ignition INFINITI QX56 2010 Factory Service Manual

MWI-20
< FUNCTION DIAGNOSIS >
METER SYSTEM
INFORMATION DISPLAY : System Diagram
INFOID:0000000005146066
INFORMATION DISPLAY : System DescriptionINFOID:0000000005146067
FUNCTION
The information display can indicate the following items.
• Intelligent Key operation 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: April 20092010 QX56

MWI-22
< FUNCTION DIAGNOSIS >
DIAGNOSIS SYSTEM (METER)
DIAGNOSIS SYSTEM (METER)
Diagnosis DescriptionINFOID:0000000005146071
SELF-DIAGNOSIS MODE
The following items can be checked during Combination Meter Self-Diagnosis Mode.
• Gauge sweep and present gauge values.
• Illuminates all odometer/trip meters and A/T indicator segments.
• Illuminates all micro controlled lamps/LEDs regardless of switch position.
• Displays estimated present battery voltage.
• Displays seat belt buckle switch LH status.
OPERATION PROCEDURE
NOTE:
• Once entered, combination meter self-diagnosis mode will function with the ignition switch in ON or START.
Combination meter self-diagnosis mode will exit upon turning the ignition switch to OFF or ACC.
• If the diagnosis function is activated with trip A displa yed, the mileage on trip A is reset to 0000.0. (Trip B
operates the same way.)
To initiate combination meter self-diagnosis mode, refer to the following procedure.
1. Turn the ignition switch ON, while pressing the odometer/trip meter switch for 5 - 8 \
seconds. When the diagnosis function is activated, the odometer/trip meter will display tESt.
NOTE:
Check combination meter power supply and ground circuit when self-diagnosis mode of combination meter
does not start. Refer to MWI-28, "
COMBINATION METER : Diagnosis Procedure". Replace combination
meter if normal. Refer to MWI-100, "
Removal and Installation".
COMBINATION METER SELF-DIAGNOSIS MODE FUNCTIONS
To interpret combination meter self-diagnosis mode functions, refer to the following table.
EventOdometer Display Description of Test/Data Notes:
Odometer/trip meter A/B
switch held from 5 to 8
seconds (or until re-
leased) tESt
Initiating self-diagnosis mode
Switch released GAGE Performs sweep of all
gauges, then displays
present gauge values.Gauges sweep within 10 seconds
Switch pressed (All segments illuminated) Lights all LCD segments.
Compare with picture.
Switch pressed bulbIlluminates all micro-con-
trolled lamps/LEDs. Part may not be configured for all
lamps (functions) th
at turn on dur-
ing test. This is normal.
Switch pressed r XXXX, FAIL Return to normal opera-
tion of all lamps/LEDs and
displays “r XXXX”.If a malfunction exists, “FAIL” will
flash.
Switch pressed nrXXXX Displays Hex ROM rev as
stored in NVM.
Switch pressed EE XX, FAIL Displays “EE XX”.If a malfunction exists, “FAIL” will
flash.
Switch pressed dtXXXX Hex coding of final manu-
facturing test date.
AWNIA0203ZZ
Revision: April 20092010 QX56

MWI-28
< COMPONENT DIAGNOSIS >
POWER SUPPLY AND GROUND CIRCUIT
POWER SUPPLY AND GROUND CIRCUIT
COMBINATION METER
COMBINATION METER : Diagnosis ProcedureINFOID:0000000005146078
Regarding Wiring Diagram information, refer to MWI-41, "Wiring Diagram".
1.CHECK FUSES
Check for blown combination meter fuses.
Is the inspection result normal?
YES >> GO TO 2
NO >> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse.
2.POWER SUPPLY CIRCUIT CHECK
1. Disconnect combination meter connector M24.
2. Check voltage between combination meter harness connector M24 terminals 21, 37, 40 and ground.
Is the inspection result normal?
YES >> GO TO 3
NO >> Check harness for open between combination meter and fuse.
3.GROUND CIRCUIT CHECK
1. Turn ignition switch OFF.
2. Disconnect combination meter connector M23.
3. Check continuity between combination meter harness connector M23 terminal 47, 52 and ground, and connector M24 terminal 20
and ground.
Is the inspection result normal?
Unit Power source Fuse No.
Combination meter Battery 3
Ignition switch ON or START 14
Ignition switch ACC or ON 4
TerminalsIgnition switch position
(+) (–) OFF ACC ON START
Connector Terminal
M24 21
Ground 0V 0V
Battery
voltage Battery
voltage
37 0VBattery
voltage Battery
voltage 0V
40 Battery
voltage Battery
voltage Battery
voltage Battery
voltage
AWNIA0204ZZ
Te r m i n a l s
Continuity
(+)
(–)
Connector Terminal
A: M23 47
Ground Yes
52
B: M24 20
AWNIA0205ZZ
Revision: April 20092010 QX56

