2007 INFINITI QX56 ignition

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< SERVICE INFORMATION >
STARTING SYSTEM
• Starter relay [within the intelligent power distribution module engine room (IPDM E/R)]
• Harness for open or short
2.CHECK VOLTAGE DROP ON MAGNETIC SWITCH CIRCUIT
1. Turn the ignition switch OFF.
2. Connect starter motor connector F28.
3. Check voltage between starter motor connector F28 terminal 1
and battery positive terminal using a digital circuit tester.
OK or NG
OK >> Magnetic switch circuit is OK. Further inspection is nec-
essary. Refer to "WORK FLOW" .
NG >> Check harness between the battery and the magnetic
switch for poor continuity.
MINIMUM SPECIFICATION OF CRANKING VOLTAGE REFERENCING COOLANT TEMPERA-
TURE
Removal and InstallationINFOID:0000000003533322
REMOVAL
1. Remove the intake manifold. Refer to EM-17, "Removal and Installation".
2. Remove/disconnect the starter harness connectors.
3. Remove the two starter bolts, using power tools.
4. Remove the starter.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
Tighten terminal nut carefully.Ignition switch in
START.: Less than 1V
WKIA1792E
Engine coolant temperature Voltage V
−30°C to −20°C (−22°F to −4°F) 8.4
−19°C to −10°C (−2°F to 14°F) 8.9
−9°C to 0°C (16°F to 32°F) 9.3
More than 1°C (More than 34°F) 9.7
WKIA1388E
Terminal nut : 10.8 N·m (1.1 kg-m, 8 ft-lb)

CHARGING SYSTEM
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< SERVICE INFORMATION >
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CHARGING SYSTEM
System DescriptionINFOID:0000000003533323
The generator provides DC voltage to operate the vehicle's electrical system and to keep the battery charged.
The voltage output is controlled by the IC regulator.
Power is supplied at all times to generator terminal 3 through
• 10A fuse (No. 30, located in the fuse and fusible link box).
Terminal 1 supplies power to charge the battery and operate the vehicle's electrical system. Output voltage is
controlled by the IC regulator at terminal 3 detecting the input voltage. A pulse width modulated (PWM) signal
is sent from terminal 37 of the IPDM E/R to terminal 4 of the generator. The ECM determines the duty cycle of
the power generation variable voltage control system. The charging circuit is protected by the 140A fusible link
[letter a, located in the fusible link box (battery)].
The generator is grounded through the engine.
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 for the charge warning lamp.
Ground is supplied to terminal 13 of the combination meter through terminal 2 of the generator. With power
and ground supplied, the charge warning lamp will illuminate. When the generator is providing sufficient volt-
age with the engine running, the ground is opened and the charge warning lamp will go off. If the charge warn-
ing lamp illuminates with the engine running, a fault is indicated. The IC regulator warning function activates to
illuminate “CHARGE” warning lamp, if any of the following symptoms occur while generator is operating:
• Excessive voltage is produced.
• No voltage is produced.
POWER GENERATION VARIABLE VOLTAGE CONTROL SYSTEM
NOTE:
Power generation variable voltage control system has been adopted. By varying the voltage to the generator,
engine load due to power generation of the generator is reduced and fuel consumption is decreased.
Operation
• The battery current sensor detects the charging/discharging current of the battery. ECM judges the battery
condition based on this signal.
• ECM judges whether to control voltage according to the battery condition.
• ECM calculates the target power generation voltage according to the battery condition and sends the calcu-
lated value, through CAN lines, as the power generation command value to IPDM E/R.
• IPDM E/R converts the received power generation command value into the power generation command sig-
nal (PWM signal) and sends it to the IC regulator.
• The IC regulator performs final control over the power generation voltage.
• When there is no power generation command signal, the generator performs the normal power generation
according to the characteristic of the IC regulator.
NOTE:
When any malfunction is detected in the power generation variable voltage control system, power generation
is performed according to the characteristic of the IC regulator in the generator.
PKIB4908E

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< SERVICE INFORMATION >
CHARGING SYSTEM
Before starting, perform the preliminary inspection. Refer to "PRELIMINARY INSPECTION".
1. Stop the operation of the power generation variable voltage control system using either of the following
procedures.
• Using the CONSULT-II, select "ENGINE" from "SELECT SYSTEM" and set the "ALT DUTY" to 0%.
Keep "ALT DUTY" at 0% until the end of the inspection. When the "ALT DUTY" value is 0% or 100%,
normal power generation is performed according to the characteristic of the IC regulator in the genera-
tor.
• Turn the ignition switch off, and disconnect the battery current sensor connector. Disconnecting the bat-
tery current sensor may cause DTC (P1550 - P1554) to set. After finishing the inspection, connect the
battery current sensor connector and erase the self-diagnostic results history of the engine using CON-
SULT-II.
2. Turn off all loads on the vehicle electrical system.
3. Perform battery and starting system test with Battery/Starting/
Charging system tester.
4. Press “ENTER” to begin the charging system test.
5. Start engine.
6. Press “ENTER” until “LOADS OFF REV ENGINE 5 SEC” is dis-
played.
7. Raise and hold the engine speed at 1,500 to 2,000 rpm for about
5 seconds, then return the engine to idle.
Once the increase in engine rpm is detected, press “ENTER” to
continue.
NOTE:
• If after 30 seconds an increase in engine idle speed is not
detected, “RPM NOT DETECTED” will display.
• Some engines may have a higher idle initially after starting,
particularly when the engine is cold. The tester may detect this
without any other action being taken. If this occurs, continue
on with the testing process. The final results will not be affected.
8. The tester now checks the engine at idle and performs the
DIODE/RIPPLE check.
9. When complete, the tester will prompt you to turn on the follow-
ing electrical loads.
• Heater fan set to highest speed. Do not run the A/C or wind-
shield defroster.
• Headlamp high beam
• Rear window defogger
NOTE:
Do not run the windshield wipers or any other cyclical loads.
SEL417X
SEL418X
SEL419X

