brake INFINITI QX56 2006 Factory Service Manual

CAN COMMUNICATIONLAN-37
[CAN]
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Revision: November 2009 2006 QX56
Fuel level low warning signalT R
Fuel level sensor signal RT
Parking brake switch signal TR
Stop lamp switch signal RTR
Tow mode switch signal RT
Vehicle speed signal RR
RT
RRR R T RR
A/C switch/indicator signal TR
RT
A/C switch signal RTR
Blower fan motor switch signal RT
Day time running light request signal TR
Door switch signal R R R TR
Front fog light request signal TR
Front wiper request signal RT R
High beam request signal RT R
High beam status signal R T
Horn chirp signal TR
Ignition switch signal RT R
Key fob door unlock signal RT
Key fob ID signal RT
Key switch signal RT
Low beam request signal TR
Low beam status signal R T
Position light request signal RT R
Rear window defogger switch signal TR R
Sleep wake up signal R RT R
Theft warning horn request signal TR
Tire pressure data signal R T
Tire pressure signal RT
Turn indicator signal RT
Steering angle sensor signal TR
ABS malfunction signal RT
ABS warning lamp signal RT
Signals
ECM
TCM
ICC sensor
*1
ICC unit
*1
Driver seat control unit Combination meter
Display control unit BCM
Steering angle sensor Front air control
Transfer control unit
ABS actuator and electric unit (control unit) IPDM E/R

LAN-38
[CAN]
CAN COMMUNICATION
Revision: November 20092006 QX56

*1: with ICC model only
Brake pressure sensor signal
RT
Brake warning lamp signal RT
SLIP indicator lamp signal RT
TCS malfunction signal RT
VDC malfunction signal RT
VDC OFF indicator lamp signal RR T
VDC operation signal RT
Front wiper stop position signal RT
Hood switch signal RT
Rear window defogger control signal RR T
Signals
ECM
TCM
ICC sensor
*1
ICC unit
*1
Driver seat control unit Combination meter
Display control unit BCM
Steering angle sensor Front air control
Transfer control unit
ABS actuator and electric unit (control unit) IPDM E/R

LT-1
LIGHTING SYSTEM
K ELECTRICAL
CONTENTS
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PRECAUTIONS .....................................................
..... 4
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” ............................................................. ..... 4
General precautions for service operations ........ ..... 4
HEADLAMP (FOR USA) ....................................... ..... 5
Component Parts and Harness Connector Location ..... 5
System Description ............................................. ..... 5
OUTLINE .......................................................... ..... 5
XENON HEADLAMP ........................................ ..... 6
BATTERY SAVER CONTROL ......................... ..... 7
AUTO LIGHT OPERATION .............................. ..... 7
VEHICLE SECURITY SYSTEM (PANIC ALARM) ..... 7
CAN Communication System Description ........... ..... 7
Schematic ........................................................... ..... 8
Wiring Diagram — H/LAMP — ............................ ..... 9
Terminals and Reference Values for BCM .......... ... 13
Terminals and Reference Values for IPDM E/R .. ... 14
How to Proceed With Trouble Diagnosis ............. ... 14
Preliminary Check ............................................... ... 14
CHECK POWER SUPPLY AND GROUND CIR-
CUIT ................................................................. ... 14
CONSULT-II Function (BCM) .............................. ... 16
CONSULT-II OPERATION ............................... ... 16
WORK SUPPORT ............................................ ... 17
DATA MONITOR .............................................. ... 17
ACTIVE TEST .................................................. ... 18
SELF-DIAGNOSTIC RESULTS ....................... ... 18
CONSULT-II Function (IPDM E/R) ...................... ... 19
CONSULT-II OPERATION ............................... ... 19
DATA MONITOR .............................................. ... 20
ACTIVE TEST .................................................. ... 20
Headlamp HI Does Not Illuminate (Both Sides) .. ... 21
Headlamp HI Does Not Illuminate (One Side) .... ... 23
High Beam Indicator Lamp Does Not Illuminate . ... 24
Headlamp LO Does Not Illuminate (Both Sides) . ... 24
Headlamp LO Does Not Illuminate (One Side) ... ... 26
Headlamps Do Not Turn OFF ............................. ... 27
Aiming Adjustment .............................................. ... 29
HEADLAMP AIMING ........................................ ... 29Bulb Replacement ...............................................
... 30
HEADLAMP (OUTER SIDE), FOR LOW BEAM ... 30
HEADLAMP (INNER SIDE), FOR HIGH BEAM ... 31
FRONT PARKING LAMP (INNER OR OUTER) ... 31
SIDE MARKER LAMP (FRONT) ......................... 31
Removal and Installation ..................................... ... 31
FRONT COMBINATION LAMP ASSEMBLY .... ... 31
INSTALLATION ................................................ ... 32
Disassembly and Assembly ................................. ... 32
FRONT COMBINATION LAMP ASSEMBLY .... ... 32
DISASSEMBLY ................................................ ... 32
ASSEMBLY ...................................................... ... 32
HEADLAMP (FOR CANADA) - DAYTIME LIGHT
SYSTEM - ............................................................... ... 33
Component Parts and Harness Connector Location ... 33
System Description .............................................. ... 34
OUTLINE .......................................................... ... 34
DAYTIME LIGHT OPERATION ........................ ... 34
COMBINATION SWITCH READING FUNCTION ... 34
AUTO LIGHT OPERATION .............................. ... 35
CAN Communication System Description ........... ... 35
Schematic ............................................................ ... 36
Wiring Diagram — DTRL — ................................ ... 37
Terminals and Reference Values for BCM ........... ... 41
How to Proceed With Trouble Diagnosis ............. ... 42
Preliminary Check ............................................... ... 42
CHECK BCM CONFIGURATION ..................... ... 42
INSPECTION FOR POWER SUPPLY AND
GROUND CIRCUIT .......................................... ... 42
INSPECTION PARKING BRAKE SWITCH CIR-
CUIT ................................................................. ... 43
CONSULT-II Functions ........................................ ... 44
Daytime Light Control Does Not Operate Properly
(Normal Headlamps Operate Properly) ............... ... 44
Aiming Adjustment ............................................... ... 46
Bulb Replacement ............................................... ... 46
Removal and Installation ..................................... ... 46
Disassembly and Assembly ................................. ... 46
AUTO LIGHT SYSTEM .......................................... ... 47
Component Parts and Harness Connector Location ... 47

