INFINITI QX56 2009 Factory Repair Manual

POWER SUPPLY AND GROUND CIRCUITADP-47
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DRIVER SEAT CONTROL UNIT : Diagnosis ProcedureINFOID:0000000003775549
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. Disconeect driver seat control unit.
3. Check voltage between driver s eat 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 driv er 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.
DRIVER SEAT CONTROL UNIT : Special Repair RequirementINFOID:0000000003775550
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:0000000003775551
NOTE:
Do not disconnect the battery negative terminal and the dr iver seat control unit connector until DTC is con-
firmed with CONSULT-III.
Te r m i n a l s
Power
source ConditionVoltage (V)
(Approx.)
(+)
(–)
Driver seat
control unit connector Terminal
B202 6 GroundSTART
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: December 20092009 QX56

ADP-48
< COMPONENT DIAGNOSIS >
POWER SUPPLY AND GROUND CIRCUIT
1. CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect automatic drive positioner control unit.
3. 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 automat ic 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 CONTROL UNIT : Special Repair Requirement
INFOID:0000000003775552
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
M34 34
Ground Battery voltage
39
PIIA4543E
Automatic drive positioner
control unit connector Te r m i n a l
GroundContinuity
M34 40
Ye s
48
PIIA4544E
Revision: December 20092009 QX56

SLIDING SWITCHADP-49
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SLIDING SWITCH
DescriptionINFOID:0000000003775553
Sliding switch is equipped to the power seat switch LH on the seat cushion trim cover. The operation signal is
input to the driver seat control unit when the sliding switch is operated.
Component Function CheckINFOID:0000000003775554
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-49, "Diagnosis Procedure"
.
Diagnosis ProcedureINFOID:0000000003775555
1. CHECK SLIDING SWITCH SIGNAL
1. Turn ignition switch OFF.
2. Check voltage between driver s eat 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. Disconnect driver seat control unit and power seat switch LH.
2. Check continuity between driver seat control unit harness con-
nector and power seat switch LH harness connector.
3. Check continuity between driver seat control unit harness con-
nector and ground.
Monitor item Condition Status
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 l
Power seat switch
LH connector Terminal Continuity
B202 (A) 11
B208 (B) 1
Ye s
26 5
ALJIA0308ZZ
Revision: December 20092009 QX56

ADP-50
< COMPONENT DIAGNOSIS >
SLIDING SWITCH
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 seat control unit harness connec- tor and ground.
Is the inspection result normal?
YES >> GO TO 4
NO >> Replace driver seat control unit. Refer to ADP-165, "Removal and Installation"
.
4. CHECK SLIDING SWITCH
Refer to ADP-50, "Component Inspection"
.
Is the inspection result normal?
YES >> GO TO 5
NO >> Replace power seat switch LH. Refer to SE-68, "Disassembly and Assembly"
.
5. CHECK INTERMITTENT INCIDENT
Refer to GI-38, "Intermittent Incident"
.
Is the inspection result normal?
YES >> Replace driver seat control unit. Refer to ADP-165, "Removal and Installation".
NO >> Repair or replace malfunctioning part.
Component InspectionINFOID:0000000003775556
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. Refer to SE-68, "Disassembly and Assembly"
.
Driver seat control unit
connector Terminal
GroundContinuity
B202 (A) 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
7 1 Sliding switch (backward)
Operate Yes
Release No
5 Sliding switch (forward) Operate Yes
Release No
ALJIA0309ZZ
Revision: December 20092009 QX56

RECLINING SWITCHADP-51
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RECLINING SWITCH
DescriptionINFOID:0000000003775557
Reclining switch is equipped to the power seat switch LH on the seat cushion trim cover. The operation signal
is input to the driver seat control unit when the reclining switch is operated.
Component Function CheckINFOID:0000000003775558
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-51, "Diagnosis Procedure"
.
Diagnosis ProcedureINFOID:0000000003775559
1. CHECK RECLINING SWITCH SIGNAL
1. Turn ignition switch OFF.
2. Check voltage between driver s eat 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. Disconnect driver seat control unit and power seat switch LH.
2. Check continuity between driver seat control unit harness con-
nector and power seat switch LH harness connector.
3. Check continuity between driver seat control unit harness con-
nector and ground.
Monitor item Condition Status
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
(backward) 0
Release Battery voltage
27 Operate
(forward) 0
Release Battery voltage
PIIA4580E
Driver seat control unit connector Te r m i n a l
Power seat switch
LH connector Terminal Continuity
B202 (A) 12
B208 (B) 9
Ye s
27 10
ALJIA0310ZZ
Revision: December 20092009 QX56

