2006 INFINITI QX56 air condition

RF-20
SUNROOF
Revision: November 20092006 QX56
Sunroof Motor Assembly Power Supply and Ground Circuit CheckEIS004W3
1. CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect the sunroof motor assembly connector.
3. Turn ignition switch ON.
4. Check voltage between sunroof motor assembly connector R4 terminals 1, 5 and ground.
OK or NG
OK >> GO TO 2.
NG >> GO TO 3.
2. CHECK GROUND CIRCUIT
Check continuity between sunroof motor assembly connector R4 terminal 7 and ground.
OK or NG
OK >> Sunroof motor assembly power supply and ground cir- cuits are OK. Further inspection is necessary. Refer to
RF-17, "
Trouble Diagnosis Chart by Symptom" .
NG >> Repair or replace harness.
3. CHECK BCM OUTPUT SIGNAL
1. Turn ignition switch ON.
2. Check voltage between BCM connector M20 terminals 68, 69 and ground.
OK or NG
OK >> GO TO 4.
NG >> Replace BCM. Refer to BCS-20, "
BCM" .
Connector Terminals
Condition Voltage
(Approx.)
(+) ( –)
R4 1
Ground Ignition switch ON Battery voltage
Within 45 seconds after
ignition switch is turned
OFF
Battery voltage
When front door LH or
RH is open while retained
power is operating 0
5 Ignition switch OFF Battery voltage
WIIA0250E
7 - Ground : Continuity should exist.
WIIA0251E
68 - Ground: Battery voltage
69 - Ground : Battery voltage
WIIA0425E

SUNROOFRF-21
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Revision: November 2009 2006 QX56
4. CHECK SUNROOF MOTOR CIRCUIT HARNESS
1. Turn ignition switch OFF.
2. Disconnect BCM connector.
3. Check continuity between BCM connector M20 terminal 68, 69 and sunroof motor assembly connector R4 terminals 1, 5.
4. Check continuity between BCM connector M20 terminal 68, 69 and ground.
OK or NG
OK >> Sunroof motor assembly power supply circuits are OK. Further inspection is necessary. Refer to RF-17, "
Trouble Diagnosis Chart by Symptom" .
NG >> Repair or replace harness between BCM and sunroof motor assembly.
Door Switch CheckEIS004W4
1. CHECK DOOR SWITCH INPUT SIGNAL
With CONSULT-II
Check door switches ("DOOR SW-DR" and "DOOR SW-AS") in "DATA MONITOR" mode with CONSULT-II.
Without CONSULT-II
1. Turn ignition switch OFF.
2. Check voltage between BCM connector and ground.
OK or NG
OK >> Door switches are OK.
NG >> GO TO 2. 68 - 1
: Continuity should exist.
69 - 5 : Continuity should exist.
68 - Ground : Continuity should not exist.
69 - Ground : Continuity should not exist.
LIIA1246E
Monitor item Condition
DOOR SW-DR OPEN
: ON
CLOSE : OFF
DOOR SW-AS OPEN
: ON
CLOSE : OFF
PIIA2464E
Item Connector Te r m i n a l s
Condition Voltage
(Approx.)
(+) (– )
RH M18 12 GroundDoor open
(switch closed) 0
Door closed
(switch open) Battery voltage
LH M19 47 Door open
(switch closed) 0
Door closed
(switch open) Battery voltage
WIIA0234E

RF-22
SUNROOF
Revision: November 20092006 QX56
2. CHECK DOOR SWITCH CIRCUIT
1. Disconnect front door switches and BCM connectors.
2. Check continuity between front door switch connector B8 (LH) or B108 (RH) terminal 2 and BCM connec- tor M18, M19 terminals 12 and 47.
3. Check continuity between front door switch connector B8 (LH) or B108 (RH) terminal 2 and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace harness between BCM and sunroof motor assembly.
3. CHECK DOOR SWITCHES
Check continuity between each door switch terminal 2 and body ground part of door switch.
OK or NG
OK >> GO TO 4.
NG >> Replace malfunctioning door switch.
4. CHECK BCM OUTPUT SIGNAL
1. Connect BCM connectors.
2. Check voltage between BCM connector M18 terminal 12, M19 terminal 47 and ground.
OK or NG
OK >> Check the condition of the harness and the connector.
NG >> Replace BCM. Refer to BCS-20, "
BCM" .
Front door switch LH
2 - 47
: Continuity should exist.
Front door switch RH
2 - 12 : Continuity should exist.
2 - Ground : Continuity should not exist.
WIIA0235E
Terminal Condition Continuity
2 Body ground part
of door switch Door switch pushed No
Door switch released Yes
WIIA0289E
12 - Ground
: Battery voltage
47 - Ground : Battery voltage
WIIA0234E

PRECAUTIONSRSU-3
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PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
EES001GX
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER ”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WARNING:

To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer.

Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.

Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.
Precautions for Rear SuspensionEES001GY

When installing the rubber bushings, the final tightening must be done under unladen condition and with
the tires on level ground. Oil will shorten the life of the rubber bushings, so wipe off any spilled oil immedi-
ately.

