2011 INFINITI QX56 height

EXL-72
< DTC/CIRCUIT DIAGNOSIS >[XENON TYPE]
B2514 HEIGHT SENSOR UNUSUAL [RR]
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 4.
3.CHECK HEIGHT SENSOR SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect AFS control unit connector.
3. Check continuity between AFS control unit harne ss connector and rear height sensor harness connector.
4. Check continuity between AFS control unit harness connector and ground.
Is the inspection result normal?
YES >> Replace rear height sensor. Refer to EXL-136, "Removal and Installation".
NO >> Repair or replace harness.
4.CHECK HEIGHT SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect AFS control unit connector.
3. Check continuity between AFS control unit harne ss connector and rear height sensor harness connector.
4. Check continuity between AFS control unit harness connector and ground.
Is the inspection result normal?
YES >> Replace AFS control unit. Refer to EXL-135, "Removal and Installation"
NO >> Repair or replace harness.
5.CHECK HEIGHT SENSOR GROUND CIRCUIT VOLTAGE OUTPUT
Check voltage between AFS control unit harness connector and ground.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Replace AFS control unit. Refer to EXL-135, "
Removal and Installation"
6.CHECK HEIGHT SENSOR GROUND OPEN CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect AFS control unit connector and rear height sensor connector.
3. Check continuity between AFS control unit harne ss connector and rear height sensor harness connector.
AFS control unit Rear height sensor
Continuity
Connector Terminal Connector Terminal
M135 28 C15 2 Existed
AFS control unit GroundContinuity
Connector Terminal
M135 28 Not existed
AFS control unit Rear height sensor Continuity
Connector Terminal Connector Terminal
M135 6 C15 1 Existed
AFS control unit GroundContinuity
Connector Terminal
M135 6 Not existed
(+) (− ) Vo l ta g e
(Approx.)
AFS control unit
Connector Terminal M135 8 Ground 0 V
Revision: 2010 May2011 QX56

B2514 HEIGHT SENSOR UNUSUAL [RR]EXL-73
< DTC/CIRCUIT DIAGNOSIS > [XENON TYPE]
C
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G H
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M A
B
EXL
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Is the inspection result normal?
YES >> Replace rear height sensor. Refer to EXL-136, "Removal and Installation".
NO >> Repair or replace harness.
AFS control unit Rear height sensor Continuity
Connector Terminal Connector Terminal
M135 8 C15 3 Existed
Revision: 2010 May2011 QX56

EXL-76
< DTC/CIRCUIT DIAGNOSIS >[XENON TYPE]
B2519 LEVELIZER CALIBRATION
B2519 LEVELIZER CALIBRATION
DTC LogicINFOID:0000000006213940
Diagnosis ProcedureINFOID:0000000006213941
1.LEVELIZER ADJUSTMENT
Perform the levelizer adjustment.
>> Refer to EXL-61, "
LEVELIZER ADJUSTMENT : Special Repair Requirement".
DTC No. Trouble diagnosis name DTC detection condition Possible causes
B2519 Levelizer calibration The height sensor adjustment position is not
recognized.AFS control unit
Revision: 2010 May2011 QX56

B2521 ECU CIRCUITEXL-77
< DTC/CIRCUIT DIAGNOSIS > [XENON TYPE]
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B2521 ECU CIRCUIT
DTC LogicINFOID:0000000006213942
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC ERASE
Erase the DTC memory of AFS with CONSULT-III.
>> GO TO 2.
2.DTC CONFIRMATION PROCEDURE
1. Turn ignition ON.
2. Select the self-diagnos is with CONSULT-III.
3. Check the self-diagnosis result. Refer to EXL-39, "
DTC Index".
Is DTC
“B2521” detected?
YES >> Refer to EXL-77, "Diagnosis Procedure".
NO >> Refer to GI-40, "
Intermittent Incident".
Diagnosis ProcedureINFOID:0000000006213943
1.CHECK EACH SENSOR POWER SUPPLY
1. Turn ignition switch ON.
2. Check voltage between AFS cont rol unit harness connector and ground.
Is the measurement value within the standard value?
YES >> GO TO 2.
Less than the standard value >>GO TO 3.
Higher than the standard value>>GO TO 4.
2.CHECK EACH SENSOR SIGNAL
Check voltage between AFS control unit harness connector and ground.
DTC No. Trouble diagnosis name Error detection condition Possible cause
B2512 ECU circuit  AFS control unit indicates an applicable
DTC when detecting any of the following
conditions continuously for 2 seconds or
more.
- The swivel position sensor is shorted to
the power supply or the ground.
- The swivel position sensor signal is shorted to the ground.
- The height sensor power supply is short- ed to the power supply or the ground.
- The height sensor signal is shorted to
the ground.
 AFS control unit RAM/ROM error Swivel position sensor
 Swivel position sensor
 Harness and connector
 AFS control unit
Height sensor
 Height sensor
 Harness and connector
 AFS control unit
AFS control unit (RAM/
ROM)
 AFS control unit
(+)
(− ) Vol tag e
(Approx.)
AFS control unit
Connector Terminal
M135 4
Ground 5 V
5
6
24
Revision: 2010 May2011 QX56

