200 INFINITI QX56 2009 Factory Service Manual

MWI-12
< FUNCTION DIAGNOSIS >
METER SYSTEM
ENGINE COOLANT TEMPERATURE GAUGE : Component Description
INFOID:0000000003776596
FUEL GAUGE
FUEL GAUGE : System DiagramINFOID:0000000003776597
FUEL GAUGE : System DescriptionINFOID:0000000003776598
The fuel gauge indicates the approximate fuel level in the fuel tank.
The fuel gauge is regulated by the unified meter control unit and a variable resistor signal supplied by the fuel
level sensor unit.
FUEL GAUGE : Compone nt Parts LocationINFOID:0000000003776599
Unit Description
Combination meter Indicates the engine coolant temperature according to the engine coolant temperature signal re-
ceived from ECM via CAN communication.
ECM Transmits the engine coolant temperature signal to the combination meter via CAN communication.
AWNIA0004GB
AWNIA0201ZZ
Revision: December 20092009 QX56

MWI
METER SYSTEMMWI-13
< FUNCTION DIAGNOSIS >
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O PFUEL GAUGE : Component DescriptionINFOID:0000000003776600
ENGINE OIL PRESSURE GAUGE
ENGINE OIL PRESSURE GAUGE : System DiagramINFOID:0000000003776601
ENGINE OIL PRESSURE GAUGE : System DescriptionINFOID:0000000003776602
The engine oil pressure gauge indicates whether the engine oil pressure is low or normal.
The oil pressure gauge is controlled by the IPDM E/R. The IPDM E/R reads the ON /OFF signals from the oil
pressure switch and transmits the oil pressure switch signal to the combination meter via BCM with the CAN
communication line. The oil pressure gauge displays a low or normal indication according to the oil pressure
switch signal received via CAN communication.
1. IPDM E/R E122, E124 2. Combination meter M23, M24 3. Fuel level sensor unit and fuel pump
C5 (view with inspection hole cover re-
moved)
4. ECM E16 (view with battery removed) 5. ABS actuator and electric unit (control unit) E1256. Oil pressure switch F4
A: Oil pan (upper)
7. A/T assembly F9 8. BCM M18, M19 (view with instrument
lower panel LH removed)
Unit Description
Combination meter Indicates the fuel level according to the fuel level sensor signal received from the fuel level sensor
unit.
Fuel level sensor unit Refer to MWI-33, "
Description".
AWNIA0174GB
Revision: December 20092009 QX56

MWI-14
< FUNCTION DIAGNOSIS >
METER SYSTEM
ENGINE OIL PRESSURE GAUGE : Component Parts Location
INFOID:0000000003776603
ENGINE OIL PRESSURE GAUGE : Component DescriptionINFOID:0000000003776604
VOLTAGE GAUGE
1. IPDM E/R E122, E124 2. Combination meter M23, M24 3. Fuel level sensor unit and fuel pump
C5 (view with inspection hole cover re-
moved)
4. ECM E16 (view with battery removed) 5. ABS actuator and electric unit (control
unit) E125 6. Oil pressure switch F4
A: Oil pan (upper)
7. A/T assembly F9 8. BCM M18, M19 (view with instrument
lower panel LH removed)
AWNIA0201ZZ
Unit Description
Combination meter Indicates the engine oil pressure (low/normal) according to the oil pressure switch signal received
from BCM with CAN
communication line.
IPDM E/R Reads the ON/OFF signals from the oil pressure switch and transmits the oil pressure switch signal
to the combination meter via BCM with the CAN communication line.
Oil pressure switch Refer to MWI-35, "
Description".
BCM Transmits the oil pressure switch signal received from IPDM E/R via CAN communication to the
combination meter via CAN communication.
Revision: December 20092009 QX56

MWI
METER SYSTEMMWI-15
< FUNCTION DIAGNOSIS >
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VOLTAGE GAUGE : System DiagramINFOID:0000000003776605
VOLTAGE GAUGE : System DescriptionINFOID:0000000003776606
The voltage gauge indicates the battery/charging system voltage.
The voltage gauge is regulated by the unified meter control unit.
VOLTAGE GAUGE : Component Parts LocationINFOID:0000000003776607
AWNIA0106GB
1. IPDM E/R E122, E124 2. Combination meter M23, M24 3. Fuel level sensor unit and fuel pump
C5 (view with inspection hole cover re-
moved)
4. ECM E16 (view with battery removed) 5. ABS actuator and electric unit (control unit) E1256. Oil pressure switch F4
A: Oil pan (upper)
7. A/T assembly F9 8. BCM M18, M19 (view with instrument
lower panel LH removed)
AWNIA0201ZZ
Revision: December 20092009 QX56

