INFINITI QX56 2009 Factory Service Manual

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< ECU DIAGNOSIS >
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
Fail Safe
INFOID:0000000004115482
CAN COMMUNICATION CONTROL
When CAN communication with ECM and BCM is impossible, IPDM E/R performs fail-safe control. After CAN
communication recovers normally, it also returns to normal control.
If No CAN Communication Is Available With ECM
AAMIA0439GB
Revision: December 20092009 QX56

IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
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If No CAN Communication Is Available With BCM
IGNITION RELAY MALFUNCTION DETECTION FUNCTION
• IPDM E/R monitors the voltage at the contact circuit and excitation coil circuit of the ignition relay inside it.
• IPDM E/R judges the ignition relay error if the voltage differs between the contact circuit and the excitation
coil circuit.
• If the ignition relay cannot turn OFF due to contact seizure, it activates the tail lamp relay for 10 minutes to alert the user to the ignition relay malfunction when the ignition switch is turned OFF.
NOTE:
The tail lamp turns OFF when the ignition switch is turned ON.
FRONT WIPER CONTROL
IPDM E/R detects front wiper stop posit ion by a front wiper auto stop signal.
When a front wiper auto stop signal is in the conditions listed below, IPDM E/R stops power supply to wiper
after repeating a front wiper 10 second activation and 20 second stop five times.
NOTE:
This operation status can be confirmed on the IPDM E/R “DATA MONITOR” that displays “Block” for the item
“WIP PROT” while the wiper is stopped.
STARTER MOTOR PROTECTION FUNCTION
IPDM E/R turns OFF the starter control relay to protect the starter motor when the starter control relay remains
active for 90 seconds.
Control part Fail-safe in operation
Cooling fan • Turns ON the cooling fan relay when the ignition switch is turned ON
• Turns OFF the cooling fan relay when the ignition switch is turned OFF
Control part
Fail-safe in operation
Headlamp • Turns ON the headlamp low relay when the ignition switch is turned ON
• Turns OFF the headlamp low relay when the ignition switch is turned OFF
• Headlamp high relay OFF
•Parking lamps
• License plate lamps
• Tail lamps • Turns ON the tail lamp relay when the ignition switch is turned ON
• Turns OFF the tail lamp relay when the ignition switch is turned OFF
Front wiper • The status just before activation of fail-safe control is maintained until the ignition
switch is turned OFF while the front wiper is operating at LO or HI speed.
• The wiper is operated at LO speed until the ignition switch is turned OFF if the fail- safe control is activated while the front wipe r is set in the INT mode and the front wiper
motor is operating.
Rear window defogger Rear window defogger relay OFF
A/C compressor A/C relay OFF
Front fog lamps Front fog lamp relay OFF
Ignition switch Ignition relayTail lamp relay
ON ON —
OFF OFF —
Ignition switchFront wiper switch Auto stop signal
ON OFF
Front wiper stop position signal cannot be
input 10 seconds.
ON The signal does not change for 10 seconds.
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< SYMPTOM DIAGNOSIS >
WIPER AND WASHER SYSTEM SYMPTOMS
SYMPTOM DIAGNOSIS
WIPER AND WASHER SYSTEM SYMPTOMS
Symptom TableINFOID:0000000003776308
CAUTION:
Perform the self-diagnosis with CONSULT-III before performing the diagnosis by symptom. Perform
the diagnosis by DTC if DTC is detected.
Symptom Probable malfunction location Inspection item
Front wiper does not
operate. HI only
• Combination switch
• Harness between combination switch and BCM
•BCM
Combination switch
Refer to BCS-53, "
Symptom
Ta b l e".
• IPDM E/R
• Harness between IPDM E/R and front wiper motor
• Front wiper motor Front wiper moto
r (HI) circuit
Refer to WW-21, "
Compo-
nent Function Check".
Front wiper request signal
•BCM
• IPDM E/R IPDM E/R DATA MONITOR
"FR WIP REQ"
LO and INT • Combination switch
• Harness between combination switch and BCM
•BCM
Combination switch
Refer to BCS-53, "
Symptom
Ta b l e".
• IPDM E/R
• Harness between IPDM E/R and front wiper motor
• Front wiper motor Front wiper motor (LO) circuit
Refer to WW-19, "
Compo-
nent Function Check".
Front wiper request signal
•BCM
• IPDM E/R IPDM E/R DATA MONITOR
"FR WIP REQ"
INT only • Combination switch
• Harness between combination switch and BCM
•BCM
Combination switch
Refer to BCS-53, "
Symptom
Ta b l e".
Front wiper request signal
•BCM
• IPDM E/R IPDM E/R DATA MONITOR
"FR WIP REQ"
HI, LO, and INT SYMPTOM DIAGNOSIS
“FRONT WIPER DOES NOT OPERATE”
Refer to
WW-70, "
Diagnosis Procedure".
