2011 INFINITI QX56 BATTERY

B2403 ENCODERDLK-85
< DTC/CIRCUIT DIAGNOSIS >
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B2403 ENCODER
DTC LogicINFOID:0000000006225880
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Check “Self Diagnostic Result” mode of “AUTOMAT IC BACK DOOR CONTROL UNIT” using CONSULT-
III.
Is DTC detected?
YES >> Refer to DLK-85, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006225881
1.CHECK AUTOMATIC BACK DOOR CONTROL MODULE POWER SUPPLY AND GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check automatic back door control module power supply and ground circuit. Refer to DLK-116, "
AUTOMATIC BACK DOOR CONTROL UNIT : Diagnosis Procedure".
Is the inspection result normal?
YES >> Replace automatic back door control module. Refer to DLK-262, "Removal and Installation".
NO >> Repair or replace the malfunctioning parts.
DTC CONSULT-III dis-
play description DTC detecting condition Possible cause
B2403 PULSE ENCODER When the automatic back door control unit can not re-
ceive the signal from the encoder just after starting the
open/close operation  Battery voltage (low battery)
 Automatic back door control mod-
ule
Revision: 2010 May2011 QX56

DLK-86
< DTC/CIRCUIT DIAGNOSIS >
B2409 HALF LATCH SWITCH
B2409 HALF LATCH SWITCH
DTC LogicINFOID:0000000006225882
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Check “Self Diagnostic Result” mode of “AUTOMAT IC BACK DOOR CONTROL UNIT” using CONSULT-
III.
Is DTC detected?
YES >> Refer to DLK-86, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006225883
1.CHECK HALF LATCH SWITCH SIGNAL
1. Select “AUTOMATIC BACK DOOR CONTROL UNIT” using CONSULT-III.
2. Select “HALF LATCH SW” in “DATA MONITOR” mode.
3. Check that the function operates normall y according to the following conditions.
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 2.
2.CHECK HALF LATCH INPUT SIGNAL
1. Turn ignition switch OFF.
2. Disconnect back door lock assembly connector.
3. Check voltage between back door lock assembly harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3.
3.CHECK HALF LATCH SWITCH CIRCUIT
1. Disconnect automatic back door control module connector.
2. Check continuity between automatic back door control module harness connector and back door lock
assembly harness connector.
DTC CONSULT-III display
description DTC detecting condition Possible cause
B2409 HALF LATCH SW When the automatic back door control unit can not
detects the half latch switch ON condition even
when the back door is in the open position  Half latch switch
 Harness or connectors
(Half latch switch circuit is open)
 Automatic back door control mod-
ule
Monitor item Condition Status
HALF LATCH SW Back door Fully closed/Half latch OFF
Open ON
(+)
(–)Voltag e
(Approx.)
Back door lock assembly
Connector Terminal D157 6 Ground Battery voltage
Revision: 2010 May2011 QX56

DLK-92
< DTC/CIRCUIT DIAGNOSIS >
B2419 OPEN SWITCH
B2419 OPEN SWITCH
DTC LogicINFOID:0000000006225891
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Check “Self Diagnostic Result” mode of “AUTOMAT IC BACK DOOR CONTROL UNIT” using CONSULT-
III.
Is DTC detected?
YES >> Refer to DLK-92, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006225892
1.CHECK OPEN SWITCH SIGNAL
1. Select “AUTOMATIC BACK DOOR CONTROL UNIT” using CONSULT-III.
2. Select “OPEN SW” in “DATA MONITOR” mode.
3. Check that the function operates normall y according to the following conditions.
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 2.
2.CHECK AUTOMATIC BACK DOOR CONTROL MODULE OUTPUT SIGNAL
1. Turn ignition switch OFF.
2. Disconnect back door lock assembly connector.
3. Check voltage between back door lock assembly harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3.
DTC CONSULT-III display
description DTC detecting condition Possible cause
B2419 OPEN SW When the automatic back door control unit detects
any of the following conditions
 The change of open switch cannot be detected
for 1 second or more after starting the closure
open output for the 3rd time in a row
 The change of open switch cannot be detected for 0.5 second or more after starting the closure
close output for the 3rd time in a row
 The condition that the open switch is in the ON position and the close switch is in the OFF posi-
tion is detected when starting the closure open/
close output for the 3rd time in a row  Open switch
 Harness or connectors
(Open switch circuit is open or
shorted)
 Automatic back door control mod- ule
Monitor item Condition Status
OPEN SW Back door Fully closed/Half latch OFF
Open ON
(+)
(–)Voltag e
(Approx.)
Back door lock assembly
Connector Terminal D157 4 Ground Battery voltage
Revision: 2010 May2011 QX56

