. Disconnect IPDM E/R harness connectors.
2. Check continuity between IPDM E/R harness connectors and ground.
OK or NG
OK >> INSPECTION END
NG >> Repair harness or connector.
U1000 CAN COMM CIRCUITINFOID:0000000001366489
1.PERFORM SELF DIAGNOSTIC
1. Turn ignition switch ON and wait for 2 seconds or more.
2. Check “Self Diagnostic Result” of IPDM E/R.
Is
“CAN COMM CIRCUIT” displayed?
YES >> Refer to LAN-43, "CAN System Specification Chart".
NO >> Refer to GI-25, "
How to Perform Efficient Diagnosis for an Electrical Incident".
Removal and Installation of IPDM E/RINFOID:0000000001328880
REMOVAL
1. Remove battery. Refer to SC-6, "Removal and Installation".
Terminal No. Power source Fuse and fusible link No.
1
Battery power E
2 C
— 71
78
Te r m i n a l s
Voltage (Ap-
prox.)
(+) (-)
IPDM E/R connector Terminal Ground
E3 1
Battery voltage
2
PKIB6562E
IPDM E/R connector Terminal
GroundContinuity
E8 38
E9 50
Ye s
60
SKIA6184E
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IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
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2. Remove IPDM E/R cover A. While pressing pawl on backside of IPDM E/R cover B toward vehicle front to unlock, lift up IPDM E/
R.
3. While pressing pawls on right and left side of IPDM E/R, remove IPDM E/R cover B from IPDM E/R.
4. Remove harness connector from IPDM E/R.
INSTALLATION
Installation is the reverse order of removal.
SKIA4968E
SKIA1902E
SKIA4969E
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GROUND
GROUND
Ground DistributionINFOID:0000000001328881
MAIN HARNESS
CKIM0639E
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