CHARGING SYSTEM
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< SERVICE INFORMATION >
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NG >> Repair battery terminal connections.
2.CHECK FUSE AND FUSIBLE LINK
Check for blown fuses and fusible link.
OK or NG
OK >> GO TO 3.
NG >> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse.
3.CHECK GENERATOR DRIVE BELT TENSION
Check generator drive belt tension. Refer to EM-13, "
Checking Drive Belts".
OK or NG
OK >> Inspection End.
NG >> Repair as needed.
DIAGNOSTIC PROCEDURE 1
Check Charge Warning Lamp Circuit
1.CHECK CHARGE WARNING LAMP CIRCUIT CONNECTION
1. Turn the ignition switch OFF.
2. Check terminal 2 harness connector.
OK or NG
OK >> GO TO 2.
NG >> Repair terminal 2 connection. Confirm repair by performing complete Battery/Starting/Charging
system test. Refer to "Trouble Diagnoses with Battery/Starting/Charging System Tester" .
2.CHECK CHARGE WARNING LAMP CIRCUIT
1. Disconnect E205 connector from generator.
2. Apply ground to connector E205 terminal 2 with the ignition
switch in the ON position.
OK or NG
OK >> GO TO "WORK FLOW" .
NG >> Check the following.
• Charge warning lamp (Combination meter)
• Harness for open or short between combination meter
and fuse
• Harness for open between combination meter and
generator
DIAGNOSTIC PROCEDURE 2
Check Battery Circuit
1.CHECK BATTERY CIRCUIT CONNECTION
1. Turn the ignition switch OFF.
2. Check to see if terminal 1 is clean and tight.
OK or NG
OK >> GO TO 2.
NG >> Repair terminal 1 connection. Confirm repair by performing complete Battery/Starting/Charging
system test. Refer to "Trouble Diagnoses with Battery/Starting/Charging System Tester" .
2.CHECK BATTERY CIRCUIT
Unit Power source (Power supply terminals) Fuse or fusible link
GeneratorBattery (“1” terminal) a
Battery (“3” terminal) 30
Combination meter Ignition switch ON (“2” terminal) 14
CHARGE lamp should light up.
WKIA3184E

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< SERVICE INFORMATION >
CHARGING SYSTEM
Check voltage between generator connector E204 terminal 1 and
ground using a digital circuit tester.
OK or NG
OK >> GO TO 3.
NG >> Check harness for open between generator and fusible
link.
3.CHECK VOLTAGE DROP ON BATTERY CIRCUIT
1. Start engine.
2. While engine is running at idle and warm, check voltage
between generator connector E204 terminal 1 and battery posi-
tive terminal using a digital circuit tester.
OK or NG
OK >> GO TO "WORK FLOW" .
NG >> Check harness between the battery and the generator
for poor continuity.
DIAGNOSTIC PROCEDURE 3
Check Voltage Regulator Circuit
1.CHECK VOLTAGE REGULATOR CIRCUIT CONNECTION
1. Turn the ignition switch OFF.
2. Check terminal 3 harness connector.
OK or NG
OK >> GO TO 2.
NG >> Repair terminal 3 connection. Confirm repair by performing complete Battery/Starting/Charging
system test. Refer to "Trouble Diagnoses with Battery/Starting/Charging System Tester" .
2.CHECK VOLTAGE REGULATOR CIRCUIT
Check voltage between generator connector E205 terminal 3 and
ground using a digital circuit tester.
OK or NG
OK >> GO TO "WORK FLOW".
NG >> Check harness for open between generator and fuse.
Removal and InstallationINFOID:0000000003533326
REMOVAL
1. Disconnect the negative battery terminal.
2. Remove the fan shroud. Refer to CO-13, "
Removal and Installation".
3. Remove the drive belt. Refer to EM-13, "
Removal and Installation". Battery voltage should exist.
WKIA2111E
With engine running
at idle and warm.: Less than 0.2V
WKIA3185E
Battery voltage should exist.
WKIA3186E