ADP-52
< COMPONENT DIAGNOSIS >
RECLINING SWITCH
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 OFF.
3. Check voltage between driver seat control unit harness connec- tor and ground.
Is the inspection result normal?
YES >> GO TO 4
NO >> Replace driver seat control unit. Refer to ADP-165, "Removal and Installation"
.
4. CHECK RECLINING SWITCH
Refer to ADP-52, "Component Inspection"
.
Is the inspection result normal?
YES >> GO TO 5
NO >> Replace power seat switch LH. Refer to SE-68, "Disassembly and Assembly"
.
5. CHECK INTERMITTENT INCIDENT
Refer to GI-38, "Intermittent Incident"
.
Is the inspection result normal?
YES >> Replace driver seat control unit. Refer to ADP-165, "Removal and Installation".
NO >> Repair or replace the malfunctioning part.
Component InspectionINFOID:0000000003775560
1. CHECK RECLINING 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. Refer to SE-68, "Disassembly and Assembly"
.
Driver seat control unit
connector Terminal
GroundContinuity
B202 (A) 12
No
27
Driver seat control
unit connector Te r m i n a l s
Voltage (V)
(Approx.)
(+) (–)
B202 12
Ground Battery voltage
27
PIIA4580E
Te r m i n a l s Condition Continuity
Power seat switch LH
7 3
Reclining switch
(backward) Operate Yes
Release No
4 Reclining switch
(forward) Operate Yes
Release No
ALJIA0311ZZ
Revision: December 20092009 QX56

LIFTING SWITCH (FRONT)ADP-53
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LIFTING SWITCH (FRONT)
DescriptionINFOID:0000000003775561
Lifting switch (front) is equipped to the power seat swit ch LH on the seat cushion trim cover. The operation sig-
nal is input to the driver seat control unit when the lifting switch (front) is operated.
Component Function CheckINFOID:0000000003775562
1. CHECK FUNCTION
1. Select “LIFT FR SW-UP”, “LIFT FR SW-DN” in “DATA MONITOR” mode with CONSULT-III.
2. Check lifting switch (front) signal under the following conditions.
Is the indication normal?
YES >> Inspection End.
NO >> Perform diagnosis procedure. Refer to ADP-53, "Diagnosis Procedure"
.
Diagnosis ProcedureINFOID:0000000003775563
1. CHECK LIFTING SWITCH SIGNAL
1. Turn ignition switch OFF.
2. Check voltage between driver s eat control unit harness connec-
tor and ground.
Is the inspection result normal?
YES >> GO TO 5
NO >> GO TO 2
2. CHECK LIFTING SWITCH (FRONT) CIRCUIT
1. Disconnect driver seat control unit and power seat switch LH.
2. Check continuity between driver seat control unit harness con-
nector and power seat switch LH harness connector.
3. Check continuity between driver seat control unit harness con-
nector and ground.
Monitor item Condition Status
LIFT FR SW-UP Lifting switch front (up) Operate ON
Release OFF
LIFT FR SW-DN Lifting switch front (down) Operate ON
Release OFF
Driver seat
control unit
connector Te r m i n a l s
ConditionVoltage (V)
(Approx.)
(+) (–)
B202 13
Ground Lifting
switch (front) Operate
(down) 0V
Release Battery
voltage
28 Operate (up) 0V
Release Battery
voltage
PIIA4583E
Driver seat control unit connector Te r m i n a lPower seat switch
LH connector Terminal Continuity
B202 (A) 13
B208 (B) 9
Ye s
28 10
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Revision: December 20092009 QX56

