2006 INFINITI QX56 sunroof

HEADLININGEI-39
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Revision: November 2009 2006 QX56
CAUTION:
Disconnect both terminals from battery in advance.
REMOVAL
1. Disconnect the battery negative and positive cables, then wait at least 3 minutes.
2. Remove body side trim. Refer to EI-35, "
BODY SIDE TRIM" .
3. Remove luggage floor trim. Refer to EI-40, "
LUGGAGE FLOOR TRIM" .
4. Remove sunvisor assemblies.
5. Remove sunvisor clips.
6. Remove sunroof welt (if equipped).
7. Remove front roof console.

Disconnect harnesses.
8. Remove rear roof console.

Disconnect harnesses.
9. Remove assist grips.
10. Remove lamp assembly and rear roof finisher.

Disconnect harness.
11. Remove headlining.

Remove clips from rear of headlining.

Disconnect harnesses.
12. Remove rear air control.

Disconnect harness.
13. Remove rear audio control assembly.

Disconnect harness.
14. Remove lamp assemblies.

Disconnect harnesses.
15. Remove air vents.
16. Remove the front roof console bracket.
17. Remove rear roof console front bracket.
18. Remove assist grip brackets from roof.
INSTALLATION
Installation is in the reverse order of removal.
1. Headlining (without sunroof) 2. Assist grip bracket 3. Assist grip
4. Sunvisor assembly LH 5. Cap LH 6. Sunvisor holder
7. Front roof console 8. Sunglass bin9. Sunroof welt
10. Cap RH 11. Sunvisor assembly RH12. Rear roof console bracket
13. Rear storage bin or DVD display 14. Rear air control 15. Rear audio control assembly
16. Rear roof console 17. Rear roof console finisher18. Rear storage bin
19. Air vent 20. Lamp assembly21. Plastic clip
22. Headlining (with sunroof) 23. Rear lamp lens24. Rear lamp
25. Rear roof finisher 26. Plastic clip27. Metal clip

GW-1
GLASSES, WINDOW SYSTEM & MIRRORS
I BODY
CONTENTS
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Revision: November 2009 2006 QX56
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.

GW-34
POWER WINDOW SYSTEM
Revision: November 20092006 QX56
4. Touch “BCM”.
If “BCM ” is not indicated, refer to GI-40, "
CONSULT-II Data Link
Connector (DLC) Circuit" .
5. Touch “RETAINED PWR ”.
6. Select diagnosis mode. “ACTIVE TEST ”, “WORK SUPPORT ” and "DATA MONITOR"
are available.
ACTIVE TEST
WORK SUPPORT
DATA MONITOR
BCIA0030E
LIIA0163E
BCIA0031E
Test Item Description
RETAINED PWR This test is able to supply RAP signal (power) from BCM (body control module) to power window
system and power sunroof system (if equipped). Those systems can be operated when turning on
“
RETAINED PWR ” on CONSULT-II screen even if the ignition switch is turned OFF.
NOTE:
During this test, CONSULT-II can be operated with ignition switch in OFF position. “ RETAINED
PWR ” should be turned “ ON” or “OFF ” on CONSULT-II screen when ignition switch is ON. Then
turn ignition switch OFF to check retained power operation. CONSULT-II might be stuck if
“ RETAINED PWR ” is turned “ON ” or “OFF ” on CONSULT-II screen when ignition switch is OFF.
Work item Description
RETAINED PWR RAP signal
’s power supply period can be changed by mode setting. Selects RAP signal ’s power
supply period between three steps

MODE1 (45 sec.) / MODE2 (OFF) / MODE 3 (2 min.).
Work item Description
IGN ON SW Indicates (ON / OFF) condition of ignition switch

