2009 INFINITI QX56 tow

EM-32
< ON-VEHICLE REPAIR >
EXHAUST MANIFOLD AND THREE WAY CATALYST
• Install new exhaust manifold gasket with the top of the triangularup mark on it facing up and its coated face (gray side) toward the
exhaust manifold side.
• Tighten the exhaust manifold nuts LH and RH in the numerical order shown. Then recheck the torque of the nuts.
- A: Exhaust manifold (LH)
- B: Exhaust manifold (RH)
- : Front
• Before installing new air fuel ration A/F sensors, clean the exhaust system threads using suitable tool and
apply anti-seize lubricant.
CAUTION:
• Do not over tighten the air fuel ratio A/F se nsors. Doing so may cause damage to the sensor,
resulting in the MIL coming on.
KBIA2553E
AWBIA0814ZZ
Oxygen sensor thread cleaner : (J-43897-12)
Oxygen sensor thread cleaner : (J-43897-18)
Revision: December 20092009 QX56

EXL-1
DRIVER CONTROLS
C
DE
F
G H
I
J
K
M
SECTION EXL
A
B
EXL
N
O P
CONTENTS
EXTERIOR LIGHTING SYSTEM
BASIC INSPECTION ....... .............................4
DIAGNOSIS AND REPAIR WORKFLOW ..... .....4
Work Flow ........................................................... ......4
FUNCTION DIAGNOSIS ...............................7
HEADLAMP .................................................... .....7
System Diagram .................................................. ......7
System Description ...................................................7
Component Parts Location ........................................7
Component Description .............................................7
DAYTIME LIGHT SYSTEM .................................9
System Diagram .................................................. ......9
System Description ...................................................9
Component Parts Location ........................................9
Component Description ...........................................10
AUTO LIGHT SYSTEM ......................................11
System Diagram ......................................................11
System Description .................................................11
Component Parts Location ......................................12
Component Description ...........................................12
HEADLAMP AIMING SYSTEM (MANUAL) .......13
System Diagram .................................................. ....13
System Description .................................................13
Component Parts Location ......................................13
Component Description ...........................................13
FRONT FOG LAMP ............................................14
System Diagram .................................................. ....14
System Description .................................................14
Component Parts Location ......................................14
Component Description ...........................................14
TURN SIGNAL AND HAZARD WARNING
LAMPS ...............................................................
15
System Diagram .................................................. ....15
System Description .................................................15
Component Parts Location ......................................15
Component Description ....................................... ....16
PARKING, LICENSE PLATE AND TAIL
LAMPS ..............................................................
17
System Diagram ......................................................17
System Description ..................................................17
Component Parts Location ......................................17
Component Description ...........................................18
TRAILER TOW ..................................................19
System Diagram ......................................................19
System Description ..................................................19
Component Parts Location ......................................20
Component Description ...........................................20
DIAGNOSIS SYSTEM (BCM) ...........................22
HEADLAMP ........................................................... ....22
HEADLAMP : CONSULT-III Function (BCM -
HEAD LAMP) ...........................................................
22
FLASHER ............................................................... ....23
FLASHER : CONSULT-III Function (BCM -
FLASHER) ...............................................................
23
COMB SW .............................................................. ....23
COMB SW : CONSULT-III Function (BCM -
COMB SW) ..............................................................
23
DIAGNOSIS SYSTEM (IPDM E/R) ...................25
Diagnosis Description ..............................................25
CONSULT - III Function (IPDM E/R) .......................27
COMPONENT DIAGNOSIS .........................30
POWER SUPPLY AND GROUND CIRCUIT ....30
BCM (BODY CONTROL MODULE) ...................... ....30
BCM (BODY CONTROL MODULE) : Diagnosis
Procedure ............................................................ ....
30
IPDM E/R (INTELLIGENT POWER DISTRIBU-
TION MODULE ENGINE ROOM) .......................... ....
31
Revision: December 20092009 QX56