MWI
POWER SUPPLY AND GROUND CIRCUITMWI-29
< COMPONENT DIAGNOSIS >
C
DE
F
G H
I
J
K L
M B A
O P
YES >> Inspection End.
NO >> Check ground harness.
BCM (BODY CONTROL MODULE)
BCM (BODY CONTROL MODULE) : Diagnosis ProcedureINFOID:0000000005380655
Regarding Wiring Diagram information, refer to MWI-70, "Wiring Diagram".
1. CHECK FUSES AND FUSIBLE LINK
Check that the following fuses and fusible link are not blown.
Is the fuse blown?
YES >> Replace the blown fuse or fusible link after repairing the affected circuit.
NO >> GO TO 2
2. CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM.
3. Check voltage between BCM harness connector and ground.
Is the measurement value normal?
YES >> GO TO 3
NO >> Repair or replace harness.
3. CHECK GROUND CIRCUIT
Terminal No. Signal nameFuses and fusible link No.
57 Battery power supply 22 (15A)
70 F (50A)
11 Ignition ACC or ON 4 (10A)
38 Ignition ON or START 59 (10A)
ConnectorTe r m i n a l s
Power
source Condition Voltage (V) (Ap-
prox.)
(+) (-)
M18 11 Ground
ACC
power
supply Ignition
switch
ACC or ON Battery voltage
38 Ground Ignition
power
supply Ignition
switch ON
or START Battery voltage
M20 57 Ground
Battery
power
supply Ignition
switch OFF Battery voltage
70 Ground Battery
power
supply Ignition
switch OFF Battery voltage
LIIA2415E
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MWI-30
< COMPONENT DIAGNOSIS >
POWER SUPPLY AND GROUND CIRCUIT
Check continuity between BCM harness connector and ground.
Does continuity exist?
YES >> Inspection End.
NO >> Repair or replace harness.
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
IPDM E/R (INTELLIGENT POWER DIST RIBUTION MODULE ENGINE ROOM) : Di-
agnosis Procedure
INFOID:0000000005380656
Regarding Wiring Diagram information, refer to MWI-85, "Wiring Diagram".
1. CHECK FUSES AND FUSIBLE LINK
Check that the following IPDM E/R fuses or fusible link are not blown.
Is the fuse blown?
YES >> Replace the blown fuse or fusible link after repairing the affected circuit.
NO >> GO TO 2
2. CHECK BATTERY POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R.
3. Check voltage between IPDM E/R harness connectors and ground.
Is the measurement value normal?
YES >> GO TO 3
NO >> Repair or replace harness.
3. CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
BCM
GroundContinuity
Connector Terminal
M20 67 Yes
LIIA0915E
Terminal No. Signal nameFuses and fusible link No.
1 Battery A, D
2 Battery C
12 Ignition switch ON or START 59
TerminalsIgnition switch position
(+) (−) OFF ON START
Connector Terminal
E118 (A) 1
Ground Battery
voltage Battery
voltage Battery
voltage
2 Battery
voltage Battery
voltage Battery
voltage
E119 (B) 12 0VBattery
voltage Battery
voltage
AWMIA0023ZZ
Revision: April 20092010 QX56

