Nissan Quest E52. Manual - part 928

PCS

SYSTEM

PCS-9

< SYSTEM DESCRIPTION >

[IPDM E/R]

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

mits it to ECM via CAN communication. Refer to 

DEF-7, "System Description"

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POWER CONSUMPTION CONTROL SYSTEM

POWER CONSUMPTION CONTROL SYSTEM : System Diagram

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POWER CONSUMPTION CONTROL SYSTEM : System Description

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SYSTEM DIAGRAM

DESCRIPTION

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

JMMIA0859GB

PCS-10

< SYSTEM DESCRIPTION >

[IPDM E/R]

SYSTEM

• 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.

PCS

DIAGNOSIS SYSTEM (IPDM E/R)

PCS-11

< SYSTEM DESCRIPTION >

[IPDM E/R]

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DIAGNOSIS SYSTEM (IPDM E/R)

Diagnosis Description

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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
• 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)
• Cooling fan

Operation Procedure

NOTE:
Never perform auto active test in the following condition.
• Passenger door is open.
• CONSULT 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 front door switch (driver side) 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.
NOTE:
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-241,

"Component Function Check"

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Inspection in Auto Active Test

When auto active test is actuated, the following 6 steps are repeated 3 times.

Operation 
sequence

Inspection location

Operation

1

Oil pressure warning lamp

Blinks continuously during operation of auto active test 

2

Front wiper motor

LO for 5 seconds 

→

 HI for 5 seconds

3

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

10 seconds

4

Headlamp

• LO 10 seconds
• HI  ON 

⇔

 OFF 5 times

5

A/C compressor (magnet clutch)

ON 

⇔

 OFF 5 times

6

Cooling fan

LO for 5 seconds 

→

MID for 3 seconds 

→

 HI for 2 seconds

PCS-12

< SYSTEM DESCRIPTION >

[IPDM E/R]

DIAGNOSIS SYSTEM (IPDM E/R)

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

JMMIA0836GB

Symptom

Inspection contents

Possible cause

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 motor

Perform auto active test.
Does the applicable system op-
erate?

YES

BCM signal input circuit

NO

• Lamp or motor
• Lamp or motor ground circuit
• Harness or connector between IPDM E/

R and applicable system

• IPDM E/R

A/C compressor does not operate

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

YES

• Combination meter signal input circuit
• CAN communication signal between 

Combination meter and ECM

• CAN communication signal between 

ECM and IPDM E/R

NO

• Magnet clutch
• Harness or connector between IPDM E/

R and magnet clutch

• IPDM E/R

Oil pressure warning lamp does not operate

Perform auto active test.
Does the oil pressure warning 
lamp blink?

YES

• Harness or connector between IPDM E/

R and oil pressure switch 

• Oil pressure switch
• IPDM E/R

NO

• CAN communication signal between 

IPDM E/R and BCM

• CAN communication signal between 

BCM and Combination meter

• Combination meter