200 INFINITI QX56 2009 Factory Workshop Manual

B2118 TILT SENSORADP-39
< COMPONENT DIAGNOSIS >
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1. Turn ignition switch OFF.
2. Check voltage between automatic drive positioner connector
and ground.
Is the inspection result normal?
YES >> Tilt sensor circuit is OK.
NO >> GO TO 3
3. CHECK HARNESS CONTINUITY
1. Disconnect automatic drive positi oner control unit and tilt motor
assembly.
2. Check continuity between autom atic drive positioner connector
M33 (A), M34 (B) terminals 7, 33, 41 and tilt motor assembly
connector M85 (C) terminals 2, 3, 4.
3. Check continuity between automat ic drive positioner control unit
connectors M33 (A), M34 (B ) terminals 7, 33, 41 and ground.
Is the inspection result normal?
YES >> Replace tilt motor assembly. Refer to ST-19, "Removal
and Installation".
NO >> Repair or replace harness.
4. CHECK DOOR MIRROR OPERATION
1. Connect automatic drive positioner c ontrol unit and tilt motor assembly.
2. Turn ignition switch ON.
3. Check door mirror operation with memory function.
Is the operation normal?
YES >> Replace tilt motor assembly. Refer to ST-19, "Removal and Installation".
NO >> GO TO 5
5. CHECK INTERMITTENT INCIDENT
Refer to GI-38, "Intermittent Incident"
.
Is the inspection result normal?
YES >> Replace automatic drive posit ioner control unit. Refer to ADP-166, "Removal and Installation".
NO >> Repair or replace the malfunctioning part.
Connector Te r m i n a l s
ConditionVoltage (V)
(Approx.)
(+) (-)
M33 7 Ground Tilt top position 2
Tilt bottom position 4
LIIA0485E
7 - 3 : Continuity should exist.
33 - 2 : Continuity should exist.
41 - 4 : Continuity should exist.
7 - Ground : Continuity should not exist.
33 - Ground : Continuity should not exist.
41 - Ground : Continuity should not exist.
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Revision: December 20092009 QX56

ADP-40
< COMPONENT DIAGNOSIS >
B2120 ADJ PEDAL SENSOR
B2120 ADJ PEDAL SENSOR
DescriptionINFOID:0000000003775538
 The pedal adjusting sensor is installed in the pedal assembly.
 The resistance of pedal adjusting sensor is changed according to the forward/backward position of pedalassembly.
 The terminal voltage of automatic drive positioner control unit will be changed according to a change of
pedal adjusting sensor resistance. Automatic drive pos itioner control unit calculates the pedal assembly
position from the voltage.
DTC LogicINFOID:0000000003775539
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 is detected?
YES >> Perform diagnosis procedure. Refer to ADP-40, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000003775540
1. CHECK PEDAL ADJUSTING SENSOR SIGNAL
1. Turn ignition switch ON.
2. Select “PEDAL SEN” in “Dat a monitor” mode with CONSULT-III.
3. Check the pedal adjusting sensor signal under the following condition.
Is the value normal?
YES >> Pedal adjusting circuit is OK.
NO >> GO TO 2
2. CHECK PEDAL ADJUSTING SENSO R CIRCUIT HARNESS CONTINUITY
DTC No.Trouble diagnosis
name DTC detecting condition Possible cause
B2120 ADJ PEDAL SENSOR The input voltage of pedal adjusting sensor is 0.5V
or less or 4.5V or higher, for 0.5 seconds or more.  Harness and connectors
(Pedal adjusting sensor circuit is
opened/shorted, pedal adjusting
sensor power supply circuit is
opened/shorted.)
 Pedal adjusting sensor
Monitor item Condition Value
PEDAL SEN Pedal position Forward 0.5V
Backward 4.5V
Revision: December 20092009 QX56

