2008 INFINITI QX56 transmission

THIRD ROW POWER FOLDING SEATSE-7
< FUNCTION DIAGNOSIS >
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Component Parts LocationINFOID:0000000001735712
Component DescriptionINFOID:0000000001735713
ALJIA0088ZZ
1. Third row power folding seat control unit B401, B402 2. A/T Assembly F9 3. Third row power folding seat switches
A: Third row power folding seat sw itch passenger side (front) B162
B: Third row power folding seat switch driver side (front) B164
C: Third row power folding seat switch passenger side (rear) B163
D: Third row power folding seat switch driver side (rear) B165
4. Third row power folding seat motors
A: RH (40%) seat B426
B: LH (60%) seat B403
Component Function
Third row power folding seat control unit • Receive inputs from third row power folding seat switches and A/T assembly (trans-
mission range switch)
• Drive third row powe r folding seat motors
• Performs self-diagnostics
A/T assembly Provide transmission range switch signal to third row power folding seat control unit
Third row power folding seat switches Provide fold up/fold down ground signals to third row power folding seat control unit
Third row power folding seat motors • Fold seats up and down
• Provide feedback signals to third row power folding seat control unit
Revision: March 2010
2008 QX56

NONE OF THE THIRD ROW POWER FOLDING SEATS WILL OPERATE WITH
ANY SWITCH.
SE-31
< 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.
ALJIA0116ZZ
Terminals Ignition switch
(+)
(-)ON
Third row power
folding seat
control unit Te r m i n a l N o .
B401 7Ground Battery voltage
ALJIA0278ZZ
Revision: March 2010 2008 QX56

INTELLIGENT KEY SYSTEM/ENGINE START FUNCTIONSEC-9
< FUNCTION DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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FUNCTION DIAGNOSIS
INTELLIGENT KEY SYSTEM /ENGINE START FUNCTION
System DiagramINFOID:0000000001539100
System DescriptionINFOID:0000000001539101
INPUT/OUTPUT SIGNAL CHART
Intelligent Key Unit
IPDM E/R
BCM
SYSTEM DESCRIPTION
• The engine start function of Intelligent Key system is a system that makes it possible to start and stop the
engine without using the key. It verifies the electr onic ID using two-way communications when pressing the
ignition knob switch while carrying the Intelligent Key, which operates based on the results of electronic ID
verification for Intelligent Key using two-way communications between the Intelligent Key and the vehicle.
NOTE:
The driver should carry the Intelligent Key at all times.
Switch/Input signal Input signal to
Intelligent Key unit Intelligent Key unit
function Actuator/Output signal
Key switch Mechanical key
(insert/remove)
Engine start function• KEY warning lamp/buzzer
• Steering lock solenoid
• Starter relay requ
est (to IPDM E/R)
• Inside key antenna
(Front and rear center console, over-
head console, luggage compartment)
• Key interlock solenoid
Ignition knob switch
Ignition knob
(push/release)
Steering lock solenoid Steering lock
(lock/unlock)
Inside key antenna
(Front and rear center console, over-
head console, luggage compartment) Intelligent key
(inside antenna detection
area or not.)
Switch/Input signal Input signal to
IPDM E/R IPDM E/R function
Actuator/Output signal
Transmission range switch P, N range Engine start function• Starter relay
• Starter motor
Switch/Input signal Input signal to
BCM BCM function
Actuator/Output signal
Key switch Brake
(press/release)
Engine start function• Inside key antenna
(Front and rear center console, over-
head console, luggage compartment)
ALKIA0925GB
Revision: March 2010 2008 QX56

SEC-24
< COMPONENT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
U1000 CAN COMM CIRCUIT
COMPONENT DIAGNOSIS
U1000 CAN COMM CIRCUIT
DescriptionINFOID:0000000001539116
CAN (Controller Area Network) is a serial communication
line for real time applications. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Modern
vehicle is equipped with many electronic control unit, and each control unit shares information and links with
other control units during operation (not independent). In CAN communication, control units are connected
with 2 communication lines (CAN-H line, CAN-L line) al lowing a high rate of information transmission with less
wiring. Each control unit transmits/receives data but selectively reads required data only.
CAN Communication Signal Chart, refer to LAN-44, "
CAN Communication Signal Chart".
DTC LogicINFOID:0000000001539117
DTC DETECTION LOGIC
Diagnosis ProcedureINFOID:0000000001539118
1.PERFORM SELF DIAGNOSTIC
1. Turn ignition switch ON and wait for 2 seconds or more.
2. Check “Self Diagnostic Result”.
Is
“CAN COMM CIRCUIT” displayed?
YES >> Refer to LAN-5, "CAN Communication Control Circuit".
NO >> Refer to GI-38, "
Intermittent Incident".
DTCCONSULT-III display
description DTC Detection Condition
Possible cause
U1000 CAN COMM CIRCUIT When Intelligent Key unit cannot communi-
cate CAN communication signal continuous-
ly for 2 seconds or more. In CAN communication system, any item (or items)
of the following listed below is malfunctioning.
•Transmission
• Receiving (BCM)
• Receiving (ECM)
• Receiving (METER/M&A)
Revision: March 2010
2008 QX56