B2420 CLOSE SWITCHDLK-95
< DTC/CIRCUIT DIAGNOSIS >
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B2420 CLOSE SWITCH
DTC LogicINFOID:0000000006225894
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Check “Self Diagnostic Result” mode of “AUTOMAT IC BACK DOOR CONTROL UNIT” using CONSULT-
III.
Is DTC detected?
YES >> Refer to DLK-95, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006225895
1.CHECK CLOSE SWITCH SIGNAL
1. Select “AUTOMATIC BACK DOOR CONTROL UNIT” using CONSULT-III.
2. Select “CLOSE SW” in “DATA MONITOR” mode.
3. Check that the function operates normall y according to the following conditions.
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 2.
2.CHECK AUTOMATIC BACK DOOR CONTROL MODULE OUTPUT SIGNAL
1. Turn ignition switch OFF.
2. Disconnect back door lock assembly connector.
3. Check voltage between back door lock assembly harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3.
3.CHECK CLOSE SWITCH CIRCUIT
1. Disconnect automatic back door control module connector.
2. Check continuity between automatic back door control module harness connector and back door lock
assembly harness connector.
DTC CONSULT-III display
description DTC detecting condition Possible cause
B2420 CLOSE SW When the automatic back door control unit detects
any of the following conditions
 The change of close switch cannot be detected
for 3 second or more after starting the closure
close output for the 3rd time in a row  Close switch
 Harness or connectors
(Close switch circuit is open or
shorted)
 Automatic back door control mod- ule
Monitor item Condition Status
CLOSE SW Back door Open/Half latch OFF
Fully closed ON
(+)
(–)Voltag e
(Approx.)
Back door lock assembly
Connector Terminal D157 5 Ground Battery voltage
Revision: 2010 May2011 QX56

B2421 CLUTCH OPERATION TIMEDLK-97
< DTC/CIRCUIT DIAGNOSIS >
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B2421 CLUTCH OPERATION TIME
DTC LogicINFOID:0000000006225897
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Check “Self Diagnostic Result” mode of “AUTOMAT IC BACK DOOR CONTROL UNIT” using CONSULT-
III.
Is DTC detected?
YES >> Refer to DLK-97, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006225898
1.CHECK AUTOMATIC BACK DOOR CONTROL MODULE POWER SUPPLY AND GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check automatic back door control module power supply and ground circuit. Refer to DLK-116, "
AUTOMATIC BACK DOOR CONTROL UNIT : Diagnosis Procedure".
Is the inspection result normal?
YES >> Replace automatic back door control module. Refer to DLK-262, "Removal and Installation".
NO >> Repair or replace the malfunctioning parts.
DTC CONSULT-III display
description DTC detecting condition Possible cause
B2421 CLUTCH TIME OUT When the automatic back door control unit detects
the power distribution to the clutch for 2 minutes or
more  Automatic back door control mod-
ule
 Battery voltage (low voltage)
Revision: 2010 May2011 QX56

