seats INFINITI QX56 2006 Factory User Guide

EM-72Revision: November 2009
CYLINDER HEAD
2006 QX56
3. Heat the cylinder head to 110° to 130 °C (230 ° to 266 °F) by
soaking it in heated oil.
4. Cool the valve seats well with dry ice. Force fit the valve seat into the cylinder head. CAUTION:

Avoid directly touching cold valve seats.

Cylinder head contains heat. When working, wear protective equipment to avoid getting burned.
5. Finish the seat to the specified dimensions using suitable tool. Refer to EM-108, "
Va l v e S e a t" .
CAUTION:
When using valve seat cutter, firmly grip the cutter handle
with both hands. Then, press on the contacting surface all
around the circumference to cut in a single drive. Improper
pressure on the cutter or cutting many different times may
result in stage valve seat.
6. Grind to obtain the dimensions indicated as shown.

Using compound, grind to adjust valve fitting.
7. Check again for normal contact. Refer to EM-71, "
VALVE SEAT CONTACT" .
SEM008A
SEM934C
KBIA2531E
KBIA2544E

EM-86Revision: November 2009
CYLINDER BLOCK
2006 QX56
15. Tighten connecting rod bolts using Tool.

Apply engine oil to threads and seats of connecting rod bolts.

After tightening bolts, make sure the crankshaft rotates
smoothly.

Check connecting rod side clearance. Refer to EM-94, "CON-
NECTING ROD SIDE CLEARANCE" .
16. Install knock sensors. CAUTION:
If knock sensor is dropped, replace it with a new one.

Make sure that there is no foreign material on the cylinder
block mating surface and the back surface of knock sensor.

Install it with its connector facing the center of the cylinder
block side.

Do not tighten knock sensor bolts while holding connector.

Make sure knock sensor does not interfere with other parts.

Position the sub-harness as shown before installing intake
manifold.
17. Installation of the remaining components is in the reverse order of removal.
18. Remove engine assembly from engine stand.
19. Install drive plate.

Align dowel pin of crankshaft rear end with pin holes of each
part to install. Tool number : KV10112100 (BT-8653-A)
Connecting rod bolts
Step 1
: 19.6 N·m (1.5 kg-m, 11 ft-lb)
Step 2 : 90° clockwise
WBIA0627E
KBIA2493E
KBIA2549E
KBIA2494E