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< SERVICE INFORMATION >
AUTOMATIC DRIVE POSITIONER
NOTE:
• Disconnecting the battery erases the stored memory.
• After connecting the battery, insert the key into the ignition cylinder and turn the front door switch LH ON (open)→OFF (close)→ON
(open), the entry/exiting function becomes possible.
• After Exiting operation is carried out, return operation can be operated.
NOTE:
During automatic operation, if the ignition switch is turned ON→START, the automatic operation is suspended. When the ignition switch
returns to ON, it resumes.
FA I L - S A F E M O D E
When any manual and automatic operations are not performed, if any motor operations of seats or pedals are
detected for T2 or more, status is judged “Output error”.
CANCEL OF FAIL-SAFE MODE
The mode is cancelled when the A/T selector lever is shifted to P position from any other position.
NOTE:
The front seat LH position and pedal adjustment functions (see the following table) operate simultaneously in
the order of priority.
*: In conjunction with sliding the seat, the door mirrors are positioned.Function Description
Memory operation The front seat LH, steering wheel, pedals (accelerator, brake) and door mirrors move
to the stored driving position by pushing seat memory switch (1 or 2).
Entry/exit-
ing functionExiting operation At exit, the seat moves backward and the steering wheel raises. (Exiting position)
Entry operationAt entry, the seat and steering wheel return from exiting position to the previous driving
position before the exiting operation.
Keyfob interlock operationPerform memory operation, turnout operation and return operation by pressing keyfob
unlock button.
Auto operation temporary stop
conditions.When ignition switch is turned to START during seat memory switch operation and return
operation, seat memory switch operation and return operation is stopped.
Auto operation stop conditions.• When the vehicle speed becomes 7 km/h (4 MPH) or higher (memory switch operation
and entry operation).
• When the setting switch, seat memory switch 1, or 2 are pressed.
• When A/T selector lever is in any position other than P.
• When the door mirror remote control switch is operated (when ignition switch turned to
ON).
• When power seat switch turned ON.
• When pedal adjusting switch turned ON.
• When front seat sliding entry/exiting setting is OFF (entry/exiting operation).
OPERATED PORTION T2
Seat sliding Approx. 0.1 sec.
Seat reclining Same as above
Seat lifting (Front) Same as above
Seat lifting (Rear) Same as above
Steering wheel Same as above
Pedal adjust Same as above
Priority Function Priority Function
1 Seat sliding, (door mirror LH/RH)* 4 Seat reclining
2 Pedal 5 Seat lifter-FR
3 Steering wheel 6 Seat lifter-RR

AUTOMATIC DRIVE POSITIONER
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< SERVICE INFORMATION >
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Driver Seat Control Unit Harness Connector Terminal LayoutINFOID:0000000003533162
Terminal and Reference Value for Driver Seat Control UnitINFOID:0000000003533163
LIIA2449E
Te r m i n a lWire
ColorItem ConditionVoltage (V)
(Approx.)
1 L UART LINE (RX)Pedal adjusting switch ON (FOR-
WARD or BACKWARD operation)
3 L CAN-H — —
6 O Ignition switch (START) Ignition switch (START position) Battery voltage
9 L/R Reclining motor sensor signalON (seat reclining motor opera-
tion)
Other than above 0 or 5
10 W Rear lifting motor sensor signalON (rear lifting motor operation)
Other than above 0 or 5
11 R / BSliding switch BACKWARD sig-
nalON (seat sliding switch BACK-
WARD operation)0
Other than above Battery voltage
12 O/BReclining switch BACKWARD
signalON (seat reclining switch BACK-
WARD operation)0
Other than above Battery voltage
PIIA4813E
SIIA0692J
SIIA0693J

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< SERVICE INFORMATION >
AUTOMATIC DRIVE POSITIONER
13 L/B Front lifting switch DOWN signalON (front lifting switch DOWN op-
eration)0
Other than above Battery voltage
14 G/W Rear lifting switch DOWN signalON (rear lifting switch DOWN op-
eration)0
Other than above Battery voltage
15 L/YPedal adjusting switch BACK-
WARD signalON (pedal adjusting switch BACK-
WARD operation) 0
Other than above Battery voltage
16 W Seat sensor power Ignition switch ON 5
17 W UART LINE (TX)Pedal adjusting switch ON (FOR-
WARD or BACKWARD operation)
19 P CAN-L — —
21 L/RA/T device (park position switch)
signalA/T selector lever in P position 0
A/T selector lever in other than P
position with ignition key in ignition
cylinderBattery voltage
24 Y/G Seat sliding motor sensor signalON (seat sliding motor operation)
Other than above 0 or 5
25 LG Front lifting motor sensor signalON (front lifting motor operation)
Other than above. 0 or 5
26 P/BSeat sliding switch FORWARD
signalON (seat sliding switch FOR-
WARD operation)0
Other than above Battery voltage
27 G/BSeat reclining switch FORWARD
signalON (seat reclining switch FOR-
WARD operation)0
Other than above Battery voltage
28 Y/B Front lifting switch UP signalON (front lifting switch UP opera-
tion)0
Other than above Battery voltage Te r m i n a lWire
ColorItem ConditionVoltage (V)
(Approx.)
PIIA4814E
PIIA3277E
SIIA0691J