B2120 ADJ PEDAL SENSORADP-41
< COMPONENT DIAGNOSIS >
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1. Disconnect automatic drive positioner control unit and pedal adjusting motor assembly.
2. Check continuity between autom atic drive positioner connector
M33 (A), M34 (C) terminals 8, 33, 41 and pedal adjusting motor
assembly connector E110 (B) terminals 3, 4, 5.
3. Check continuity between automat ic drive positioner control unit
connector M33 (A), M34 (C) terminals 8, 33, 41 and ground.
Is the inspection result normal?
YES >> Replace pedal adjusting motor assembly. Refer to ADP-
169, "Removal and Installation".
NO >> Repair or replace harness. 8 - 4 : Continuity should exist.
33 - 3 : Continuity should exist.
41 - 5 : Continuity should exist.
8 - Ground : Continuity should not exist.
33 - Ground : Continuity should not exist.
41 - Ground : Continuity should not exist.
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Revision: December 20092009 QX56

ADP-42
< COMPONENT DIAGNOSIS >
B2126 DETENT SW
B2126 DETENT SW
DescriptionINFOID:0000000003775541
 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:0000000003775542
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, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000003775543
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.
NO >> GO TO 3
3. CHECK A/T SHIFT SELECTOR (PARK POSITION SWITCH) HARNESS
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 Condition Status
DETENT SW A/T selector lever P position OFF
Other than above ON
Revision: December 20092009 QX56

B2126 DETENT SWADP-43
< COMPONENT DIAGNOSIS >
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1. Turn ignition switch OFF.
2. Disconnect A/T shift selector and driver seat control unit.
3. Check continuity between A/T shift selector connector M203 (B)
terminal 6 and driver seat control unit connector B203 (A) termi-
nal 21.
4. Check continuity between A/T shift selector connector M203 (B) terminal 6 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-196, "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-165, "Removal and Installation".
NO >> Repair or replace the malfunctioning part. 6 - 21 : Continuity should exist.
6 - Ground : Continuity should not exist.
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Terminals Condition Continuity
56 P position Yes
Other than P position No
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Revision: December 20092009 QX56

ADP-44
< COMPONENT DIAGNOSIS >
B2128 UART COMMUNICATION LINE
B2128 UART COMMUNICATION LINE
DescriptionINFOID:0000000003775544
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:0000000003775545
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-44, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000003775546
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 positi oner control unit harness con-
nector.
4. Check continuity between driver seat control unit harness connector and ground.
DTC No. Trouble diagnosis name DTC detecting condition Possible 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: December 20092009 QX56

B2128 UART COMMUNICATION LINEADP-45
< COMPONENT DIAGNOSIS >
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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: December 20092009 QX56

ADP-46
< COMPONENT DIAGNOSIS >
POWER SUPPLY AND GROUND CIRCUIT
POWER SUPPLY AND GROUND CIRCUIT
BCM
BCM : Diagnosis ProcedureINFOID:0000000004055989
1. CHECK FUSES AND FUSIBLE LINK
Check that the following fuses and fusible link are not blown.
Is the fuse blown?
YES >> Replace the blown fuse or fusible link after repairing the affected circuit.
NO >> GO TO 2
2. CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM.
3. Check voltage between BCM 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 BCM harness connector and ground.
Does continuity exist?
YES >> Inspection End.
NO >> Repair or replace harness.
DRIVER SEAT CONTROL UNIT
Terminal No. Signal name Fuses and fusible link No.
57 Battery power supply 22 (15A)
70 F (50A)
11 Ignition ACC or ON 4 (10A)
38 Ignition ON or START 59 (10A)
Connector Te r m i n a l s
Power
source Condition
Voltage (V) (Ap-
prox.)
(+) (-)
M18 11 Ground
ACC
power
supply Ignition
switch
ACC or ON Battery voltage
38 Ground Ignition
power
supply Ignition
switch ON or START Battery voltage
M20 57 Ground
Battery
power
supply Ignition
switch
OFF Battery voltage
70 Ground Battery
power
supply Ignition
switch OFF Battery voltage
LIIA2415E
BCM
GroundContinuity
Connector Terminal
M20 67 Yes
LIIA0915E
Revision: December 20092009 QX56

POWER SUPPLY AND GROUND CIRCUITADP-47
< COMPONENT DIAGNOSIS >
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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