Unladen condition means the fuel tank, engine coolant and lubricants are at the full specification. The
spare tire, jack, hand tools, and mats are in their designated positions.

After installing suspension components, check the wheel alignment.

Caulking nuts are not reusable. Always use new caulking nuts for installation. New caulking nuts are pre-
oiled, do not apply any additional lubrication.

TROUBLE DIAGNOSISRSU-7
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TROUBLE DIAGNOSISPFP:00000
How to Perform Trouble Diagnoses for Quick and Accurate RepairEES001H3
INTRODUCTION
The rear load leveling air suspension system uses an electronic con-
trol unit to control major functions. The control unit accepts input sig-
nals from the height sensor and controls compressor and exhaust
valve operation.
It is much more difficult to diagnose a rear load leveling air suspen-
sion system problem that occurs intermittently rather than continu-
ously. Most intermittent problems are caused by poor electrical
connections or faulty wiring. In this case, careful checking of suspi-
cious circuits may help prevent the replacement of good parts.
Before undertaking actual checks, take just a few minutes to talk with
a customer who approaches with an air suspension system com-
plaint. The customer is a very good source of information on such
problems, especially intermittent ones. Through discussion with the
customer, find out what symptoms are present and under what con-
ditions they occur.
Start your diagnosis by looking for basic mechanical problems first.
This is one of the best ways to troubleshoot concerns on an air sus-
pension system equipped vehicle. Also check related Service Bulle-
tins for information.
CLARIFY CONCERN

A customer's description of a vehicle concern may vary depend-
ing on the individual. It is important to clarify the customer's con-
cern.

Ask the customer about what symptoms are present under what
conditions. Use this information to reproduce the symptom.
SEF233G
SEF234G
SBR339B

RSU-12
TROUBLE DIAGNOSIS
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Basic InspectionEES001H6
AIR HOSES
1. Check for pinched or damaged air hoses between the suspension air reservoir and each load leveling rear
air suspension shock absorber. Reposition, repair or replace hoses as necessary.
2. Check the air hose connections at the suspension air reservoir and at the shock absorbers for leaks. If connections are leaking, repair or replace hoses as necessary.
POWER SYSTEM TERMINAL LOOSENESS AND BATTERY INSPECTION
Make sure the battery positive cable, negative cable and ground connection are not loose. In addition, make
sure the battery is sufficiently charged.
CK SUSP INDICATOR LAMP INSPECTION
1. Make sure the CK SUSP indicator lamp turns on for approximately 2 seconds when the ignition switch is
turned ON. If it does not, check the combination meter. Refer to DI-5, "
COMBINATION METERS" .
2. Make sure the lamp turns off approximately 2 seconds after the ignition switch is turned ON. If the lamp does not turn off, conduct self-diagnosis of the suspension control unit.
3. After conducting the self-diagnosis, be sure to erase the error memory. Refer to RSU-13, "
CONSULT-II
Function (AIR LEVELIZER)" .
CK SUSP Indicator Lamp TimingEES001H7
X: ON
—: OFF
Control Unit Input/Output Signal StandardEES001H8
ConditionCK SUSP
indicator lamp Remarks
Ignition switch OFF ––
Ignition switch ON X Turns off after approximately 2 seconds.
Te r m i n a l
No. Wire color
Item ConditionVoltage (V)
(Approx.)
1 V Compressor relay output
Ignition switch ON or STARTBattery voltage
3 W Height sensor signal input 0.2V - 4.8V
5 R Reference voltage 5V
6 G/R Ignition power
Battery voltage
7W /LB atte ry p ow er —
8 G/W Diagnostic K-line ——
9 SB Exhaust valve output Ignition switch ON or STARTBattery voltage
10 BR Warning lamp output ——
14 L Height sensor ground ——
15 BR/W Generator L signal input Engine running—
16 B Suspension control unit ground —0V

RSU-14
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
6. Select the required operation from the "SELECT DIAG MODE"
screen.
For further information, see the CONSULT-II Operation Manual.
SELF-DIAGNOSIS
Description
If an error is detected in the system, perform self-diagnosis as follows:
Operation Procedure
1. Turn ignition switch OFF.
2. Connect CONSULT-II and CONSULT-II CONVERTER to the data link connector.
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carries out CAN communication.
3. Turn ignition switch ON.
4. With the engine running, touch "START (NISSAN BASED VHCL)", "AIR LEVELIZER", "SELF-DIAG RESULTS" in order on the CONSULT-II screen.
CAUTION:
When "START (NISSAN BASED VHCL)" is touched immediately after starting the engine or turning
on the ignition switch, "AIR LEVELIZER" might not be displayed in the "SELECT SYSTEM" screen.
In this case, repeat the operation from step 4.
5. The self-diagnostic results are displayed. (If necessary, the self-diagnostic results can be printed out by touching "COPY".)