B2423 AUTOMATIC BACK DOOR MOTOR OPERATION TIMEDLK-99
< DTC/CIRCUIT DIAGNOSIS >
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B2423 AUTOMATIC BACK DOOR MOTOR OPERATION TIME
DTC LogicINFOID:0000000006225901
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Check “Self Diagnostic Result” mode of “AUTOMAT IC BACK DOOR CONTROL UNIT” using CONSULT-
III.
Is DTC detected?
YES >> Refer to DLK-99, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006225902
1.CHECK AUTOMATIC BACK DOOR CONTROL MODULE POWER SUPPLY AND GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check automatic back door control module power supply and ground circuit. Refer to DLK-116, "
AUTOMATIC BACK DOOR CONTROL UNIT : Diagnosis Procedure".
Is the inspection result normal?
YES >> Replace automatic back door control module. Refer to DLK-262, "Removal and Installation".
NO >> Repair or replace the malfunctioning parts.
DTC CONSULT-III display de-
scription DTC detecting condition Possible cause
B2423 ABD MTR TIME OUT When the automatic back door control unit and au-
tomatic back door motor operate in the same direc-
tion for 30 seconds or more continuously  Back door mechanism
 Automatic back door control
module
 Battery voltage (low battery)
Revision: 2010 May2011 QX56

DLK-100
< DTC/CIRCUIT DIAGNOSIS >
B2424 CLOSURE CONDITION
B2424 CLOSURE CONDITION
DTC LogicINFOID:0000000006225903
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Check “Self Diagnostic Result” mode of “AUTOMAT IC BACK DOOR CONTROL UNIT” using CONSULT-
III.
Is DTC detected?
YES >> Refer to DLK-100, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006225904
1.CHECK OPEN/CLOSE SWITCH SIGNAL
1. Select “AUTOMATIC BACK DOOR CONTROL UNIT” using CONSULT-III.
2. Select “CLOSE SW”, “OPEN SW” in “DATA MONITOR” mode.
3. Check that the function operates normall y according to the following conditions.
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 2.
2.CHECK AUTOMATIC BACK DOOR CONTROL MODULE OUTPUT
1. Turn ignition switch OFF.
2. Disconnect back door lock assembly connector.
3. Check voltage between back door lock assembly harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 3.
3.CHECK OPEN/CLOSE SWITCH CIRCUIT
1. Disconnect automatic back door control module connector.
DTC CONSULT-III display de-
scription DTC detecting condition Possible cause
B2424 CLSR CONDITION When the following conditions are detected after
OPEN/CLOSE operation of the back door closure
motor
 Open switch and close switch are ON  Harness or connector
(Open switch or close switch
circuit is open or shorted)
 Back door lock assembly
Monitor item Condition Status
OPEN SW Back doorHalf latch/fully closed OFF
Open ON
CLOSE SW Open/half latch OFF
Fully closed ON
(+)
(–)Vo l ta g e
(Approx.)
Back door lock assembly
Connector Terminal
D157 4
Ground Battery voltage
5
Revision: 2010 May2011 QX56

DLK-116
< DTC/CIRCUIT DIAGNOSIS >
POWER SUPPLY AND GROUND CIRCUIT
POWER SUPPLY AND GROUND CIRCUIT
AUTOMATIC BACK DOOR CONTROL UNIT
AUTOMATIC BACK DOOR CONTROL UNIT : Diagnosis ProcedureINFOID:0000000006225920
1.CHECK FUSE, FUSIBLE LINK AND CIRCUIT BREAKER
Check that the following fuse, fusible link and circuit breaker are not fusing.
Is the fuse fusing?
YES >> Replace the blown fuse or fusible link after repairing the affected circuit if a fuse or fusible link is blown.
NO >> GO TO 2.
2.CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect automatic back door control module connector.
3. Check voltage between automatic back door control module harness connector and ground.
Is the measurement value normal?
YES >> GO TO 3.
NO >> Repair or replace harness.
3.CHECK GROUND CIRCUIT
Check continuity between automatic back door control module harness connector and ground.
Does continuity exist?
YES >> INSPECTION END
NO >> Repair or replace harness.
Fuse and fusible link No. Signal name
T (30A) Battery power supply
9 (10A)
4 (10A) Ignition power supply
(+)
(− ) Condition Vol tag e
(Approx.)
Automatic back door control module
Connector Terminal
B26 9
Ground Ignition switch ON
Battery voltage
10
—
28
Automatic back door control module
GroundContinuity
Connector Terminal
B26 34 Existed
Revision: 2010 May2011 QX56