2006 INFINITI QX56 wheel

AT-36
A/T CONTROL SYSTEM
Revision: November 20092006 QX56
Engine Brake ControlECS00CE2

The forward one-way clutch transmits the drive force from the engine to the rear wheels. But the reverse
drive from the rear wheels is not transmitted to the engine because the one-way clutch is idling.
Therefore, the low coast brake solenoid is operated to prevent the forward one-way clutch from idling and
the engine brake is operated in the same manner as conventionally.

The operation of the low coast brake solenoid switches the low coast brake switching valve and controls
the coupling and releasing of the low coast brake.
The low coast brake reducing valve controls the low coast brake coupling force.
Control ValveECS00CE3
FUNCTION OF CONTROL VALVE
SCIA1520E
NameFunction
Torque converter regulator valve In order to prevent the pressure supplied to the torque converter from being excessive,
the line pressure is adjusted to the optimum pressure (torque converter operating pres-
sure).
Pressure regulator valve
Pressure regulator plug
Pressure regulator sleeve Adjusts the oil discharged from the oil pump to the optimum pressure (line pressure) for
the driving state.
Front brake control valve When the front brake is coupled, adjusts the line pressure to the optimum pressure
(front brake pressure) and supplies it to the front brake. (In 1st, 2nd, 3rd, and 5th gears,
adjusts the clutch pressure.)
Accumulator control valve Adjusts the pressure (accumulator control pressure) acting on the accumulator piston
and low coast reducing valve to the pressure appropriate to the driving state.
Pilot valve A Adjusts the line pressure and produces the constant pressure (pilot pressure) required
for line pressure control, shift change control, and lock-up control.
Pilot valve B Adjusts the line pressure and produces the constant pressure (pilot pressure) required
for shift change control.
Low coast brake switching valve During engine braking, supplies the line pressure to the low coast brake reducing valve.
Low coast brake reducing valve When the low coast brake is coupled, adjusts the line pressure to the optimum pressure
(low coast brake pressure) and supplies it to the low coast brake.
N-R accumulator Produces the stabilizing pressure for when N-R is selected.
Direct clutch piston switching valve Operates in 4th gear and switches the direct clutch coupling capacity.
High and low reverse clutch control valve When the high and low reverse clutch is coupled, adjusts the line pressure to the opti-
mum pressure (high and low reverse clutch pressure) and supplies it to the high and low
reverse clutch. (In 1st, 3rd, 4th and 5th gears, adjusts the clutch pressure.)

AT-42
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
TROUBLE DIAGNOSISPFP:00004
DTC Inspection Priority ChartECS00CE9
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
NOTE:
If DTC U1000 is displayed with other DTCs, first perform the trouble diagnosis for DTC U1000. Refer to
AT- 9 6
.
Fail-SafeECS00CEA
The TCM has an electrical fail-safe mode. This mode makes it possible to operate even if there is an error in a
main electronic control input/output signal circuit. In fail-safe mode the transmission is fixed in 2nd, 4th or 5th
(depending on the breakdown position), so the customer should feel “slipping” or “poor acceleration ”.
Even when the electronic circuits are normal, under special conditions (for example, when slamming on the
brake with the wheels spinning drastically and stopping the tire rotation), the transmission can go into fail-safe
mode. If this happens, switch “OFF ” the ignition switch for 10 seconds, then switch it “ON” again to return to
the normal shift pattern. Therefore, the customer's vehicle has returned to normal, so handle according to the
“diagnostics flow ” (Refer to AT- 4 5 , "
WORK FLOW" ).
FAIL-SAFE FUNCTION
If any malfunction occurs in a sensor or solenoid, this function controls the A/T to make driving possible.
Vehicle Speed Sensor

Signals are input from two systems - from vehicle speed sensor A/T (revolution sensor) installed on the
transmission and from combination meter so normal driving is possible even if there is a malfunction in
one of the systems. And if vehicle speed sensor A/T (revolution sensor) has unusual cases, 5th gear is
prohibited.
Accelerator Pedal Position Sensor

If there is a malfunction in one of the systems, the accelerator opening angle is controlled by ECM accord-
ing to a pre-determined accelerator angle to make driving possible. And if there are malfunctions in tow
systems, the engine speed is fixed by ECM to a pre-determined engine speed to make driving possible.
Throttle Position Sensor

If there is a malfunction in one of the systems, the accelerator opening angle is controlled by ECM accord-
ing to a pre-determined accelerator angle to make driving possible. And if there are malfunctions in tow
systems, the accelerator opening angle is controlled by the idle signal sent from the ECM which is based
on input indicating either idle condition or off-idle condition (pre-determined accelerator opening) in order
to make driving possible.
PNP Switch

