2011 INFINITI QX56 ground

B2503, B2504 SWIVEL ACTUATOREXL-67
< DTC/CIRCUIT DIAGNOSIS > [XENON TYPE]
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G H
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EXL
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Is the inspection result normal?
YES >> GO TO 10.
NO >> Replace AFS control unit. Refer to EXL-135, "
Removal and Installation"
10.CHECK SWIVEL POSITION SENSOR GROUND OPEN CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect AFS control unit connector and headlamp swivel actuator connector.
3. Check continuity between AFS control unit har ness connector and headlamp swivel actuator harness
connector.
Is the inspection result normal?
YES >> Replace front combination lamp.
NO >> Repair or replace harnesses.
Component InspectionINFOID:0000000006213931
1.CHECK SWIVEL MOTOR SINGLE PART
1. Disconnect swivel actuator connector.
2. Check resistance among each swivel actuator connector terminals.
Is the inspection result normal?
YES >> Swivel actuator is normal.
NO >> Replace front combination lamp.
AFS control unit Headlamp swivel actuator Continuity
Connector Terminal Connector Terminal
RH M135 2E123
6 Existed
LH 27 E122
Swivel actuator Resistance
(Approx.)
Te r m i n a l Te r m i n a l
37 7.2 Ω
48
3410 M Ω or more
Revision: 2010 May2011 QX56

EXL-68
< DTC/CIRCUIT DIAGNOSIS >[XENON TYPE]
B2513 HEIGHT SENSOR UNUSUAL [FR]
B2513 HEIGHT SENSOR UNUSUAL [FR]
DTC LogicINFOID:0000000006213932
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC ERASE
Erase the DTC memory of AFS with CONSULT-III.
>> GO TO 2.
2.DTC CONFIRMATION
1. Start the engine.
2. Turn the headlamp ON.
3. Select the self-diagnosis with CONSULT-III.
4. Check the self-diagnosis result. Refer to EXL-39, "
DTC Index".
Is DTC
“B2513” detected?
YES >> Refer to EXL-68, "Diagnosis Procedure".
NO >> Refer to GI-40, "
Intermittent Incident".
Diagnosis ProcedureINFOID:0000000006213933
1.CHECK HEIGHT SENSOR SIGNAL INPUT
1. Turn ignition switch ON.
2. Check voltage between AFS control unit harness connector and ground.
Is the measurement value within the standard value?
YES >> Replace AFS control unit. Refer to EXL-135, "Removal and Installation"
Less than the standard value >>GO TO 2.
Higher than the standard value>>GO TO 5.
2.CHECK HEIGHT SENSOR POWER SUPPLY CIRCUIT INPUT VOLTAGE
1. Turn ignition switch OFF.
2. Disconnect front height sensor connector.
3. Turn ignition switch ON.
4. Check voltage between front height sensor harness connector and ground.
DTC No. Trouble diagnosis name DTC detection condition Possible cause
B2513 Height sensor unusual [FR] An applicable DTC is indicated when any of the
following conditions is detected continuously
for 2 seconds or more.
 The front height sensor power supply is 6 V
or more, or 4 V or less.
 The front height sensor signal is 0.25 V or less, or 4.75 V or more. Front height sensor
 Front height sensor
 Harness and connector
 AFS control unit
(+)
(− ) Vo l ta g e
(Approx.)
AFS control unit
Connector Terminal M135 23 Ground 0.25 - 4.75 V
(+) (− ) Vo l ta g e
(Approx.)
Front height sensor
Connector Terminal E208 1 Ground 5 V
Revision: 2010 May2011 QX56

B2513 HEIGHT SENSOR UNUSUAL [FR]EXL-69
< DTC/CIRCUIT DIAGNOSIS > [XENON TYPE]
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G H
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M A
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EXL
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O P
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 harnes s connector and front height sensor harness connector.
4. Check continuity between AFS control unit harness connector and ground.
Is the inspection result normal?
YES >> Replace front 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 harnes s connector and front 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 connecto r and front height sensor connector.
3. Check continuity between AFS control unit harnes s connector and front height sensor harness connector.
AFS control unit Front height sensor
Continuity
Connector Terminal Connector Terminal
M135 23 E208 2 Existed
AFS control unit GroundContinuity
Connector Terminal
M135 23 Not existed
AFS control unit Front height sensor Continuity
Connector Terminal Connector Terminal
M135 5 E208 1 Existed
AFS control unit GroundContinuity
Connector Terminal
M135 5 Not existed
(+) (− ) Vol tag e
(Approx.)
AFS control unit
Connector Terminal M135 10 Ground 0 V
Revision: 2010 May2011 QX56