ADP-54
< COMPONENT DIAGNOSIS >
LIFTING SWITCH (FRONT)
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 OFF.
3. Check voltage between driver seat control unit harness connec- tor and ground.
Is the inspection result normal?
YES >> GO TO 4
NO >> Replace driver seat control unit. Refer to ADP-165, "Removal and Installation"
.
4. CHECK LIFTING SWITCH (FRONT)
Refer to ADP-54, "Component Inspection"
.
Is the inspection result normal?
YES >> GO TO 5
NO >> Replace power seat switch LH. Refer to SE-68, "Disassembly and Assembly"
.
5. CHECK INTERMITTENT INCIDENT
Refer to GI-38, "Intermittent Incident"
.
Is the inspection result normal?
YES >> Replace driver seat control unit. Refer to ADP-165, "Removal and Installation".
NO >> Repair or replace the malfunctioning part.
Component InspectionINFOID:0000000003775564
1. CHECK LIFTING SWITCH (FRONT)
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. Refer to SE-68, "Disassembly and Assembly"
.
Driver seat control unit
connector Te r m i n a l
GroundContinuity
B202 (A) 13
No
28
Driver seat control unit
connector Te r m i n a l s
Voltage (V)
(Approx.)
(+) (–)
B202 13
Ground Battery voltage
28
PIIA4583E
Te r m i n a l Condition Continuity
Power seat switch LH
7 9 Lifting switch front (down)
Operate Yes
Release No
10 Lifting switch front (up) Operate Yes
Release No
ALJIA0313ZZ
Revision: December 20092009 QX56

LIFTING SWITCH (REAR)ADP-55
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LIFTING SWITCH (REAR)
DescriptionINFOID:0000000003775565
Lifting switch (rear) is equipped to the power seat switch LH on the seat cushion trim cover. The operation sig-
nal is inputted to the driver seat control unit when the lifting switch (rear) is operated.
Component Function CheckINFOID:0000000003775566
1. CHECK FUNCTION
1. Select “LIFT RR SW-UP”, “LIFT RR SW-DN” in “Data monitor” mode with CONSULT-III.
2. Check lifting switch (rear) signal under the following conditions.
Is the indication normal?
YES >> Inspection End.
NO >> Perform diagnosis procedure. Refer to ADP-55, "Diagnosis Procedure"
.
Diagnosis ProcedureINFOID:0000000003775567
1. CHECK LIFTING SWITCH (REAR) SIGNAL
1. Turn ignition switch OFF.
2. Check voltage between driver s eat control unit harness connec-
tor and ground.
Is the inspection result normal?
YES >> GO TO 5
NO >> GO TO 2
2. CHECK LIFTING SWITCH (REAR) CIRCUIT
1. Disconnect driver seat control unit and power seat switch LH.
2. Check continuity between driver seat control unit harness con-
nector and power seat switch LH harness connector.
3. Check continuity between driver seat control unit harness con-
nector and ground.
Monitor item Condition Status
LIFT RR SW-UP Lifting switch rear (up) Operate ON
Release OFF
LIFT RR SW-DN Lifting switch rear (down) Operate ON
Release OFF
Driver seat
control unit
connector Te r m i n a l s
ConditionVoltage (V)
(Approx.)
(+) (–)
B202 14
Ground Lifting
switch (rear) Operate (down) 0
Release Battery voltage
29 Operate (up) 0
Release Battery voltage
PIIA4586E
Driver seat control unit connector Te r m i n a lPower sear switch
LH connector Terminal Continuity
B202 (A) 14
B208 (B) 2
Ye s
29 6
ALJIA0314ZZ
Revision: December 20092009 QX56

ADP-56
< COMPONENT DIAGNOSIS >
LIFTING SWITCH (REAR)
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 OFF.
3. Check voltage between driver seat control unit harness connec- tor and ground.
Is the inspection result normal?
YES >> GO TO 4
NO >> Replace driver seat control unit. Refer to ADP-165, "Removal and Installation"
.
4. CHECK LIFTING SWITCH (REAR)
Refer to ADP-56, "Component Inspection"
.
Is the inspection result normal?
YES >> GO TO 5
NO >> Replace power seat switch LH. Refer to SE-68, "Disassembly and Assembly"
.
5. CHECK INTERMITTENT INCIDENT
Refer to GI-38, "Intermittent Incident"
.
Is the inspection result normal?
YES >> Replace driver seat control unit. Refer to ADP-165, "Removal and Installation".
NO >> Repair or replace the malfunctioning part.
Component InspectionINFOID:0000000003775568
1. CHECK LIFTING SWITCH (REAR)
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. Refer to SE-68, "Disassembly and Assembly"
.
Driver seat control unit
connector Terminal
GroundContinuity
B202 (A) 14
No
29
Driver seat control unit
connector Te r m i n a l s
Voltage (V)
(Approx.)
(+) (–)
B202 14
Ground Battery voltage
29
PIIA4586E
Te r m i n a l Condition Continuity
Power seat switch LH
7 2 Lifting switch rear (down)
Operate Yes
Release No
6 Lifting switch rear (up) Operate Yes
Release No
ALJIA0315ZZ
Revision: December 20092009 QX56