In the unlikely event that a malfunction signal enters the TCM, the position indicator is switched “OFF”, the
starter relay is switched “OFF ” (starter starting is disabled), the back-up lamp relay switched “OFF” (back-
up lamp is OFF) and the position is fixed to the “D” range to make driving possible.
Starter Relay

The starter relay is switched “OFF”. (Starter starting is disabled.)
Priority Detected items (DTC)
1 U1000 CAN communication line
2 Except above

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Removal and Installation for CompressorEJS003YT
A/C Compressor Mounting
REMOVAL
1. Discharge the refrigerant. Refer to ATC-171, "HFC-134a (R-134a) Service Procedure" .
2. Remove the front right wheel and tire assembly. Refer to WT-7, "
Rotation" .
3. Remove the engine under cover and the splash shield using power tool.
4. Remove the engine air cleaner and air ducts. Refer to EM-15, "
AIR CLEANER AND AIR DUCT" .
5. Remove the drive belt. Refer to EM-13, "
DRIVE BELTS" .
6. Disconnect the compressor electrical connector.
7. Disconnect the high-pressure flexible hose and low-pressure flexible hose from the compressor. CAUTION:
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.
8. Remove the compressor bolts and nut using power tools.
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BREAK-IN OPERATION
When replacing compressor clutch assembly, always conduct the break-in operation. This is done by engag-
ing and disengaging the clutch about 30 times. Break-in operation raises the level of transmitted torque.
Removal and Installation for Low-pressure Flexible HoseEJS003YV
REMOVAL
1. Remove the engine room cover using power tools.
2. Remove the engine air cleaner and air ducts. Refer to EM-15, "
AIR CLEANER AND AIR DUCT"
3. Remove the cowl top extension. Refer to EI-18, "COWL TOP" .
4. Discharge the refrigerant. Refer to ATC-171, "
HFC-134a (R-134a) Service Procedure" .
CAUTION:
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.
5. Remove the low-pressure flexible hose.
INSTALLATION
Installation is in the reverse order of removal.
Refer to ATC-173, "
Components" .
CAUTION:

Replace the O-ring of the low-pressure flexible hose with a new one, then apply compressor oil to
it when installing it.

After charging refrigerant, check for leaks.
Removal and Installation for High-pressure Flexible HoseEJS003YW
REMOVAL
1. Remove the engine under cover.
2. Remove the engine air cleaner and air ducts. Refer to EM-15, "
AIR CLEANER AND AIR DUCT" .
3. Discharge the refrigerant. Refer to ATC-171, "
HFC-134a (R-134a) Service Procedure" .
4. Remove the high-pressure flexible hose. CAUTION:
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.
INSTALLATION
Installation is in the reverse order of removal.
Refer to ATC-173, "
Components" .
CAUTION:

Replace the O-ring of the high-pressure flexible hose with a new one, then apply compressor oil to
it when installing it.

After charging refrigerant, check for leaks.
Removal and Installation for High-pressure PipeEJS003YX
REMOVAL
1. Remove the cowl top extension. Refer to EI-18, "COWL TOP" .
2. Disconnect the battery negative terminal and positive battery terminal.
3. Reposition the IPDM E/R aside.
4. Remove the front right wheel and tire assembly. Refer to WT-7, "
Rotation" .
5. Position aside the front floor insulator.
6. Discharge the refrigerant. Refer to ATC-171, "
HFC-134a (R-134a) Service Procedure" .
7. Remove the low pressure pipe. Refer to ATC-180, "
Removal and Installation for Low-pressure Pipe" .
8. Remove the high-pressure pipe. CAUTION:
Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.
INSTALLATION
Installation is in the reverse order of removal.
Refer to ATC-173, "
Components" .

ATC-182
REFRIGERANT LINES
Revision: November 20092006 QX56
5. Remove the front and rear bumper fascia. Refer to EI-13, "FRONT BUMPER" (front), EI-15, "REAR
BUMPER" (rear).
6. Reposition the front fender protector out of the way. Refer to EI-23, "
FENDER PROTECTOR" .
7. Disconnect the chassis harness connector.
8. Remove the spare wheel and tire.
9. Remove the tailpipe and tailpipe hanger bracket. Refer to EX-3, "
Removal and Installation" .
10. Remove the seatbelt latch anchor. Refer to RSU-26, "
Components" .
11. Remove the front floor heat shield.
12. Disconnect each end of the underfloor rear high- and low-pressure A/C and heater core pipes. Refer to ATC-173, "
Components" .
CAUTION:
Cap or wrap the joint of the pipes with suitable material such as vinyl tape to avoid the entry of air.
13. Set two suitable jacks at the RH body mount points to support the vehicle body when it is separated from the RH side of the frame.
14. Remove the RH body mount bolts. Refer to BL-159, "
Body Mounting" .
15. Use the vehicle hoist to lower the RH side of the frame from the RH side of the body [approximately 305 mm (12 in)] until there is sufficient clearance to remove the underfloor rear high- and low-pressure A/C
and heater core pipes from between the body and the frame.
16. Remove the underfloor rear high- and low-pressure A/C and heater core pipes from the back of the vehi- cle.
INSTALLATION
Installation is in the reverse order of removal.
Refer to ATC-173, "
Components" .
CAUTION:

Replace the O-ring of the high/low-pressure pipe with a new one, then apply compressor oil to it
when installing it.

