heating INFINITI QX56 2011 Factory Service Manual
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REPAIRING HIGH STRENGTH STEELBRM-5
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The repair of reinforcements (such as side members) by heat- ing is not recommended, because it may weaken the compo-
nent. When heating is unavoidable, never heat HSS parts
above 550 °C (1,022 °F).
Verify heating temperature with a thermometer.
(Crayon-type and other similar type thermometer are appropri-
ate.)
When straightening body panels, use caution in pul ling any HSS panel. Because HSS is very strong,
pulling may cause deformation in adjacent sections of the body. In this case, increase the number of
measuring points, and carefully pull the HSS panel.
When cutting HSS panels, avoid gas (torch) cutting if possible.
Instead, use a saw to avoid weakening surrounding areas due
to heat. If gas (torch) cutting is unavoidable, allow a minimum
margin of 50 mm (1.97 in).
When welding HSS panels, use spot welding whenever possi- ble in order to minimize weakening surrounding areas due to
heat.
If spot welding is impossible, use MIG. welding. Do not use
gas (torch) for welding because it is inferior in welding
strength.
Spot welding on HSS panels is harder than that of an ordinary steel panel.
Therefore, when cutting spot welds on a HSS panel, use a low
speed high torque drill (1,000 to 1,200 rpm) to increase drill bit
durability and facilitate the operation.
PIIA0115E
PIIA0117E
PIIA0144E
PIIA0145E
Revision: 2010 May2011 QX56
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![INFINITI QX56 2011 Factory Service Manual
CCS
HANDLING PRECAUTIONCCS-27
< SYSTEM DESCRIPTION > [ICC]
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HANDLING PRECAUTION
Precautions for Vehicle-to-V ehicle Distance Control ModeINFOID:0000000006224276
ICC sys INFINITI QX56 2011 Factory Service Manual
CCS
HANDLING PRECAUTIONCCS-27
< SYSTEM DESCRIPTION > [ICC]
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Precautions for Vehicle-to-V ehicle Distance Control ModeINFOID:0000000006224276
ICC sys](/img/42/57033/w960_57033-761.png)
CCS
HANDLING PRECAUTIONCCS-27
< SYSTEM DESCRIPTION > [ICC]
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HANDLING PRECAUTION
Precautions for Vehicle-to-V ehicle Distance Control ModeINFOID:0000000006224276
ICC system is only an aid to assist the driver and is not a collision warning or avoidance device. It is the\
driver's responsibility to stay alert, drive safe ly and be in control of the vehicle at all times.
The system is primarily intended for use on straight, dry, open roads with light traffic. It is not advisable to
use the system in city traffic or congested areas.
This system will not adapt automatically to road condi tions. This system should be used in evenly flowing
traffic. Do not use the system on roads with sharp curves, or on icy roads, in heavy rain or in fog.
The ICC sensor will not detect under most conditions.
- Stationary and slow moving vehicles.
- Pedestrians or objects in the roadway.
- Oncoming vehicles in the some lane.
- Motorcycles traveling offset in the travel lane.
As there is a performance limit to the distance contro l function, never rely solely on the ICC system. This
system does not correct careless, inattentive or absent -minded driving, or overcome poor visibility in rain,
fog, or other bad weather. Decelerate the vehicle speed by depressing the brake pedal, depending on the
distance to the vehicle ahead and the surrounding circumstances in order to maintain a safe distance
between vehicles.
If the vehicle ahead comes to a stop, the vehicle decelerat es to a standstill within the limitations of the sys-
tem. The system will cancel once it judges that the vehicle has come to a standstill and sound a warning
chime. To prevent the vehicle from movi ng, the driver must depress the brake pedal.
The system may not detect the vehicle in front of the dr iver in certain road or weather conditions. To avoid
accidents, never use the ICC syst em under the following conditions:
- On roads where the traffic is heavy or there are sharp curves.
- On slippery road surfaces such as on ice or snow, etc.
- On off-road surfaces such as on sand or rock, etc.
- During bad weather (rain, fog, snow, etc.)