MWI-32
< COMPONENT DIAGNOSIS >
FUEL LEVEL SENSOR SIGNAL CIRCUIT
FUEL LEVEL SENSOR SIGNAL CIRCUIT
DescriptionINFOID:0000000005146081
The fuel level sensor unit and fuel pump detects the approximate fuel level in the fuel tank and transmits the
fuel level signal to the combination meter.
Component Function CheckINFOID:0000000005146082
1.COMBINATION METER INPUT SIGNAL
1. Select “METER/M&A” on CONSULT-III.
2. Using “FUEL METER” of “DAT A MONITOR”, compare the value of DATA MONITOR with fuel gauge
pointer of combination meter.
Does the data monitor value approximately match the fuel gauge indication?
YES >> Inspection End.
NO >> Replace combination meter. Refer to MWI-100, "
Removal and Installation".
Diagnosis ProcedureINFOID:0000000005146083
Regarding Wiring Diagram information, refer to MWI-41, "Wiring Diagram".
1.CHECK HARNESS CONNECTOR
1. Turn ignition switch OFF.
2. Check combination meter and fuel level sensor uni t terminals (meter-side and harness-side) for poor con-
nection.
Is the inspection result normal?
YES >> GO TO 2
NO >> Repair or replace terminals or connectors.
2.CHECK FUEL LEVEL SENSOR UNIT CIRCUIT
1. Disconnect combination meter connector and fuel level sensor unit connector.
2. Check continuity between combination meter harness connector
(B) and fuel level sensor uni t and fuel pump harness connector
(A).
3. Check continuity between fuel level sensor unit and fuel pump harness connector (A) and ground.
Fuel gauge pointer Reference value of data monitor [lit.]
Full Approx. 93
3/4 Approx. 73
1/2 Approx. 52
1/4 Approx. 30
Empty Approx. 11
AB
Continuity
Connector Terminal Connector Terminal
C5 2 M24 3 Yes
AWNIA0206ZZ
Revision: April 20092010 QX56

MWI-34
< COMPONENT DIAGNOSIS >
OIL PRESSURE SWITCH SIGNAL CIRCUIT
OIL PRESSURE SWITCH SIGNAL CIRCUIT
DescriptionINFOID:0000000005146085
Detects the engine oil pressure and transmits the oil pressure switch signal to the IPDM E/R.
Component Function CheckINFOID:0000000005146086
1.COMBINATION METER INPUT SIGNAL
1. Select “METER/M&A” on CONSULT-III.
2. Monitor “OIL W/L” of “DATA MONITOR” while operating ignition switch.
>> Inspection End.
Diagnosis ProcedureINFOID:0000000005146087
Regarding Wiring Diagram information, refer to MWI-41, "Wiring Diagram".
1.CHECK OIL PRESSURE SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R connector E122 and oil pressure switch
connector F4.
3. Check continuity between IPDM E/R harness connector E122
(A) terminal 42 and oil pressure switch harness connector F4 (B)
terminal 1.
Is the inspection result normal?
YES >> Inspection End.
NO >> Repair harness or connector.
Component InspectionINFOID:0000000005146088
1.CHECK OIL PRESSURE SWITCH
Check continuity between oil pressure switch and ground.
Is the inspection result normal?
YES >> Inspection End.
NO >> Replace the oil pressure switch. OIL W/L
When ignition switch is in ON
position (Engine stopped)
: ON
When engine is running : OFF
Continuity should exist.
WKIA5607E
Condition Oil pressure [kPa (kg/cm2, psi)]Continuity
Engine stopped Less than 29 (0.3, 4) Yes
Engine running More than 29 (0.3, 4) No
ELF0044D
Revision: April 20092010 QX56