After charging refrigerant, check for leaks.
Removal and Installation for Refrigerant Pressure SensorEJS003YZ
REMOVAL
1. Discharge the refrigerant. Refer to ATC-171, "HFC-134a (R-134a) Service Procedure" .
2. Disconnect the refrigerant pressure sensor electrical connector and remove the refrigerant pressure sensor from the condenser.
CAUTION:
Be careful not to damage the condenser fins.
INSTALLATION
Installation is in the reverse order of removal.
Refer to ATC-173, "
Components" .
CAUTION:

Be careful not to damage the condenser fins.

Replace the O-ring of the refrigerant pressure sensor with a new one, then apply compressor oil to
it when installing it.

After charging refrigerant, check for leaks.
Removal and Installation for CondenserEJS003Z0
REMOVAL
1. Discharge the refrigerant. Refer to ATC-171, "HFC-134a (R-134a) Service Procedure" .
LJIA0145E

AV-1
AUDIO, VISUAL, NAVIGATION & TELEPHONE SYS-TEM
K ELECTRICAL
CONTENTS
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Revision: November 2009 2006 QX56
PRECAUTIONS .....................................................
..... 4
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” ............................................................. ..... 4
PREPARATION ...................................................... ..... 5
Commercial Service Tool .................................... ..... 5
AUDIO .................................................................... ..... 6
Component Parts and Harness Connector Location ..... 6
System Description ............................................. ..... 8
REAR AUDIO REMOTE CONTROL UNIT ...... ..... 8
SATELLITE RADIO TUNER (PRE-WIRING) ... ..... 9
SATELLITE RADIO TUNER (FACTORY
INSTALLED) .................................................... ..... 9
SPEED SENSITIVE VOLUME SYSTEM ......... ..... 9
Schematic ........................................................... ... 10
Wiring Diagram — AUDIO — .............................. .... 11
Terminals and Reference Value for Audio Unit .... ... 22
Terminals and Reference Value for BOSE Speaker
Amp. .................................................................... ... 25
Terminals and Reference Value for Rear Audio
Remote Control Unit ............................................ ... 28
Terminals and Reference Value for AV Switch .... ... 29
Terminals and Reference Value for Satellite Radio
Tuner (Factory Installed) ..................................... ... 30
AV Switch Self-Diagnosis Function ..................... ... 31
STARTING THE SELF-DIAGNOSIS MODE .... ... 31
EXITING THE SELF-DIAGNOSIS MODE ........ ... 31
DIAGNOSIS FUNCTION .................................. ... 31
Trouble Diagnosis ............................................... ... 32
MALFUNCTION WITH RADIO AND CD .......... ... 32
FOR RADIO ONLY ........................................... ... 32
FOR CD ONLY ................................................. ... 33
FOR SATELLITE RADIO TUNER (FACTORY
INSTALLED) ONLY .......................................... ... 33
Noise Inspection .................................................. ... 33
TYPE OF NOISE AND POSSIBLE CAUSE ..... ... 33
Power Supply Circuit Inspection ......................... ... 35
Satellite Radio Tuner (Factory Installed) Power and
Ground Supply Circuit Inspection ........................ ... 37
Satellite Radio Tuner (Factory Installed) Commu- nication Circuit Inspection ....................................
... 38
Satellite Radio Tuner (Factory Installed) Left Chan-
nel Audio Signal Circuit Inspection ...................... ... 40
Satellite Radio Tuner (Factory Installed) Right
Channel Audio Signal Circuit Inspection ............. ... 41
Steering Switch Check ......................................... ... 41
AV Switch Check ................................................. ... 43
Audio Communication Line Check ...................... ... 44
Sound Is Not Heard From Front Door Speaker or
Front Tweeter ...................................................... ... 44
Sound Is Not Heard From Rear Door Speaker or
Rear Door Tweeter ................................................. 48
Sound Is Not Heard From Center Speaker ......... ... 51
Sound Is Not Heard From Subwoofer .................... 52
Removal and Installation ..................................... ... 55
AUDIO UNIT ..................................................... ... 55
AV SWITCH ...................................................... ... 55
BOSE SPEAKER AMP. .................................... ... 55
CENTER SPEAKER ......................................... ... 56
FRONT DOOR SPEAKER ............................... ... 56
FRONT TWEETER .......................................... ... 56
REAR AUDIO REMOTE CONTROL UNIT ....... ... 57
REAR DOOR SPEAKER .................................. ... 57
REAR DOOR TWEETER ................................. ... 57
SATELLITE RADIO ANTENNA ........................ ... 58
SATELLITE RADIO TUNER ............................. ... 58
STEERING WHEEL AUDIO CONTROL
SWITCHES ...................................................... ... 59
SUBWOOFER .................................................. ... 59
AUDIO ANTENNA ................................................. ... 60
System Description .............................................. ... 60
Wiring Diagram — W/ANT — .............................. ... 61
Location of Antenna ............................................. ... 62
Window Antenna Repair ...................................... ... 62
ELEMENT CHECK ........................................... ... 62
ELEMENT REPAIR .......................................... ... 63
TELEPHONE .......................................................... ... 64
Component Parts and Harness Connector Location ... 64
System Description .............................................. ... 65
BLUETOOTH® HANDS-FREE PHONE SYS-

