2008 INFINITI QX56 Seat

B2126 DETENT SWADP-41
< COMPONENT DIAGNOSIS >
C
DE
F
G H
I
K L
M A
B
ADP
N
O P
1. Turn ignition switch OFF.
2. Disconnect driver seat control unit and A/T shift selector.
3. Check continuity between driver seat control unit harness con- nector (A) and A/T shift selector harness connector (B).
4. Check continuity between driver seat control unit harness con- nector (A) 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-195, "
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.
NO >> Repair or replace the malfunctioning part.
AB Continuity
Connector Terminal Connector Terminal
B202 21 M203 6Yes
A —Contin u it y
Connector Terminal
B202 21 Ground No
ALJIA0194ZZ
TerminalsConditionContinuity
56 P position
Yes
Other than P position No
ALJIA0551ZZ
Revision: March 2010 2008 QX56

ADP-42
< COMPONENT DIAGNOSIS >
B2128 UART COMMUNICATION LINE
B2128 UART COMMUNICATION LINE
DescriptionINFOID:0000000001735458
Driver seat control unit performs UART communication with the automatic drive positioner control unit using 2
communication lines, TX and RX line. Driver seat cont rol unit receives the operation signals of pedal adjusting
switch, door mirror remote control switch, set switch and memory switch and the position signals of adjustable
pedal sensor and door mirror sensor from the automatic drive positioner control unit and transmits the opera-
tion request signal.
DTC LogicINFOID:0000000001735459
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1. STEP 1
Turn ignition switch ON.
>> GO TO 2
2. STEP 2
Operate pedal adjusting switch for more than 2 seconds.
>> GO TO 3
3. PROCEDURE 3
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:0000000001735460
1. CHECK UART COMMUNICA TION LINE CONTINUITY
1. Turn ignition switch OFF.
2. Disconnect driver seat contro l unit and automatic drive posi-
tioner control unit.
3. Check continuity between driver seat control unit harness con- nector and automatic drive positioner control unit harness con-
nector.
4. Check continuity between driver seat control unit harness connector and ground.
DTC No. Trouble diagnosis name DTC detecting conditionPossible cause
B2128 UART COMM The communication between driver seat control unit
and automatic drive positioner control unit is interrupt-
ed for a period of time. • UART communication line
(UART communication line is
open or shorted)
• Driver seat control unit
• Automatic drive positioner control unit
Driver seat control unit connector Te r m i n a lAutomatic drive positioner
control unit connector Terminal Continuity
B202 1
M33 10
Ye s
17 26
PIIA4598E
Revision: March 2010 2008 QX56

B2128 UART COMMUNICATION LINEADP-43
< COMPONENT DIAGNOSIS >
C
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F
G H
I
K L
M A
B
ADP
N
O P
Is the inspection result normal?
YES >> Check intermittent incident. Refer to GI-38, "Intermittent Incident".
NO >> Repair or replace harness.
Driver seat control unit con-
nector Te r m i n a l
GroundContinuity
B202 1
No
17
Revision: March 2010 2008 QX56

ADP-44
< COMPONENT DIAGNOSIS >
POWER SUPPLY AND GROUND CIRCUIT
POWER SUPPLY AND GROUND CIRCUIT
BCM
BCM : Diagnosis ProcedureINFOID:0000000001735461
Refer to BCS-32, "Diagnosis Procedure".
BCM : Special Repair RequirementINFOID:0000000001735462
1. REQUIRED WORK WHEN REPLACING BCM
Initialize control unit. Refer to CONSULT-III Operation Manual.
>> Work end.
DRIVER SEAT CONTROL UNIT
DRIVER SEAT CONTROL UN IT : Diagnosis ProcedureINFOID:0000000001735463
NOTE:
Do not disconnect the battery negative terminal and the driver seat control unit connector until DTC is con-
firmed with CONSULT-III.
1. CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Check voltage between driver seat control unit harness connec- tor and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Check the following. • Repair or replace harness between driver seat control unit and fuse block (J/B).
• Circuit breaker.
2. CHECK GROUND CIRCUIT
Check continuity between the driver seat control unit harness con-
nector and ground.
Is the inspection result normal?
YES >> Driver seat control unit power supply and ground circuit are OK.
NO >> Repair or replace harness.
Te r m i n a l s
Power
source ConditionVoltage (V)
(Approx.)
(+)
(–)
Driver seat
control unit connector Te r m i n a l
B202 6
Ground START
power sup-
ply Ignition
switch
START Battery
voltage
B203 33
Battery
power sup- ply Ignition
switch OFF
40
LIIA1897E
Driver seat control unit
connector Te r m i n a l
Ground Continuity
B202 32
Ye s
B203 48
PIIA4542E
Revision: March 2010 2008 QX56