EXL-2
IPDM E/R (INTELLIGENT POWER DISTRIBU-
TION MODULE ENGINE ROOM) : Diagnosis Pro-
cedure .....................................................................
31
HEADLAMP (HI) CIRCUIT ................................32
Description ........................................................... ...32
Component Function Check ...................................32
Diagnosis Procedure - Without Daytime Light Sys-
tem ..........................................................................
32
Diagnosis Procedure - With Daytime Light System
...
33
HEADLAMP (LO) CIRCUIT ...............................35
Description ........................................................... ...35
Component Function Check ...................................35
Diagnosis Procedure - Without Daytime Light Sys-
tem ..........................................................................
35
Diagnosis Procedure - With Daytime Light System
...
36
FRONT FOG LAMP CIRCUIT ...........................38
Description ........................................................... ...38
Component Function Check ...................................38
Diagnosis Procedure ..............................................38
PARKING LAMP CIRCUIT ................................40
Description ........................................................... ...40
Component Function Check ...................................40
Diagnosis Procedure - Without Daytime Light Sys-
tem ..........................................................................
40
Diagnosis Procedure - With Daytime Light System
...
42
TURN SIGNAL LAMP CIRCUIT ........................46
Description ........................................................... ...46
Component Function Check ...................................46
Diagnosis Procedure ..............................................46
OPTICAL SENSOR ...........................................49
Description ..............................................................49
Component Function Check ...................................49
Diagnosis Procedure ..............................................49
HEADLAMP AIMING SWITCH ..........................51
Description ........................................................... ...51
Diagnosis Procedure - Without Daytime Light Sys-
tem ..........................................................................
51
Diagnosis Procedure - With Daytime Light System
...
52
HEADLAMP .......................................................53
Wiring Diagram .................................................... ...53
DAYTIME LIGHT SYSTEM ................................57
Wiring Diagram .................................................... ...57
AUTO LIGHT SYSTEM ......................................64
Wiring Diagram .................................................... ...64
HEADLAMP AIMING SYSTEM (MANUAL) ......71
Wiring Diagram .................................................... ...71
FRONT FOG LAMP SYSTEM ...........................75
Wiring Diagram .................................................... ...75
TURN SIGNAL AND HAZARD WARNING
LAMP SYSTEM .............................................. ...
78
Wiring Diagram .................................................... ...78
PARKING, LICENSE PLATE AND TAIL
LAMPS SYSTEM ...............................................
85
Wiring Diagram .................................................... ...85
STOP LAMP ......................................................91
Wiring Diagram .................................................... ...91
BACK-UP LAMP ............................................ ...95
Wiring Diagram .................................................... ...95
TRAILER TOW .................................................100
Wiring Diagram .....................................................100
ECU DIAGNOSIS ......................................106
BCM (BODY CONTROL MODULE) ............... ..106
Reference Value .................................................. .106
Terminal Layout ....................................................108
Physical Values .....................................................108
Wiring Diagram .....................................................114
Fail Safe ...............................................................118
DTC Inspection Priority Chart .............................119
DTC Index ............................................................119
IPDM E/R (INTELLIGENT POWER DISTRI-
BUTION MODULE ENGINE ROOM) ................
121
Reference Value .................................................. .121
Terminal Layout ....................................................123
Physical Values .....................................................123
Wiring Diagram .....................................................128
Fail Safe ...............................................................131
DTC Index ............................................................133
SYMPTOM DIAGNOSIS ...........................134
EXTERIOR LIGHTING SYSTEM SYMPTOMS ..134
Symptom Table .................................................... .134
NORMAL OPERATING CONDITION ...............136
Description ........................................................... .136
BOTH SIDE HEADLAMPS DO NOT SWITCH
TO HIGH BEAM ................................................
137
Description ........................................................... .137
Diagnosis Procedure .............................................137
BOTH SIDE HEADLAMPS (LO) ARE NOT
TURNED ON .....................................................
138
Description ............................................................138
Diagnosis Procedure .............................................138
PARKING, LICENSE PLATE AND TAIL
LAMPS ARE NOT TURNED ON ......................
139
Description ........................................................... .139
Revision: December 20092009 QX56