GW-1
GLASSES, WINDOW SYSTEM & MIRRORS
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PRECAUTIONS .....................................................
..... 3
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” ............................................................. ..... 3
Handling for Adhesive and Primer ...................... ..... 3
PREPARATION ...................................................... ..... 4
Special Service Tool ............................................ ..... 4
Commercial Service Tool .................................... ..... 4
SQUEAK AND RATTLE TROUBLE DIAGNOSES ..... 5
Work Flow ................................................................ 5 CUSTOMER INTERVIEW ................................ ..... 5
DUPLICATE THE NOISE AND TEST DRIVE .. ..... 6
CHECK RELATED SERVICE BULLETINS ...... ..... 6
LOCATE THE NOISE AND IDENTIFY THE
ROOT CAUSE ................................................. ..... 6
REPAIR THE CAUSE ...................................... ..... 6
CONFIRM THE REPAIR .................................. ..... 7
Generic Squeak and Rattle Troubleshooting ...... ..... 7
INSTRUMENT PANEL ..................................... ..... 7
CENTER CONSOLE ........................................ ..... 7
DOORS ............................................................ ..... 7
TRUNK ............................................................. ..... 8
SUNROOF/HEADLINER .................................. ..... 8
OVERHEAD CONSOLE (FRONT AND REAR) ..... 8
SEATS .............................................................. ..... 8
UNDERHOOD .................................................. ..... 8
Diagnostic Worksheet ......................................... ..... 9
WINDSHIELD GLASS ........................................... ....11
Removal and Installation ..................................... .... 11
REMOVAL ........................................................ .... 11
INSTALLATION ................................................ .... 11
REAR WINDOW GLASS AND MOLDING ............ ... 13
Removal and Installation ..................................... ... 13
REMOVAL ........................................................ ... 13
INSTALLATION ................................................ ... 14
POWER WINDOW SYSTEM ................................. ... 15
Component Parts and Harness Connector Location ... 15
System Description ............................................. ... 16
MANUAL OPERATION .................................... ... 16
AUTO OPERATION ......................................... ... 18POWER WINDOW SERIAL LINK ....................
... 18
POWER WINDOW LOCK ................................ ... 19
RETAINED POWER OPERATION ................... ... 19
ANTI-PINCH SYSTEM ..................................... ... 19
POWER WINDOW CONTROL BY THE FRONT
DOOR LOCK ASSEMBLY LH (KEY CYLINDER
SWITCH) .......................................................... ... 19
CAN Communication System Description ........... ... 19
Schematic ............................................................ ... 20
Wiring Diagram — WINDOW — ............................. 22
Terminal and Reference Value for Main Power Win-
dow and Door Lock/Unlock Switch ...................... ... 30
Terminal and Reference Value for Power Window
and Door Lock/Unlock Switch RH .......................... 30
Terminal and Reference Value for BCM .............. ... 32
Work Flow ............................................................... 33
CONSULT-II Function (BCM) .............................. ... 33
CONSULT-II INSPECTION PROCEDURE ....... ... 33
ACTIVE TEST ..................................................... 34
WORK SUPPORT ............................................ ... 34
DATA MONITOR .............................................. ... 34
Trouble Diagnoses Symptom Chart .................... ... 35
BCM Power Supply and Ground Circuit Check ... ... 37
Main Power Window and Door Lock/Unlock Switch
Power Supply and Ground Circuit Check ............ ... 38
Power Window and Door Lock/Unlock Switch RH
Power Supply and Ground Circuit Check ............ ... 39
Front Power Window Motor LH Circuit Check ..... ... 40
Front Power Window Motor RH Circuit Check ....... 41
Limit Switch Circuit Check Front LH .................... ... 41
Limit Switch Circuit Check Front RH ................... ... 43
Encoder Circuit Check Front LH .......................... ... 44
Encoder Circuit Check Front RH ......................... ... 46
Door Switch Check ................................................. 48
Front Door Lock Assembly LH (Key Cylinder Switch)
Check .................................................................. ... 49
Power Window Serial Link Check Front LH and RH ... 51
Rear Power Window Control Unit LH or RH Power
Supply and Ground Circuit Check ....................... ... 53
Rear Power Window Switch LH or RH Power Supply

GW-8
SQUEAK AND RATTLE TROUBLE DIAGNOSES
Revision: November 20092006 QX56
TRUNK
Trunk noises are often caused by a loose jack or loose items put into the trunk by the owner.
In addition look for:
1. Trunk lid bumpers out of adjustment
2. Trunk lid striker out of adjustment
3. The trunk lid torsion bars knocking together
4. A loose license plate or bracket
Most of these incidents can be repaired by adjusting, securing or insulating the item(s) or component(s) caus-
ing the noise.
SUNROOF/HEADLINER
Noises in the sunroof/headliner area can often be traced to one of the following:
1. Sunroof lid, rail, linkage or seals making a rattle or light knocking noise
2. Sun visor shaft shaking in the holder
3. Front or rear windshield touching headliner and squeaking
Again, pressing on the components to stop the noise while duplicating the conditions can isolate most of these
incidents. Repairs usually consist of insulating with felt cloth tape.
OVERHEAD CONSOLE (FRONT AND REAR)
Overhead console noises are often caused by the console panel clips not being engaged correctly. Most of
these incidents are repaired by pushing up on the console at the clip locations until the clips engage.
In addition look for:
1. Loose harness or harness connectors.
2. Front console map/reading lamp lense loose.
3. Loose screws at console attachment points.
SEATS
When isolating seat noise it's important to note the position the seat is in and the load placed on the seat when
the noise is present. These conditions should be duplicated when verifying and isolating the cause of the
noise.
Cause of seat noise include:
1. Headrest rods and holder
2. A squeak between the seat pad cushion and frame
3. The rear seatback lock and bracket
These noises can be isolated by moving or pressing on the suspected components while duplicating the con-
ditions under which the noise occurs. Most of these incidents can be repaired by repositioning the component
or applying urethane tape to the contact area.
UNDERHOOD
Some interior noise may be caused by components under the hood or on the engine wall. The noise is then
transmitted into the passenger compartment.
Causes of transmitted underhood noise include:
1. Any component mounted to the engine wall
2. Components that pass through the engine wall
3. Engine wall mounts and connectors
4. Loose radiator mounting pins
5. Hood bumpers out of adjustment
6. Hood striker out of adjustment
These noises can be difficult to isolate since they cannot be reached from the interior of the vehicle. The best
method is to secure, move or insulate one component at a time and test drive the vehicle. Also, engine RPM
or load can be changed to isolate the noise. Repairs can usually be made by moving, adjusting, securing, or
insulating the component causing the noise.

