battery INFINITI QX56 2007 Factory Service Manual

BRC-34
< SERVICE INFORMATION >[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Wheel Sensor System InspectionINFOID:0000000003532784
INSPECTION PROCEDURE
1.CONNECTOR INSPECTION
Disconnect the ABS actuator and electric unit (control unit) connector E125 and wheel sensor of malfunction-
ing code.
Check the terminals for deformation, disconnection, looseness or damage.
OK or NG
OK >> GO TO 2.
NG >> Repair or replace as necessary.
2.CHECK WHEEL SENSOR OUTPUT SIGNAL
1. Connect ABS active wheel sensor tester (J-45741) to wheel sensor using appropriate adapter.
2. Turn on the ABS active wheel sensor tester power switch.
NOTE:
The green POWER indicator should illuminate. If the POWER indicator does not illuminate, replace the
battery in the ABS active wheel sensor tester before proceeding.
3. Spin the wheel of the vehicle by hand and observe the red SENSOR indicator on the ABS active wheel
sensor tester. The red SENSOR indicator should flash on and off to indicate an output signal.
NOTE:
If the red SENSOR indicator illuminates but does not flash, reverse the polarity of the tester leads and
retest.
Does the ABS active wheel sensor tester detect a signal?
YES >> GO TO 3.
NO >> Replace the wheel sensor. Refer to BRC-56, "
Removal and Installation".
3.CHECK TIRES
Check for inflation pressure, wear and size of each tire.
Are tire pressure and size correct and is tire wear within specifications?
YES >> GO TO 4.
NO >> Adjust tire pressure or replace tire(s).
4.CHECK WHEEL BEARINGS
Check wheel bearing axial end play. Refer to FAX-5, "
On-Vehicle Inspection and Service" (front) or RAX-5,
"On-Vehicle Inspection and Service" (rear).
OK or NG
OK >> GO TO 5.
NG >> Repair or replace as necessary. Refer to FAX-5, "
On-Vehicle Inspection and Service" (front) or
RAX-5, "
On-Vehicle Inspection and Service" (rear).
5.CHECK WIRING HARNESS FOR SHORT CIRCUIT
1. Disconnect ABS actuator and electric unit (control unit) connec-
tor and wheel sensor connector of malfunction code No.
2. Check continuity between wheel sensor harness connector ter-
minals and ground.
OK or NG
OK >> GO TO 6.
NG >> Repair the circuit.
6.CHECK WIRING HARNESS FOR OPEN CIRCUITContinuity should not exist.
WFIA0343E

