2010 INFINITI QX56 B2126

ADP-2
DTC Logic ...............................................................35
Diagnosis Procedure .............................................35
B2117 ADJ PEDAL MOTOR .............................36
Description ..............................................................36
DTC Logic ...............................................................36
Diagnosis Procedure .............................................36
B2118 TILT SENSOR ........................................38
Description ........................................................... ...38
DTC Logic ...............................................................38
Diagnosis Procedure .............................................38
B2120 ADJ PEDAL SENSOR ...........................40
Description ........................................................... ...40
DTC Logic ...............................................................40
Diagnosis Procedure .............................................40
B2126 DETENT SW ...........................................42
Description ........................................................... ...42
DTC Logic ...............................................................42
Diagnosis Procedure .............................................42
B2128 UART COMMUNICATION LINE ............44
Description ........................................................... ...44
DTC Logic ...............................................................44
Diagnosis Procedure .............................................44
POWER SUPPLY AND GROUND CIRCUIT .....46
BCM ........................................................................ ...46
BCM : Diagnosis Procedure ...................................46
DRIVER SEAT CONTROL UNIT ........................... ...47
DRIVER SEAT CONTROL UNIT :
Diagnosis Procedure .............................................
47
DRIVER SEAT CONTROL UNIT : Special Repair
Requirement ........................................................ ...
48
AUTOMATIC DRIVE POSITIONER CONTROL
UNIT ....................................................................... ...
48
AUTOMATIC DRIVE POSITIONER CONTROL
UNIT : Diagnosis Procedure ............................... ...
48
AUTOMATIC DRIVE POSITIONER CONTROL
UNIT : Special Repair Re quirement .......................
48
SLIDING SWITCH ..............................................50
Description ........................................................... ...50
Component Function Check .................................50
Diagnosis Procedure .............................................50
Component Inspection ............................................51
RECLINING SWITCH ........................................53
Description ........................................................... ...53
Component Function Check .................................53
Diagnosis Procedure .............................................53
Component Inspection ............................................54
LIFTING SWITCH (FRONT) ..............................56
Description ........................................................... ...56
Component Function Check .................................56
Diagnosis Procedure .............................................56
Component Inspection ......................................... ...57
LIFTING SWITCH (REAR) ................................59
Description ........................................................... ...59
Component Function Check ..................................59
Diagnosis Procedure ..............................................59
Component Inspection ............................................60
TILT SWITCH ....................................................62
Description ........................................................... ...62
Component Function Check ..................................62
Diagnosis Procedure ..............................................62
Component Inspection ............................................63
PEDAL ADJUSTING SWITCH ..........................65
Description ........................................................... ...65
Component Function Check ..................................65
Diagnosis Procedure ..............................................65
Component Inspection ............................................67
SEAT MEMORY SWITCH .................................68
Description ..............................................................68
Component Function Check ..................................68
Diagnosis Procedure ..............................................68
Component Inspection ............................................69
DOOR MIRROR REMOTE CONTROL
SWITCH .............................................................
70
CHANGEOVER SWITCH ....................................... ...70
CHANGEOVER SWITCH : Description ..................70
CHANGEOVER SWITCH : Component Function
Check ......................................................................
70
CHANGEOVER SWITCH : Diagnosis Procedure ...70
CHANGEOVER SWITCH : Component Inspec-
tion ..........................................................................
72
MIRROR SWITCH .................................................. ...72
MIRROR SWITCH : Description .............................72
MIRROR SWITCH : Component Function Check ...72
MIRROR SWITCH : Diagnosis Procedure ..............72
MIRROR SWITCH : Component Inspection ...........74
POWER SEAT SWITCH GROUND CIRCUIT ...76
Diagnosis Procedure ..............................................76
DETENTION SWITCH .......................................77
Description ........................................................... ...77
Component Function Check ..................................77
Diagnosis Procedure ..............................................77
FRONT DOOR SWITCH (DRIVER SIDE) .........79
Description ........................................................... ...79
Component Function Check ...................................79
Diagnosis Procedure ...............................................79
Component Inspection ............................................80
SLIDING SENSOR ............................................81
Description ..............................................................81
Component Function Check ..................................81
Diagnosis Procedure ..............................................81
Revision: April 20092010 QX56