IP-1
INSTRUMENT PANEL
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Revision: November 2009 2006 QX56
PRECAUTIONS .....................................................
..... 2
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” ............................................................. ..... 2
PREPARATION ...................................................... ..... 3
Special Service Tools .......................................... ..... 3
Commercial Service Tools ................................... ..... 3
SQUEAK AND RATTLE TROUBLE DIAGNOSIS . ..... 4
Work Flow ................................................................ 4 CUSTOMER INTERVIEW ................................ ..... 4
DUPLICATE THE NOISE AND TEST DRIVE .. ..... 5
CHECK RELATED SERVICE BULLETINS ...... ..... 5
LOCATE THE NOISE AND IDENTIFY THE
ROOT CAUSE ................................................. ..... 5
REPAIR THE CAUSE ...................................... ..... 5
CONFIRM THE REPAIR .................................. ..... 6
Generic Squeak and Rattle Troubleshooting ...... ..... 6
INSTRUMENT PANEL ..................................... ..... 6
CENTER CONSOLE ........................................ ..... 6
DOORS ............................................................ ..... 6
TRUNK ............................................................. ..... 7
SUNROOF/HEADLINING ................................ ..... 7
OVERHEAD CONSOLE (FRONT AND REAR) ..... 7
SEATS .............................................................. ..... 7UNDERHOOD ..................................................
..... 7
Diagnostic Worksheet .......................................... ..... 8
INSTRUMENT PANEL ASSEMBLY ...................... ... 10
Removal and Installation ..................................... ... 10
REMOVAL ........................................................ ... 11
INSTALLATION ................................................ ... 11
CLUSTER LID C .............................................. ... 12
CLUSTER LID D .............................................. ... 12
INSTRUMENT LOWER COVER LH ................ ... 13
COMBINATION METER ................................... ... 13
A/T FINISHER .................................................. ... 13
Lower Instrument Panel RH and Glove Box ........ ... 14
REMOVAL AND INSTALLATION ..................... ... 14
Glove Box ............................................................ ... 15
DISASSEMBLY AND ASSEMBLY .................... ... 15
Center Console ....................................................... 16 REMOVAL AND INSTALLATION ..................... ... 16
Center Console ....................................................... 17 DISASSEMBLY AND ASSEMBLY .................... ... 17
ASSEMBLY ...................................................... ... 17
Rear Console .......................................................... 18 REMOVAL AND INSTALLATION ..................... ... 18
Rear Console .......................................................... 19 DISASSEMBLY AND ASSEMBLY .................... ... 19

SQUEAK AND RATTLE TROUBLE DIAGNOSISIP-7
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Revision: November 2009 2006 QX56
Tapping or moving the components or pressing on them while driving to duplicate the conditions can isolate
many of these incidents. You can usually insulate the areas with felt cloth tape or insulator foam blocks from
the NISSAN Squeak and Rattle Kit (J-43980) to repair the noise.
TRUNK
Trunk noises are often caused by a loose jack or loose items put into the trunk by the owner.
In addition look for:
1. Trunk lid bumpers out of adjustment
2. Trunk lid striker out of adjustment
3. The trunk lid torsion bars knocking together
4. A loose license plate or bracket
Most of these incidents can be repaired by adjusting, securing or insulating the item(s) or component(s) caus-
ing the noise.
SUNROOF/HEADLINING
Noises in the sunroof/headlining area can often be traced to one of the following:
1. Sunroof lid, rail, linkage or seals making a rattle or light knocking noise
2. Sun visor shaft shaking in the holder
3. Front or rear windshield touching headliner and squeaking
Again, pressing on the components to stop the noise while duplicating the conditions can isolate most of these
incidents. Repairs usually consist of insulating with felt cloth tape.
OVERHEAD CONSOLE (FRONT AND REAR)
Overhead console noises are often caused by the console panel clips not being engaged correctly. Most of
these incidents are repaired by pushing up on the console at the clip locations until the clips engage.
In addition look for:
1. Loose harness or harness connectors.
2. Front console map/reading lamp lens loose.
3. Loose screws at console attachment points.
SEATS
When isolating seat noise it's important to note the position the seat is in and the load placed on the seat when
the noise is present. These conditions should be duplicated when verifying and isolating the cause of the
noise.
Cause of seat noise include:
1. Headrest rods and holder
2. A squeak between the seat pad cushion and frame
3. The rearseat back lock and bracket
These noises can be isolated by moving or pressing on the suspected components while duplicating the con-
ditions under which the noise occurs. Most of these incidents can be repaired by repositioning the component
or applying urethane tape to the contact area.
UNDERHOOD
Some interior noise may be caused by components under the hood or on the engine wall. The noise is then
transmitted into the passenger compartment.
Causes of transmitted underhood noise include:
1. Any component mounted to the engine wall
2. Components that pass through the engine wall
3. Engine wall mounts and connectors
4. Loose radiator mounting pins
5. Hood bumpers out of adjustment
6. Hood striker out of adjustment
These noises can be difficult to isolate since they cannot be reached from the interior of the vehicle. The best
method is to secure, move or insulate one component at a time and test drive the vehicle. Also, engine RPM
or load can be changed to isolate the noise. Repairs can usually be made by moving, adjusting, securing, or
insulating the component causing the noise.