- When the windshield wipers are operating at high speed. The ICC system may cancel when the wipers are
set to the AUTO position.
- When strong light (for example, at sunrise or sunset ) is directly shining on the front of the vehicle.
- When rain, snow or dirt adhere to the system sensor.
- On steep downhill roads (the vehicle may go beyond the set vehicle speed and frequent braking may result in overheating the brakes).
- On repeated uphill and downhill roads.
- When traffic conditions make it difficult to keep a proper distance between vehicles because of frequent acceleration or deceleration.
- When towing a trailer or other vehicle
In some road or traffic conditions, a vehicle or object can unexpectedly come into the sensor detection zone and cause automatic braking. The driver may need to c ontrol the distance from other vehicles using the
accelerator pedal. Always stay alert and avoid using t he ICC system when it is not recommended in this sec-
tion.
The vehicle-to-vehicle distance control mode uses a sensor located on the front of the vehicle to detect vehi-
cles traveling ahead. The sensor generally detects t he signals returned from the reflectors on a vehicle
ahead. Therefore, if the sensor c annot detect the reflector on the v ehicle ahead, the ICC system may not
maintain the selected distance.
The following are some conditions in which the sensor cannot detect the signals:
- When the reflector of the vehicle ahead is positioned high on the vehicle (trailer, etc.).
- When the reflector on the vehicle ahead is missing, damaged or covered.
- When the reflector of the vehicle ahead is covered with dirt, snow and road spray.
- When the snow or road spray from traveling vehicles reduces the sensor's visibility.
- When dense exhaust or other smoke (black smoke) fr om vehicles reduces the sensor's visibility.
- When excessively heavy baggage is loaded in the rear seat or the luggage room of own vehicle.
- When the vehicle is towing a trailer, etc.
The ICC system is designed to automatic ally check the sensor's operation within the limitation of the system.
When the sensor is covered with dirt or is obstruct ed, the system will automatically be canceled. If the sen-
sor is covered with ice, a transparent or translucent vinyl bag, etc., the ICC system may not detect them. In
these instances, the vehicle-to-vehicle distance control mode may not cancel and may not be able to main-
tain the selected following distance from the vehicle ahead. Be sure to check and clean the sensor regularly.
Revision: 2010 May2011 QX56
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![INFINITI QX56 2011 Factory Service Manual
CCS
NORMAL OPERATING CONDITIONCCS-173
< SYMPTOM DIAGNOSIS > [ICC]
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NORMAL OPERATING CONDITION
DescriptionINFOID:0000000006224457
PRECAUTIONS FOR VEHICLE-TO-VEHICLE DISTAN INFINITI QX56 2011 Factory Service Manual
CCS
NORMAL OPERATING CONDITIONCCS-173
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NORMAL OPERATING CONDITION
DescriptionINFOID:0000000006224457
PRECAUTIONS FOR VEHICLE-TO-VEHICLE DISTAN](/img/42/57033/w960_57033-907.png)
CCS
NORMAL OPERATING CONDITIONCCS-173
< SYMPTOM DIAGNOSIS > [ICC]
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NORMAL OPERATING CONDITION
DescriptionINFOID:0000000006224457
PRECAUTIONS FOR VEHICLE-TO-VEHICLE DISTANCE CONTROL MODE
ICC system is only an aid to assist the driver and is not a collision warning or avoidance device. It is the\
driver's responsibility to stay alert, drive safe ly and be in control of the vehicle at all times.
The system is primarily intended for use on straight, dry, open roads with light traffic. It is not advisable to
use the system in city traffic or congested areas.
This system will not adapt automatically to road condi tions. This system should be used in evenly flowing
traffic. Do not use the system on roads with sharp curves, or on icy roads, in heavy rain or in fog.
The ICC sensor will not detect under most conditions.
- Stationary and slow moving vehicles.
- Pedestrians or objects in the roadway.
- Oncoming vehicles in the some lane.
- Motorcycles traveling offset in the travel lane.
