diagram INFINITI QX56 2009 Factory Service Manual

IGNITION SIGNALEC-405
< COMPONENT DIAGNOSIS > [VK56DE]
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EC
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OK >>
INSPECTION END
NG >> GO TO 10.
4.CHECK IGNITION COIL POWER SUPPLY CIRCUIT-I
1. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
2. Check voltage between ECM terminals 119, 120 and ground with CONSULT-IIl or tester.
OK or NG
OK >> GO TO 5.
NG >> Go to EC-82
.
5.CHECK IGNITION COIL POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF.
2. Disconnect condenser-1 harness connector.
3. Turn ignition switch ON.
4. Check voltage between condenser-1 terminal 1 and ground with CONSULT-IIl or tester.
OK or NG
OK >> GO TO 8.
NG >> GO TO 6.
6.CHECK IGNITION COIL POWER SUPPLY CIRCUIT-III
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R connector E119.
3. Check harness continuity between IPDM E/R terminal 4 and condenser-1 terminal 1. Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> Go to EC-82.
NG >> GO TO 7.
7.DETECT MALFUNCTIONING PART
Check the following.
 Harness connectors E2, F32 Voltage: Battery voltage
MBIB0034E
BBIA0358E
Voltage: Battery voltage
PBIB0624E
Continuity should exist.
Revision: December 20092009 QX56

EC-406
< COMPONENT DIAGNOSIS >[VK56DE]
IGNITION SIGNAL
 Harness for open or short between condenser-1 and IPDM E/R
>> Repair open circuit or short to ground or short to power in harness or connectors.
8.CHECK CONDENSER-1 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Check harness continuity between condenser-1 terminal 2 and ground. Refer to Wiring Diagram.
3. Also check harness for short to power.
OK or NG
OK >> GO TO 9.
NG >> Repair open circuit or short to power in harness or connectors.
9.CHECK CONDENSER-1
Refer to EC-407, "Component Inspection"
.
OK or NG
OK >> GO TO 10.
NG >> Replace condenser-1.
10.CHECK IGNITION COIL POWER SUPPLY CIRCUIT-IV
1. Turn ignition switch OFF.
2. Reconnect all harness connectors disconnected.
3. Disconnect ignition coil harness connector.
4. Turn ignition switch ON.
5. Check voltage between ignition coil terminal 3 and ground with CONSULT-IIl or tester.
OK or NG
OK >> GO TO 12.
NG >> GO TO 11.
11 .DETECT MALFUNCTIONING PART
Check the following.
 Harness connectors E2, F32
 Harness for open or short between ignition coil and harness connector F32 Continuity should exist.
1. Ignition coils (with power transistor)
(bank 2) 2. Ignition coils (with power transistor)
(bank 1)
Voltage: Battery voltage
BBIA0777E
PBIB0138E
Revision: December 20092009 QX56

IGNITION SIGNALEC-407
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>> Repair or replace harness or connectors.
12.CHECK IGNITION COIL GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Check harness continuity between ignition coil terminal 2 and ground. Refer to Wiring Diagram.
3. Also check harness for short to power.
OK or NG
OK >> GO TO 13.
NG >> Repair open circuit or short to power in harness or connectors.
13.CHECK IGNITION COIL OUTPUT SI GNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminals 46, 60, 61, 62, 65, 79, 80, 81 and ignition coil terminal
1.
Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 14.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
14.CHECK IGNITION COIL WITH POWER TRANSISTOR
Refer to EC-407, "Component Inspection"
.
OK or NG
OK >> GO TO 15.
NG >> Replace ignition coil with power transistor.
15.CHECK INTERMITTENT INCIDENT
Refer to GI-35, "How to Check Terminal"
and GI-38, "Intermittent Incident".
>> INSPECTION END
Component InspectionINFOID:0000000003771723
IGNITION COIL WITH POWER TRANSISTOR
CAUTION:
Do the following procedure in the place where ventilation is good without the combustible.
1. Turn ignition switch OFF.
2. Disconnect ignition coil harness connector.
3. Check resistance between ignition coil terminals as follows.
4. If NG, replace ignition coil with power transistor.
If OK, go to next step.
5. Turn ignition switch OFF.
6. Reconnect all harness connectors disconnected. Continuity should exist.
Continuity should exist.
Terminal No. (Polarity) Resistance
Ω [at 25 °C (77 °F)]
1 and 2 Except 0 or ∞
1 and 3 Except 0
2 and 3
PBIB0847E
Revision: December 20092009 QX56