U1010 CONTROL UNIT (CAN)SEC-25
< COMPONENT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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U1010 CONTROL UNIT (CAN)
DescriptionINFOID:0000000001539119
CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-vehicle mul-
tiplex communication line with high data communicati on speed and excellent error detection ability. Modern
vehicle is equipped with many electronic control unit, and each control unit shares information and links with
other control units during operation (not independent). In CAN communication, control units are connected
with 2 communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less
wiring. Each control unit transmits/receives data but selectively reads required data only.
CAN Communication Signal Chart, refer to LAN-44, "
CAN Communication Signal Chart".
DTC LogicINFOID:0000000001539120
DTC DETECTION LOGIC
Diagnosis ProcedureINFOID:0000000001539121
1.REPLACE INTELLIGENT KEY UNIT
When DTC [U1010] is detected, replace Intelligent Key unit.
>> Replace Intelligent Key unit.
Special Repair RequirementINFOID:0000000001539122
1.REQUIRED WORK WHEN REPLACING INTELLIGENT KEY UNIT
Initialize control unit. Refer to CONSULT-III Operation Manual.
>> Work end.
DTC CONSULT-III display de-
scription DTC Detection Condit
ion Possible cause
U1010 CONTROL UNIT (CAN) When detecting error during the initial diagnosis of CAN control-
ler of Intelligent Key unit. Intelligent Key unit
Revision: March 2010
2008 QX56

INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION SYMPTOMS
SEC-111
< SYMPTOM DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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SYMPTOM DIAGNOSIS
INTELLIGENT KEY SYSTEM/ENGIN E START FUNCTION SYMPTOMS
Symptom TableINFOID:0000000001539175
NOTE:
• Before performing the diagnosis in the following table, check “ SEC-3, "
Work Flow"”.
• Check that vehicle is under the condition shown in “Conditions of vehicle” before starting diagnosis, and check each symptom.
• Engine cranking is enabled when the shift lever is in the "Park" position, and in the "Neutral" position only if the brake pedal is depressed.
• If the following symptoms are detec ted, check systems shown in the “Diagnosis/service procedure” column
in this order.
CONDITIONS OF VEHICLE (OPERATING CONDITIONS)
• Engine start function is ON when setting on CONSULT-III.
• Mechanical key is not inserted in key cylinder.
• One or more of Intelligent Keys with registered Intelligent Key ID is in the vehicle.
Symptom Diagnosis/service procedureReference
page
Ignition switch does not turn on with Intelligent Key.
[LCD displays "KEY DETECTED"] 1. Check steering lock solenoid.
DLK-95
2. Replace Intelligent Key unit.SEC-116
Ignition switch does not turn on with Intelligent Key.
[LCD does not display "PUSH" with arrow toward key
cylinder] 1. Check Intelligent Key unit power supply and ground circuit.
DLK-642. Check ignition knob switch.DLK-112
3. Check key switch (BCM input). D L K - 111
4. Check key switch (Intelligent Key unit input).DLK-109
5. Replace Intelligent Key unit.SEC-116
Ignition switch does not turn on with Intelligent Key.
[LCD displays " NO KEY"] 1a. Check inside key antenna 1 (rear of center console).
DLK-56
1b. Check inside key antenna 2 (luggage compartment).DLK-58
1c. Check inside key antenna 3 (front of center console).DLK-60
1d. Check inside key antenna 4 (overhead console area).DLK-64
2. Replace Intelligent Key unit.SEC-116
Ignition switch does not turn on with mechanical key1. Check key switch (BCM input).
D L K - 1112. Check key switch (Intelligent Key unit input).DLK-109
Engine cannot be cranked with transmission in "Park"
or in "Neutral" position with brake pedal depressed.1. Check transmission signal.
TM-43
2. Check stop lamp switch.EXL-81
Revision: March 2010 2008 QX56