As there is a performance limit to the distance contro l function, never rely solely on the ICC system. This
system does not correct careless, inattentive or absent -minded driving, or overcome poor visibility in rain,
fog, or other bad weather. Decelerate the vehicle speed by depressing the brake pedal, depending on the
distance to the vehicle ahead and the surrounding circumstances in order to maintain a safe distance
between vehicles.
If the vehicle ahead comes to a stop, the vehicle decelerat es to a standstill within the limitations of the sys-
tem. The system will cancel once it judges that the vehicle has come to a standstill and sound a warning
chime. To prevent the vehicle from movi ng, the driver must depress the brake pedal.
The system may not detect the vehicle in front of the dr iver in certain road or weather conditions. To avoid
accidents, never use the ICC syst em under the following conditions:
- On roads where the traffic is heavy or there are sharp curves.
- On slippery road surfaces such as on ice or snow, etc.
- On off-road surfaces such as on sand or rock, etc.
- During bad weather (rain, fog, snow, etc.)
- When the windshield wipers are operating at high speed. The ICC system may cancel when the wipers are
set to the AUTO position.
- When strong light (for example, at sunrise or sunset ) is directly shining on the front of the vehicle.
- When rain, snow or dirt adhere to the system sensor.
- On steep downhill roads (the vehicle may go beyond the set vehicle speed and frequent braking may result
in overheating the brakes).
- On repeated uphill and downhill roads.
- When traffic conditions make it difficult to keep a proper distance between vehicles because of frequent
acceleration or deceleration.
- When towing a trailer or other vehicle
In some road or traffic conditions, a vehicle or object can unexpectedly come into the sensor detection zone
and cause automatic braking. The driver may need to c ontrol the distance from other vehicles using the
accelerator pedal. Always stay alert and avoid using t he ICC system when it is not recommended in this sec-
tion.
The vehicle-to-vehicle distance control mode uses a sensor located on the front of the vehicle to detect vehi-
cles traveling ahead. The sensor generally detects t he signals returned from the reflectors on a vehicle
ahead. Therefore, if the sensor c annot detect the reflector on the v ehicle ahead, the ICC system may not
maintain the selected distance.
The following are some conditions in which the sensor cannot detect the signals:
- When the reflector of the vehicle ahead is positioned high on the vehicle (trailer, etc.).
- When the reflector on the vehicle ahead is missing, damaged or covered.
- When the reflector of the vehicle ahead is covered with dirt, snow and road spray.
- When the snow or road spray from traveling vehicles reduces the sensor's visibility.
- When dense exhaust or other smoke (black smoke) fr om vehicles reduces the sensor's visibility.
- When excessively heavy baggage is loaded in the rear seat or the luggage room of own vehicle.
- When the vehicle is towing a trailer, etc.
The ICC system is designed to automatic ally check the sensor's operation within the limitation of the system.
When the sensor is covered with dirt or is obstruct ed, the system will automatically be canceled. If the sen-
sor is covered with ice, a transparent or translucent vinyl bag, etc., the ICC system may not detect them. In
these instances, the vehicle-to-vehicle distance control mode may not cancel and may not be able to main-
tain the selected following distance from the vehicle ahead. Be sure to check and clean the sensor regularly.
Revision: 2010 May2011 QX56
Page 943 of 5598

CO-1
ENGINE
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CONTENTS
ENGINE COOLING SYSTEM
PRECAUTION ................ ...............................2
PRECAUTIONS .............................................. .....2
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
2
PREPARATION ............................................3
PREPARATION .............................................. .....3
Commercial Service Tools ................................. ......3
SYSTEM DESCRIPTION ..............................4
DESCRIPTION ............................................... .....4
Engine Cooling System ..................................... ......4
Engine Cooling System Schematic .........................5
SYMPTOM DIAGNOSIS ...............................6
OVERHEATING CAUSE ANALYSIS ............. .....6
Troubleshooting Chart ........................................ ......6
PERIODIC MAINTENANCE ..........................8
ENGINE COOLANT ....................................... .....8
Inspection ............................................................ ......8
Draining .....................................................................8
Refilling .....................................................................9
Flushing ...................................................................10
RADIATOR .........................................................11
RESERVOIR TANK CAP ..........................................11
RESERVOIR TANK CAP : Inspection ................. ....11
RADIATOR ............................................................. ....11
RADIATOR : Inspection ...........................................11
REMOVAL AND INSTALLATION ...............13
RADIATOR ....................................... .................13
Exploded View ..................................................... ....13
Removal and Installation .........................................13
Inspection ................................................................15
COOLING FAN ..................................................16
Exploded View .........................................................16
Removal and Installation .........................................16
Inspection ................................................................17
WATER PUMP ..................................................18
Exploded View .........................................................18
Removal and Installation .........................................18
Inspection ................................................................19
WATER INLET AND THERMOSTAT ASSEM-
BLY ....................................................................