INSTRUMENT PANEL ASSEMBLYIP-17
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Revision: November 2009 2006 QX56
Removal
1. Move front seats forward.
2. Disconnect battery negative terminal.
3. Remove control device. Refer to AT- 2 2 6 , "
Control Device Removal and Installation" .
4. Remove glove box assembly. Refer to IP-14, "
Lower Instrument Panel RH and Glove Box" .
5. Remove center console lower cover RH.
6. Remove console cover RH screws.
7. Remove center console lower cover LH.
8. Remove console cover LH screws.
9. Disconnect center console electrical connectors.
10. Remove center console assembly in a rearward direction.
Installation
Installation is in the reverse order of removal.
Center ConsoleEIS007X7
DISASSEMBLY AND ASSEMBLY
Disassembly
1. Remove mats from storage compartment and console bin.
2. Remove latch from console lid and remove key cylinder from latch.
3. Remove console lid.
4. Remove console bin.
5. Disconnect electrical harness from DVD player (if equipped).
6. Remove hinge.
7. Remove rear upper finisher.
8. Remove rear cup holder assembly.
9. Remove rear finisher assembly.
10. Disconnect rear finisher assembly electrical connectors.
11. Remove console power socket.
12. Remove upper side finishers LH/RH.
13. Remove heat duct and console rear duct.
14. Disconnect clips and remove console covers LH/RH.
15. Remove mask and storage compartment.
16. Remove console front bracket.
17. Remove console rear bracket.
ASSEMBLY
Assembly is in the reverse order of disassembly.
1. Console lid assembly 2. A/T finisher 3. Tray
4. Storage compartment 5. Storage compartment mask 6. Console reinforcement assembly
7. Center console lower cover LH 8. Console front bracket 9. Lower side finisher LH
10. Console cover LH 11. Rear console duct 12. Power socket assembly
13. Rear cup holder assembly 14. Rear finisher assembly 15. Console rear bracket
16. Heat duct 17. Rear upper finisher 18. Console bin mat
19. Console bin 20. Console cover RH 21. Center console lower cover RH
22. Lower side finisher RH 23. A/T transmission control 24. Mask
25. Cup holder insert

