Infiniti QX56 (Z62). Manual - part 963

 

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Infiniti QX56 (Z62). Manual - part 963

 

 

PCS-8

< SYSTEM DESCRIPTION >

[IPDM E/R]

SYSTEM

POWER CONTROL SYSTEM : System Diagram

INFOID:0000000006220164

POWER CONTROL SYSTEM : System Description

INFOID:0000000006220165

COOLING FAN CONTROL

IPDM E/R outputs cooling fan control signal (PWM signal) to the electrically-controlled cooling fan coupling
according to the status of the cooling fan speed request signal received from ECM via CAN communication.
Refer to 

EC-41, "COOLING FAN CONTROL : System Diagram"

.

ALTERNATOR CONTROL

IPDM E/R outputs power generation command signal (PWM signal) to the alternator according to the status of
the power generation command value signal received from ECM via CAN communication. Refer to 

CHG-7,

"POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM : System Diagram"

.

SIGNAL BUFFER SYSTEM

SIGNAL BUFFER SYSTEM : System Diagram

INFOID:0000000006220166

SIGNAL BUFFER SYSTEM : System Description

INFOID:0000000006220167

• 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 

MWI-15, "OIL PRESSURE WARNING LAMP : System Diagram"

.

• IPDM E/R reads the status of the hood switch and transmits the hood switch signal to BCM via CAN commu-

nication. Refer to 

SEC-17, "VEHICLE SECURITY SYSTEM : System Diagram"

.

• IPDM E/R receives the rear window defogger control signal from BCM via CAN communication and trans-

mits it to ECM and AV control unit via CAN communication. Refer to 

DEF-6, "System Diagram"

.

POWER CONSUMPTION CONTROL SYSTEM

JMMIA0491GB

JPMIA0952GB

PCS

SYSTEM

PCS-9

< SYSTEM DESCRIPTION >

[IPDM E/R]

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POWER CONSUMPTION CONTROL SYSTEM : System Diagram

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POWER CONSUMPTION CONTROL SYSTEM : System Description

INFOID:0000000006220169

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.

- Outputting signals to actuators
- Switches or relays operating
- 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.

JMMIA0382GB

PCS-10

< SYSTEM DESCRIPTION >

[IPDM E/R]

DIAGNOSIS SYSTEM (IPDM E/R)

DIAGNOSIS SYSTEM (IPDM E/R)

Diagnosis Description

INFOID:0000000006220170

AUTO ACTIVE TEST

Description

In auto active test, the IPDM E/R sends a drive signal to the following systems to check their operation.
• Oil pressure warning lamp
• Rear window defogger
• Front wiper (LO, HI)
• Parking lamp
• License plate lamp
• Tail lamp
• Side marker lamp
• Front fog lamp
• Headlamp (LO, HI)
• A/C compressor (magnet clutch)

Operation Procedure

CAUTION:

Never perform auto active test in the following conditions.
• Engine is running.
• CONSULT-III is connected.

1.

Close the hood and lift the wiper arms from the windshield. (Prevent windshield damage due to wiper
operation)
NOTE:
When auto active test is performed with hood opened, sprinkle water on windshield beforehand.

2.

Turn the ignition switch OFF.

3.

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

CAUTION:

Close passenger door.

4.

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

CAUTION:

Engine starts when ignition switch is turned ON while brake pedal is depressed.

5.

The oil pressure warning lamp starts blinking when the auto active test starts.

6.

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

NOTE:
• When auto active test has to be cancelled halfway through test, turn the ignition switch OFF.
• When auto active test is not activated, door switch may be the cause. Check door switch. Refer to 

DLK-117,

"Component Function Check"

.

Inspection in Auto Active Test

When auto active test is actuated, the following operation sequence is repeated 3 times.

Operation 
sequence

Inspection location

Operation

1

Oil pressure warning lamp

Blinks continuously during operation of auto active test 

2

Rear window defogger

10 seconds

3

Front wiper

LO for 5 seconds 

 HI for 5 seconds

4

• Parking  lamp
• License plate lamp
• Tail lamp
• Side marker lamp
• Front fog lamp

10 seconds

PCS

DIAGNOSIS SYSTEM (IPDM E/R)

PCS-11

< SYSTEM DESCRIPTION >

[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

5

Headlamp

LO for 10 seconds 

HI ON 

 OFF 5 times

6

A/C compressor (magnet clutch)

ON 

 OFF 5 times

Operation 
sequence

Inspection location

Operation

JMMIA0492GB

Symptom

Inspection contents

Possible cause

Rear window defogger does not operate

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

YES

BCM signal input circuit

NO

• Rear window defogger
• Rear window defogger 

ground circuit

• Harness or connector be-

tween IPDM E/R and rear 
window defogger

• IPDM E/R

Any of the following components do not operate

• Parking  lamp
• License plate lamp
• Tail  lamp
• Side marker lamp
• Front fog lamp
• Headlamp (HI, LO)
• Front wiper (HI, LO)

Perform auto active test.
Does the applicable system 
operate?

YES

BCM signal input circuit

NO

• Lamp or motor
• Lamp or motor ground cir-

cuit

• Harness or connector be-

tween IPDM E/R and appli-
cable system

• IPDM E/R

A/C compressor does not operate

Perform auto active test.
Does the magnet clutch oper-
ate?

YES

• A/C auto amp. signal input 

circuit

• CAN communication signal 

between A/C auto amp. and 
ECM

• CAN communication signal 

between ECM and IPDM E/
R

NO

• Magnet clutch
• Harness or connector be-

tween IPDM E/R and mag-
net clutch

• IPDM E/R

 

 

 

 

 

 

 

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