B2514 HEIGHT SENSOR UNUSUAL [RR]EXL-71
< DTC/CIRCUIT DIAGNOSIS > [XENON TYPE]
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G H
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M A
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EXL
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B2514 HEIGHT SENSOR UNUSUAL [RR]
DTC LogicINFOID:0000000006213934
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC ERASE
Erase the DTC memory of AFS with CONSULT-III.
>> GO TO 2.
2.DTC CONFIRMATION
1. Start the engine.
2. Turn the headlamp ON.
3. Select the self-diagnos is with CONSULT-III.
4. Check the self-diagnosis result. Refer to EXL-39, "
DTC Index".
Is DTC
“B2514” detected?
YES >> Refer to EXL-71, "Diagnosis Procedure".
NO >> Refer to GI-40, "
Intermittent Incident".
Diagnosis ProcedureINFOID:0000000006213935
1.CHECK HEIGHT SENSOR SIGNAL INPUT
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 >> Replace AFS control unit. Refer to EXL-135, "Removal and Installation"
Less than the standard value >>GO TO 2.
Higher than the standard value>>GO TO 5.
2.CHECK HEIGHT SENSOR POWER SUPPLY CIRCUIT INPUT VOLTAGE
1. Turn ignition switch OFF.
2. Disconnect rear height sensor connector.
3. Turn ignition switch ON.
4. Check voltage between rear height sensor harness connector and ground.
DTC No. Trouble diagnosis name DTC detection condition Possible cause
B2514 Height sensor unusual [RR] An applicable DTC is indicated when any of the fol-
lowing conditions is detected continuously for 2
seconds or more.
 The rear height sensor power supply is 6 V or
more, or 4 V or less.
 The rear height sensor signal is 0.25 V or less, or 4.75 V or more. Rear height sensor
 Rear height sensor
 Harness and connector
 AFS control unit
(+)
(− ) Vol tag e
(Approx.)
AFS control unit
Connector Terminal M135 28 Ground 0.25 - 4.75 V
(+) (− ) Vol tag e
(Approx.)
Rear height sensor
Connector Terminal C15 1 Ground 5 V
Revision: 2010 May2011 QX56

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

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-78
< DTC/CIRCUIT DIAGNOSIS >[XENON TYPE]
B2521 ECU CIRCUIT
Is the measurement value within the standard value?
YES >> Replace AFS control unit. Refer to
EXL-135, "Removal and Installation"
Less than the standard value >>GO TO 5.
Higher than the standard value>>GO TO 6.
3.CHECK EACH SENSOR POWER SUPPLY SHORT CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect AFS control unit connector.
3. 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.
4.CHECK EACH SENSOR POWER SUPPLY SHORT CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect AFS control unit connector.
3. Check voltage 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 EACH SENSOR SIGNAL SHORT CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect AFS control unit connector.
3. Check continuity between AFS control unit harness connector and ground.
(+)
(− ) Vo l ta g e
(Approx.)
AFS control unit
Connector Terminal
M135 9
Ground 0.25 - 4.75 V
23
28
29
AFS control unit
GroundContinuity
Connector Terminal
M135 4
Not existed
5
6
24
(+) (− ) Vo l ta g e
(Approx.)
AFS control unit
Connector Terminal
M135 4
Ground 0 V
5
6
24
Revision: 2010 May2011 QX56

B2521 ECU CIRCUITEXL-79
< DTC/CIRCUIT DIAGNOSIS > [XENON TYPE]
C
D
E
F
G H
I
J
K
M A
B
EXL
N
O P
Is the inspection result normal?
YES >> Replace AFS control unit. Refer to EXL-135, "Removal and Installation"
NO >> Repair or replace harness.
6.CHECK EACH SENSOR SIGNAL SHORT CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect AFS control unit connector.
3. Turn ignition switch ON.
4. Check voltage between AFS cont rol 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.
AFS control unit
GroundContinuity
Connector Terminal
M135 9
Not existed
23
28
29
(+)
(− ) Vol tag e
(Approx.)
AFS control unit
Connector Terminal
M135 9
Ground 0 V
23
28
29
Revision: 2010 May2011 QX56