GENERAL MAINTENANCEMA-5
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Revision: November 2009 2006 QX56
GENERAL MAINTENANCEPFP:00000
General MaintenanceELS001BI
General maintenance includes those items which should be checked during the normal day-to-day operation
of the vehicle. They are essential if the vehicle is to continue operating properly. The owner can perform these
checks and inspections or have their INFINITI dealers perform them.
OUTSIDE THE VEHICLE
The maintenance items listed here should be performed from time to time, unless otherwise specified.
INSIDE THE VEHICLE
The maintenance items listed here should be checked on a regular basis, such as when performing periodic maintenance, cleaning the
vehicle, etc. Item
Reference page
Tires Check the pressure with a gauge at least once a month and always prior to a
long distance trip. Adjust to the specified pressure if necessary. Check carefully
for damage, cuts or excessive wear. —
Wheel lug nuts When checking the tires, make sure no nuts are missing, and check for any
loose nuts. Tighten if necessary. WT-7, "
Rotation"
Windshield
Clean the windshield on a regular basis. Check the windshield at least every six
months for cracks or other damage. Repair as necessary. —
Tire rotation Tires should be rotated every 12,000 km (7,500 miles). WT-7, "
Rotation"
Wheel alignment and
balanceIf the vehicle pulls to either side while driving on a straight and level road, or if
you detect uneven or abnormal tire wear, there may be a need for wheel align-
ment. If the steering wheel or seat vibrates at normal highway speeds, wheel
balancing may be needed. WT-6, "Balancing
Wheels", FSU-6, "Front
Wheel Alignment"
Windshield wiper
blades
Check for cracks or wear if they do not wipe properly.
—
Doors and engine
hood Check that all doors and the engine hood operate smoothly as well as the back
hatch. Also make sure that all latches lock securely. Lubricate if necessary.
Make sure that the secondary latch keeps the hood from opening when the pri-
mary latch is released.
When driving in areas using road salt or other corrosive materials, check lubri-
cation frequently. MA-31, "
Lubricating
Locks, Hinges and Hood
Latches"
Lamps
Make sure that the head lamps, stop lamps, tail lamps, turn signal lamps, and
other lamps are all operating properly and installed securely. Also check head
lamp aim. Clean the head lamps on a regular basis. LT-29, "Aiming Adjust-
ment" for US, LT-46,
"Aiming Adjustment" for
Canada
Item Reference page
Warning lamps and
buzzers/chimes Make sure that all warning lamps and buzzers/chimes are operating properly.
DI-25, "
Electrical Com-
ponents Inspection"
Windshield wiper and
washerCheck that the wipers and washer operate properly and that the wipers do not
streak.
—
Windshield defroster Check that the air comes out of the defroster outlets properly and in sufficient
quantity when operating the heater or air conditioner. —
Steering wheel Check that it has the specified play. Be sure to check for changes in the steering
condition, such as excessive play, hard steering or strange noises. PS-7, "
CHECKING
STEERING WHEEL
PLAY"
Seats
Check seat position controls such as seat adjusters, seat back recliner, etc. to
make sure they operate smoothly and that all latches lock securely in every
position. Check that the head restraints move up and down smoothly and that
the locks (if equipped) hold securely in all latched positions. Check that the
latches lock securely for folding-down rear seat backs. —
Seat belts Check that all parts of the seat belt system (e.g. buckles, anchors, adjusters and
retractors) operate properly and smoothly and are installed securely. Check the
belt webbing for cuts, fraying, wear or damage. SB-11, "
Seat Belt
Inspection", MA-32,
"Checking Seat Belts,
Buckles, Retractors,
Anchors and Adjusters"
Accelerator pedal
Check the pedal for smooth operation. Keep the floor mats away from the pedal. —