ADP-32
< COMPONENT DIAGNOSIS >
B2112 SLIDING MOTOR
B2112 SLIDING MOTOR
DescriptionINFOID:0000000005147450
• The seat sliding motor is installed to the power seat frame assembly.
• The seat sliding motor is installed with the driver seat control unit.
• Slides the seat frontward/rearward by changing the rotation direction of sliding motor.
DTC LogicINFOID:0000000005147451
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1. STEP 1
Turn ignition switch ON.
>> GO TO 2
2. STEP 2
Check “Self diagnostic result” with CONSULT-III.
Is the DTC detected?
YES >> Perform diagnosis procedure. Refer to ADP-32, "DiagnosisProcedure".
NO >> Inspection End.
NOTE:
First perform diagnosis for B2126 if B2126 is detected. Refer to ADP-42, "
DiagnosisProcedure".
Diagnosis ProcedureINFOID:0000000005147452
1. PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Check “Self diagnostic result” with CONSULT-III.
3. Erase the DTC.
4. Perform DTC confirmation procedure. Refer to ADP-32, "
DTC Logic".
Is the DTC displayed again?
YES >> GO TO 2
NO >> Check intermittent incident. Refer to GI-38, "
Intermittent Incident".
2. CHECK COMPONENTS
Refer to ADP-81, "
ComponentFunctionCheck" and ADP-97, "ComponentFunctionCheck".
>> Inspection End.
DTC No. Trouble diagnosis
name DTC detecting condition
Possible cause
B2112 SEAT SLIDE The driver seat control unit detects the output of slid-
ing motor output terminal for 0.1 second or more
even if the sliding switch is not input.
• Driver seat control unit
Revision: April 20092010 QX56

B2113 RECLINING MOTORADP-33
< COMPONENT DIAGNOSIS >
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B2113 RECLINING MOTOR
DescriptionINFOID:0000000005147453
• The seat reclining motor is installed to the seatback assembly.
• The seat reclining motor is activated with the driver seat control unit.
• Tilts the seatback frontward/rearward by changi ng the rotation direction of reclining motor.
DTC LogicINFOID:0000000005147454
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1. STEP 1
Turn ignition switch ON.
>> GO TO 2
2. STEP 2
Check “Self diagnostic result” with CONSULT-III.
Is the DTC detected?
YES >> Perform diagnosis procedure. Refer to ADP-33, "DiagnosisProcedure".
NO >> Inspection End.
NOTE:
First perform diagnosis for B2126 if B2126 is detected. Refer to ADP-42, "
DiagnosisProcedure".
Diagnosis ProcedureINFOID:0000000005147455
1. PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Check “Self diagnostic result” with CONSULT-III.
3. Erase the DTC.
4. Perform DTC confirmation procedure. Refer to ADP-33, "
DTC Logic".
Is the DTC displayed again?
YES >> GO TO 2
NO >> Check intermittent incident. Refer to GI-38, "
Intermittent Incident".
2. CHECK COMPONENTS
Refer to ADP-83, "
ComponentFunctionCheck" and ADP-99, "ComponentFunctionCheck".
>> Inspection End.
DTC No. Trouble diagnosis
name DTC detecting condition
Possible cause
B2113 SEAT RECLINING The driver seat control unit detects the output of re-
clining motor output terminal for 0.1 second or more
even if the reclining switch is not input. • Driver seat control unit
Revision: April 20092010 QX56

