2005 INFINITI QX4 wheel

ACS-42
[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Revision: October 20052005 QX56
tem running test. Refer to ACS-9, "ICC System Running Test" . Then perform self-diagnosis of
ICC system again.
NG >> GO TO 2.
2. CHECK ICC STEERING SWITCH
Check ICC steering switch. Refer to ACS-59, "
ICC Steering Switch" .
OK or NG
OK >> GO TO 3.
NG >> Replace ICC steering switch assembly. Refer to AV- 1 5 7 , "
Removal and Installation of Steering
Wheel Switch" . Erase DTC and perform ICC system running test. Refer to ACS-9, "ICC System
Running Test" . Then perform self-diagnosis of ICC system again.
3. CHECK ICC STEERING SWITCH SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM and spiral cable connectors.
3. Check continuity between ECM harness connectors E16 and
F54 terminals 67 (B), 99 (G/Y) and spiral cable harness connec-
tor M30 terminals 33 (B), 34 (G/Y).
OK or NG
OK >> GO TO 4.
NG >>

Repair harness between ECM and spiral cable.

Erase DTC and perform ICC system running test. Refer to ACS-9, "ICC System Running Test"
. Then perform self-diagnosis of ICC system again.
4. CHECK ICC STEERING SWITCH SIGNAL CIRCUIT
1. Disconnect remaining spiral cable connector.
2. Check continuity between spiral cable (to vehicle) terminals 33,
34 and spiral cable (to switch) terminals 14,15.
OK or NG
OK >> Replace ECM. Erase DTC and perform ICC system run-
ning test. Refer to ACS-9, "
ICC System Running Test" .
Then perform self-diagnosis of ICC system again.
NG >>

Replace spiral cable. Refer to SRS-48, "Removal and
Installation" .

Erase DTC and perform ICC system running test.
Refer to ACS-9, "
ICC System Running Test" . Then
perform self-diagnosis of ICC system again. 67 - 33, 99 - 34 Continuity should exist.
WKIA1928E
34 - 14, 33 - 15 Continuity should exist.
WKIA3617E

ACS-60
[ICC]
REMOVAL AND INSTALLATION
Revision: October 20052005 QX56
REMOVAL AND INSTALLATIONPFP:00000
ICC UnitEKS00BMV
ICC SensorEKS00BMW
CAUTION:
Perform the laser beam aiming procedure every time the ICC sensor is removed or installed.
ICC Steering SwitchEKS00BMX
Replace ICC steering switch as switch kit assembly. Refer to AV- 4 7 , "Removal and Installation of Steering
Wheel Audio Control Switches" .
WKIA1914E
LKIA0631E

A/T CONTROL SYSTEM
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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
Name Function
Torque converter regulator valveIn 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 sleeveAdjusts the oil discharged from the oil pump to the optimum pressure (line pressure) for
the driving state.
Front brake control valveWhen 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 valveAdjusts 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 AAdjusts the line pressure and produces the constant pressure (pilot pressure) required
for line pressure control, shift change control, and lock-up control.
Pilot valve BAdjusts 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 valveWhen 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 valveWhen 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.)

TROUBLE DIAGNOSIS
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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 5
.
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-44, "
WORK FLOW" ).
FAI L-S AFE FUN CT ION
If any malfunction occurs in a sensor or solenoid, this function controls the A/T to mark 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

REFRIGERANT LINES
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Revision: October 20052005 QX56
Removal and Installation for CompressorEJS003YT
A/C Compressor Mounting
REMOVAL
1. Discharge the refrigerant. Refer to ATC-175, "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-14, "
AIR CLEANER AND AIR DUCT" .
5. Remove the drive belt. Refer to EM-12, "
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.
WJIA0958E

REFRIGERANT LINES
ATC-183
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Revision: October 20052005 QX56
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-14, "
AIR CLEANER AND AIR DUCT"
3. Remove the cowl top extension. Refer to EI-18, "COWL TOP" .
4. Discharge the refrigerant. Refer to ATC-175, "
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-177, "
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-14, "
AIR CLEANER AND AIR DUCT" .
3. Discharge the refrigerant. Refer to ATC-175, "
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-177, "
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 cable.
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-175, "
HFC-134a (R-134a) Service Procedure" .
7. Remove the low pressure pipe. Refer to ATC-184, "
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-177, "
Components" .