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
BRC-41
< SERVICE INFORMATION >[VDC/TCS/ABS]
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Check the voltage between the ABS actuator and electric unit (con-
trol unit) harness connector E125 terminal 41 and body ground.
OK or NG
OK >> Perform self-diagnosis again. If the same results
appear, replace ABS actuator and electric unit (control
unit). Refer to BRC-58, "
Removal and Installation".
NG >> GO TO 4.
4.STOP LAMP RELAY CIRCUIT INSPECTION
1. Disconnect the stop lamp relay harness connector E12.
2. Check the continuity between the ABS actuator and electric unit
(control unit) harness connector E125 (B) terminal 41 and stop
lamp relay harness connector E12 (A) terminal 4.
OK or NG
OK >> Perform self-diagnosis again. If the same results
appear, replace ABS actuator and electric unit (control
unit). Refer to BRC-58, "
Removal and Installation"BRC-
58, "Removal and Installation".
NG >> Refer to "Stop Lamp Switch System Inspection".
ABS/TCS/VDC Control Unit Power and Ground Systems InspectionINFOID:0000000003532792
INSPECTION PROCEDURE
1.SELF-DIAGNOSIS RESULT CHECK
Check self-diagnosis results.
Is the above displayed in the self-diagnosis display items?
YES >> GO TO 2.
NO >> Inspection End.
2.CONNECTOR INSPECTION
1. Disconnect the ABS actuator and electric unit (control unit) connector E125.
2. Check the terminals for deformation, disconnection, looseness or damage.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace as necessary.
3.ABS/TCS/VDC CONTROL UNIT POWER AND GROUND CIRCUIT INSPECTION
Measure the voltage and continuity between the ABS actuator and electric unit (control unit) harness connec-
tor E125 and body ground.Brake pedal depressed : Battery voltage
(approx. 12V)
Brake pedal not depressed : Approx. 0V
WFIA0198E
Continuity should exist
WFIA0431E
Self-diagnosis results
BATTERY VOLTAGE
Signal nameABS actuator and electric unit
(control unit) connector E125Body
groundMeasured value
Power supply1
— Battery voltage (Approx. 12V)
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BRC-42
< SERVICE INFORMATION >[VDC/TCS/ABS]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
OK or NG
OK >> Check the battery for loose terminals, low voltage, etc. Repair as necessary.
NG >> Repair the circuit.
Brake Fluid Level Switch System InspectionINFOID:0000000003532793
INSPECTION PROCEDURE
1.SELF-DIAGNOSIS RESULT CHECK
1. Check the brake reservoir tank fluid level. If the level is low, add brake fluid.
2. Erase the self-diagnosis results and check the self-diagnosis results.
Is the above displayed in the self-diagnosis display items?
YES >> GO TO 2.
NO >> Inspection End.
2.CONNECTOR INSPECTION
1. Disconnect the ABS actuator and electric unit (control unit) connector E125 and brake fluid level switch
connector E21.
2. Check the terminals for deformation, disconnection, looseness or damage.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace as necessary.
3.CHECK THE HARNESS BETWEEN THE BRAKE FLUID LEVEL SWITCH AND THE ABS ACTUATOR AND
ELECTRIC UNIT (CONTROL UNIT)
Check the continuity between the brake fluid level switch harness connector E21 and the ABS actuator and
electric unit (control unit) harness connector E125.
OK or NG
OK >> GO TO 4.
NG >> Repair the circuit.
4.CHECK BRAKE FLUID LEVEL SWITCH
Check continuity between brake fluid level switch terminals 1 and 2.
OK or NG
OK >> Perform self-diagnosis again. If the same results appear, replace ABS actuator and electric unit
(control unit). Refer to BRC-58, "
Removal and Installation".
NG >> Replace brake fluid level switch.Ground16
— Continuity should exist.
47
Self-diagnosis results
BR FLUID LEVEL LOW
ABS actuator and electric unit
(control unit) harness connector
E125Brake fluid level switch harness
connector E21Continuity
81Yes
8GroundNo
Ground 2 Yes
Continuity should not exist.

BRC-58
< SERVICE INFORMATION >[VDC/TCS/ABS]
ACTUATOR AND ELECTRIC UNIT (ASSEMBLY)
ACTUATOR AND ELECTRIC UNIT (ASSEMBLY)
Removal and InstallationINFOID:0000000003532813
REMOVAL
1. Disconnect the negative battery terminal.
2. Remove the cowl top extension. Refer to EI-17, "
Removal and Installation" .
3. Drain the brake fluid. Refer to BR-8, "
Drain and Refill".
4. Disconnect the actuator harness from the ABS actuator and electric unit (control unit).
CAUTION:
• To remove the brake tubes, use a flare nut wrench to prevent the flare nuts and brake tubes from
being damaged.
• Be careful not to splash brake fluid on painted areas; it may cause paint damage. If brake fluid is
splashed on painted areas, wash it away with water immediately.
5. Disconnect the brake tubes.
6. Remove the three bolts and remove the ABS actuator and electric unit (control unit).
INSTALLATION
Installation is in the reverse order of removal.
NOTE:
To install, use a flare nut wrench (commercial service tool). Tighten brake tubes to specification when install-
ing. Refer to BR-10, "
Hydraulic Circuit" .
1. To left front 2. To rear right 3. To rear left
4. To front right 5. From the master cylinder secondary
side6. From the master cylinder primary
side
7. ABS actuator and electric unit (con-
trol unit)8. Harness connector
WFIA0375E