REFRIGERANT PRESSURE SENSOREC-417
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Refer to
EC-85, "Ground Inspection".
OK or NG
OK >> GO TO 3.
NG >> Repair or replace ground connections.
3.CHECK REFRIGERANT PRESSURE SE NSOR POWER SUPPLY CIRCUIT
1. Disconnect refrigerant pressu re sensor harness connector.
2. Turn ignition switch ON.
3. Check voltage between refrigerant pressure sensor terminal 1 and ground with CONSULT-IIl or tester.
OK or NG
OK >> GO TO 5.
NG >> GO TO 4.
4.DETECT MALFUNCTIONING PART
Check the following.
 Harness connectors E5, F14
 Harness for open or short between ECM and refrigerant pressure sensor
>> Repair harness or connectors.
5.CHECK REFRIGERANT PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between refrigerant pressure sensor terminal 3 and ECM terminal 67. Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 7.
NG >> GO TO 6.
BBIA0354E
BBIA0445E
Voltage: Approximately 5V
PBIB0188E
Continuity should exist.
Revision: December 20092009 QX56

EC-418
< COMPONENT DIAGNOSIS >[VK56DE]
REFRIGERANT PRESSURE SENSOR
6.DETECT MALFUNCTIONING PART
Check the following.
 Harness connectors E5, F14
 Harness for open or short between ECM and refrigerant pressure sensor
>> Repair open circuit or short to ground or short to power in harness or connectors.
7.CHECK REFRIGERANT PRESSURE SENSOR INPU T SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 70 and refrigerant pressure sensor terminal 2. Refer to Wiring Diagram.
2. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 9.
NG >> GO TO 8.
8.DETECT MALFUNCTIONING PART
Check the following.
 Harness connectors E5, F14
 Harness for open or short between ECM and refrigerant pressure sensor
>> Repair open circuit or short to ground or short to power in harness or connectors.
9.CHECK INTERMITTENT INCIDENT
Refer to GI-35, "How to Check Terminal"
and GI-38, "Intermittent Incident".
OK or NG
OK >> Replace refrigerant pressure sensor.
NG >> Repair or replace. Continuity should exist.
Revision: December 20092009 QX56

EC-432
< ECU DIAGNOSIS >[VK56DE]
ECM
Wiring Diagram - ENGINE CONTROL SYSTEM -
INFOID:0000000003771734
AABWA0099GB
Revision: December 20092009 QX56

EXL-1
DRIVER CONTROLS
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SECTION EXL
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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

HEADLAMPEXL-7
< FUNCTION DIAGNOSIS >
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FUNCTION DIAGNOSIS
HEADLAMP
System DiagramINFOID:0000000005867511
System DescriptionINFOID:0000000005867512
Control of the headlamp system operation is dependent upon t he position of the combination switch (lighting
and turn signal switch). When the combination switch (lighting and turn signal switch) is placed in the 2nd posi-
tion, the BCM (body control module) receives input requesting the headlamps and park lamps to illuminate.
This input is communicated to the IPDM E/R (intelligent power distribution module engine room) via the CAN
communication lines. The CPU (central processing unit) of the IPDM E/R controls the headlamp LH high,
headlamp RH high and headlamp low relay coils. When energiz ed, these relays direct power to the respective
headlamps, which then illuminate.
Component Parts LocationINFOID:0000000005867513
Component DescriptionINFOID:0000000005867514
XENON HEADLAMP
AWLIA1755GB
1. BCM M18, M20 (view with instrument
panel removed) 2. IPDM E/R E122, E123, E124 3. Combination switch (lighting and turn
signal switch) M28
4. Combination meter M23, M24
AWLIA1625ZZ
Revision: December 20092009 QX56

DAYTIME LIGHT SYSTEMEXL-9
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DAYTIME LIGHT SYSTEM
System DiagramINFOID:0000000003776148
System DescriptionINFOID:0000000003776149
The headlamp system for Canada vehicles is equipped with a daytime light control unit that activates the high
beam headlamps at approximately half illumination whenever the engine is operating. If the parking brake is
applied before the engine is started the daytime lights will not be illuminated. The daytime lights will illuminate
once the parking brake is released. Thereafter, the daytime lights will continue to operate when the parking
brake is applied.
Component Parts LocationINFOID:0000000003776150
AWLIA1596GB
AWLIA1626ZZ
Revision: December 20092009 QX56