LT-3
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STOP LAMP .....................................................
. 108
Removal and Installation ..................................... . 108
HIGH_MOUNTED STOP LAMP ...................... . 108
STOP LAMP ..................................................... . 108
BACK-UP LAMP ................................................... . 109
Wiring Diagram — BACK/L — ............................ . 109
Bulb Replacement ............................................... .. 110
BACK-UP LAMP .............................................. .. 110
INSTALLATION ................................................ .. 110
Removal and Installation ..................................... .. 110
BACK-UP LAMP .............................................. .. 110
PARKING, LICENSE PLATE AND TAIL LAMPS .. .. 111
Component Parts and Harness Connector Location . . 111
System Description ............................................. . . 111
OPERATION BY LIGHTING SWITCH ............. .. 112
COMBINATION SWITCH READING FUNCTION .. 112
EXTERIOR LAMP BATTERY SAVER CONTROL .. 112
CAN Communication System Description ........... .. 112
Schematic ........................................................... .. 113
Wiring Diagram — TAIL/L — ................................. 114
Terminals and Reference Values for BCM .......... .. 117
Terminals and Reference Values for IPDM E/R .. .. 118
How to Proceed With Trouble Diagnosis ............. .. 118
Preliminary Check ............................................... .. 118
CHECK POWER SUPPLY AND GROUND CIR-
CUIT ................................................................. .. 118
CONSULT-II Functions ........................................ .. 119
Parking, License Plate and/or Tail Lamps Do Not
Illuminate ............................................................. . 120
Parking, License Plate and Tail Lamps Do Not Turn
OFF (After Approx. 10 Minutes) .......................... . 123
Bulb Replacement ............................................... . 124
FRONT PARKING LAMP ................................. . 124
LICENSE PLATE LAMP ................................... . 124
SIDE MARKER LAMP (FRONT) ...................... . 124
TAIL LAMP ....................................................... . 124
Removal and Installation ..................................... . 124
FRONT PARKING LAMP ................................. . 124
LICENSE PLATE LAMP ................................... . 124
INSTALLATION ................................................ . 124
SIDE MARKER LAMP (REAR) ........................ . 124
TAIL LAMP ....................................................... . 124
REAR COMBINATION LAMP ............................... . 125
Bulb Replacement ............................................... . 125
SIDE MARKER LAMP (REAR) ........................ . 125
TAIL LAMP ....................................................... . 125
TURN SIGNAL ................................................. . 125
STOP LAMP ..................................................... . 125
INSTALLATION ................................................ . 125
Removal and Installation ..................................... . 125
REAR COMBINATION LAMP .......................... . 125
TRAILER TOW ...................................................... . 126Component Parts and Harness Connector Location
.126
System Description .............................................. .126
TRAILER TAIL LAMP OPERATION ................. .127
TRAILER BRAKE, TURN SIGNAL AND HAZARD
LAMP OPERATION .......................................... .127
TRAILER BRAKE OPERATION ....................... .128
TRAILER POWER SUPPLY OPERATION ....... .128
Schematic ............................................................ .129
Wiring Diagram — T/TOW — .............................. .130
INTERIOR ROOM LAMP ....................................... .134
Component Parts and Harness Connector Location .134
System Description .............................................. .135
POWER SUPPLY AND GROUND ................... .135
SWITCH OPERATION ..................................... .136
ROOM LAMP TIMER OPERATION ................. .136
INTERIOR LAMP BATTERY SAVER CONTROL .137
Schematic ............................................................ .138
Wiring Diagram — INT/L — ................................. .140
Terminals and Reference Values for BCM ........... .147
How to Proceed With Trouble Diagnosis ............. .148
Preliminary Check ............................................... .148
INSPECTION FOR POWER SUPPLY AND
GROUND CIRCUIT .......................................... .148
CONSULT-II Function (BCM) .............................. .149
CONSULT-II OPERATION ................................ .149
WORK SUPPORT ............................................ .150
DATA MONITOR .............................................. .150
ACTIVE TEST .................................................. .151
Room/Map Lamp Control Does Not Operate ...... .151
Personal Lamp Control Does Not Operate (Room/
Map Lamps Operate) ........................................... .153
All Step/Foot/Puddle Lamps Do Not Operate ...... .154
All Interior Room Lamps Do Not Operate ............ .155
Ignition Keyhole Illumination Control Does Not
Operate ................................................................ .155
ILLUMINATION ...................................................... .157
Component Parts and Harness Connector Location .157
System Description .............................................. .157
ILLUMINATION OPERATION BY LIGHTING
SWITCH ........................................................... .158
EXTERIOR LAMP BATTERY SAVER CONTROL .159
CAN Communication System Description ........... .159
Schematic ............................................................ .160
Wiring Diagram — ILL — ..................................... .163
Removal and Installation of Illumination Control
Switch .................................................................. .174
REMOVAL ........................................................ .174
INSTALLATION ................................................ .174
BULB SPECIFICATIONS ....................................... .175
Headlamp ............................................................ .175
Exterior Lamp ...................................................... .175
Interior Lamp/Illumination .................................... .175