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WIPER AND WASHER SYSTEM SYMPTOMSWW-67
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Front wiper does not
stop. HI only
• Combination switch
•BCM
Combination switch
Refer to BCS-53, "
Symptom
Ta b l e".
Front wiper request signal
•BCM
• IPDM E/R IPDM E/R DATA MONITOR
"FR WIP REQ"
IPDM E/R —
LO only • Combination switch
•BCM
Combination switch
Refer to BCS-53, "
Symptom
Ta b l e".
Front wiper request signal
•BCM
• IPDM E/R IPDM E/R DATA MONITOR
"FR WIP REQ"
IPDM E/R —
INT only • Combination switch
•BCM
Combination switch
Refer to BCS-53, "
Symptom
Ta b l e".
Front wiper request signal
•BCM
• IPDM E/R IPDM E/R DATA MONITOR
"FR WIP REQ"
Front wiper does not
operate normally. Intermittent adjustment
cannot be performed.
• Combination switch
• Harness between combination switch and BCM
•BCM
Combination switch
Refer to BCS-53, "
Symptom
Ta b l e".
BCM —
Intermittent control
linked with vehicle
speed cannot be per-
formed. Check the vehicle speed detection wiper setting.
Refer to BCS-22, "
WIPER : CONSULT-III Function (BCM - WIPER)".
Wiper is not linked to
the washer operation. • Combination switch
• Harness between combination switch and BCM
•BCM
Combination switch
Refer to BCS-53, "
Symptom
Ta b l e".
BCM —
Does not return to stop
position (Repeatedly
operates for 10 sec-
onds and then stops
for 20 seconds. After
that, it stops the opera-
tion). • IPDM E/R
• Harness between IPDM E/R and front wiper
motor
• Front wiper motor Front wiper auto stop signal
circuit
Refer to WW-23, "
Compo-
nent Function Check".
Rear wiper does not
operate. ON only
• Combination switch
• Harness between combination switch and BCM
•BCM Combination switch
Refer to BCS-53, "
Symptom
Ta b l e".
INT only • Combination switch
• Harness between combination switch and BCM
•BCM Combination switch
Refer to BCS-53, "
Symptom
Ta b l e".
ON and INT • Combination switch
• Harness between combination switch and BCM
•BCM
Combination switch
Refer to BCS-53, "
Symptom
Ta b l e".
•BCM
• Harness between rear wiper motor and BCM
• Harness between rear wiper motor and ground
• Rear wiper motor
• Glass hatch ajar switch Combination switch
Refer to WW-28, "
Compo-
nent Function Check".
Symptom
Probable malfunction location Inspection item
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< SYMPTOM DIAGNOSIS >
WIPER AND WASHER SYSTEM SYMPTOMS
Rear wiper does not
stop.ON only
• Combination switch
•BCM Rear wiper motor circuit
Refer to WW-28, "
Compo-
nent Function Check".
INT only • Combination switch
•BCM Combination switch
Refer to BCS-53, "
Symptom
Ta b l e".
Rear wiper does not
operate normally. Wiper is not linked to
the washer operation.
• Combination switch
• Harness between rear wiper motor and BCM
•BCM
Combination switch
Refer to BCS-53, "
Symptom
Ta b l e".
BCM —
Rear wiper does not
return to the Stop posi-
tion (Stops after a five-
second operation). •BCM
• Harness between rear wiper motor and BCM
• Rear wiper motor Rear wiper auto stop signal
circuit
Refer to WW-30, "
Compo-
nent Function Check".
Rear wiper stops after
operating for five sec-
onds when ignition
switch is turned ON.
Symptom Probable malfunction location Inspection item
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NORMAL OPERATING CONDITIONWW-69
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NORMAL OPERATING CONDITION
DescriptionINFOID:0000000003776309
FRONT WIPER MOTOR PROTECTION FUNCTION
• IPDM E/R may stop the front wiper to protect the front wiper motor if any obstruction (operation resistance) such as a large amount of snow is detected during the front wiper operation.
• At that time turn OFF the front wiper and remove t he foreign object. Then wait for approximately 20 seconds
or more and reactivate the front wiper. The wiper will operate normally.
REAR WIPER MOTOR PROTECTION FUNCTION
• BCM may stop rear wiper to protect the rear wiper motor when the rear wiper is stopped for 5 seconds or
more due to a snowfall.
• Rear wiper operates normally one minute after the obstacles are removed with rear wiper OFF.
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FRONT WIPER DOES NOT OPERATE
FRONT WIPER DOES NOT OPERATE
DescriptionINFOID:0000000003776310
The front wiper does not operate under any operation conditions.
Diagnosis ProcedureINFOID:0000000003776311
1. CHECK WIPER RELAY OPERATION
IPDM E/R AUTO ACTIVE TEST
1. Start IPDM E/R auto active test. Refer to PCS-8, "
System Description".