MWI-16
< FUNCTION DIAGNOSIS >
METER SYSTEM
VOLTAGE GAUGE : Component Description
INFOID:0000000003776608
ODO/TRIP METER
ODO/TRIP METER : System DiagramINFOID:0000000003776609
ODO/TRIP METER : System DescriptionINFOID:0000000003776610
The vehicle speed signal and the memory signals from the meter memory circuit are processed by the combi-
nation meter and the mileage is displayed.
HOW TO CHANGE THE DISPLAY FOR ODO/TRIP METER
Refer to Owner's Manual for odo/tr ip meter operating instructions.
ODO/TRIP METER : Component Parts LocationINFOID:0000000003776611
Unit Description
Combination meter Indicates the battery voltage according to the voltage signal received from the fuse block (J/B).
Fuse block (J/B) Transmits the battery voltage signal to the combination meter.
AWNIA0005GB
AWNIA0201ZZ
Revision: December 20092009 QX56

MWI
METER SYSTEMMWI-17
< FUNCTION DIAGNOSIS >
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O PODO/TRIP METER : Component DescriptionINFOID:0000000003776612
SHIFT POSITION INDICATOR
SHIFT POSITION INDICATOR : System DiagramINFOID:0000000003776613
SHIFT POSITION INDICATOR : System DescriptionINFOID:0000000003776614
The TCM receives A/T indicator signals from the tr ansmission range switch. The TCM then sends A/T position
indicator signals to the combination meter via CAN co mmunication lines. The combination meter indicates the
received shift position.
1. IPDM E/R E122, E124 2. Combination meter M23, M24 3. Fuel level sensor unit and fuel pump
C5 (view with inspection hole cover re-
moved)
4. ECM E16 (view with battery removed) 5. ABS actuator and electric unit (control unit) E1256. Oil pressure switch F4
A: Oil pan (upper)
7. A/T assembly F9 8. BCM M18, M19 (view with instrument
lower panel LH removed)
Unit Description
Combination meter Converts the vehicle speed signal
received from the ABS actuator and electric unit (control unit) via
CAN communication to mileage, and it displays the accumulated mileage to the odo/trip meter.
ABS actuator and electric unit
(control unit) Transmits the vehicle speed signal to the combination meter via CAN communication.
AWNIA1906GB
Revision: December 20092009 QX56

MWI-18
< FUNCTION DIAGNOSIS >
METER SYSTEM
SHIFT POSITION INDICATOR : Component Parts Location
INFOID:0000000003776615
SHIFT POSITION INDICATOR : Component DescriptionINFOID:0000000003776616
WARNING LAMPS/INDICATOR LAMPS
WARNING LAMPS/INDICATOR LAMPS : System DiagramINFOID:0000000003776617
1. IPDM E/R E122, E124 2. Combination meter M23, M24 3. Fuel level sensor unit and fuel pump
C5 (view with inspection hole cover re-
moved)
4. ECM E16 (view with battery removed) 5. ABS actuator and electric unit (control
unit) E125 6. Oil pressure switch F4
A: Oil pan (upper)
7. A/T assembly F9 8. BCM M18, M19 (view with instrument
lower panel LH removed)
AWNIA0201ZZ
Unit Description
Combination meter Displays the shift position on the information display using shift position signal received from TCM.
TCM Transmits the shift position signal to the combination meter via CAN communication.
JSNIA0449GB
Revision: December 20092009 QX56