MWI-36
< COMPONENT DIAGNOSIS >
WASHER LEVEL SWITCH SIGNAL CIRCUIT
WASHER LEVEL SWITCH SIGNAL CIRCUIT
DescriptionINFOID:0000000005146093
Transmits the washer level switch signal to the combination meter.
Diagnosis ProcedureINFOID:0000000005146094
Regarding Wiring Diagram information, refer to MWI-41, "Wiring Diagram".
1.CHECK WASHER FLUID LEVEL SWITCH SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect combination meter connector and washer fluid level switch connector.
3. Check continuity between combination meter harness connector M24 (A) terminal 23 and washer fluid level switch harness con-
nector E106 (B) terminal 1.
4. Check continuity between combination meter harness connector M24 (A) terminal 23 and ground.
Is the inspection result normal?
YES >> GO TO 2
NO >> Repair harness or connector.
2.CHECK WASHER FLUID LEVEL SWITCH GROUND CIRCUIT
Check continuity between washer fluid level switch harness connec-
tor E106 terminal 2 and ground.
Is the inspection result normal?
YES >> Inspection End.
NO >> Repair harness or connector.
Component InspectionINFOID:0000000005146095
1.CHECK WASHER FLUID LEVEL SWITCH
Check continuity between washer fluid level switch terminals 1 and
2.
Is the inspection result normal?
YES >> Inspection End.
NO >> Replace washer fluid level switch. 23 - 1
: Continuity should exist.
23 - Ground : Continuity should not exist.
AWNIA0209ZZ
2 - Ground: Continuity should exist.
AWNIA0112ZZ
TerminalWasher fluid level Continuity
1 - 2 Low
Yes
Other No
AWNIA0113ZZ
Revision: April 20092010 QX56

MWI
COMBINATION METERMWI-39
< ECU DIAGNOSIS >
C
DE
F
G H
I
J
K L
M B A
O P
ECU DIAGNOSIS
COMBINATION METER
Reference ValueINFOID:0000000005146098
TERMINAL LAYOUT
PHYSICAL VALUES
WKIA5724E
Te r m i - nal Wire
color Item Condition
Reference value (V)
(Approx.)
Ignition
switch Operation or condition
3 Y/L Fuel level sensor signal — —Refer to
MWI-12, "
FUEL GAUGE : System
Description".
4 B/P Fuel level sensor ground ON —0
6 BR/W Generator ONGenerator voltage low
0
Generator voltage normal Battery voltage
10 L CAN-H —— —
11 P C A N - L —— —
13 P Air bag warning lamp in-
put ONAir bag warning lamp ON
4
Air bag warning lamp OFF 0
15 BR CK SUSP warning lamp
input —CK SUSP warning lamp
ON
0
CK SUSP warning lamp
OFF Battery voltage
20 B Ground —— 0
21 O/L Ignition switch ON or
START ON
— Battery voltage
23 W/L Washer fluid level switch ON Washer fluid level low
0
Washer fluid level normal Battery voltage
24 O/B Seat belt buckle switch
LH ONUnfastened (ON)
0
Fastened (OFF) Battery voltage
25 P/L Seat belt buckle switch
RH ONUnfastened (ON)
0
Fastened (OFF) Battery voltage
31 G Parking brake switch ON Parking brake applied
0
Parking brake released Battery voltage
32 P/B Brake fluid level switch ON Brake fluid level low
0
Brake fluid level normal Battery voltage
35 G/O Security indicator input OFF Security indicator ON
0
Security indicator OFF Battery voltage
Revision: April 20092010 QX56

MWI-40
< ECU DIAGNOSIS >
COMBINATION METER
37 OIgnition switch ACC or
ON
—
— Battery voltage
40 P Battery power supply — —Battery voltage
46 BR Illumination output ——Refer to INL-9, "
System Description".
47 B Ground —— 0
50 W/R Vehicle speed signal out-
put (8-pulse) ONSpeedometer operated
[When vehicle speed is ap-
prox. 40 km/h (25 MPH)] NOTE:
Maximum voltage may be 12V due to spec-
ifications (connected units).
52 B Ground —— 0
Te r m i -
nal Wire
color Item Condition
Reference value (V)
(Approx.)
Ignition
switch Operation or condition
PKIC0643E
Revision: April 20092010 QX56