2011 INFINITI QX56 turn signal

SCS-56
< SYSTEM DESCRIPTION >[AIR LEVELIZER CONTROL SYSTEM]
DIAGNOSIS SYSTEM (AIR
LEVELIZER CONTROL MODULE)
DIAGNOSIS SYSTEM (AIR LE VELIZER CONTROL MODULE)
CONSULT-III FunctionINFOID:0000000006256052
CONSULT-III APPLICATION ITEMS
WORK SUPPORT
CAUTION:
Perform the procedure when the vehicle is stopped.
SELF DIAGNOSTIC RESULTS
Refer to SCS-59, "DTC Index".
When “CRNT” is displayed on self-diagnosis result,
 The system is presently malfunctioning.
When “PAST” is displayed on self-diagnosis result, System malfunction in the past is detect ed, but the system is presently normal.
Freeze frame data (FFD)
DATA MONITOR
Diagnostic test mode Function
Work Support This mode enables a technician to adjust some devices faster and more accurately.
Self Diagnostic Results Retrieve DTC from ECU and display diagnostic items.
Data Monitor Monitor the input/output signal of the control unit in real time.
CAN Diagnosis This mode displays a network diagnosis result about CAN by a diagram.
CAN Diagnostic Support
Monitor It monitors the status of CAN communication.
ECU Identification Display the ECU identification number (part number etc.) of the selected system.
Active Test Send the drive signal from CONSULT-III to the actuator. The operation check can be performed.
Item name Description
STANDARD HEIGHT LEVEL Forcibly sets vehicle height to the set standard vehicle height.
ADJUST HEIGHT INI Sets standard vehicle height.
CLEAR HEIGHT INI Erases standard vehicle height.
Item name Description
IGN COUNTER The number of times that ignition switch is turned ON after the DTC is detected is displayed.
 When “0” is displayed: It indicates that the system is presently malfunctioning.
 When except “0” is displayed: It indicates that system malfunction in the past is detected, but the system
is presently normal.
NOTE:
Each time when ignition switch is turned OFF to ON, numerical number increases in 1 → 2 → 3...38 → 39.
When the operation number of times exceeds 39, the number do not increase and “39” is displayed until
self-diagnosis is erased.
Monitored item (Unit) Remarks
IGN VOLT (V) Displays the power supply voltage of air levelizer control module.
VHCL HT INTLZ STA Displays setting status of standard vehicle height.
VHCL HT INIT SLCT Displays setting status of standard vehicle height.
VHCL HEIGHT SEN (V) Displays the signal voltage of vehicle height sensor.
VHCL HT CNVSN VL (mm) Displays the vehicle height recognized by air levelizer control module.
VHCL HGT FIX TIME (hour) Displays period of time that signal from vehicle height sensor does not change.
Revision: 2010 May2011 QX56

AIR LEVELIZER CONTROL MODULESCS-59
< ECU DIAGNOSIS INFORMATION > [AIR LEVELIZER CONTROL SYSTEM]
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Fail-safeINFOID:0000000006256054
If malfunction is detected, control stops.
The system may enter fail-safe mode under certain condi tions (for example, over-laden conditions) when elec-
tronic circuit is normal.
In this case, always check that the system re turns to normal by starting engine after unloading load.
DTC Inspection Priority ChartINFOID:0000000006256055
If some DTCs are displayed at the same time, per form inspections one by one based on the following priority
chart.
DTC IndexINFOID:0000000006256056
5
(W) Ground Vehicle height sensor
(SIGNAL) InputIGN ON 0.2 – 4.6 V
IGN OFF 0 V
7
(P) 16
(L) CAN-L
Input/
Output — 54 – 69
Ω
9
(P/L) Ground Air levelizer co
ntrol module
power supply InputIGN ON 10 – 16 V
IGN OFF 0 V
11
(V/W) Ground Exhaust solenoid Output IGN ON Exhaust solenoid: ON 9 – 16 V
Exhaust solenoid: OFF Less than 2 V
13
(R) Ground Vehicle height sensor
(Power supply)
OutputIGN ON 4.5 – 5.5 V
IGN OFF 0 V
16
(L) 7
(P) CAN-H Input/
Output — 54 – 69
Ω
Te r m i n a l
(Wire color) Description
ConditionReference value
(Approx.)
+ − Signal name Input/
Output
Priority Detected items (DTC)
1  U1000 CAN COMM CIRCUIT
 U1010 CONTROL UNIT (CAN)
2  C1801 VHCL HEIGHT SENSOR
 C1802 AIR SUS COMPRS RELAY
 C1803 AIR SUS EXH SOL
 C1806 VHCL HEIGHT SEN FIX
 C1807 VHCL HEIGHT SEN VOLT
3  C1804 VHCL HEIGHT ADJ UP
 C1805 VHCL HEIGHT ADJ DOWN
 C1808 AIR SUS COMPRS FNCTN
DTC CONSULT-III display Reference page
C1801 VHCL HEIGHT SENSOR SCS-69
C1802 AIR SUS COMPRS RELAYSCS-72
C1803 AIR SUS EXH SOLSCS-74
C1804 VHCL HEIGHT ADJ UPSCS-77
C1805 VHCL HEIGHT ADJ DOWNSCS-80
C1806 VHCL HEIGHT SEN FIXSCS-81
C1807 VHCL HEIGHT SEN VOLTSCS-82
C1808 AIR SUS COMPRS FNCTNSCS-84
Revision: 2010 May2011 QX56