ADP-34
< COMPONENT DIAGNOSIS >
B2114 SEAT LIFTER FR
B2114 SEAT LIFTER FR
DescriptionINFOID:0000000005147456
• The lifting motor (front) is installed to the power seat frame assembly.
• The lifting motor (front) is activated with the driver seat control unit.
• Tilts the seat front up/down by changing the rotation direction of lifting motor (front).
DTC LogicINFOID:0000000005147457
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1. STEP 1
Turn ignition switch ON.
>> GO TO 2
2. STEP 2
Check “Self diagnostic result” with CONSULT-III.
Is the DTC detected?
YES >> Perform diagnosis procedure. Refer to ADP-34, "DiagnosisProcedure".
NO >> Inspection End.
NOTE:
First perform diagnosis for B2126 if B2126 is detected. Refer to ADP-42, "
DiagnosisProcedure".
Diagnosis ProcedureINFOID:0000000005147458
1. PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Check “Self diagnostic result” with CONSULT-III.
3. Erase the DTC.
4. Perform DTC confirmation procedure. Refer to ADP-34, "
DTC Logic".
Is the DTC displayed again?
YES >> GO TO 2
NO >> Check intermittent incident. Refer to GI-38, "
Intermittent Incident".
2. CHECK COMPONENTS
Refer to ADP-85, "
ComponentFunctionCheck" and ADP-101, "ComponentFunctionCheck".
>> Inspection End.
DTC No. Trouble diagnosis
name DTC detecting condition
Possible cause
B2114 SEAT LIFTER FR The driver seat control unit detects the output of lift-
ing motor (front) output te
rminal for 0.1 second or
more even if the lifting switch is not input. • Driver seat control unit
Revision: April 20092010 QX56

B2115 SEAT LIFTER RRADP-35
< COMPONENT DIAGNOSIS >
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B2115 SEAT LIFTER RR
DescriptionINFOID:0000000005147459
• The lifting motor (rear) is installed to the power seat frame assembly.
• The lifting motor (rear) is activated with the driver seat control unit.
• Tilts the seat rear up/down by changing the rotation direction of lifting motor (rear).
DTC LogicINFOID:0000000005147460
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1. STEP 1
Turn ignition switch ON.
>> GO TO 2
2. STEP 2
Check “Self diagnostic result” with CONSULT-III.
Is the DTC detected?
YES >> Perform diagnosis procedure. Refer to ADP-35, "DiagnosisProcedure".
NO >> Inspection End.
NOTE:
First perform diagnosis for B2126 if B2126 is detected. Refer to ADP-42, "
DiagnosisProcedure".
Diagnosis ProcedureINFOID:0000000005147461
1. PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Check “Self diagnostic result” with CONSULT-III.
3. Erase the DTC.
4. Perform DTC confirmation procedure. Refer to ADP-35, "
DTC Logic".
Is the DTC displayed again?
YES >> GO TO 2
NO >> Check intermittent incident. Refer to GI-38, "
Intermittent Incident".
2. CHECK COMPONENTS
Refer to ADP-87, "
ComponentFunctionCheck" and ADP-103, "ComponentFunctionCheck".
>> Inspection End.
DTC No. Trouble diagnosis
name DTC detecting condition
Possible cause
B2115 SEAT LIFTER RR The driver seat control unit detects the output of lift-
ing motor (rear) output terminal for 0.1 second or
more even if the lifting switch is not input. • Driver seat control unit
Revision: April 20092010 QX56

ADP-42
< COMPONENT DIAGNOSIS >
B2126 DETENT SW
B2126 DETENT SW
DescriptionINFOID:0000000005147471
• Park position switch is installed on A/T shift selector. It is turned OFF when the A/T selector lever is in P
position.
• The driver seat control unit judges that the A/T selector le ver is in P position if continuity does not exist in this
circuit.
DTC LogicINFOID:0000000005147472
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1. STEP 1
Drive the vehicle at 7 ±4km/h or more.
>> GO TO 2
2. STEP 2
Check “Self diagnostic result” with CONSULT-III.
Is the DTC detected?
YES >> Perform diagnosis procedure. Refer to ADP-42, "DiagnosisProcedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000005147473
Regarding Wiring Diagram information, refer to ADP-119, "Wiring Diagram".
1. CHECK DTC
Check “Self diagnostic result” for BCM with CONSULT-lll.
Are other DTCs detected?
YES >> Check the DTC.
NO >> GO TO 2
2. CHECK DETENTION SWITCH SIGNAL
1. Turn ignition switch ON.
2. Select “DETENT SW” in “Data Monitor” mode with CONSULT-lll.
3. Check detention switch signal under the following condition.
Is the status normal?
YES >> A/T shift selector (park position switch) circuit is OK.
DTC No. Trouble diagnosis
name DTC detecting condition
Possible cause
B2126 DETENT SW A/T selector lever is in P position and the vehicle
speed of 7
±4km/h is detected. • Harness and connectors
(Park position switch circuit is
opened/shorted.)
• Park position switch
• Combination meter (CAN communication )
Monitor item ConditionStatus
DETENT SW A/T selector lever P position
OFF
Other than above ON
Revision: April 20092010 QX56