LT-34
HEADLAMP (FOR CANADA) - DAYTIME LIGHT SYSTEM -
Revision: November 20092006 QX56
System DescriptionEKS00B8E
Daytime light system turns on daytime light lamps while driving. Daytime light lamps are not turned on if
engine is activated with parking brake applied. Release parking brake to turn on daytime light lamps. The
lamps turn off when lighting switch is in the 2ND position or AUTO position (Headlamp is "ON") and when light-
ing switch is in the PASSING position. (Daytime light lamps are not turned off only by parking brake itself.)
A parking brake signal and engine run or stop signal are sent to BCM (body control module) by CAN commu-
nication line.
OUTLINE
Power is supplied at all times

to ignition relay, located in the IPDM E/R (intelligent power distribution module engine room), and

through 50A fusible link (letter f , located in the fuse and fusible link box)

to BCM terminal 70, and

through 20A fuse (No. 53, located in the IPDM E/R)

to CPU (central processing unit) of the IPDM E/R, and

through 10A fuse [No. 19, located in the fuse block (J/B)]

to combination meter terminal 8, and

through 10A fuse (No. 45, located in the IPDM E/R)

to daytime light relay terminals 2 and 5.
When the ignition switch is in ON or START position, power is supplied

to ignition relay, located in the IPDM E/R, and

through 10A fuse (No. 59, located in the fuse and relay box)

to BCM terminal 38, and

through 10A fuse [No. 14, located in the fuse block (J/B)]