IDX-4
ALPHABETICAL INDEX
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ECM input/output signal ..................... EC-105
, EC-129
ECM power supply ............................. EC-145, EC-453
ECM relay ........................................................ EC-145
ECM/PW - Wiring diagram ............................... EC-454
ECTS - Wiring diagram .................................... EC-194
Electric sunroof .................................................. RF-10
Electric throttle control actuator ......... EC-534, EC-545
Electrical load signal circuit .............................. EC-596
Electrical units location ...................................... PG-65
Electronic ignition (EI) system ........................... EC-26
Engine control circuit diagram ......................... EC-103
Engine control component parts location ........... EC-96
Engine control module (ECM) .......................... EC-457
Engine control system diagram ......................... EC-23
Engine coolant .................................................. CO-10
Engine coolant temperature sensor (ECTS) ... EC-192,
EC-205
Engine fail-safe system ...................................... EC-91
Engine oil ............................................................. LU-7
Engine oil filter replacement ............................. MA-17
Engine oil precautions .......................................... GI-7
Engine oil replacement ..................................... MA-17
Engine removal ................................................. EM-74
Engine room cover ............................................ EM-12
Engine serial number .......................................... GI-49
ETC1 - Wiring diagram .................................... EC-535
ETC2 - Wiring diagram .................................... EC-530
ETC3 - Wiring diagram .................................... EC-541
EVAP canister .................................................... EC-35
EVAP canister purge volume control solenoid valve ....
EC-373
, EC-381
EVAP canister vent control valve ....... EC-388, EC-395
EVAP control system (small leak) diagnosis .. EC-365,
EC-419
, EC-427
EVAP control system pressure sensor .... EC-402, EC-
405, EC-411
EVAP control system purge flow monitoring diagnosis
EC-360
EVAP vapor lines inspection ............................. MA-20
Evaporative emission (EVAP) system ............... EC-32
Evaporator ..................................................... ATC-184
Exhaust manifold .............................................. EM-21
Exhaust system ................................................... EX-3
Exhaust system inspection .................................. EX-3
Expansion valve ............................................. ATC-186
F
F/FOG - Wiring diagram ..................................... LT-71
F/PUMP - Wiring diagram ................................ EC-605
Final drive pre-inspection ................................. FFD-15
Final drive removal and installation .. FFD-12, RFD-13
Flow charts ......................................................... GI-28
Fluid temperature sensor (A/T) ........................ AT-127
Fluids ................................................................ MA-11
Fluorescent leak detector .............................. ATC-187
Fog lamp, front .................................................... LT-69
Fog lamp, front, removal and installation ........... LT-79
Foot lamp ......................................................... LT-135
Freeze frame data ............................... EC-53, EC-118
Front brake solenoid valve ................. AT-143, AT-145
Front bumper ...................................................... EI-13
Front case (Transfer) .......................... TF-149, TF-176
Front combination lamp removal and installation LT-31
Front door ............................. BL-128, BL-131, GW-65
Front Door Trim ................................................... EI-32
Front drive shaft (Transfer) ................. TF-149, TF-176
Front fog lamp .................................................... LT-69
Front fog lamp removal and installation ............. LT-79
Front passenger air bag .................................. SRS-50
Front seat ........................................................... SE-91
Front seat belt ...................................................... SB-3
Front seat belt pre-tensioner ............... SRS-3, SRS-57
Front washer ...................................................... WW-4
Front wiper ......................................................... WW-4
FTS - Wiring diagram ....................................... AT-128
FTTS - Wiring diagram ...................... EC-311, EC-316
Fuel cut control (at no load high engine speed) EC-27
Fuel filter replacement ......................................... FL-6
Fuel gauge ............................................................ DI-5
Fuel injection system (Bank 1) .......... EC-288, EC-299
Fuel injection system (Bank 2) .......... EC-288, EC-299
Fuel injector .................................................... EC-598
Fuel injector and fuel tube ................................. EM-31
Fuel level sensor ................. EC-436, EC-438, EC-440
Fuel line inspection .............................................. FL-4
Fuel precautions ................................................... GI-5
Fuel pressure check .......................................... EC-80
Fuel pressure release ....................................... EC-80
Fuel pump ....................................................... EC-604
Fuel pump and gauge .......................................... FL-6
Fuel system .......................................................... FL-4
Fuel tank ............................................................ FL-10
Fuel tank temperature sensor ........... EC-309, EC-315
Fuel tank vacuum relief valve ........................... EC-35
FUELB1 - Wiring diagram ................. EC-290, EC-301
FUELB2 - Wiring diagram ................. EC-292, EC-303
Fuse ...................................................... PG-17, PG-77
Fuse and fusible link box .................................. PG-77
Fuse block ......................................................... PG-76
Fusible link ............................................ PG-17, PG-77
G
Garage jack and safety stand ............................. GI-41
Gauges ................................................................. DI-5
Generator .......................................................... SC-17
Generic scan tool (GST) ................................. EC-127
Glass ...................................... GW-11, GW-65, GW-68
Glove box lamp ................................................ LT-158
GPS antenna ..................................................... AV-85
Grease .............................................................. MA-11
Ground distribution ............................................ PG-31