B2126 DETENT SWADP-43
< COMPONENT DIAGNOSIS >
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NO >> GO TO 3
3. CHECK A/T SHIFT SELECTOR (PARK POSITION SWITCH) HARNESS
1. Turn ignition switch OFF.
2. Disconnect A/T shift selector and driver seat control unit.
3. Check continuity between driver seat control unit connector B202 (A) terminal 21 and A/T shif t selector connector M203 (B)
terminal 6.
4. Check continuity between driver seat control unit connector B202 (A) terminal 21 and ground.
Is the inspection result normal?
YES >> GO TO 4
NO >> Repair or replace harness.
4. CHECK PARK POSITION SWITCH
Check continuity between A/T shift selector (park position switch)
terminals as follows.
Is the inspection result normal?
YES >> GO TO 5
NO >> Replace A/T shift selector. Refer to TM-165, "
A/T Shift
Selector Removal and Installation".
5. CHECK INTERMITTENT INCIDENT
Refer to GI-38, "
Intermittent Incident".
Is the inspection result normal?
YES >> Replace driver seat control unit. Refer to ADP-174, "Removal and Installation".
NO >> Repair or replace the malfunctioning part. 6 - 21
: Continuity should exist.
21 - Ground : Continuity should not exist.
ALJIA0194ZZ
TerminalsConditionContinuity
56 P position
Yes
Other than P position No
ALJIA0486ZZ
Revision: April 20092010 QX56

ADP-134
< ECU DIAGNOSIS >
DRIVER SEAT CONTROL UNIT
NOTE:
The front seat LH position and pedal adjustment functions (see the following table) operate simultaneously in
the order of priority.
*: In conjunction with sliding the seat, the door mirrors are positioned.
CANCEL OF FAIL-SAFE MODE
The mode is cancelled when the A/T selector lever is shifted to P position from any other position.
DTC IndexINFOID:0000000005147579
*1:
• 0: Current malfunction is present
• 1-39: Displayed if any previous malfunction is present when current condition is normal. The numeral value increases by one at each
IGN ON to OFF cycle from 1 to 39. The counter remains at 39 even if the number of cycles exceeds it. However, the counter is re set
to 1 if any malfunction is detected again, the normal operation is resumed and the ignition switch is turned from OFF to ON. OPERATED PORTION
T2
Seat sliding Approx. 0.1 sec.
Seat reclining Same as above
Seat lifting (Front) Same as above
Seat lifting (Rear) Same as above
Pedal adjust Same as above
Priority Function PriorityFunction
1 Seat sliding, (door mirro r LH/RH)* 4Seat lifter-FR
2 Pedal 5Seat lifter-RR
3 Seat reclining
CONSULT-III
display Timing
*1
Item
Reference page
Current mal-
function Previous mal-
function
CAN COMM CIRCUIT
[U1000] 0
1-39 CAN communication ADP-31
SEAT SLIDE
[B2112]0
1-39 Seat slide motor output ADP-32
SEAT RECLINING
[B2113]0
1-39 Seat reclin ing motor output ADP-33
SEAT LIFTER FRONT
[B2114] 0
1-39 Seat lifting motor front output ADP-36
SEAT LIFTER REAR
[B2115]0
1-39 Seat lifting motor rear output ADP-36
TILT MOTOR
[B2116]0
1-39 Tilt motor output ADP-105
ADJ PEDAL MOTOR
[B2117]0
1-39 Pedal adjusting motor output ADP-36
TILT SENSOR
[B2118]0
1-39 Tilt sensor input ADP-38
ADJ PEDAL SENSOR
[B2120]0
1-39 Pedal adjusting sensor input ADP-36
DETENT SW
[B2126]0
1-39 Park position switch condition ADP-42
UART COMM
[B2128]0
1-39 UART communication ADP-44
Revision: April 20092010 QX56