to combination meter terminal 24.
Ground is supplied

to BCM terminal 67 and

to combination meter terminal 17

through grounds M57, M61 and M79.
DAYTIME LIGHT OPERATION
With the engine running, the lighting switch in the OFF or 1ST position and parking brake released, the IPDM
E/R receives input requesting the daytime lights illuminate. This input is communicated across the CAN com-
munication lines. The CPU of the IPDM E/R controls the daytime light relay coil. When energized, this relay
directs power

through daytime light relay terminal 3

to front combination lamp LH terminal 2

through front combination lamp LH terminal 6

to IPDM E/R terminal 55

through 10A fuse (No. 35, located in the IPDM E/R)

through 10A fuse (No. 34, located in the IPDM E/R)

through IPDM E/R terminal 56

to front combination lamp RH terminal 6.
Ground is supplied

to front combination lamp RH terminal 2

through grounds E9, E15 and E24.
With power and ground supplied, the daytime lights illuminate. The high beam headlamps are now wired in
series and illuminate at a reduced intensity.
COMBINATION SWITCH READING FUNCTION
Refer to BCS-3, "COMBINATION SWITCH READING FUNCTION" .

HEADLAMP (FOR CANADA) - DAYTIME LIGHT SYSTEM -LT-43
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2. CHECK POWER SUPPLY CIRCUIT
1. Disconnect BCM connectors.
2. Check voltage between BCM harness connector and ground.
OK or NG
OK >> GO TO 3.
NG >> Check harness for open or short between BCM and fuse or fusible link.
3. CHECK GROUND CIRCUIT
Check continuity between BCM harness connector and ground.
OK or NG
OK >> Inspection End.
NG >> Check ground circuit harness.
INSPECTION PARKING BRAKE SWITCH CIRCUIT
1. CHECK BRAKE INDICATOR
1. Turn ignition switch ON.
2. Apply parking brake.
3. Release parking brake.
OK or NG
OK >> Inspection End.
NG >> GO TO 2.
BCM Ignition switch position
(+) (– )OFFACCON
Connector Terminal
M18 38 Ground0V 0V
Battery
voltage
M20 70 Battery
voltage Battery
voltage Battery
voltage
WKIA1436E
BCM Continuity
Connector Terminal
M20 67Ground Yes
LIIA0915E
Brake indicator in combination meter should illuminate
when parking brake is applied and turn OFF when
released.

LT-44
HEADLAMP (FOR CANADA) - DAYTIME LIGHT SYSTEM -
Revision: November 20092006 QX56
2. CHECK PARKING BRAKE SWITCH SIGNAL
1. Turn ignition switch OFF.
2. Disconnect parking brake switch connector.
3. Turn ignition switch ON.
4. Check voltage between parking brake switch connector M11 ter- minal 1 and ground.
OK or NG
OK >> Replace parking brake switch.
NG >> GO TO 3.
3. CHECK PARKING BRAKE SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect combination meter connector.
3. Check continuity between combination meter connector M24 (A) terminal 23 and parking brake switch connector M11 (B) terminal
1.
OK or NG
OK >> Replace combination meter. Refer to IP-13, "COMBINA-
TION METER" .
NG >> Repair harness or connector.
CONSULT-II FunctionsEKS00B8L
Refer to LT- 1 6 , "CONSULT-II Function (BCM)" in HEADLAMP (FOR USA).
Refer to LT- 1 9 , "
CONSULT-II Function (IPDM E/R)" in HEADLAMP (FOR USA).
Daytime Light Control Does Not Operate Properly (Normal Headlamps Operate
Properly)
EKS00D6B
1. CHECK DAYTIME LIGHT RELAY POWER SUPPLY CIRCUIT
1. Remove daytime light relay.
2. Check voltage between daytime light relay connector E103 ter- minals 2, 5 and ground.
OK or NG
OK >> GO TO 2.
NG >> Repair harness or connector. 1 - Ground
: Battery voltage should exist.
WKIA4609E
1 - 23: Continuity should exist.
WKIA4610E
2, 5 - Ground : Battery voltage should exist.
WKIA4611E