RF-1
ROOF
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CONTENTS
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SECTION
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RF
Revision: November 2009 2006 QX56
PRECAUTIONS .....................................................
..... 2
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” ............................................................. ..... 2
Precautions ......................................................... ..... 2
PREPARATION ...................................................... ..... 3
Special Service Tool ............................................ ..... 3
Commercial Service Tool .................................... ..... 3
SQUEAK AND RATTLE TROUBLE DIAGNOSES ..... 4
Work Flow ................................................................ 4 CUSTOMER INTERVIEW ................................ ..... 4
DUPLICATE THE NOISE AND TEST DRIVE .. ..... 5
CHECK RELATED SERVICE BULLETINS ...... ..... 5
LOCATE THE NOISE AND IDENTIFY THE
ROOT CAUSE ................................................. ..... 5
REPAIR THE CAUSE ...................................... ..... 5
CONFIRM THE REPAIR .................................. ..... 6
Generic Squeak and Rattle Troubleshooting ...... ..... 6
INSTRUMENT PANEL ..................................... ..... 6
CENTER CONSOLE ........................................ ..... 6
DOORS ............................................................ ..... 6
TRUNK ............................................................. ..... 7
SUNROOF/HEADLINING ................................ ..... 7
OVERHEAD CONSOLE (FRONT AND REAR) ..... 7
SEATS .............................................................. ..... 7
UNDERHOOD .................................................. ..... 7
Diagnostic Worksheet ......................................... ..... 8
SUNROOF ............................................................. ... 10
Component Parts and Harness Connector Location ... 10
System Description ............................................. ... 10
OUTLINE .......................................................... ... 10
OPERATION .................................................... ... 10RETAINED POWER OPERATION ...................
... 11
MEMORY RESET PROCEDURE .................... ... 11
INTERRUPTION DETECTION FUNCTION ..... ... 11
CAN Communication System Description ........... ... 12
Wiring Diagram — SROOF — ................................ 13
Terminals and Reference Values for BCM ........... ... 15
Terminals and Reference Values for Sunroof Motor
Assembly ............................................................. ... 15
Work Flow ............................................................... 15
CONSULT-II Function (BCM) .............................. ... 16
CONSULT-II OPERATION ................................ ... 16
Work Support ....................................................... ... 17
Active Test .............................................................. 17
Data Monitor ........................................................... 17
Trouble Diagnosis Chart by Symptom ................. ... 17
BCM Power Supply and Ground Circuit Check ... ... 18
Sunroof Switch System Check ............................ ... 19
Sunroof Motor Assembly Power Supply and Ground
Circuit Check ....................................................... ... 20
Door Switch Check ................................................. 21
Fitting Adjustment ................................................ ... 23
GAP ADJUSTMENT ......................................... ... 23
HEIGHT DIFFERENCE ADJUSTMENT ........... ... 24
Removal and Installation ..................................... ... 24
SUNROOF UNIT .............................................. ... 26
GLASS LID ASSEMBLY ................................... ... 26
WIND DEFLECTOR ......................................... ... 27
SUNSHADE ASSEMBLY .................................... 27
SUNROOF MOTOR ASSEMBLY ..................... ... 27
DRAIN HOSES ................................................. ... 28
WEATHERSTRIP ............................................. ... 29
LINK AND WIRE ASSEMBLY .......................... ... 29

SQUEAK AND RATTLE TROUBLE DIAGNOSESRF-7
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Revision: November 2009 2006 QX56
TRUNK
Trunk noises are often caused by a loose jack or loose items put into the trunk by the owner.
In addition look for:
1. Trunk lid bumpers out of adjustment
2. Trunk lid striker out of adjustment
3. The trunk lid torsion bars knocking together
4. A loose license plate or bracket
Most of these incidents can be repaired by adjusting, securing or insulating the item(s) or component(s) caus-
ing the noise.
SUNROOF/HEADLINING
Noises in the sunroof/headlining area can often be traced to one of the following:
1. Sunroof lid, rail, linkage or seals making a rattle or light knocking noise
2. Sun visor shaft shaking in the holder
3. Front or rear windshield touching headliner and squeaking
Again, pressing on the components to stop the noise while duplicating the conditions can isolate most of these
incidents. Repairs usually consist of insulating with felt cloth tape.
OVERHEAD CONSOLE (FRONT AND REAR)
Overhead console noises are often caused by the console panel clips not being engaged correctly. Most of
these incidents are repaired by pushing up on the console at the clip locations until the clips engage.
In addition look for:
1. Loose harness or harness connectors.
2. Front console map/reading lamp lens loose.
3. Loose screws at console attachment points.
SEATS
When isolating seat noise it's important to note the position the seat is in and the load placed on the seat when
the noise is present. These conditions should be duplicated when verifying and isolating the cause of the
noise.
Cause of seat noise include:
1. Headrest rods and holder
2. A squeak between the seat pad cushion and frame
3. The rear seatback lock and bracket
These noises can be isolated by moving or pressing on the suspected components while duplicating the con-
ditions under which the noise occurs. Most of these incidents can be repaired by repositioning the component
or applying urethane tape to the contact area.
UNDERHOOD
Some interior noise may be caused by components under the hood or on the engine wall. The noise is then
transmitted into the passenger compartment.
Causes of transmitted underhood noise include:
1. Any component installed to the engine wall
2. Components that pass through the engine wall
3. Engine wall mounts and connectors
4. Loose radiator installation pins
5. Hood bumpers out of adjustment
6. Hood striker out of adjustment
These noises can be difficult to isolate since they cannot be reached from the interior of the vehicle. The best
method is to secure, move or insulate one component at a time and test drive the vehicle. Also, engine RPM
or load can be changed to isolate the noise. Repairs can usually be made by moving, adjusting, securing, or
insulating the component causing the noise.