C1801 VHCL HEIGHT SENSORSCS-69
< DTC/CIRCUIT DIAGNOSIS > [AIR LEVELIZER CONTROL SYSTEM]
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DTC/CIRCUIT DIAGNOSIS
C1801 VHCL HEIGHT SENSOR
DTC LogicINFOID:0000000006256062
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” has been previous ly conducted, always turn ignition switch OFF
andwait at least 10 seconds before conducting the next test.
>> GO TO 2.
2.CHECK DTC DETECTION
With CONSULT-III
1. Turn ignition switch ON and wait 60 seconds or more.
2. Perform “Self Diagnostic Results” in “E-SUS”.
Is
“C1801” detected ?
YES >> Go to SCS-69, "DiagnosisProcedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006256063
1.CHECK APPEARANCE
Visually check for malfunction of suspension components, installing malfunction, or deformation of vehicle
height sensor.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repaire or replace damaged parts.
2.CHECK POWER SUPPLY CIRCUIT (PART 1)
1. Disconnect vehicle height sensor connector.
2. Turn ignition switch ON. CAUTION:
Never start the engine.
3. Check voltage between vehicle height sensor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3.
3.CHECK POWER SUPPLY CIRCUIT (PART 2)
1. Turn ignition switch OFF.
2. Disconnect air levelizer control module connector.
DTC Display itemI Malfunction detected condition Possible cause
C1801 VHCL HEIGHT SENSOR Signal voltage of the vehicle height sensor remains 0.2
V or less or 4.6 V or more continuously for 60 seconds
during sensor voltage (4.5 – 5.5 V) output by the air lev-
elizer control module.  Harness or connectors
(Sensor circuit is open.)
 Vehicle height sensor
 Air levelizer control module
 Rear suspension component parts
Vehicle height sensor —Voltage
Connector Terminal
C13 1 Ground 4.5 – 5.5 V
Revision: 2010 May2011 QX56

SCS-72
< DTC/CIRCUIT DIAGNOSIS >[AIR LEVELIZER CONTROL SYSTEM]
C1802 AIR SUS COMPRS RELAY
C1802 AIR SUS COMPRS RELAY
DTC LogicINFOID:0000000006256065
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” has been previous ly conducted, always turn ignition switch OFF
andwait at least 10 seconds before conducting the next test.
>> GO TO 2.
2.CHECK DTC DETECTION
With CONSULT-III
1. Turn ignition switch ON and wait 10 seconds or more.
2. Select “COMPRESSOR” in “Active Test” in “E-SUS”.
3. Touch “ON” and wait 5 seconds or more.
4. Select “Self Diagnostic Result” in “E-SUS”.
Is
“C1802” detected ?
YES >> Go to SCS-72, "DiagnosisProcedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006256066
1.CHECK AIR COMPRESSOR ON SIGNAL FROM AIR LEVELIZER CONTROL MODULE
CONSULT-III
1. Disconnect air compressor relay connector.
2. Turn ignition switch ON. CAUTION:
Never start the engine.
3. Select “COMPRESSOR” in “Active Test” in “E-SUS”.
4. Touch “ON”.
5. While operating test item, check voltage betw een air compressor relay harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 2.
2.CHECK HARNESS BETWEEN AIR LEVELIZER CO NTROL MODULE AND AIR COMPRESSOR RELAY
1. Turn ignition switch OFF.
2. Disconnect air levelizer control module connector.
DTC Display item Malfunction detected condition Possible cause
C1802 AIR SUS COMPRS RELAY  Output voltage of the air compressor relay remains
9 V or less continuously for 5 seconds during air
compressor ON signal output by the air levelizer
control module.
 Output voltage of the air compressor relay remains
2 V or more continuously for 10 seconds during air
compressor OFF signal output by the air levelizer
control module.  Harness or connector
 Air compressor relay
 Air levelizer control module
Air compressor relay
—Voltage
Connector Terminal
E116 2 Ground 9 – 16 V
Revision: 2010 May2011 QX56

