ignition INFINITI QX56 2008 Factory Service Manual

PRECAUTIONSSCS-39
< PRECAUTION >
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PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000004900823
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severi ty of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and w hether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SR and SB section of this Service Man-
ual.
WARNING:
• To avoid rendering the SRS inoper ative, which could increase the risk of personal injury or death in
the event of a collision which would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including in correct removal and installation of the SRS, can lead to personal
injury caused by unintentional act ivation of the system. For removal of Spiral Cable and Air Bag
Module, see the SR section.
• Do not use electrical test equipm ent on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identi fied by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
• When working near the Airbag Diagnosis Sensor Un it or other Airbag System sensors with the Igni-
tion ON or engine running, DO NOT use air or el ectric power tools or strike near the sensor(s) with a
hammer. Heavy vibration could activate the sensor( s) and deploy the air bag(s), possibly causing
serious injury.
• When using air or electric power tools or hammers, always switch the Ignition OFF, disconnect the battery, and wait at least 3 minutes before performing any service.
Precaution for Rear SuspensionINFOID:0000000001732010
• When installing the rubber bushings, the final tightening must be done under unladen condition and with thetires on level ground. Oil will shorten the life of the rubber bushings, so wipe off any spilled oil immediately.
• Unladen condition means the fuel tank, engine coolant and lubricants are at the full specification. The spare tire, jack, hand tools, and mats are in their designated positions.
• After installing suspension components, check the wheel alignment.
• Caulking nuts are not reusable. Always use new caulking nuts for installation. New caulking nuts are pre-
oiled, do not apply any additional lubrication.
Revision: March 2010 2008 QX56

SE-6
< FUNCTION DIAGNOSIS >
THIRD ROW POWER FOLDING SEAT
FUNCTION DIAGNOSIS
THIRD ROW POWER FOLDING SEAT
System DescriptionINFOID:0000000001735711
The third row power folding seat system is capable of allowing a user to fold up or down either the left or right
third row seat using a set of front or rear mounted switches.
THIRD ROW POWER FOLDIN G SEAT CONTROL UNIT
The third row power folding seat control unit is located in the control
unit/cross beam assembly underneath the LH third row seat. It
receives signals from the third row power folding seat switches, TCM
and the Hall effect switches mounted in the LH and RH seat motors.
The control unit has self-diagnosis capability through chime codes
and may be accessed by turning the ignition switch ON and OFF
three times. The control unit drives the LH and RH seat motors to
fold them up and down.
THIRD ROW POWER FOLDING SEAT SWITCH
The third row power folding seat switches are located in pairs on the
luggage side finisher RH. A switch must be held in order for the seat
to move.
THIRD ROW POWER FOLDING SEAT MOTORS
The third row power folding seat motors are located in the seat
motor/hinge assembly. There are two motors, one for LH and one
for RH seat folding operations. Power and ground are provided to
the motors by the third row power fo lding seat control unit. The con-
trol unit reverses polarity to the motors to raise or lower the seat.
The motors also contain Hall effe ct switches. These switches send
signals back to the control unit which help it determine fully open and
closed positions.
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Revision: March 2010 2008 QX56

SE-18
< COMPONENT DIAGNOSIS >
THIRD SEAT
THIRD SEAT
Power Supply and Ground Circuit Check for Third Row Power Folding Seat Control
Unit
INFOID:0000000001735718
1.CHECK FUSES AND FUSIBLE LINK
Check for blown fuses or fusible link.
Are any fuses or fusible links blown?
YES >> Install new fuse. Eliminate cause of malfunction if fuse blows again.
NO >> GO TO 2
2.POWER SUPPLY CIRCUIT CHECK
1. Disconnect third row power folding seat control unit connectors B401 and B402.
2. Check voltage between third row power folding seat control unit harness connectors B401, B402 terminals 1, 8, 13, 14 and
ground.
Are the inspection results normal?
YES >> GO TO 3
NO >> Check harness for open between third row power folding seat control unit and fuse or fusible link.
3.GROUND CIRCUIT CHECK
1. Turn ignition switch OFF.
2. Check continuity between third row power folding seat control unit harness connector B402 terminals 16, 18, 21 and ground.
Do all terminals have ground?
YES >> Inspection End.
NO >> Check harness for ground.
Unit Power source Fuse or Fusible Link Location
Third row power folding seat control unit Battery
F
Fuse and fusible link box
19 Fuse block (J/B)
Ignition switch ON or START 14
TerminalsIgnition switch position
(+) (–) OFF ON START
Connector Terminal
A: B401 1
Ground Battery
voltage
80 VBattery
voltage
B: B402 13
Battery
voltage
14 Battery
voltage
ALJIA0274ZZ
Te r m i n a l s
Continuity
(+)
(–)
Connector Terminal
B402 16
Ground Yes
18
21
ALJIA0275ZZ
Revision: March 2010 2008 QX56

