Infiniti FX35 / FX45. Manual - part 846

IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)

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IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE
ROOM)

System Description

INFOID:0000000001328870

• 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 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 part 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

IPDM E/R receives a request signal from each control unit with CAN communication. It controls each system.

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 reads necessary information only.

Fail- Safe Control

• 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.

• 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 stopped, 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 Description

INFOID: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/receives data but selectively reads required data only.

CAN Communication Unit

INFOID:0000000001328872

Refer to 

LAN-43, "CAN System Specification Chart"

.

Function of Detecting Ignition Relay Malfunction

INFOID:0000000001328873

• When contact point of integrated ignition relay is stuck 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 agree 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.

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 detected 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 correct.

• *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

AC 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

*1

On/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 status input from BCM

Horn chirp

HORN CHIRP

On/Off

Output status of IPDM E/R

Cornering lamp request

CRNRNG LMP REQ

*2

Off

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 Test

INFOID: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, press 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 chirps 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 test 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

LAMPS

With 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