20
Exploded View .........................................................20
Removal and Installation .........................................20
Inspection ................................................................21
SERVICE DATA AND SPECIFICATIONS
(SDS) ............... .............................................
23
SERVICE DATA AND SPECIFICATIONS
(SDS) .................................................................
23
Periodical Maintenance Specification ................ ....23
Radiator ...................................................................23
Thermostat ..............................................................23
Revision: 2010 May2011 QX56
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CO-6
< SYMPTOM DIAGNOSIS >
OVERHEATING CAUSE ANALYSIS
SYMPTOM DIAGNOSIS
OVERHEATING CAUSE ANALYSIS
Troubleshooting ChartINFOID:0000000006289656
Symptom Check items
Cooling sys-
tem parts
malfunction Poor heat transfer
Water pump malfunction Worn or loose drive belt
—
Thermostat stuck closed —
Damaged fins
Dust contamination or pa-
per clogging
Physical damage
Clogged radiator cooling
tube Excess foreign material
(rust, dirt, sand, etc.)
Reduced air flow Cooling fan does not oper-
ate
Fan assembly —
High resistance to fan rota-
tion
Damaged fan blades
Damaged radiator shroud — — —
Improper engine coolant
mixture ratio ———
Poor engine coolant quality — Engine coolant density —
Insufficient engine coolant Engine coolant leakageCooling hose
Loose clamp
Cracked hose
Water pump Poor sealing
Radiator cap Loose
Poor sealing
Radiator O-ring for da
mage, deterio-
ration or improper fitting
Cracked radiator tank
Cracked radiator core
Reservoir tank Cracked reservoir tank
Overflowing reservoir tank Exhaust gas leakage into
cooling system Cylinder head deterioration
Cylinder head gasket deteri-
oration
Revision: 2010 May2011 QX56
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OVERHEATING CAUSE ANALYSISCO-7
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Except cool-
ing system
parts mal-
function — Overload on engine
Abusive driving
High engine rpm under no
load
Driving in low gear for ex-
tended time
Driving at extremely high
speed
Powertrain system malfunc-
tion
—
Installed improper size
wheels and tires
Dragging brakes
Improper ignition timing
Blocked or restricted air
flow Blocked bumper —
—
Blocked radiator grille
Installed car brassiere
Mud contamination or paper
clogging
Blocked radiator —
Blocked condenser Blocked air flow
Installed large fog lamp
Symptom Check items
Revision: 2010 May2011 QX56
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![INFINITI QX56 2011 Factory Service Manual
DAS-76
< SYSTEM DESCRIPTION >[DCA]
HANDLING PRECAUTION
HANDLING PRECAUTION
Precautions for Distance Control AssistINFOID:0000000006223505
If the vehicle ahead comes to a stop, the vehicle deceler
a INFINITI QX56 2011 Factory Service Manual
DAS-76
< SYSTEM DESCRIPTION >[DCA]
HANDLING PRECAUTION
HANDLING PRECAUTION
Precautions for Distance Control AssistINFOID:0000000006223505
If the vehicle ahead comes to a stop, the vehicle deceler
a](/img/42/57033/w960_57033-1040.png)
DAS-76
< SYSTEM DESCRIPTION >[DCA]
HANDLING PRECAUTION
HANDLING PRECAUTION
Precautions for Distance Control AssistINFOID:0000000006223505
If the vehicle ahead comes to a stop, the vehicle deceler
ates to a standstill within the limitations of the sys-
tem. The system will cancel once it judges that the vehi cle has come to a standstill with a warning chime. To
prevent the vehicle from moving, t he driver must depress the brake pedal.
