Nissan Pathfinder (2009 year). Manual - part 527

PCS-6

< FUNCTION DIAGNOSIS >

[IPDM E/R]

RELAY CONTROL SYSTEM

System Description

INFOID:0000000003935616

IPDM E/R activates the internal control circuit to perform the relay ON-OFF control according to the input sig-
nals from various sensors and the request signals received from control units via CAN communication.

CAUTION:

IPDM E/R integrated relays cannot be removed.

Control relay

Input/output

Transmit unit

Control part

Reference 

page

Front fog lamp relay

Front fog lamp request signal

BCM (CAN)

Front fog lamps
(if equipped)

EXL-40

• Headlamp (LH) high relay
• Headlamp (RH) high relay
• Headlamp low relay

• High beam request signal
• Low beam request signal

BCM (CAN)

• Headlamp high
• Headlamp low

EXL-36
EXL-38

Tail lamp relay

Position light request signal

BCM (CAN)

• Parking  lamps
• License plate lamps
• Tail lamps
• Trailer tow relay
• Illumination system

EXL-42

• Front wiper relay
• Front wiper high relay

Front wiper request signal

BCM (CAN)

Front wiper motor

WW-4

Rear window defogger relay

Rear window defogger request signal

BCM (CAN)

Rear window defogger

DEF-4

A/C relay

A/C request signal

• BCM  (CAN)
• ECM  (CAN)

A/C compressor

HAC-68

Starter relay

Ignition switch START signal

TCM

Starter motor

STR-8

Cooling fan relay

Cooling fan request signal

ECM (CAN)

Cooling fan relay

CO-8

Heated mirror relay

Heated mirror request signal

BCM (CAN)

Door mirrors

DEF-13

ECM relay

ECM relay control signal

ECM (CAN)

ECM relay

EC-28

Throttle control motor relay

Throttle control motor control signal

ECM (CAN)

Throttle control motor relay

EC-36

Fuel pump relay

Fuel pump request signal

ECM (CAN)

Fuel pump

EC-398

Ignition relay

Ignition switch ON signal

Ignition switch

Ignition relay

EC-39

2009 Pathfinder

PCS

RELAY CONTROL SYSTEM

PCS-7

< FUNCTION DIAGNOSIS >

[IPDM E/R]

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Component Parts Location

INFOID:0000000003935617

1.

IPDM E/R E118, E119, E120, E121, 
E122, E123, E124

ALMIA0310ZZ

2009 Pathfinder

PCS-8

< FUNCTION DIAGNOSIS >

[IPDM E/R]

POWER CONTROL SYSTEM

POWER CONTROL SYSTEM

System Diagram

INFOID:0000000003935618

System Description

INFOID:0000000003935619

COOLING FAN CONTROL

IPDM E/R controls the cooling fan according to the status of the cooling fan speed request signal received
from ECM via CAN communication. Refer to 

LAN-57, "CAN System Specification Chart"

.

ALMIA0111GB

2009 Pathfinder

PCS

SIGNAL BUFFER SYSTEM

PCS-9

< FUNCTION DIAGNOSIS >

[IPDM E/R]

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SIGNAL BUFFER SYSTEM

System Diagram

INFOID:0000000003935620

System Description

INFOID:0000000003935621

IPDM E/R reads the status of the oil pressure switch and transmits the oil pressure switch signal to BCM via
CAN communication. Refer to 

BCS-12, "System Description"

.

AWNIA0174GB

2009 Pathfinder

PCS-10

< FUNCTION DIAGNOSIS >

[IPDM E/R]

POWER CONSUMPTION CONTROL SYSTEM

POWER CONSUMPTION CONTROL SYSTEM

System Diagram

INFOID:0000000003935622

System Description

INFOID:0000000003935623

OUTLINE

• IPDM E/R incorporates a power consumption control function that reduces the power consumption accord-

ing to the vehicle status. 

• IPDM E/R changes its status (control mode) with the sleep wake up signal received from BCM via CAN com-

munication.

Normal mode (wake-up)

- CAN communication is normally performed with other control units.
- Individual unit control by IPDM E/R is normally performed.

Low power consumption mode (sleep)

- Low power consumption control is active.
- CAN transmission is stopped.

SLEEP MODE ACTIVATION

• IPDM E/R judges that the sleep-ready conditions are fulfilled when the ignition switch is OFF and none of the

conditions below are present. Then it transmits a sleep-ready signal (ready) to BCM via CAN communica-
tion.

- Front wiper fail-safe operation 
- Outputting signals to actuators
- Switches or relays operating
- Auto active test is starting
- Emergency OFF
- Output requests are being received from control units via CAN communication.
• IPDM E/R stops CAN communication and enters the low power consumption mode when it receives a sleep

wake up signal (sleep) from BCM and the sleep-ready conditions are fulfilled.