AV-3
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*** ” is Shown) .....................................................
. 153
Distance to Empty Displayed is Not Shown (“ *** ”
is Shown) ............................................................ . 154
Driving Distance or Average Speed Displayed is Not
Shown (“ *** ” is Shown) ...................................... . 154
WARNING DOOR OPEN Screen is Not Shown . . 154
Unable to Operate All of AV Switches (Unable to
Start Self-Diagnosis) ........................................... . 155
Audio Does Not Work .......................................... . 155
Navigation System Does Not Activate ................ . 155
Previous NAVI Conditions are Not Stored ........... . 156
Previous Vehicle Conditions are Not Stored ....... . 156
Position of Current Location Mark is Not Correct . 156
Radio Wave From GPS Satellite is Not Received . 156
Driving Test ......................................................... . 157
Example of Symptoms Judged Not Malfunction . . 158
BASIC OPERATION ........................................ . 158
VEHICLE MARK .............................................. . 158
DESTINATION, PASSING POINTS, AND MENU
ITEMS CANNOT BE SELECTED/SET ............ . 159
VOICE GUIDE .................................................. . 159
ROUTE SEARCH ............................................. . 160
EXAMPLES OF CURRENT-LOCATION MARK
DISPLACEMENT ............................................. . 161
CURRENT-LOCATION MARK SHOWS A POSI-
TION WHICH IS COMPLETELY WRONG ....... . 164CURRENT-LOCATION MARK JUMPS ............
.164
CURRENT-LOCATION MARK IS IN A RIVER OR
SEA .................................................................. .165
WHEN DRIVING ON SAME ROAD, SOME-
TIMES CURRENT-LOCATION MARK IS IN
RIGHT PLACE AND SOMETIMES IT IS WRONG
PLACE .............................................................. .165
LOCATION CORRECTION BY MAP-MATCH-
ING IS SLOW ................................................... .165
ALTHOUGH GPS RECEIVING DISPLAY IS
GREEN, VEHICLE MARK DOES NOT RETURN
TO CORRECT LOCATION ............................... .165
NAME OF CURRENT PLACE IS NOT DIS-
PLAYED ............................................................ .165
CONTENTS OF DISPLAY DIFFER FOR BIRD-
VIEW™ AND THE (FLAT) MAP SCREEN ....... .165
Program Loading of NAVI Control Unit ................ .166
Removal and Installation ..................................... .167
AV SWITCH ...................................................... .167
DISPLAY CONTROL UNIT ............................... .167
DISPLAY UNIT ................................................. .167
GPS ANTENNA ................................................ .167
NAVI CONTROL UNIT ..................................... .168
STEERING WHEEL AUDIO CONTROL
SWITCHES ...................................................... .168

AUDIOAV-7
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Revision: November 2009 2006 QX56
1. Fuse block (J/B)2. Fuse and fusible link box 3. Front tweeter LH
M109
4. Combination meter M24 5. Center speaker
M110 6. Display unit
M93
7. Display control unit M94, M95 8. Front tweeter RH
M 111 9. AV Switch
M98
10. Audio unit M43, M44, M45, M46 11. BOSE speaker amp
M112, M113 12. Satellite radio tuner (pre-wiring or factory
installed, if equipped)
M41
13. Steering wheel audio control switches 14. Front door speaker LH, RH D12, D11215. Rear door tweeter LH, RH
D208, D308
16. Rear door speaker LH, RH D207, D307 17. Driver seat
18. Subwoofer
B72
19. Rear audio remote control unit R204