The DCA system will not apply brake control while the driver is depressing the accelerator pedal.
This system is only an aid to assist the driver and is not a collision warning or avoidance device. It is the
driver's responsibility to stay alert, drive safe ly and be in control of the vehicle at all times.
This system will not adapt automatically to road condi tions. Do not use the system on roads with sharp
curves, or on icy roads, in heavy rain or in fog.
The distance sensor will not detect under most conditions.
- Stationary and slow moving vehicles
- Pedestrians or objects in the roadway
- Oncoming vehicles in the same lane
- Motorcycles traveling offset in the travel lane
As there is a performance limit to the distance contro l function, never rely solely on the DCA system. This
system does not correct careless, inat tentive or absent-minded driving, or overcome poor visibility in rain,
fog, or other bad weather. Decelerate the vehi cle speed by depressing the brake pedal, depending on the
distance to the vehicle ahead and the surrounding circumstances in order to maintain a safe distance
between vehicles.
The system may not detect the vehicle in front of own v ehicle in certain road or weather conditions. To avoid
accidents, never use the DCA system under the following conditions.
- On roads with sharp curves
- On slippery road surfaces such as on ice or snow, etc.
- On off-road surfaces such as on sand or rock, etc.
- During bad weather (rain, fog, snow, etc.)
- When strong light (for example, at sunrise or sunset) is directly shining on the front of the vehicle
- When rain, snow or dirt adhere to the system sensor
- On steep downhill roads (frequent braking may result in overheating the brakes)
- On repeated uphill and downhill roads
- When towing a trailer or other vehicle
In some road or traffic conditions, a vehicle or objec t can unexpectedly come into the sensor detection zone
and cause automatic braking. Driver may need to control the distance from other vehicles using the acceler-
ator pedal. Always stay alert and avoid using the DCA system when it is not recommended in this section.
The following are some conditions in which the sensor cannot detect the signals.
- When the reflector of the vehicle ahead is positioned high on the vehicle (trailer, etc.)
- When the reflector on the vehicle ahead is missing, damaged or covered
- When the reflector of the vehicle ahead is covered with dirt, snow and road spray
- When the snow or road spray from traveling vehicles reduces the sensor's visibility
- When dense exhaust or other smoke (black smoke) fr om vehicles reduces the sensor's visibility
- When excessively heavy baggage is loaded in the rear seat or the luggage room of own vehicle
The DCA system is designed to autom atically check the sensor's operation. When the sensor is covered
with dirt or is obstructed, the system will automatically be canceled. If the sensor is covered with ice, a trans-
parent or translucent vinyl bag, etc., the DCA syste m may not detect them. In these instances, the DCA sys-
tem may not be able to decelerate the vehicle properly. Be sure to check and clean the sensor regularly.
The DCA system is designed to help assist the driver to maintain a following distance from the vehicle
ahead. The system will decelerate as necessary and if the vehicle ahead comes to a stop, the vehicle decel-
erates to standstill. However, the DCA system can only apply up to 25% of the vehicles total braking power.
If a vehicle moves into the traveling lane ahead or if a vehicle traveling ahead rapidly decelerates, the dis-
tance between vehicles may become closer because t he DCA system cannot decelerate the vehicle quickly
enough. If this occurs, the DCA system will sound a warn ing chime and blink the system display to notify the
driver to take necessary action.
The DCA system does not control vehicle speed or warn when driver approach stationary and slow moving
vehicles. Driver must pay attention to vehicle operat ion to maintain proper distance from vehicles ahead.