THIRD SEATSE-19
< COMPONENT DIAGNOSIS >
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Third Row Power Folding Seat SwitchINFOID:0000000001735719
1.CHECK THIRD ROW POWER FOLD ING SEAT SWITCH OPERATION
1. Turn ignition switch OFF.
2. Disconnect third row power folding seat switch.
3. Check continuity between third row power folding seat switch terminals 2, 3 and 4.
Do you have continuity?
YES >> Inspection End.
NO >> Replace third row power folding seat switch.
Third Row Power Folding Seat MotorINFOID:0000000001735720
1.CHECK MOTOR OPERATION
1. Turn ignition switch OFF.
2. Disconnect third row power folding seat motor connector B403 or B426.
3. Check operation by applying battery voltage to motor terminals 3 and 4.
CAUTION:
• Do not operate motor for more than 3 seconds.
• Be careful not to overheat the harness.
• Third row power folding seat control unit may have to
relearn fold up/down positions after testing.
Does the motor rotate in both directions?
YES >> GO TO 2.
NO >> Replace third row power seat motor. Refer to SE-60, "
Exploded View".
2.CHECK RESISTANCE IN MOTOR
Terminals Condition Continuity
2 4 Press switch button to fold up. Yes
3 4 Press switch button to fold down. Yes
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LH (60%) seat
Terminal MotorSeat
3 (Battery positive) - 4 (Battery negative) Rotates counter-clockwise Up
4 (Battery positive) - 3 (Battery negative) Rotates clockwise Down
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RH (40%) seat
Terminal MotorSeat
3 (Battery positive) - 4 (Battery negative) Rotates counter-clockwise Down
4 (Battery positive) - 3 (Battery negative) Rotates clockwise Up
Revision: March 2010 2008 QX56

THIRD ROW POWER FOLDING SEAT CONTROL UNITSE-21
< ECU DIAGNOSIS >
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ECU DIAGNOSIS
THIRD ROW POWER FOLD ING SEAT CONTROL UNIT
Reference ValueINFOID:0000000001735721
TERMINAL LAYOUT
PHYSICAL VALUES
ALJIA0277ZZ
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Wire
color Description
ConditionVoltage (V)
(Approx.)
+ - Signal nameInput/
Output
1 Ground Y/R Battery Input— Battery voltage
3Ground LG 40% seat switch signal
(down) OutputPush either third row power fold-
ing seat switch passenger (down) 0
Third row power folding seat switch passenger released Battery voltage
4Ground V 60% seat switch signal
(down) OutputPush either third row power fold-
ing seat switch driver (down) 0
Third row power folding seat switch driver released Battery voltage
7 Ground G/R Park signal InputA/T selector lever in P or N
Battery voltage
A/T selector lever not in P or N 0
8 Ground O/L Ignition signal InputIgnition switch ON or START
Battery voltage
Ignition switch OFF 0
9 Ground G/B 40% seat Hall signal Input —9V
10 Ground O/B 60% seat Hall signal Input —9V
11 Ground SB 40% seat switch signal (up) Output Push either third row power fold-
ing seat switch passenger (up) 0
Third row power folding seat switch passenger released Battery voltage
12 Ground O 60% seat switch signal (up) Output Push either third row power fold-
ing seat switch driver (up) 0
Third row power folding seat switch driver released Battery voltage
13 Ground W Battery Input— Battery voltage
14 Ground W Battery Input— Battery voltage
15 Ground Y/B Hall switch ground —— —
16 Ground B Switch ground —— —
17 Ground W/L 60% Seat motor Output— Battery voltage
18 Ground B Ground —— —
19 Ground R/W 60% Seat motor Output— Battery voltage
Revision: March 2010 2008 QX56

SE-28
< ECU DIAGNOSIS >
THIRD ROW POWER FOLDING SEAT CONTROL UNIT
DTC Index
INFOID:0000000001735723
NOTE:
To initiate a chime code sequence cycle, turn the ignition switch ON and OFF 3 times within 5 seconds. The
first digit will chime, then a pause, followed by the second digit. For example, a code 13 will have 1 chime, fol-
lowed by a pause, and then 3 chimes. The third row pow er folding seat control unit will clear all codes that
have been corrected after 255 ignition cycles.
ALJIA0094GB
Revision: March 2010 2008 QX56