COMBINATION METERSDI-5
< SERVICE INFORMATION >
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COMBINATION METERS
Component Parts and Har ness Connector LocationINFOID:0000000003533479
System DescriptionINFOID:0000000003533480
UNIFIED METER CONTROL UNIT
• Speedometer, odometer, tachometer, fuel gauge, oil pressure gauge, voltage gauge, A/T oil temperature
gauge, and water temperature gauge are controlled by the unified meter control unit, which is built into the
combination meter.
• Warning indicators are controlled by signals drawn fr om the CAN communication system, BCM (body control
module), and components connected directly to the combination meter.
• Digital meter is adopted for odometer/trip meters*, as well as the A/T position indicator display. *The record of the odometer is kept ev en if the battery cable is disconnected.
• Odometer/trip meters and A/T indicator segments can be checked in diagnosis mode.
• Meters/gauges can be checked in diagnosis mode.
Illumination control
The unified meter control unit outputs the speedometer, odometer/trip meters, tachometer, oil pressure gauge,
voltage meter, A/T indicator, A/T temperature gauge, fuel and temperature gauge lighting when the ignition
switch is turned on. When the lighting switch is turned on, the illumination control switch can be used to adjust
the brightness of the combination meter illuminati on and the odometer/trip meters and meter illumination.
When the ignition switch is turned from the OFF to the ON position, the combination meter dial lighting will
remain off for 0.7 seconds. For additional combination meter illumination control information, refer to LT-120,
"System Description".
1. IPDM E/R E122 2. Combination meter M24 3. Fuel level sensor unit and fuel pump
C5 (view with inspection hole cover
removed)
4. ECM E16 (view with battery re- moved) 5. ABS actuator and electric unit (con-
trol unit) E125 6. Oil pressure switch F4
A. Oil pan (upper)
7. A/T assembly F9
WKIA5718E

DI-6
< SERVICE INFORMATION >
COMBINATION METERS
POWER SUPPLY AND GROUND CIRCUIT
Power is supplied at all times
• through 10A fuse [No.19, located in the fuse block (J/B)]
• to combination meter terminal 8.
With the ignition switch in the ON or START position, power is supplied
• through 10A fuse [No.14, located in the fuse block (J/B)]
• to combination meter terminal 24.
Ground is supplied
• to combination meter terminal 17
• through body grounds M57, M61 and M79.
WATER TEMPERATURE GAUGE
The water temperature gauge indicates the engine coolant temperature.
ECM provides an engine coolant temperature signal to combination meter via CAN communication lines.
ENGINE OIL PRESSURE GAUGE
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 (intelligent power distribution module engine room). Low
oil pressure causes oil pressure switch terminal 1 to provide ground to IPDM E/R terminal 42. The IPDM E/R
then signals the combination meter (unified meter control unit) via CAN communication lines and a low oil
pressure indication is displayed by the oil pressure gauge.
A/T OIL TEMPERATURE GAUGE
The A/T oil temperature gauge indicates the A/T fluid temperature.
TCM (transmission control module) provides an A/T flui d temperature signal to combination meter via CAN
communication lines.
VOLTAGE GAUGE
The voltage gauge indicates the battery/charging system voltage.
The voltage gauge is regulated by the unified meter control unit.
TA C H O M E T E R
The tachometer indicates engine speed in revolutions per minute (rpm).
ECM provides an engine speed signal to combination meter via CAN communication lines.
FUEL GAUGE
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
• to combination meter terminal 15.
• through fuel level sensor unit and fuel pump terminal 2
• through fuel level sensor unit and fuel pump terminal 5
• from combination meter terminal 16
SPEEDOMETER
ABS actuator and electric unit (contro l unit) provides a vehicle speed signal to the combination meter via CAN
communication lines.
ODO/TRIP METER
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
Refer to Owner's Manual for odo/tr ip meter operating instructions.
CAN COMMUNICATION SYSTEM DESCRIPTION
Refer to LAN-4.