IDX-7
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ALPHABETICAL INDEX
Rear combination lamp removal and installation ... LT-
125
Rear cover packing replacement diff. ..............
RFD-28
Rear door ........................................... BL-128, GW-68
Rear seat belt ...................................................... SB-6
Rear suspension ............................................. RSU-26
Rear view monitor ............................................... DI-73
Rear washer .................................................... WW-32
Rear window defogger ..................................... GW-74
Rear wiper ....................................................... WW-32
Refrigerant connection precaution .................... ATC-7
Refrigerant discharging evacuating charging ATC-171
Refrigerant general precaution .......................... ATC-6
Refrigerant lines ........... ATC-171, ATC-179, ATC-180
Refrigerant pressure sensor ............ EC-630, ATC-182
Relay box .......................................................... PG-78
Remote keyless entry system ............................ BL-44
Removal and installation (A/T) ........... AT-243, AT-246
Removal and installation (Transfer) ................. TF-145
Ring gear diff. inspection ................................. RFD-18
Road wheel size ................................................. GI-50
Rocker cover ..................................................... EM-35
Room lamp ....................................................... LT-134
Room lamp - See Interior lamp ........................ LT-134
ROOM/L - Wiring diagram ................................ LT-140
RP/SEN - Wiring diagram ............................... EC-631
S
SAE J1979 - Service $01 - 09 ........................... EC-48
SEAT - Wiring diagram ..................................... SE-83
Seat belt inspection ............................... SB-11, MA-32
Seat belt pre-tensioner .................................... SRS-57
Seat belt, front ..................................................... SB-3
Seat belt, rear ...................................................... SB-6
Seat, front .......................................................... SE-91
Self-diagnosis (Transfer) .................................... TF-50
SEN/PW - Wiring diagram ............................... EC-461
SHIFT - Wiring diagram ................................... AT-222
Shift control (Transfer) ....................... TF-149, TF-176
Shift lock system .............................................. AT-221
Shock absorber (front) .................................... FSU-11
Shock absorber (rear) ..................................... RSU-35
Side air bag (satellite) sensor .......................... SRS-56
Side curtain air bag ......................................... SRS-53
Side trim .............................................................. EI-35
SMJ (super multiple junction) ............................ PG-74
SONAR - Wiring diagram .................................... DI-63
Spare tire size .................................................... GI-50
Spark plug ......................................................... EM-29
Spark plug replacement .................................... MA-18
Specification value .......................................... EC-134
Speedometer ......................................................... DI-5
Spiral cable ..................................................... SRS-48
SROOF - Wiring diagram .................................. RF-13
SRS - See Supplemental Restraint System ...... SRS-5
SRS - Wiring diagram ..................................... SRS-12
SRS Trouble diagnoses .................................... SRS-8
Stabilizer bar (front) ......................................... FSU-12
Stabilizer bar (rear) ......................................... RSU-42
Stall test (A/T) .................................................... AT-51
Standardized relay ............................................. PG-72
START - Wiring diagram ................................... SC-11
Starting system .................................................. SC-10
Steering gear, linkage and transfer gear inspection .....
MA-29
Steering linkage ................................................. PS-15
Steering wheel and column ................................. PS-7
Step lamp ......................................................... LT-135
Stop lamp ......................................................... LT-106
Stop lamp switch ................. EC-511, EC-523, EC-586
STOP/L - Wiring diagram ................................. LT-107
Strut (front) ...................................................... FSU-10
STSIG - Wiring diagram .................................. AT-101
Sub-oil pump (Transfer) ...................... TF-154, TF-167
Sun gear (Transfer) ............................ TF-149, TF-176
Sun roof, electric ................................................ RF-10
Sunload sensor .............................................. ATC-140
Sunroof .............................................................. RF-24
Supplemental Restraint System ........................ SRS-5
Supplemental restraint system - Wiring diagram . SRS-
12
Symbols and abbreviations ..................... GI-10, GI-23
Symptom matrix chart ........................................ EC-92
System readiness test (SRT) code .................... EC-54
T
Tachometer .......................................................... DI-5
Tail lamp ........................................................... LT-111
TAIL/L - Wiring diagram .................................... LT-113
TCM circuit diagram .......................................... AT-50
TCM inspection table ......................................... AT-83
TCS - Wiring diagram ..................................... BRC-16
TCS (traction control system) ........................... BRC-7
TCS component parts and connector location BRC-14
TCS wheel sensors ........................................ BRC-14
Telephone .......................................................... AV-64
Theft warning system - See Vehicle security (Theft warn-
ing) system ......................................................... BL-75
Thermometer ...................................................... DI-26
Three way catalyst ............................................. EM-21
Three way catalyst function (Bank 1) .............. EC-354
Three way catalyst function (Bank 2) .............. EC-354
Three way catalyst precautions ............................ GI-5
Throttle control motor ...................................... EC-540
Throttle control motor relay .............................. EC-528
Throttle position sensor (TPS) ... EC-198, EC-320, EC-
483, EC-485, EC-560
Throttle valve closed position learning .............. EC-78
Tie-rod ............................................................... PS-15
Timing chain ...................................................... EM-37
Tire rotation ....................................................... MA-28
Tire size .............................................................. GI-50
Torque converter installation AT-244, AT-245, AT-248,
AT-249
Torque convertor clutch solenoid valve .... AT-118, AT-
120

IP-1
INSTRUMENT PANEL
I BODY
CONTENTS
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SECTION
A
B
IP
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.