SN-6
< FUNCTION DIAGNOSIS >
REAR SONAR SYSTEM
FUNCTION DIAGNOSIS
REAR SONAR SYSTEM
System DiagramINFOID:0000000001754056
System DescriptionINFOID:0000000001754057
FUNCTION
With power and ground supplied, transmission gear selector lever in R position, and the sonar system OFF
switch ON, the rear sonar system will detect obstacles withi n 1.8 m (5.9 ft.) of the rear sonar sensors. The
vehicle operator is notified of obstacles by varied rate of tone from the rear sonar buzzer depending on dis-
tance of obstacle being sensed.
SONAR SYSTEM OFF SWITCH
With power and ground supplied to the sonar control unit, transmission gear selector lever in R position, the
sonar system can be disabled and the rear sonar buzze r silenced by momentarily pressing the sonar system
OFF switch. The sonar system OFF indicator lamp will be illuminated in the sonar system OFF switch.
The rear sonar system and buzzer will be disabled and t he sonar system OFF indicator will be illuminated until
the ignition switch is turned OFF. When the ignition switch is turned ON, the rear sonar system will be
enabled. Depressing the sonar system OFF switch again will enable the rear sonar system also. Enabling the
rear sonar system will cause the rear sonar system OFF i ndicator to go out. If the indicator light is blinking
there is a malfunction in the system.
REAR SONAR BUZZER
With power and ground supplied to the sonar control unit and the A/T selector lever in R position, a stationary
object that is at least 7.0 cm (2.8 in.) wide and 1.0 m (39. 0 in.) tall and that is closer than 1.8 m (5.9 ft.) will be
detected by the rear sonar sensors, causing the rear sonar buzzer to sound a tone. As the vehicle moves
closer to the object, the rate of the tone will increase. When the object is less than 25.0 cm (10 in.) from the
rear bumper, the tone will sound continuously.
REAR SONAR SENSORS
With power and ground supplied to the rear sonar sens ors, the sonar sensors transmit an ultrasonic signal.
This signal is reflected back to the sensor by objects large enough and close enough to be detected. The rear
sonar sensors measure the time from the transmitted si gnal to the time the signal is reflected back and sends
this information to the sonar control unit.
BACK-UP LAMP RELAY
The back-up lamp relay provides a reverse signal to the sonar control unit.
AWNIA0127GB
Revision: March 2010 2008 QX56

SN-10
< FUNCTION DIAGNOSIS >
FRONT AND REAR SONAR SYSTEM
FRONT AND REAR SONAR SYSTEM
System DiagramINFOID:0000000001754061
System DescriptionINFOID:0000000001754062
FUNCTION
With power and ground supplied, transmission gear selector lever in R position, and the sonar system OFF
switch ON, the sonar system will detect obstacles within 1.8 m (5.9 ft.) of the rear sonar sensors and the two
outer front sonar sensors. The vehicle operator is notif ied of obstacles by varied rate of tone from the rear
sonar buzzer depending on distance of obstacle being sens ed. If the vehicle speed reaches 50 km/h (31
MPH) the sonar syst em will shut down.
With power and ground supplied, transmission gear selector lever in a forward drive gear, and the sonar sys-
tem OFF switch ON, the front sonar system will detect obstacles within 1.0 m (3 ft.) of the front sonar sensors.
The vehicle operator is notified of obstacles by varied rate of tone from the front sonar buzzer depending on
distance of obstacle being sensed. When the vehicle accelerates to 12 km/h (7.5 MPH) the sonar system will
shut down. When the vehicle decelerates to 8 km/h (5 MPH) the sonar system will turn back on.
SONAR SYSTEM OFF SWITCH
With power and ground supplied to the sonar control unit, transmission gear selector lever in a position other
than P, the sonar system can be di sabled and the sonar buzzers silenced by momentarily pressing the sonar
system OFF switch. The sonar system OFF indicator lamp will be illuminated in the sonar system OFF switch.
The sonar system and buzzers will be di sabled and the sonar system OFF indicator will be illuminated until the
ignition switch is turned OFF. When the ignition switch is turned ON, the sonar system will be enabled.
Depressing the sonar system OFF switch again will enabl e the sonar system also. Enabling the sonar system
will cause the sonar system OFF indicator to go out. The indicator will flash if a malfunction exists in the sys-
tem.
SONAR BUZZERS
With power and ground supplied to the sonar control unit and the A/T selector lever in R position, a stationary
object that is at least 9.0 cm (3.5 in.) wide and that is closer than 1.8 m (5.9 ft.) will be detected by the rear
sonar sensors and the two outer front sonar sensors, causing the rear sonar buzzer to sound a tone. As the
vehicle moves closer to the object, the rate of the tone will increase. When the object is less than 25.0 cm (10
in.) from the rear bumper, the tone will sound continuously.
With power and ground supplied to the sonar control unit and the A/T selector lever in a forward drive gear, a
stationary object that is at least 9.0 cm (3.5 in.) wide and that is closer than 1.0 m (3 ft.) will be detected by the
front sonar sensors, causing the front sonar buzzer to sound a tone. As the vehicle moves closer to the object,
the rate of the tone will increase. When the object is less than 30 cm (12 in.) from the front bumper, the tone
will sound continuously.
REAR SONAR SENSORS
With power and ground supplied to the rear sonar sens ors, the sonar sensors transmit an ultrasonic signal.
This signal is reflected back to the sensor by objects large enough and close enough to be detected. The rear
AWNIA0128GB
Revision: March 2010 2008 QX56