COMBINATION METERSDI-11
< SERVICE INFORMATION >
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Combination Meter Harness Connector Terminal LayoutINFOID:0000000003533484
Terminal and Reference Va lue for Combination MeterINFOID:0000000003533485
LKIA0698E
Te r m i n a l
No. Wire
color Item Condition
Reference value (V)
(Approx.)
Ignition
switch Operation or condition
1 O Ignition switch ACC or ON ON — Battery voltage
8 Y/R Battery power supply OFF — Battery voltage
9 R/G Stop lamp switch ON Brake pedal depressed Battery voltage
Brake pedal released 0
10 P/B Brake fluid level switch ON Brake fluid level low 0
Brake fluid level normal Battery voltage
11 L C A N - H — — —
12 P CAN-L — — —
14 P/L Seat belt buckle switch
RH ONUnfastened (ON) 0
Fastened (OFF) Battery voltage
15 Y/L Fuel level sensor signal — — Refer to
DI-18, "
Fuel Level Sensor
Unit Inspection".
16 B/P Fuel level sensor and oil
pressure sensor ground ON — 0V
17 B Ground — — 0V
18 BR Illumination control switch — Lighting switch ON Refer to
LT- 1 2 0 , "
System Descrip-
tion".
23 G Parking Brake switch ON Parking brake applied 0
Parking brake released Battery voltage
24 O/L Ignition switch ON or
START ON — Battery voltage
27 O/B Seat belt buckle pre-ten-
sioner assembly LH (seat
belt buckle switch) ON
Unfastened (ON) 0
Fastened (OFF) Battery voltage
28 G/O Security indicator input OFF Security indicator ON 0
Security indicator
OFF Battery voltage
29 W/R Vehicle speed signal
(8-pulse) ONSpeedometer operated
[When vehicle speed is ap-
prox. 40 km/h (25 MPH)]
PKIA1935E

DI-12
< SERVICE INFORMATION >
COMBINATION METERS
Self-Diagnosis Mode of Combination Meter
INFOID:0000000003533486
SELF-DIAGNOSIS FUNCTION
The following items can be checked during Combination Meter Self-Diagnosis Mode.
• Gauge sweep and present gauge values.
• Illuminates all odometer, fuel, and engine temperature segments.
• Illuminates all micro controlled lamps/LE D's regardless of switch configuration.
• Displays estimated present battery voltage.
• Displays seat belt buckle switch LH status.
HOW TO INITIATE COMBINATION METER SELF- DIAGNOSIS MODE
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.
To initiate Combination Meter Self-Diagnosis Mode, refer to the following procedure.
1. Turn the ignition switch ON, while holding the odom eter/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 ci rcuit when self-diagnosis mode of combination
meter does not start. Refer to DI-16, "
Power Supply and Ground Circuit Inspection". Replace combination
meter if normal. Refer to IP-10, "
Removal and Installation".
COMBINATION METER SELF-DIAGNOSIS MODE FUNCTIONS
To interpret Combination Meter Self-Diagnosis Mode functions, refer to the following table.
37 W/L Washer fluid level switch ON Washer fluid level low 0
Washer fluid level normal Battery voltage
Te r m i n a l
No. Wire
color Item Condition
Reference value (V)
(Approx.)
Ignition
switch Operation or condition
Event Odometer 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
Odometer/trip meter A/B
switch engaged and re-
leased = next test re-
quested rXXXX, FAILReturn to normal opera-
tion of all lamps/LEDs and
displays hex ROM rev. If a
ROM checksum fault ex-
ists, display alternates be-
tween "r XXXX" and
"FAIL".
Next test requested nrXXXX Displays hex ROM rev as
stored in NVM.
Next test requested Sc1XX Displays 8-bit software
configuration value in Hex
format.Bit Coding
7-3 = reserved for future use
2 = TCS/VDC 0 = not present
1 = present
1 = Shift type 0 = Column shift
1 = Floor shift
0 = ICC 0 = not present
1 = present
Next test requested Sc2XX Displays 8-bit software
configuration value in Hex
format.Bit coding
7-0 = Reserved for future use

