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
INFOID:0000000009483720
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
.
• 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
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