POWER SUPPLY AND GROUND CIRCUITADP-45
< COMPONENT DIAGNOSIS >
C
DE
F
G H
I
K L
M A
B
ADP
N
O P
DRIVER SEAT CONTROL UNIT : Special Repair RequirementINFOID:0000000001735464
1.PERFORM ADDITIONAL SERVICE
Perform additional service when removing battery negative terminal.
>> Refer to Owner’s Manual.
AUTOMATIC DRIVE POSITIONER CONTROL UNIT
AUTOMATIC DRIVE POSITIONER CO NTROL UNIT : Diagnosis Procedure
INFOID:0000000001735465
NOTE:
Do not disconnect the battery negative terminal and the dr iver seat control unit connector until DTC is con-
firmed with CONSULT-III.
1.CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Check voltage between automatic drive positioner control unit
harness connector and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace harness.
2.CHECK GROUND CIRCUIT
Check continuity between the automatic drive positioner control unit
harness connector and ground.
Is the inspection result normal?
YES >> Automatic drive positioner control unit power supply and ground circuit are OK.
NO >> Repair or replace harness.
AUTOMATIC DRIVE POSITIONER CONTRO L UNIT : Special Repair Requirement
INFOID:0000000001735466
1.PERFORM ADDITIONAL SERVICE
Perform additional service when removing battery negative terminal.
>> Refer to Owner’s Manual.
Te r m i n a l s Voltage (V)(Approx.)
(+)
(–)
Automatic drive positioner
control unit connector Te r m i n a l
M33 34
Ground Battery voltage
39
PIIA4543E
Automatic drive positioner
control unit connector Te r m i n a l
GroundContinuity
M33 40
Ye s
48
PIIA4544E
Revision: March 2010 2008 QX56

ADP-46
< COMPONENT DIAGNOSIS >
SLIDING SWITCH
SLIDING SWITCH
DescriptionINFOID:0000000001735467
Sliding switch is equipped to the power seat switch LH on the seat cushion side surface. The operation signal
is input to the driver seat control unit when the sliding switch is operated.
Component Function CheckINFOID:0000000001735468
1. CHECK FUNCTION
1. Select “SLIDE SW-FR”, “SLIDE SW-RR” in “Data monitor” mode with CONSULT-III.
2. Check sliding switch signal under the following conditions.
Is the indication normal?
YES >> INSPECTION END
NO >> Perform diagnosis procedure. Refer to ADP-46, "
DiagnosisProcedure".
Diagnosis ProcedureINFOID:0000000001735469
1. CHECK SLIDING SWITCH SIGNAL
1. Turn ignition switch ON.
2. Check voltage between driver seat control unit harness connec- tor and ground.
Is the inspection result normal?
YES >> GO TO 5
NO >> GO TO 2
2. CHECK SLIDING SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect driver seat control unit and power seat switch LH.
3. Check continuity between driver seat control unit harness con- nector and power seat switch LH harness connector.
Monitor item ConditionStatus
SLIDE SW-FR Sliding switch (forward) Operate
ON
Release OFF
SLIDE SW-RR Sliding switch (backward) Operate
ON
Release OFF
Driver seat control
unit connector Te r m i n a l s
ConditionVoltage (V)
(Approx.)
(+) (–)
B202 11
Ground Sliding
switch Operate
(backward) 0
Release Battery
voltage
26 Operate
(forward) 0
Release Battery
voltage
PIIA4577E
Driver seat control unit connector Te r m i n a lPower seat switch
LH connector Terminal Continuity
B202 11
B208 7
Ye s
26 1
LIIA1125E
Revision: March 2010 2008 QX56