WAKE-UP OPERATION

• IPDM E/R changes from the low power consumption mode to the normal mode when it receives a sleep

wake-up signal (wake up) from BCM or any of the following conditions is fulfilled. In addition, it transmits a
sleep-ready signal (not-ready) to BCM via CAN communication to report the CAN communication start.

- Ignition switch ON
- An output request is received from a control unit via CAN communication.

ALCIA0030GB

2009 Pathfinder

PCS

POWER CONSUMPTION CONTROL SYSTEM

PCS-11

< FUNCTION DIAGNOSIS >

[IPDM E/R]

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Component Parts Location

INFOID:0000000003935624

1.

IPDM E/R E118, E119, E120, E121, 
E122, E123, E124

2.

Combination meter M24

3.

BCM (view with lower instrument 
panel LH removed) M18, M19, M20

ALMIA0311ZZ

2009 Pathfinder

PCS-12

< FUNCTION DIAGNOSIS >

[IPDM E/R]

DIAGNOSIS SYSTEM (IPDM E/R)

DIAGNOSIS SYSTEM (IPDM E/R)

Diagnosis Description

INFOID:0000000003935625

AUTO ACTIVE TEST

Description

In auto active test mode, the IPDM E/R sends a drive signal to the following systems to check their operation.
• Oil pressure low warning indicator
• Oil pressure gauge
• Rear window defogger
• Front wipers
• Tail, license and parking lamps
• Front fog lamps (if equipped)
• Headlamps (Hi, Lo)
• A/C compressor (magnetic clutch)
• Cooling fan

Operation Procedure

1.

Close the hood and front door RH, and lift the wiper arms from the windshield (to prevent windshield dam-
age due to wiper operation).
NOTE:
When auto active test is performed with hood opened, sprinkle water on windshield before hand.

2.

Turn ignition switch OFF.

3.

Turn the ignition switch ON and, within 20 seconds, press the front door switch LH 10 times. Then turn the
ignition switch OFF.

4.

Turn the ignition switch ON within 10 seconds. After that the horn sounds once and the auto active test
starts.

5.

After a series of the following operations is repeated 3 times, auto active test is completed.

NOTE:
When auto active test mode has to be cancelled halfway through test, turn ignition switch OFF.

CAUTION:

• If auto active test mode cannot be actuated, check door switch system. Refer to 

DLK-57, "Descrip-

tion"

 (with Intelligent Key system), 

DLK-226, "Description"

 (without Intelligent Key system).

• Do not start the engine.

Inspection in Auto Active Test Mode

When auto active test mode is actuated, the following 7 steps are repeated 3 times.

Operation 
sequence

Inspection Location

Operation

1

Rear window defogger

10 seconds 

2

Front wipers

LO for 5 seconds 

→

 HI for 5 seconds

WKIA4991E

2009 Pathfinder

PCS

DIAGNOSIS SYSTEM (IPDM E/R)

PCS-13

< FUNCTION DIAGNOSIS >

[IPDM E/R]

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Concept of auto active test

• IPDM E/R starts the auto active test with the door switch signals transmitted by BCM via CAN communica-

tion. Therefore, the CAN communication line between IPDM E/R and BCM is considered normal if the auto
active test starts successfully.

• The auto active test facilitates troubleshooting if any systems controlled by IPDM E/R cannot be operated.

Diagnosis chart in auto active test mode

3

Tail, license, front fog and parking lamps

10 seconds

4

Headlamps

LO for 10 seconds 

→

 HI on-off for 5 seconds

5

A/C compressor (magnetic clutch)

ON 

⇔

 OFF 5 times

6

Cooling fan

10 seconds

Operation 
sequence

Inspection Location

Operation

AWMIA1124GB

Symptom

Inspection contents

Possible cause

Oil pressure low warning indicator does not operate

Perform auto active test.
Does the oil pressure low 
warning indicator operate?

YES

• IPDM E/R signal input cir-

cuit

• ECM signal input circuit
• CAN communication signal 

between ECM and combi-
nation meter

NO

• CAN communication signal 

between IPDM E/R, BCM 
and combination meter

Oil pressure gauge does not operate

Perform auto active test.
Does the oil pressure gauge 
operate?

YES

IPDM E/R signal input circuit

NO

• CAN communication signal 

between IPDM E/R, BCM 
and combination meter

Rear window defogger does not operate

Perform auto active test.
Does the rear window defog-
ger operate?

YES

BCM signal input circuit

NO

• Harness or connector be-

tween A/C and AV switch 
assembly and AV control 
unit

• CAN communication signal 

between BCM and IPDM E/
R

2009 Pathfinder