AV-1
AUDIO, VISUAL, NAVIGATION & TELEPHONE SYS-
TEM
K ELECTRICAL
CONTENTS
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SECTION AV
A
B
AV
Revision: October 20052005 QX56 PRECAUTIONS .......................................................... 4
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 4
Wiring Diagrams and Trouble Diagnosis .................. 4
PREPARATION ........................................................... 5
Commercial Service Tool ......................................... 5
AUDIO ......................................................................... 6
Component Parts and Harness Connector Location ..... 6
System Description .................................................. 7
REAR AUDIO REMOTE CONTROL UNIT ........... 7
SATELLITE RADIO TUNER (PRE-WIRING) ........ 8
SPEED SENSITIVE VOLUME SYSTEM .............. 8
Schematic ................................................................ 9
Wiring Diagram — AUDIO — ................................. 10
Terminals and Reference Value for Audio Unit ....... 19
Terminals and Reference Value for BOSE Speaker
Amp. ....................................................................... 22
Terminals and Reference Value for Rear Audio
Remote Control Unit ............................................... 24
Terminals and Reference Value for AV Switch ....... 25
AV Switch Self-Diagnosis Function ........................ 27
STARTING THE SELF-DIAGNOSIS MODE ....... 27
EXITING THE SELF-DIAGNOSIS MODE ........... 27
DIAGNOSIS FUNCTION ..................................... 27
Trouble Diagnosis .................................................. 28
MALFUNCTION WITH RADIO AND CD ............. 28
FOR RADIO ONLY .............................................. 28
FOR CD ONLY .................................................... 29
Noise Inspection ..................................................... 29
TYPE OF NOISE AND POSSIBLE CAUSE ........ 29
Power Supply Circuit Inspection ............................ 30
Steering Switch Check ........................................... 32
AV Switch Check .................................................... 33
Audio Communication Line Check ......................... 33
Sound Is Not Heard From Front Door Speaker or
Front Tweeter ......................................................... 34
Sound Is Not Heard From Rear Door Speaker or
Rear Door Tweeter ................................................. 38
Sound Is Not Heard From Center Speaker ............ 41Sound Is Not Heard From Subwoofer .................... 42
Removal and Installation for Audio Unit ................. 45
Removal and Installation for AV Switch .................. 45
Removal and Installation of Front Door Speaker .... 45
Removal and Installation of Rear Door Speaker .... 45
Removal and Installation of Front Tweeter ............. 46
Removal and Installation of Rear Door Tweeter ..... 46
Removal and Installation of Center Speaker .......... 46
Removal and Installation of Subwoofer .................. 46
Removal and Installation of BOSE Speaker Amp. ... 46
Removal and Installation of Rear Audio Remote
Control Unit ............................................................. 47
Removal and Installation of Steering Wheel Audio
Control Switches ..................................................... 47
AUDIO ANTENNA .................................................... 48
System Description ................................................. 48
Wiring Diagram — W/ANT — ................................. 49
Location of Antenna ................................................ 50
Window Antenna Repair ......................................... 50
ELEMENT CHECK .............................................. 50
ELEMENT REPAIR ............................................. 51
DVD ENTERTAINMENT SYSTEM ............................ 52
Component Parts and Harness Connector Location ... 52
System Description ................................................. 53
Schematic ............................................................... 54
Wiring Diagram — DVD — ..................................... 55
Trouble Diagnosis ................................................... 58
Power Supply Circuit Inspection ............................. 59
Removal and Installation of DVD Player ................ 60
Removal and Installation of Video Monitor ............. 60
NAVIGATION SYSTEM ............................................. 61
System Description ................................................. 61
TRAVEL DISTANCE ............................................ 61
TRAVEL DIRECTION .......................................... 61
MAP-MATCHING ................................................. 61
GPS (GLOBAL POSITIONING SYSTEM) .......... 62
COMPONENT DESCRIPTION ............................ 63
BIRDVIEW™ ....................................................... 63
MAP DISPLAY ..................................................... 64
FUNCTION OF CENTER SWITCH ..................... 65

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AV
Revision: October 20052005 QX56 Previous NAVI Conditions are Not Stored ............ 146
Previous Vehicle Conditions are Not Stored ........ 146
Position of Current Location Mark is Not Correct . 146
Radio Wave From GPS Satellite is Not Received . 146
Driving Test .......................................................... 147
Example of Symptoms Judged Not Malfunction .. 148
BASIC OPERATION ......................................... 148
VEHICLE MARK ............................................... 148
DESTINATION, PASSING POINTS, AND MENU
ITEMS CANNOT BE SELECTED/SET ............. 149
VOICE GUIDE ................................................... 149
ROUTE SEARCH .............................................. 150
EXAMPLES OF CURRENT-LOCATION MARK
DISPLACEMENT .............................................. 151
CURRENT LOCATION MARK SHOWS A POSI-
TION WHICH IS COMPLETELY WRONG ........ 154
CURRENT-LOCATION MARK JUMPS ............. 154
CURRENT LOCATION MARK IS IN A RIVER OR
SEA ................................................................... 155
WHEN DRIVING ON SAME ROAD, SOME-TIMES CURRENT-LOCATION MARK IS IN
RIGHT PLACE AND SOMETIMES IT IS WRONG
PLACE ...............................................................155
LOCATION CORRECTION BY MAP-MATCH-
ING IS SLOW ....................................................155
ALTHOUGH GPS RECEIVING DISPLAY IS
GREEN, VEHICLE MARK DOES NOT RETURN
TO CORRECT LOCATION ................................155
NAME OF CURRENT PLACE IS NOT DIS-
PLAYED .............................................................155
CONTENTS OF DISPLAY DIFFER FOR BIRD-
VIEW™ AND THE (FLAT) MAP SCREEN ........155
Program Loading of NAVI Control Unit .................156
Removal and Installation of NAVI Control Unit .....157
Removal and Installation of GPS Antenna ...........157
Removal and Installation of Steering Wheel Switch .157
Removal and Installation of AV Switch .................158
Removal and Installation of Display Unit ..............158
Removal and Installation of Display Control Unit . 158