DI-14
< SERVICE INFORMATION >
COMBINATION METERS
Next test requested ot0XXDisplays oil pressure tell-
tale "off" threshold in A/D
counts in Hex format.$00 - $FF
Next test requested XXXXX Raw uncompensated en-
glish speed value in hun-
dredths of MPH.
Speedometer indicates
present speed.Will display "-----"
if message is
not received. Will display
"99999" if data received is in-
valid
Next test requested XXXXX Raw uncompensated
metric speed value in hun-
dredths of KPH. Speed-
ometer indicates present
speed.Will display "-----"
if message is
not received. Will display
"99999" if data received is in-
valid
Next test requested tXXXX Tachometer value in
RPM. Tachometer indi-
cates present RPM.Will display "-----"
if message is
not received.
Next test requested F1 XXXX Present ratioed fuel level
A/D input 1 in decimal for-
mat. Fuel gauge indicates
present filtered level.000-009 = Short circuit
010-254 = Normal range
255 = Open circuit
--- = Missing 5 seconds
Next test requested F2 XXX Present FLPS. 010-254 normal range
Next test requested FS X Fuel filter rate 0 = Normal
1 = Fast
Next test requested XXXC Last temperature gauge
input value in degrees C.
Temperature gauge indi-
cates present filtered tem-
perature.Will display "---"
C if message is
not received.
Will display "999" if data re-
ceived is invalid.
Next test requested BAtXX.X Estimated present battery
voltage.
Next test requested rES -X Seat belt buckle switch LH
status.0 = Unbuckled
1 = Buckled
Next test requested PA -XX Hex value port A.
Next test requested Pb -XX Hex value port B.
Next test requested PE -XX Hex value port E.
Next test requested PL -XX Hex value port L.
Next test requested P6 -XX Hex value port K.
Next test requested Pn -XX Hex value port M.
Next test requested PP -XX Hex value port P.
Next test requested PS -XX Hex value port S.
Next test requested Pt -XX Hex value port T.
Next test requested Pu -XX Hex value port U.
Next test requested P4 -XX Hex value port V.
Next test requested Puu -XX Hex value port W.
Next test requested A00XXX A/D port A/D value (non-
ratioed).0-255
Next test requested A01XXX A/D port A/D value (non-
ratioed).
0-255
Next test requested A02XXX A/D port A/D value (non-
ratioed).0-255
Next test requested A03XXX A/D port A/D value (non-
ratioed).0-255
Event Odometer Display Description of Test/Data Notes:

COMBINATION METERSDI-17
< SERVICE INFORMATION >
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Refer to DI-9, "Wiring Diagram - METER -".
OK or NG
OK >> GO TO 2.
NG >> If fuse is blown, be sure to eliminate caus e of malfunction before installing new fuse. Refer to PG-
3.
2.CHECK POWER SUPPLY CIRCUIT
1. Disconnect combination meter connector.
2. Check voltage between combination meter harness connector terminals and ground.
OK or NG
OK >> GO TO 3.
NG >> Check the harness for open between combination meter and fuse.
3.CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between combination meter harness connector terminal and ground.
OK or NG
OK >> Inspection End.
NG >> Repair harness or connector.
Vehicle Speed Signal InspectionINFOID:0000000003533491
1.CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) SELF-DIAGNOSIS
Refer to BRC-26, "
CONSULT-II Function (ABS)".
OK or NG
OK >> Replace the combination meter. Refer to IP-10, "Removal and Installation".
NG >> Perform "Diagnostic Procedure" for displayed DTC. Refer to BRC-26, "
CONSULT-II Function
(ABS)".
Engine Oil Pressure Signal InspectionINFOID:0000000003533492
1.CHECK SELF-DIAGNOSTIC RESULTS OF IPDM E/R
Select "IPDM E/R" on CONSULT-II, and perform self-diagnosis of IPDM E/R. Refer to PG-18, "
CONSULT-II
Function (IPDM E/R)".
Unit Power source Fuse No.
Combination meter Battery 19
Ignition switch ON or START 14
Terminals Ignition switch position
(+) (–) OFF ACC ON
Connector Terminal
M24 8
Ground Battery
voltage Battery
voltage Battery
voltage
24 0V 0V Battery
voltage
WKIA5606E
Te r m i n a l s
Continuity
(+)
(–)
Connector Terminal
M24 17 Ground Yes
WKIA1526E