Nissan Xterra. Manual - part 526

PCS

POWER CONSUMPTION CONTROL SYSTEM

PCS-7

< SYSTEM DESCRIPTION >

[IPDM E/R]

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POWER CONSUMPTION CONTROL SYSTEM

System Diagram

INFOID:0000000009483717

System Description

INFOID:0000000009483718

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

PCS-8

< SYSTEM DESCRIPTION >

[IPDM E/R]

POWER CONSUMPTION CONTROL SYSTEM

Component Parts Location

INFOID:0000000009483719

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

AWMIA0505ZZ

PCS

DIAGNOSIS SYSTEM (IPDM E/R)

PCS-9

< 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 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-24, "Descrip-

tion"

.

• 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.

WKIA4527E

Item Number

Test Item

Operation Time/Frequency

1

Rear window defogger

10 seconds

2

Front wipers

LOW 5 seconds then HIGH 5 seconds

3

License plate, tail, parking and fog lamps (if equipped)

10 seconds

PCS-10

< 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 mode

4

Headlamps

LOW 10 seconds then HIGH ON-OFF 5 times 

5

A/C compressor (magnet clutch)

ON-OFF 5 times

6

Cooling fan

LOW 5 seconds, then HIGH 5 seconds 

Item Number

Test Item

Operation Time/Frequency

AWMIA0528GB

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 front air control and 
BCM

• CAN communication signal 

between BCM and IPDM E/
R