THIRD ROW POWER FOLDING SEAT CONTROL UNITSE-29
< ECU DIAGNOSIS >
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Fail SafeINFOID:0000000001735724
The third row power folding seat will not operate under the following conditions:
• Power supply to the third row power folding seat control unit falls below 9.0V
• One of the third row power folding seat switches is stuck closed
• The A/T selector lever is not in PARK position and the ignition switch is ON
DTCMalfunction Service Procedure
11 LH seat has traveled past normal fold
down position 1. Perform Preliminary Check. Refer to
SE-5, "
Preliminary
Check".
2. Check third row power folding seat motor LH Hall signal and ground circuits. Refer to SE-35, "
Third Row Power
Folding Seat Stops Short of its Fully Up or Down Posi-
tion".
3. Replace third row power folding seat motor LH. Refer to SE-60, "
Exploded View".
12
LH seat has traveled past normal fold up
position
13 LH seat actuation cycle has taken too
long and timed out 1. Perform Preliminary Check. Refer to
SE-5, "
Preliminary
Check".
2. Check third row power foldin g seat motor LH motor cir-
cuits. Refer to SE-32, "
Only One Third Row Power Fold-
ing Seat Will Operate".
3. Replace third row power folding seat motor LH. Refer to SE-60, "
Exploded View".
14 Third row power folding seat control unit
NVRAM data for LH seat position has
been corrupted Replace third row power folding seat control unit. Refer to
SE-
63, "Power seat cross beam".
15 Power supply to third row power folding
seat control unit has been interrupted
during LH seat fold up/down cycle 1. Perform Preliminary Check. Refer to
SE-5, "
Preliminary
Check".
2. Replace third row power folding seat control unit. Refer to SE-63, "
Power seat cross beam".
21 RH seat has traveled past normal fold
down position 1. Perform Preliminary Check. Refer to
SE-5, "
Preliminary
Check".
2. Check third row power foldin g seat motor RH Hall signal
and ground circuits. Refer to SE-35, "
Third Row Power
Folding Seat Stops Short of its Fully Up or Down Posi-
tion".
3. Replace third row power folding seat motor RH. Refer to SE-60, "
Exploded View".
22
RH seat has traveled past normal fold up
position
23 RH seat actuation cycle has taken too
long and timed out 1. Perform Preliminary Check. Refer to
SE-5, "
Preliminary
Check".
2. Check third row power fold ing seat motor RH motor cir-
cuits. Refer to SE-32, "
Only One Third Row Power Fold-
ing Seat Will Operate".
3. Replace third row power folding seat motor RH. Refer to SE-60, "
Exploded View".
24 Third row power folding seat control unit
NVRAM data for RH seat position has
been corrupted Replace third row power folding seat control unit. Refer to
SE-
63, "Power seat cross beam".
25 Power supply to third row power folding
seat control unit has been interrupted
during RH seat fold up/down cycle 1. Perform Preliminary Check. Refer to
SE-5, "
Preliminary
Check".
2. Replace third row power folding seat control unit. Refer
to SE-63, "
Power seat cross beam".
33 System normal or END of chime codes —
Revision: March 2010 2008 QX56

NONE OF THE THIRD ROW POWER FOLDING SEATS WILL OPERATE WITH
ANY SWITCH.
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< SYMPTOM DIAGNOSIS >
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NONE OF THE THIRD ROW POWER FOLDING SEATS WILL OPERATE
WITH ANY SWITCH.
None of the Third Row Power Folding Seats Will Operate With Any Third Row Power
Folding Seat Switch
INFOID:0000000001735726
1.PRELIMINARY CHECK
Perform preliminary check. Refer to SE-5, "
Preliminary Check".
Are inspection results normal?
YES >> GO TO 2.
NO >> Perform repairs as necessary.
2.THIRD ROW POWER FOLDING SEAT SWITCH GROUND
1. Turn ignition switch OFF.
2. Disconnect any third row power folding seat switch connector.
3. Check continuity between third row power folding seat switch harness connector terminal 4 and ground.
Is there continuity?
YES >> GO TO 3.
NO >> Repair ground circuit.
3.TRANSMISSION RANGE SWITCH SIGNAL
1. Confirm A/T selector lever is in PARK position.
2. Turn ignition switch ON.
3. Check voltage between third row power folding seat control unit harness connector B401 terminal 7 and ground.
Is there battery voltage?
YES >> Replace third row power folding seat control unit. Refer to SE-63, "Power seat cross beam".
NO >> Repair circuit as necessary.
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Terminals Ignition switch
(+)
(-)ON
Third row power
folding seat
control unit Te r m i n a l N o .
B401 7Ground Battery voltage
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Revision: March 2010 2008 QX56