Revision: 2010 May2011 QX56
Page 1175 of 5598
![INFINITI QX56 2011 Factory Service Manual
DAS-210
< SYMPTOM DIAGNOSIS >[DCA]
NORMAL OPERATING CONDITION
NORMAL OPERATING CONDITION
DescriptionINFOID:0000000006223665
PRECAUTIONS FOR DISTANCE CONTROL ASSIST (DCA) SYSTEM
If the vehicle ahead INFINITI QX56 2011 Factory Service Manual
DAS-210
< SYMPTOM DIAGNOSIS >[DCA]
NORMAL OPERATING CONDITION
NORMAL OPERATING CONDITION
DescriptionINFOID:0000000006223665
PRECAUTIONS FOR DISTANCE CONTROL ASSIST (DCA) SYSTEM
If the vehicle ahead](/img/42/57033/w960_57033-1174.png)
DAS-210
< SYMPTOM DIAGNOSIS >[DCA]
NORMAL OPERATING CONDITION
NORMAL OPERATING CONDITION
DescriptionINFOID:0000000006223665
PRECAUTIONS FOR DISTANCE CONTROL ASSIST (DCA) SYSTEM
If the vehicle ahead comes to a stop, the vehicle deceler
ates to a standstill within the limitations of the sys-
tem. The system will cancel once it judges that the vehi cle has come to a standstill with a warning chime. To
prevent the vehicle from moving, t he driver must depress the brake pedal.
The DCA system will not apply brake control while the driver is depressing the accelerator pedal.
This system is only an aid to assist the driver and is not a collision warning or avoidance device. It is the
driver's responsibility to stay alert, drive safe ly and be in control of the vehicle at all times.
This system will not adapt automatically to road condi tions. Do not use the system on roads with sharp
curves, or on icy roads, in heavy rain or in fog.
The distance sensor will not detect under most conditions.
- Stationary and slow moving vehicles
- Pedestrians or objects in the roadway
- Oncoming vehicles in the same lane
- Motorcycles traveling offset in the travel lane
As there is a performance limit to the distance contro l function, never rely solely on the DCA system. This
system does not correct careless, inat tentive or absent-minded driving, or overcome poor visibility in rain,
fog, or other bad weather. Decelerate the vehi cle speed by depressing the brake pedal, depending on the
distance to the vehicle ahead and the surrounding circumstances in order to maintain a safe distance
between vehicles.
The system may not detect the vehicle in front of own v ehicle in certain road or weather conditions. To avoid
accidents, never use the DCA system under the following conditions.
- On roads with sharp curves
- On slippery road surfaces such as on ice or snow, etc.
- On off-road surfaces such as on sand or rock, etc.
- During bad weather (rain, fog, snow, etc.)
- When strong light (for example, at sunrise or sunset) is directly shining on the front of the vehicle
- When rain, snow or dirt adhere to the system sensor
- On steep downhill roads (frequent braking may result in overheating the brakes)
- On repeated uphill and downhill roads
- When towing a trailer or other vehicle
In some road or traffic conditions, a vehicle or objec t can unexpectedly come into the sensor detection zone
and cause automatic braking. Driver may need to control the distance from other vehicles using the acceler-
ator pedal. Always stay alert and avoid using the DCA system when it is not recommended in this section.
The following are some conditions in which the sensor cannot detect the signals.
- When the reflector of the vehicle ahead is positioned high on the vehicle (trailer, etc.)
- When the reflector on the vehicle ahead is missing, damaged or covered
- When the reflector of the vehicle ahead is covered with dirt, snow and road spray
- When the snow or road spray from traveling vehicles reduces the sensor's visibility
- When dense exhaust or other smoke (black smoke) fr om vehicles reduces the sensor's visibility
- When excessively heavy baggage is loaded in the rear seat or the luggage room of own vehicle
The DCA system is designed to autom atically check the sensor's operation. When the sensor is covered
with dirt or is obstructed, the system will automatically be canceled. If the sensor is covered with ice, a trans-
parent or translucent vinyl bag, etc., the DCA syste m may not detect them. In these instances, the DCA sys-
tem may not be able to decelerate the vehicle properly. Be sure to check and clean the sensor regularly.
The DCA system is designed to help assist the driver to maintain a following distance from the vehicle
ahead. The system will decelerate as necessary and if the vehicle ahead comes to a stop, the vehicle decel-
erates to standstill. However, the DCA system can only apply up to 25% of the vehicles total braking power.