HEADLAMP (FOR CANADA) - DAYTIME LIGHT SYSTEM -LT-45
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2. CHECK DAYTIME LIGHT RELAY
1. Apply battery voltage to daytime light relay terminal 2 and ground terminal 1.
2. Check continuity between terminals 3 and 5.
OK or NG
OK >> GO TO 3.
NG >> Replace daytime light relay.
3. CHECK DAYTIME LIGHT RELAY CIRCUIT
1. Disconnect IPDM E/R connector E122.
2. Check continuity between daytime light relay connector E103 (B) terminal 1 and front combination lamp LH connector E122
(A) terminal 44.
OK or NG
OK >> GO TO 4.
NG >> Repair harness or connector.
4. CHECK INPUT SIGNAL
1. Connect daytime light relay and IPDM E/R connector.
2. Start engine and release parking brake. Headlamp switch OFF.
3. Select "IPDM E/R" on CONSULT-II. With data monitor, make sure "DTRL REQ" turns ON-OFF linked with operation of park-
ing brake switch.
OK or NG
OK >> Replace IPDM E/R. Refer to PG-30, "Removal and
Installation of IPDM E/R" .
NG >> GO TO 5.
5. CHECKING CAN COMMUNICATIONS
Select "BCM" on CONSULT-II and perform self-diagnosis for BCM.
Displayed self-diagnosis results
NO DTC>> Replace BCM. Refer to BCS-20, "BCM" .
CAN COMM CIRCUIT>> Check BCM CAN communication system.
Refer to BCS-13, "
CAN Communication Inspection
Using CONSULT-II (Self-Diagnosis)" .
3 - 5 : Continuity should exist.
SKIB4671E
44 - 1
: Continuity should exist.
WKIA4612E
Parking brake ON : DTRL REQ ON
Parking brake OFF : DTRL REQ OFF
WKIA1449E
SKIA1039E

TURN SIGNAL AND HAZARD WARNING LAMPSLT-91
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4. Touch "FLASHER" on "SELECT TEST ITEM" screen.
DATA MONITOR
Operation Procedure
1. Touch "FLASHER" on "SELECT TEST ITEM" screen.
2. Touch "DATA MONITOR" on "SELECT DIAG MODE" screen.
3. Touch either "ALL SIGNALS" or "SELECTION FROM MENU" on the "SELECT MONITOR ITEM" screen.
4. Touch "START".
5. When "SELECTION FROM MENU" is selected, touch items to be monitored. When "ALL SIGNALS" is
selected, all the items will be monitored.
6. Touch "RECORD" while monitoring, then the status of the monitored item can be recorded. To stop recording, touch "STOP".
Display Item List
ACTIVE TEST
Operation Procedure
1. Touch "FLASHER" on "SELECT TEST ITEM" screen.
2. Touch "ACTIVE TEST" on "SELECT DIAG MODE" screen.
3. Touch item to be tested and check operation of the selected item.
4. During the operation check, touching "BACK" or "OFF" deactivates the operation.
Display Item List
LKIA0183E
ALL SIGNALS Monitors all the signals.
SELECTION FROM MENU Selects and monitors the individual signal.
Monitor item Contents
IGN ON SW "ON/OFF" Displays "IGN position (ON)/OFF, ACC position (OFF)" judged from the ignition switch signal.
HAZARD SW "ON/OFF" Displays "Hazard ON (ON)/Hazard OFF (OFF)" status, determined from hazard switch signal.
TURN SIGNAL R "ON/OFF" Displays "Turn right (ON)/Other (OFF)" status, determined from lighting switch signal.
TURN SIGNAL L "ON/OFF" Displays "Turn left (ON)/Other (OFF)" status, determined from lighting switch signal.
BRAKE SW "ON/OFF" Displays status of stop lamp switch.
Test item Description
FLASHER (RH) Turn signal lamp (right) can be operated by any ON-OFF operations.
FLASHER (LH) Turn signal lamp (left) can be operated by any ON-OFF operations.

LT-106
STOP LAMP
Revision: November 20092006 QX56
STOP LAMPPFP:26550
System DescriptionEKS00BAD
Power is supplied at all times

through 10A fuse [No. 20, located in fuse block (J/B)]

to stop lamp switch terminal 3, and

to stop lamp relay terminal 1.
When the brake pedal is pressed, the stop lamp switch is closed and power is supplied

through stop lamp switch terminal 4

to stop lamp relay terminal 3

through stop lamp relay terminal 4

to rear combination lamp LH and RH terminal 2, and

to high-mounted stop lamp terminal 1.
Ground is supplied

to rear combination lamp LH terminal 1, and

to high-mounted stop lamp terminal 2

through grounds B7 and B19, and

to rear combination lamp RH terminal 1

through grounds B117 and B132.
With power and ground supplied, the stop lamps illuminate.