SLIDING SWITCHADP-47
< COMPONENT DIAGNOSIS >
C
DE
F
G H
I
K L
M A
B
ADP
N
O P
4. Check continuity between driver seat control unit harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3
NO >> Repair or replace harness.
3. CHECK DRIVER SEAT CONTROL UNIT OUTPUT
1. Connect the driver seat control unit.
2. Turn ignition switch ON.
3. Check voltage between driver s eat control unit harness connec-
tor and ground.
Is the inspection result normal?
YES >> GO TO 4
NO >> Replace driver seat control unit.
4. CHECK SLIDING SWITCH
Refer to ADP-47, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 5
NO >> Replace power seat switch LH.
5. CHECK INTERMITTENT INCIDENT
Refer to GI-38, "
Intermittent Incident".
Is the inspection result normal?
YES >> Replace driver seat control unit.
NO >> Repair or replace malfunctioning part.
Component InspectionINFOID:0000000001735470
1. CHECK SLIDING SWITCH
1. Turn ignition switch OFF.
2. Disconnect power seat switch LH.
3. Check continuity between power seat switch LH terminals.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace power seat switch LH.
Driver seat control unit connector Te r m i n a l
GroundContinuity
B202 11
No
26
Driver seat control unit
connector Te r m i n a l s
Voltage (V)
(Approx.)
(+) (–)
B202 11
Ground Battery voltage
26
PIIA4577E
Te r m i n a l Condition Continuity
Power seat switch LH
3 7 Sliding switch (backward)
Operate
Yes
Release No
1 Sliding switch (forward) Operate
Yes
Release No
LIIA1126E
Revision: March 2010 2008 QX56

ADP-48
< COMPONENT DIAGNOSIS >
RECLINING SWITCH
RECLINING SWITCH
DescriptionINFOID:0000000001735471
Reclining switch is equipped to the power seat switch LH on the seat cushion side surface. The operation sig-
nal is input to the driver seat control unit when the reclining switch is operated.
Component Function CheckINFOID:0000000001735472
1.CHECK FUNCTION
1. Select “RECLN SW-FR”, “RECLN SW-RR” in “Data monitor” mode with CONSULT-III.
2. Check reclining switch signal under the following conditions.
Is the indication normal?
YES >> INSPECTION END
NO >> Perform diagnosis procedure. Refer to ADP-48, "
DiagnosisProcedure".
Diagnosis ProcedureINFOID:0000000001735473
1. CHECK RECLINING SWITCH SIGNAL
1. Turn ignition switch ON.
2. Check voltage between driver seat control unit harness connec- tor and ground.
Is the inspection result normal?
YES >> GO TO 5
NO >> GO TO 2
2. CHECK RECLINING SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect driver seat control unit and power seat switch LH.
3. Check continuity between driver seat control unit harness con- nector and power seat switch LH harness connector.
4. Check continuity between driver seat control unit harness con- nector and ground.
Monitor item ConditionStatus
RECLN SW-FR Reclining switch (forward) Operate
ON
Release OFF
RECLN SW-RR Reclining switch (backward) Operate
ON
Release OFF
Driver seat
control unit
connector Te r m i n a l s
ConditionVoltage (V)
(Approx.)
(+) (–)
B202 12
Ground Reclining
switch Operate
(forward) 0
Release Battery voltage
27 Operate
(backward) 0
Release Battery voltage
PIIA4580E
Driver seat control unit connector Te r m i n a lPower seat switch
LH connector Terminal Continuity
B202 12
B208 9
Ye s
27 10
LIIA1127E
Revision: March 2010 2008 QX56