If a vehicle moves into the traveling lane ahead or if a vehicle traveling ahead rapidly decelerates, the dis-
tance between vehicles may become closer because t he DCA system cannot decelerate the vehicle quickly
enough. If this occurs, the DCA system will sound a warn ing chime and blink the system display to notify the
driver to take necessary action.
The DCA system does not control vehicle speed or warn when driver approach stationary and slow moving
vehicles. Driver must pay attention to vehicle operat ion to maintain proper distance from vehicles ahead.
Revision: 2010 May2011 QX56
Page 1497 of 5598

COMPONENT PARTSDEF-5
< SYSTEM DESCRIPTION >
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SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts LocationINFOID:0000000006299423
Component DescriptionINFOID:0000000006299424
1. BCM Refer to BCS-4, "
BODY CONTROL
SYSTEM : Component Parts Loca-
tion"
2. Door mirror defogger (driver side) 3. Rear window defogger connector
4. Rear window defogger connector 5. Multifunction switch (rear window defogger switch)
Refer to AV- 9 , "
Component Parts Lo-
cation"
6. IPDM E/R
Refer to PCS-4, "
Component Parts
Location"
7. AV control unit 8. Wiper deicer
JMLIA0978ZZ
BCM Transmits rear window defogger switch operation to IPDM E/R via CAN commu-
nication
Performs the timer control of rear window defogger
IPDM E/R Controls rear window defogger relay when rear window defogger switch signal is re-
ceived via CAN communication, and then operates rear window defogger
Multifunction switch The rear window defogger switch is installed
Turns the indicator lamp ON when detecting the operation of rear window defog-
ger
Rear window defogger switch The rear window defogger is operated by turning the rear window defogger switch
ON.
The indicator lamp in the rear window defogger switch illuminates when the rear window defogger is operating.
Rear window defogger relay Operates the rear window defogger with the control signal from IPDM E/R
Rear window defogger Heats the heating wire with the power supply from the rear window defogger relay
to prevent the rear window from fogging up.
Door mirror defogger Heats the heating wire with the power supply from the rear window defogger relay
to prevent the door mirror from fogging up.
Wiper deicer Heats the heating wire with the power supply from the wiper deicer relay to thaw the
frozen wiper blade and glass.
Wiper deicer relay Supplies power to the wiper deicer with rear window defogger relay control.
Revision: 2010 May2011 QX56
Page 1518 of 5598

DEF-26
< DTC/CIRCUIT DIAGNOSIS >
REAR WINDOW DEFOGGER RELAY
REAR WINDOW DEFOGGER RELAY
DescriptionINFOID:0000000006299436
The rear window defogger is operated by turning the rear window defogger switch ON.
Component Function CheckINFOID:0000000006299437
1.CHECK FUNCTION
1. Perform IPDM E/R Active Test (“REAR DEFOGGER”) using CONSULT-III.
2. Touch “ON”.
3. Check that the rear window heating wire is getting warmer.
Is the inspection result normal?
YES >> Rear window defogger relay function is OK.
NO >> Refer to DEF-26, "
Diagnosis Procedure"
Diagnosis ProcedureINFOID:0000000006299438
1.CHECK FUSE
1. Turn ignition switch OFF.
2. Check the 15A fuse (No. 41, 42 located in IPDM E/R).
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace the blown fuse after repairing the affected circuit if a fuse is blown.
2.CHECK IPDM E/R OUTPUT SIGNAL
1. Perform IPDM E/R Active Test (“REAR DEFOGGER”) using CONSULT-III.
2. Touch “ON”.
3. Check voltage between IPDM E/R harness connector and ground.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace IPDM E/R. Refer to PCS-32, "
Removal and Installation".
(+)
(− ) CONSULT-III Active Test condition Voltage (V)
(Approx.)
IPDM E/R
Connector Terminal
E11 14 Ground REAR DEFOGGER ON Battery voltage
OFF 0
Revision: 2010 May2011 QX56