SCS-74
< DTC/CIRCUIT DIAGNOSIS >[AIR LEVELIZER CONTROL SYSTEM]
C1803 AIR SUSPENSION EXH SOL
C1803 AIR SUSPENSION EXH SOL
DTC LogicINFOID:0000000006256067
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” has been previous ly conducted, always turn ignition switch OFF
andwait at least 10 seconds before conducting the next test.
>> GO TO 2.
2.CHECK DTC DETECTION
With CONSULT-III
1. Turn ignition switch ON and wait 10 seconds or more.
2. Select “EXHAUST SOLENOID” in “Active Test” in “E-SUS”.
3. Touch “ON” and wait 5 seconds or more.
4. Select “Self Diagnostic Result” in “E-SUS”.
Is
“C1803” detected ?
YES >> Go to SCS-74, "DiagnosisProcedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006256068
1.CHECK EXHAUST SOLENOID ON SIGNAL FROM AIR LEVELIZER CONTROL MODULE
CONSULT-III
1. Disconnect air compressor harness connector.
2. Turn ignition switch ON. CAUTION:
Never start the engine.
3. Select “EXHAUST SOLENOID” in “Active Test” in “E-SUS”.
4. Touch “ON”.
5. While operating test item, check voltage bet ween air compressor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 2.
2.CHECK HARNESS BETWEEN AIR LEVELIZE R CONTROL MODULE AND AIR COMPRESSOR
1. Turn ignition switch OFF.
2. Disconnect air levelizer control module harness connector.
DTC Display item Malfunction detected condition Possible cause
C1803 AIR SUS EXH SOL  Output voltage of the exhaust solenoid remains 9 V
or less continuously for 5 seconds during exhaust
solenoid ON signal output by the air levelizer con-
trol module.
 Output voltage of the exhaust solenoid remains 2 V
or more continuously for 10 seconds during ex-
haust solenoid ON signal output by the air levelizer
control module.  Harness or connector
 Exhaust solenoid
 Air levelizer control module
Air compressor
—Voltage
Connector Terminal
C12 4 Ground 9 – 16 V
Revision: 2010 May2011 QX56

C1804 VHCL HEIGHT ADJ UPSCS-77
< DTC/CIRCUIT DIAGNOSIS > [AIR LEVELIZER CONTROL SYSTEM]
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C1804 VHCL HEIGHT ADJ UP
DTC LogicINFOID:0000000006256070
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” has been previous ly conducted, always turn ignition switch OFF
andwait at least 10 seconds before conducting the next test.
>> GO TO 2.
2.CHECK DTC DETECTION
With CONSULT-III
1. Set vehicle in the unloaded vehicle status.
2. Start the engine and wait 150 seconds or more.
3. Perform “Self Diagnostic Result” in “E-SUS”.
Is
“C1804” detected ?
YES >> Go to SCS-77, "DiagnosisProcedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006256071
1.CHECK APPEARANCE
Visually check for malfunction of suspension component s, damage of air chamber of rear shock absorber,
installation malfunction, or defo rmation of vehicle height sensor.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repaire or replace damaged parts.
2.CHECK AIR LEAK
Apply soapy water to air tube, connecting portions between air tube and each component, and air chamber of
rear shock absorber. Check for air leakage.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repaire or replace damaged parts.
3.CHECK AIR COMPRESSOR RELAY POWER SUPPLY
1. Turn ignition switch OFF.
2. Check 30A fuse (#I).
3. Disconnect air compressor relay connector.
4. Check voltage between air compressor relay harness connector and ground.
DTC Display item Malfunction detected condition Possible cause
C1804 VHCL HEIGHT ADJ UP The vehicle height is 15 mm (0.59 in) or more lower
than the reference height despite the output of air
compressor ON signal continuously for 120 seconds
by the air levelizer control module.  Harness or connector
Air compressor
 Air compressor relay
 Air levelizer control module
 Rear shock absorber (air cham-
ber)
 Vehicle height sensor
 Air tube
 Rear suspension component parts
 Overloaded
Revision: 2010 May2011 QX56