SE-32
< SYMPTOM DIAGNOSIS >
ONLY ONE THIRD ROW POWER FOLDING SEAT WILL OPERATE.
ONLY ONE THIRD ROW POWER FOLDING SEAT WILL OPERATE.
Only One Third Row Power Folding Seat Will OperateINFOID:0000000001735727
1.PRELIMINARY CHECK
Perform preliminary check. Refer to SE-5, "
Preliminary Check".
Are inspection results normal?
YES >> GO TO 2.
NO >> Perform repairs as necessary.
2.THIRD ROW POWER FOLDING SEAT
Determine which seat is malfunctioning.
Is the affected seat the LH (60%) side?
YES >> GO TO 3.
NO >> GO TO 4.
3.THIRD ROW POWER FOLDING SEAT SWITCH (DRIVER)
1. Turn ignition switch OFF.
2. Disconnect either the front or rear third row power folding seat switch driver side connector.
3. Check continuity between the third row power folding seat
switch driver side harness connector B164 or B165 terminal 4
and ground.
4. Check continuity between any third row power folding seat switch driver side harness connector B164 or B165 terminal 2, 3
and third row power folding seat control unit harness connector
B401 terminals 4, 12.
Are inspection results normal?
YES >> GO TO 5.
NO >> Repair circuits as necessary.
4.THIRD ROW POWER FOLDING SEAT SWITCH (PASSENGER)
1. Turn ignition switch OFF.
2. Disconnect either the front or rear third row power folding seat switch passenger side connector.
Te r m i n a l s
Continuity
(+)
(-)
Third row power
folding seat
switch driver side Te r m i n a l N o .
B164 or B165 4Ground Yes
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Terminals Continuity
AB
Connector Terminal Connector Terminal
B401 4
B164 or B165 3
Ye s
12 2
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Revision: March 2010 2008 QX56

SE-34
< SYMPTOM DIAGNOSIS >
THIRD ROW POWER FOLDING SEAT WILL OPERATE IN ONLY ONE DIREC-
TION.
THIRD ROW POWER FOLDING SEAT WILL OPERATE IN ONLY ONE DI-
RECTION.
Third Row Power Folding Seat Will Operate in Only One DirectionINFOID:0000000001735728
1.PRELIMINARY CHECK
Perform preliminary check. Refer to SE-5, "
Preliminary Check".
Are inspection results normal?
YES >> GO TO 2.
NO >> Perform repairs as necessary.
2.THIRD ROW POWER FOLDING SEAT
Determine which seat is malfunctioning.
Is the affected seat the LH (60%) side?
YES >> GO TO 3.
NO >> GO TO 4.
3.THIRD ROW POWER FOLDING SEAT SWITCH (DRIVER)
1. Turn ignition switch OFF.
2. Disconnect any third row power foldi ng seat switch driver side connector.
3. Check continuity between third row power folding seat switch
driver side harness connector B164 or B165 terminal 2, 3 and
third row power folding seat control unit harness connector B401
terminals 4, 12.
Is there continuity?
YES >> Replace third row power folding seat control unit. Refer to SE-63, "Power seat cross beam".
NO >> Repair circuits as necessary.
4.THIRD ROW POWER FOLDING SEAT SWITCH (PASSENGER)
1. Turn ignition switch OFF.
2. Disconnect either the front or rear third row power folding seat switch passenger side connector.
3. Check continuity between third row power folding seat switch
passenger side harness connector B162 or B163 terminals 2, 3
and third row power folding seat control unit harness connector
B401 terminals 3, 11.
Is there continuity?
YES >> Replace third row power folding seat control unit. Refer to SE-63, "Power seat cross beam"
NO >> Repair circuits as necessary.
TerminalsContinuity
AB
Connector Terminal Connector Terminal
B401 4
B164 or B165 3
Ye s
12 2
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Terminals Continuity
AB
Connector Terminal Connector Terminal
B401 3
B162 or B163 3
Ye s
11 2
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Revision: March 2010 2008 QX56