MWI
METER SYSTEMMWI-19
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WARNING LAMPS/INDICATOR LAMPS : System DescriptionINFOID:0000000003776618
OIL PRESSURE WARNING LAMP
• IPDM E/R reads the ON/OFF signals from the oil pressure switch and transmits the oil pressure switch sig-
nal to the combination meter via BCM with the CAN communication line.
• The combination meter turns the oil pressure warning lamp ON/OFF according to the oil pressure switch sig- nal received via CAN communication.
WARNING LAMPS/INDICATOR LAMPS : Component Parts LocationINFOID:0000000003776619
WARNING LAMPS/INDICATOR LAMPS : Component DescriptionINFOID:0000000003776620
INFORMATION DISPLAY
1. IPDM E/R E122, E124 2. Combination meter M23, M24 3. Fuel level sensor unit and fuel pump
C5 (view with inspection hole cover re-
moved)
4. ECM E16 (view with battery removed) 5. ABS actuator and electric unit (control unit) E1256. Oil pressure switch F4
A: Oil pan (upper)
7. A/T assembly F9 8. BCM M18, M19 (view with instrument
lower panel LH removed)
AWNIA0201ZZ
Unit Description
Combination meter Turns the oil pressure warning lamp ON/OFF according to the oil pressure switch signal received
from BCM by means of communication.
IPDM E/R Reads the ON/OFF signals from the oil pressure switch and transmits the oil pressure switch signal
to the combination meter via BCM with the CAN communication line.
Oil pressure switch Refer to MWI-35, "
Description".
BCM Transmits the oil pressure switch signal received from IPDM E/R via CAN communication to the
combination meter via CAN communication.
Revision: December 20092009 QX56

MWI-20
< FUNCTION DIAGNOSIS >
METER SYSTEM
INFORMATION DISPLAY : System Diagram
INFOID:0000000003776621
INFORMATION DISPLAY : System DescriptionINFOID:0000000003776622
FUNCTION
The information display can indicate the following items.
• Intelligent Key operation information
• Maintenance information
• Warning/Indication messages (Door/liftgate/liftgate glass open, low fuel, low washer fluid, parking brake, A/T
oil temp)
DOOR OPEN WARNING
This warning appears when the ignition switch is ON and the front door LH, front door RH, rear door LH, rear
door RH, back door or glass hatch is opened. The BCM receives a door switch signal from the front door
switch LH, front door switch RH, rear door switch LH, rear door switch RH, back door latch and glass hatch
ajar switch. The BCM sends the door switch signal to the combination meter via CAN communication lines.
Then, when the ignition switch is turned ON, the warning message is displayed.
LOW FUEL WARNING
This warning appears when the fuel level in the fuel tank is less than approximately 11.4 (3 US gal, 2.5 Imp
gal). A variable resistor signal is supplied to the combination meter from the fuel level sensor unit to determine
the amount of fuel in the fuel tank.
LOW WINDSHIELD WASHER FLUID WARNING
This warning appears when the windshield washer fluid level is low. When the windshield washer fluid level is
low, the washer level switch provides a ground signal to the combination meter (unified meter control unit).
Once fluid is added, the message will stay on for 30 seconds and then turn off.
PARKING BRAKE INDICATOR
When the parking brake is applied, the parking brake switch provides a ground signal to the combination
meter (unified meter control unit). Then, when the igni tion switch is turned ON and vehicle speed is greater
than 7 km/h (4 MPH), the message is displayed.
Refer to Owner’s Manual for additional information display items.
AWNIA0202GB
Revision: December 20092009 QX56

MWI
METER SYSTEMMWI-21
< FUNCTION DIAGNOSIS >
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INFORMATION DISPLAY : Co mponent Parts LocationINFOID:0000000003776623
INFORMATION DISPLAY : Component DescriptionINFOID:0000000003776624
1. IPDM E/R E122, E124 2. Combination meter M23, M24 3. Fuel level sensor unit and fuel pump
C5 (view with inspection hole cover re-
moved)
4. ECM E16 (view with battery removed) 5. ABS actuator and electric unit (control unit) E1256. Oil pressure switch F4
A: Oil pan (upper)
7. A/T assembly F9 8. BCM M18, M19 (view with instrument
lower panel LH removed)
AWNIA0201ZZ
Unit Description
Combination meter Controls the information display according to the signal received from each unit.
Fuel level sensor unit Refer to MWI-33, "
Description".
BCM Transmits signals provided by various units to the combination meter via CAN communication line.
Washer level switch Transmits the washer level signal to the combination meter.
Parking brake switch Refer to MWI-36, "
Description".
Door switch Transmits the door switch signals to BCM.
Back door latch (door ajar switch) Transmits the back door switch signal to BCM.
Glass hatch ajar switch Transmits the glass hatch ajar switch signal to BCM.
TCM Transmits A/T oil temperature signal to the combination meter with CAN communication line.
Revision: December 20092009 QX56