EXL-8
< FUNCTION DIAGNOSIS >
HEADLAMP
A Xenon type headlamp is adapted to the low beam headlamps. Xenon bulbs do not use a filament. Instead,
they produce light when a high voltage current is pa ssed between two tungsten electrodes through a mixture
of Xenon (an inert gas) and certain other metal halides. In addition to added lighting power, electronic control
of the power supply gives the headlamps stable quality and tone color. Following are some of the advantages
of the Xenon type headlamp.
• The light produced by the headlamps is a white color comparable to sunlight that is easy on the eyes.
• Light output is nearly double that of halogen headlamps, affording increased area of illumination.
• The light features a high relative spectral distribution at wavelengths to which the human eye is most sensi- tive. This means that even in the rain, more light is reflected back from the road surface toward the vehicle,
for added visibility.
• Power consumption is approximately 25 percent less than halogen headlamps, reducing battery load.
HIGH BEAM OPERATION/FLASH-TO-PASS OPERATION
With the combination switch (lighting and turn signal switch) in the 2ND position and placed in HIGH position,
the BCM receives input requesting the headlamp high beams to illuminate. The flash to pass feature can be
used any time and also sends a signal to the BCM. This input is communicated to the IPDM E/R via the CAN
communication lines. The CPU of the combination meter c ontrols the ON/OFF status off the HIGH BEAM indi-
cator. The CPU of the IPDM E/R controls the headlamp LH high and RH high relay coils which supplies power
to the high beam headlamps.
The combination meter receives a high beam request signal (ON) via the CAN communication lines and turns
the high beam indicator lamp ON.
Revision: December 20092009 QX56

TRAILER TOWEXL-19
< FUNCTION DIAGNOSIS >
C
DE
F
G H
I
J
K
M A
B
EXL
N
O P
TRAILER TOW
System DiagramINFOID:0000000005867517
System DescriptionINFOID:0000000005867518
TRAILER TAIL LAMP OPERATION
The trailer tail lamps are controlled by the trailer tow re lay 1 located behind the left side of the instrument panel
(IP). With the combination switch in the 1st position, the BCM detects the LI GHTING SWITCH 1ST POSITION
ON. The BCM sends a parking light ON request via the CAN communication lines to the IPDM E/R. The IPDM
E/R then activates the tail lamp relay which activates t he trailer tow relay 1 and sends power to the trailer con-
nector.
TRAILER TURN SIGNAL LAMP OPERATION
The trailer turn signal lamps are controlled by the BCM. When the turn signal switch is in the LH or RH position
with the ignition switch ON, the combination switch sends a signal to the BCM. The BCM detects the TURN
RH or TURN LH ON request. The BCM sends a control signal to the respective trailer turn relay which sends
power to the trailer connector.
TRAILER HAZARD LAMP OPERATION
The trailer hazard lamps are controlled by the BCM. When the hazard switch is pressed, the BCM detects the
the hazard ON request. The BCM then sends a control signal to both trailer turn relays which sends power to
the trailer connector.
TRAILER BRAKE LAMP OPERATION
The trailer brake lamps are controlled by the BCM. W hen the brake pedal is depressed, the combination meter
receives a stop lamp switch signal from the stop lamp switch. The combination meter then sends the brake
signal to the BCM via the CAN communication lines. The BCM then sends a control signal to both trailer turn
relays which sends power to the trailer connector.
AWLIA1764GB
Revision: December 20092009 QX56

EXL-20
< FUNCTION DIAGNOSIS >
TRAILER TOW
Component Parts Location
INFOID:0000000005867519
Component DescriptionINFOID:0000000005867520
1. BCM M18, M19, M20 (view with instru- ment panel removed) 2. IPDM E/R E119, E122, E123, E124 3. Combination meter M24, M25
4. Combination switch (lighting and turn signal switch) M28 5. Trailer tow relay 1 M51 (view with
steering member removed) 6. Battery
7. Trailer turn relay LH E156 8. Trailer turn relay RH E157 9. Trailer tow relay 2 E140
10. Stop lamp switch E38 (column shift), E42 (floor shift)
AWLIA1772ZZ
Part name Description
BCM • Receives lighting and turn signal requests from combination
switch.
• Receives stop lamp signal requests from combination meter via CAN communication.
• Sends lighting signal request to the IPDM E/R to control the tail lamp relay via CAN communication.
• Sends turn/hazard/brake control signal to the trailer turn relays.
IPDM E/R Activates the tail lamp relay upon request from the BCM via CAN
communication.
Revision: December 20092009 QX56

TRAILER TOWEXL-21
< FUNCTION DIAGNOSIS >
C
DE
F
G H
I
J
K
M A
B
EXL
N
O P
Combination meter • Receives stop lamp switch signal from stop lamp switch.
• Sends stop lamp signal request to the BCM via CAN communi-
cation.
Combination switch (lighting and turn signal switch) Outputs lighting and turn signal requests to the BCM.
Revision: December 20092009 QX56

EXL-100
< COMPONENT DIAGNOSIS >
TRAILER TOW
TRAILER TOW
Wiring DiagramINFOID:0000000003776207
AALWA0200GB
Revision: December 20092009 QX56