SCS-80
< DTC/CIRCUIT DIAGNOSIS >[AIR LEVELIZER CONTROL SYSTEM]
C1805 VHCL HE
IGHT ADJ DOWN
C1805 VHCL HEIGHT ADJ DOWN
DTC LogicINFOID:0000000006256074
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” has been previous ly conducted, always turn ignition switch OFF
andwait at least 10 seconds before conducting the next test.
>> GO TO 2.
2.CHECK DTC DETECTION
With CONSULT-III
1. Start the engine and wait 150 seconds or more.
2. Perform “Self Diagnostic Result” in “E-SUS”.
Is
“C1805” detected ?
YES >> Go to SCS-80, "DiagnosisProcedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006256075
1.CHECK APPEARANCE
Visually check for malfunction of suspension components, crush of air tube, installation malfunction, or defor-
mation of vehicle height sensor.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repaire or replace damaged parts.
2.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
Is the inspection result normal?
YES >> Perform “STANDARD VEHICLE HEIGHT SETTING”. Refer to SCS-67, "Work Procedure".
NO >> Repair or replace damaged part.
DTC Display item Malfunction detected condition Possible cause
C1805 VHCL HEIGHT ADJ DOWN The vehicle height is 15 mm (0.59 in) or more raise than
the reference height despite the output of exhaust sole-
noid ON signal continuously for 120 seconds by the air
levelizer control module.  Harness or connector
 Vehicle height sensor
Air compressor
(exhaust sole-
noid)
Air tube
 Rear suspension component
parts
Revision: 2010 May2011 QX56

C1806 VHCL HEIGHT SEN FIXSCS-81
< DTC/CIRCUIT DIAGNOSIS > [AIR LEVELIZER CONTROL SYSTEM]
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C1806 VHCL HEIGHT SEN FIX
DTC LogicINFOID:0000000006256076
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” has been previous ly conducted, always turn ignition switch OFF
andwait at least 10 seconds before conducting the next test.
>> GO TO 2.
2.CHECK VEHICLE HEIGHT SENSOR FIXATION
With CONSULT-III
1. Start the engine.
2. Select “VHCL HEIGHT SEN” in “Data Monitor” in “E-SUS”.
3. Drive vehicle and maintain the following conditions for 5 minutes or more.
Does the value of
“VHCL HEIGHT SEN” change?
YES >> INSPECTION END
NO >> Go to SCS-81, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000006256077
1.CHECK APPEARANCE
Visually check for installation malfunction, or deformation of vehicle height sensor.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repaire or replace damaged parts.
2.CHECK VEHICLE HEIGHT SENSOR
Check the vehicle height sensor. Refer to SCS-70, "
Component Inspection".
Is the inspection result normal?
YES >> Check intermittent incident. Refer to GI-40, "Intermittent Incident".
NO >> Replace the vehicle height sensor. Refer to SCS-98, "
Removal and Installation".
DTC Display item Malfunction detected condition Possible cause
C1806 VHCL HEIGHT SEN FIX The signal voltage of the vehicle height sensor does
not change for cumulated time of 100 hours under the
condition that the air levelizer control module outputs
sensor voltage (4.5 – 5.5 V) with vehicle speeds 2
km/h (2 MPH) or more.  Harness or connector
 Vehicle height sensor
Vehicle speed : 5 km/h (3 MPH) or more
Revision: 2010 May2011 QX56