EXL-122
< PERIODIC MAINTENANCE >[XENON TYPE]
HEADLAMP AIMING ADJUSTMENT
Aiming Adjustment Procedure
INFOID:0000000006369513
1. Place the screen. NOTE:
 Stop the vehicle facing the wall.
 Place the board on a plain road vertically.
2. Face the vehicle with the screen. Maintain 10 m (32.8 ft) between the headlamp center and the screen.
3. Start the engine. Turn the headlamp (LO) ON. NOTE:
Shut off the headlamp light with the board to prevent from illuminating the adjustment screen.
CAUTION:
Never cover the lens surface with a tape etc. The lens is made of resin.
4. Measure the distance (X) between the horizontal cent er line of headlamp (H) and the cutoff line (A) within
the light axis measurement range (R) from the vertical center line ahead of headlamp (V).
Low beam distribution on the screen
5. Adjust the cutoff line height (X) with the aiming adjus tment screw so as to enter in the adjustment range
(M–N) according to the horizontal center line of headlamp (H).
unit: mm (in)
Side view
Adjustment screw Screw driver rotation Facing direction
A Headlamp RH HI/LO (UP/DOWN) Clockwise UP
Counterclockwise DOWN
B Headlamp LH HI/LO (UP/DOWN) Clockwise UP
Counterclockwise DOWN
Light axis measurement range (R) : 350 ± 175 mm (13.78 ± 6.89 in)
JSLIA0005ZZ
Horizontal center line of headlamp (H) Highest cutoff line height (M) Lowest cutoff line height (N)
700 (27.56) or less 4 (0.16) 30 (1.18)
701(27.60) – 800 (31.50) 4 (0.16) 30 (1.18) 801 (31.54) or more 17 (0.67) 44 (1.73)
JSLIA0006ZZ
Distance between the headlamp center and the screen (L) : 10 m (32.8 ft)
Revision: 2010 May2011 QX56

FRONT FOG LAMP AIMING ADJUSTMENTEXL-123
< PERIODIC MAINTENANCE > [XENON TYPE]
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FRONT FOG LAMP AI MING ADJUSTMENT
DescriptionINFOID:0000000006213992
PREPARATION BEFORE ADJUSTING
NOTE:
 For details, refer to the regulations in your own country.
 Perform aiming if the vehicle front body has been repaired and/or the headlamp assembly has been
replaced.
Before performing aiming adjustm ent, check the following.  Adjust the tire pressure to the specification.
 Fill with fuel, engine coolant and each oil.
 Maintain the unloaded vehicle condition. (Remove luggage from the passenger compartment and the trunk
room.)
NOTE:
Do not remove the temporary tire, jack and on-vehicle tool.
 Wipe out dirt on the headlamp. CAUTION:
Never use organic solvent (thinner, gasoline etc.)
 Ride alone on the driver seat.
AIMING ADJUSTMENT SCREW
 Turn the aiming adjusting screw for adjustment.
 For the position and direction of the adjusting screw, refer to the figure.
NOTE:
A screwdriver or hexagonal wrench [6 mm (0.24 in)] can be used
for adjustment.
Aiming Adjustment ProcedureINFOID:0000000006213993
1. Place the screen. NOTE:
 Stop the vehicle facing the wall.
 Place the board on a plain road vertically.
2. Face the vehicle with the screen. Maintain 10 m (32.8 ft) between the front fog lamp center and the
screen.
3. Start the engine. Turn the front fog lamp ON. NOTE:
Shut off the headlamp light with the board to pr event from illuminating the adjustment screen.
CAUTION:
Never cover the lens surface with a tape etc. The lens is made of resin.
4. Adjust the cutoff line height (A) with the aiming adjus tment screw so that the distance (X) between the hor-
izontal center line of front fog lamp (H) and (A) becomes 200 mm (7.87 in).
A: UP
B: DOWN
JPLIA0915ZZ
Revision: 2010 May2011 QX56

EXL-124
< PERIODIC MAINTENANCE >[XENON TYPE]
FRONT FOG LAMP AIMING ADJUSTMENT
Front fog lamp light distribution on the screen
JPLIA0008ZZ
A : Cutoff line
B : High illuminance area
H : Horizontal center line of front fog lamp
V : Vertical center line of front fog lamp
X : Cutoff line height
Revision: 2010 May2011 QX56

EXL-136
< REMOVAL AND INSTALLATION >[XENON TYPE]
HEIGHT SENSOR
HEIGHT SENSOR
Exploded ViewINFOID:0000000006369480
FRONT HEIGHT SERSOR
REAR HEIGHT SENSOR
Removal and InstallationINFOID:0000000006369481
REMOVAL
Front height sensor
1. Disconnect height sensor connector.
2. Remove height sensor mounting nuts.
1. Front height sensor 2. Front member side RH 3. Front suspension upper link
: Vehicle front
Refer to GI-4, "
Components" for symbols in the figure.
JMLIA1124GB
1. Rear suspension member 2. Rear height sensor 3. Rear suspension lower link
: Vehicle front
Refer to GI-4, "
Components" for symbols in the figure.
JMLIA1125GB
Revision: 2010 May2011 QX56