When "NO DTC IS DETECTED" is displayed, check the CK SUSP indicator lamp.
6. Conduct the appropriate inspection from the display item list, and repair or replace the malfunctioning component.
7. Start and run the vehicle for approximately 1 minute.
8. Turn ignition switch OFF to prepare for erasing the memory.
9. Start the engine and touch "START (NISSAN BASED VHCL)", "AIR LEVELIZER", "SELF-DIAG RESULTS", "ERASE" in order on the CONSULT-II screen to erase the error memory.
If "AIR LEVELIZER" is not indicated, go to GI-40, "
CONSULT-II Data Link Connector (DLC) Circuit" .
CAUTION:
If the error memory is not erased, re-conduct the operation from step 7.
10. For the final inspection, start and run the vehicle for approximately 1 minute and confirm that the CK SUSP indicator lamp is off.
Display Item List
BCIA0031E
Self-diagnostic item Malfunction detecting condition Check system
Vehicle height sensor
[C1801] Vehicle height sensor voltage is less than 0.2V or greater than
4.8V for more than 60 seconds. Refer to
RSU-18, "
Height
Sensor System Inspection" .
Compressor relay
[C1802] 1. Driving transistor for compressor relay is off and monitor volt-
age continues high level for more than 10 seconds.
2. Driving transistor for compressor relay is on and monitor volt- age continues low level for more than 5 seconds. Refer to
RSU-21, "
Compres-
sor Motor, Compressor
Motor Relay and Circuit
Inspection" .
Exhaust solenoid
[C1803] 1. Driving transistor for exhaust solenoid is off and monitor volt-
age continues high level for more than 10 seconds.
2. Driving transistor for exhaust solenoid is on and monitor volt- age continues low level for more than 5 seconds. Refer to
RSU-19, "
Exhaust
Valve Solenoid System
Inspection" .

TROUBLE DIAGNOSISRSU-15
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WORK SUPPORT
Operation Procedure
1. After turning OFF the ignition switch, connect CONSULT-II and the CONSULT-II CONVERTER to the data
link connector.
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carries out CAN communication.
2. Touch "START (NISSAN BASED VHCL)", "AIR LEVELIZER", "WORK SUPPORT" in order on the CON- SULT-II screen.
If "AIR LEVELIZER" is not indicated, go to GI-40, "
CONSULT-II Data Link Connector (DLC) Circuit" .
CAUTION:
When "START (NISSAN BASED VHCL)" is touched immediately after starting the engine or turning
on the ignition switch, "AIR LEVELIZER" might not be displayed in the "SELECT SYSTEM" screen.
In this case, repeat the operation from step 2.
3. Select "STANDARD HEIGHT LEVEL", "ADJUST HEIGHT INI" or "CLEAR HEIGHT INI" on the "SELECT WORK ITEM" screen.
NOTE:
Read and perform screen instructions if "STANDARD HEIGHT LEVEL" or "ADJUST HEIGHT INI" is
selected.
4. Touch "START" to begin the desired work support.
Display Item List
Vehicle height adjusting trouble
(compressor)
[C1804] Continuous compressor relay ON time is more than 120 sec-
onds. Refer to
RSU-21, "Compres-
sor Motor, Compressor
Motor Relay and Circuit
Inspection" .
Vehicle height adjusting trouble
(exhaust solenoid)
[C1805] Continuous exhaust solenoid ON time is more than 120 seconds. Refer to
RSU-19, "
Exhaust
Valve Solenoid System
Inspection" .
Vehicle height sensor locking trou-
ble
[C1806] Output sensor voltage variation ±
0.02V is more than 100 hour
when vehicle height range is normal. Refer to
RSU-18, "
Height
Sensor System Inspection" .
Sensor 5V trouble
[C1807] Sensor reference voltage is less than 0.8V or more than 6V for
20 seconds. Refer to
RSU-18, "
Height
Sensor System Inspection" .
Integral time trouble by supplying
air
[C1808] Integral discontinuous time on the compressor is more than 180
seconds. Refer to
RSU-21, "
Compres-
sor Motor, Compressor
Motor Relay and Circuit
Inspection" .
Self-diagnostic item
Malfunction detecting condition Check system
ItemDescription Condition
STANDARD HEIGHT LEVEL Resets the vehicle height to the initialization flag
setting stored in the suspension control unit. Vehicle unladen
RSU-49, "
Wheelarch Height
(Unladen*1 )" , set in a horizontal position and
not moving.
NOTE:
Do not take your eyes off the vehicle while
CONSULT-II is processing.
ADJUST HEIGHT INI Sets the height initialization flag in the suspension
control unit when the control unit has been replaced
or when the initialization flag has been cleared
using the "CLEAR HEIGHT INI" procedure. Vehicle unladen
RSU-49, "
Wheelarch Height
(Unladen*1 )" . Move vehicle forward and
backward approx. 5 m (16.4 ft) and rock vehi-
cle from side to side.
NOTE:
Do not move vehicle while CONSULT-II is pro-
cessing.
CLEAR HEIGHT INI Clears the initialization flag in the suspension con-
trol unit. Vehicle unladen
RSU-49, "
Wheelarch Height
(Unladen*1 )" .