2. Check that the front wiper operates at the LO/HI operation.
CONSULT-III ACTIVE TEST
1. Select "FRONT WIPER" of IPDM E/R active test item.
2. While operating the test item , check front wiper operation.
Is front wiper operation normal?
YES >> GO TO 5
NO >> GO TO 2
2. CHECK FRONT WIPER MOTOR FUSE
1. Turn the ignition switch OFF.
2. Check that the following fuse is not blown.
Is the fuse blown?
YES >> Replace the fuse after repairing the applicable circuit.
NO >> GO TO 3
3. CHECK FRONT WIPER MOTOR GROUND OPEN CIRCUIT
1. Disconnect front wiper motor.
2. Check continuity between front wiper motor harness connector and ground.
Does continuity exist?
YES >> GO TO 4
NO >> Repair or replace harness.
4. CHECK FRONT WIPER MOTOR OUTPUT VOLTAGE
CONSULT-III ACTIVE TEST LO : Front wiper LO operation
HI : Front wiper HI operation
OFF : Stop the front wiper.
Unit Location Fuse No. Capacity
Front wiper motor IPDM E/R39 30 A
Front wiper motor
GroundContinuity
Connector Terminal
E23 1 Yes
WKIA2828E
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FRONT WIPER DOES NOT OPERATEWW-71
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1. Turn the ignition switch ON.
2. Select "FRONT WIPER" of IPDM E/R active test item.
3. With operating the test item, check voltage between IPDM E/R harness connector and ground.
Is the measurement value normal?
YES >> Replace front wiper motor. Refer to WW-75, "Wiper Motor and Linkage".
NO >> Replace IPDM E/R. Refer to PCS-34, "
Removal and Installation of IPDM E/R".
5. CHECK FRONT WIPER REQUEST SIGNAL INPUT
CONSULT-III DATA MONITOR
1. Select "FR WIP REQ" of IPDM E/R data monitor item.
2. Switch the front wiper switch to HI and LO.
3. With operating the front wiper switch , check the status of "FR WIP REQ".
Is the status of item normal?
YES >> Replace IPDM E/R. Refer to PCS-34, "Removal and Installation of IPDM E/R".
NO >> GO TO 6
6. CHECK COMBINATION SWITCH
1. Perform the inspection of the combination switch. Refer to BCS-53, "
Symptom Table".
Is combination switch normal?
YES >> Replace BCM. Refer to BCS-56, "Removal and Installation".
NO >> Repair or replace the applicable parts.
Te r m i n a l s Te s t i t e m
Voltage
(Approx.)
(+)
(− )
IPDM E/R
GroundFRONT WIP-
ER
Connector Terminal
E121 32
LO
Battery
voltage
OFF 0 V
35 HI
Battery
voltage
OFF 0 V
WKIA1427E
Monitor item ConditionMonitor
status
FR WIP REQ Front wiper switch HI
HI ON
STOP OFF
Front wiper switch LO 1LOW ON
STOP OFF
Revision: December 20092009 QX56

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< PRECAUTION >
PRECAUTION
PRECAUTION
PRECAUTION
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000005867715
The Supplemental Restraint System such as “A IR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity 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 inopera tive, 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 unintent ional activation of the system. For re moval of Spiral Cable and Air Bag
Module, see the SR section.
• Do not use electrical test equipmen t on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harn esses can be identified 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 Unit or other Airbag System sensors with the Igni-
tion ON or engine running, DO NOT use air or electri c 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 minu tes before performing any service.
Precaution Necessary for Steering W heel Rotation After Battery Disconnect
INFOID:0000000005867716
NOTE:
• This Procedure is applied only to models with Intelligent Key system and NATS (NISSAN ANTI-THEFT SYS-
TEM).
• Remove and install all control units after disconnecting both battery cables with the ignition knob in the
″LOCK ″ position.
• Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.
If DTC is detected, perform trouble diagnosis according to self-diagnostic results.
For models equipped with the Intelligent Key system and NATS, an electrically controlled steering lock mech-
anism is adopted on the key cylinder.
For this reason, if the battery is disconnected or if the battery is discharged, the steering wheel will lock and
steering wheel rotation will become impossible.
If steering wheel rotation is required when battery pow er is interrupted, follow the procedure below before
starting the repair operation.
OPERATION PROCEDURE
1. Connect both battery cables. NOTE:
Supply power using jumper cables if battery is discharged.
2. Use the Intelligent Key or mechanical key to turn the ignition switch to the ″ACC ″ position. At this time, the
steering lock will be released.
3. Disconnect both battery cables. The steering lock will remain released and the steering wheel can be rotated.
4. Perform the necessary repair operation.
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5. When the repair work is completed, return the ignition switch to the ″LOCK ″ position before connecting
the battery cables. (At this time, the steering lock mechanism will engage.)
6. Perform a self-diagnosis check of al l control units using CONSULT-III.
Revision: December 20092009 QX56