2009 INFINITI QX56 power steering

SEC-2
B2192, P1611 ID DISCORD, IMMU-ECM .........31
Description ........................................................... ...31
DTC Logic ...............................................................31
Diagnosis Procedure ..............................................31
B2193, P1612 CHAIN OF ECM-IMMU ..............33
Description ........................................................... ...33
DTC Logic ...............................................................33
Diagnosis Procedure ..............................................33
B2194 ID DISCORD IMMU-I-KEY .....................34
Description ........................................................... ...34
DTC Logic ...............................................................34
Diagnosis Procedure ..............................................34
B2552 INTELLIGENT KEY ................................35
Description ........................................................... ...35
DTC Logic ...............................................................35
Diagnosis Procedure ..............................................35
Special Repair Requirement ...................................35
B2590 ID DISCORD BCM-I-KEY .................... ...36
Description ........................................................... ...36
DTC Logic ...............................................................36
Diagnosis Procedure ..............................................36
P1610 LOCK MODE ..........................................37
Description ........................................................... ...37
DTC Logic ...............................................................37
Diagnosis Procedure ..............................................37
POWER SUPPLY AND GROUND CIRCUIT .....38
INTELLIGENT KEY UNIT ...................................... ...38
INTELLIGENT KEY UNIT : Diagnosis Procedure ...38
BCM ........................................................................ ...38
BCM : Diagnosis Procedure ...................................38
KEY CYLINDER SWITCH .................................40
Description ........................................................... ...40
Component Function Check ...................................40
Diagnosis Procedure ..............................................40
IGNITION KNOB SWITCH .................................42
Ignition Knob Switch Check ................................. ...42
HOOD SWITCH .................................................44
Diagnosis Procedure ..............................................44
HORN FUNCTION .............................................46
Symptom Table ................................................... ...46
VEHICLE SECURITY INDICATOR ....................47
Description ........................................................... ...47
Component Function Check .................................47
Diagnosis Procedure ..............................................47
ECU DIAGNOSIS ..................................... ...49
BCM (BODY CONTROL MODULE) ............... ...49
Reference Value .................................................. ...49
Terminal Layout ......................................................51
Physical Values .......................................................51
Wiring Diagram - VEHICLE SECURITY SYSTEM ...57
Wiring Diagram - IVIS .............................................68
Fail Safe .................................................................76
DTC Inspection Priority Chart ...............................77
DTC Index ..............................................................77
INTELLIGENT KEY UNIT ..................................79
Reference Value - Intelligent Key Unit ................. ...79
Reference Value - Steering Lock Solenoid .............82
Wiring Diagram - INTELLIGENT KEY SYSTEM/
ENGINE START FUNCTION - ................................
83
Fail Safe .................................................................95
DTC Inspection Priority Chart ...............................95
DTC Index ..............................................................95
IPDM E/R (INTELLIGENT POWER DISTRI-
BUTION MODULE ENGINE ROOM) .................
96
Reference Value .................................................. ...96
Terminal Layout ......................................................98
Physical Values .......................................................98
Fail Safe ...............................................................102
DTC Index ............................................................103
SYMPTOM DIAGNOSIS ...........................104
INTELLIGENT KEY SYSTEM/ENGINE
START FUNCTION SYMPTOMS ................... ..
104
Symptom Table .................................................... .104
VEHICLE SECURITY SYSTEM SYMPTOMS ..105
Symptom Table .....................................................105
INFINITI VEHICLE IMMOBILIZER SYSTEM-
NATS SYMPTOMS ...........................................
106
Symptom Table .................................................... .106
ON-VEHICLE MAINTENANCE .................107
PRE-INSPECTION FOR DIAGNOSTIC ......... ..107
Basic Inspection ................................................... .107
Vehicle Security Operation Check ........................107
PRECAUTION ...........................................109
PRECAUTIONS .............................................. ..109
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .............................................................. .
109
Precaution Necessary for Steering Wheel Rota-
tion After Battery Disconnect ................................
109
ON-VEHICLE REPAIR ..............................111
VEHICLE SECURITY SYSTEM ...................... ..111
Removal and Installation .......................................111
Revision: December 20092009 QX56

SEC-8
< FUNCTION DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION
• Intelligent Key has 2 IDs (for Intelligent Key and for
NATS). It can perform the door lock/unlock operation and
the engine start operation when the registered Intelligent Key is carried.
• When the Intelligent Key battery is discharged, it can be used as emergency back-up by inserting the
mechanical key set in the Intelligent Key to the ignition key cylinder. At that time, perform the NATS ID verifi-
cation. If it is used when the Intelligent Key is carried, perform the Intelligent Key ID verification.
• If the ID is successfully verified, and when the igniti on knob switch is pressed, steering lock will be released
and initiating the engine will be possible.
• The door lock/unlock operation can be performed when the Intelligent Key battery is discharged, by operat-
ing the driver door key cylinder using the mechanical key set in the Intelligent Key.
• Up to 4 Intelligent Keys can be registered (including the standard Intelligent Key) on request from the owner. NOTE:
• Refer to DLK-21, "
INTELLIGENT KEY : System Description" for any functions other than engine start func-
tion of Intelligent Key system.
PRECAUTIONS FOR INTELLIGENT KEY SYSTEM
• For vehicles equipped with the Intelligent Key system , the transponder [the chip for NATS ID verifi-
cation] is integrated into the Inte lligent Key. Therefore, the Intellig ent Key alone is capable of provid-
ing security clearance for the engine to start. Also, when the mechanical key alone is inserted into
the key cylinder, performs the NATS ID verification to allow the engine to start. For vehicles without
Intelligent Key system, the transponder is integrated into the mechanical key which must be inserted
into the key cylinder to perform the NATS ID verification to allow the engine to start.
OPERATION WHEN INTELLIGENT KEY IS CARRIED
1. When the ignition knob switch is ON, the Intelligent Key unit transmits the request signal to the Intelligent
Key.
2. The Intelligent Key receives the request signal and transmits the Intelligent Key ID signal to the Intelligent Key unit.
3. The Intelligent Key unit receives the Intelligent Key ID signal and verifies it with the registered ID.
4. Intelligent Key unit transmits the steering lock/unlock signal to steering lock solenoid if the verification results are OK. For detail of key warning message operation, refer to DLK-38, "
System Description".
5. Release of the steering lock.
6. BCM transmits the starter request signal via CAN communication to IPDM E/R and turns the starter relay in IPDM E/R ON if BCM judges that the engine start condition is satisfied.
7. IPDM E/R turns the starter control relay ON when receiving the starter request signal.
8. When shift position is in P or N position, battery power is supplied through the starter relay and operate the starter motor and to start the cranking.
CAUTION:
If a malfunction is detected in the Intelligent Key system, the “KEY” warning message will be dis-
played in the combination meter. At th at time, the engine cannot be started.
OPERATION RANGE
Engine can be started when Intelligent Key is inside the vehicle. However, sometimes engine might not start
when Intelligent Key is on instrument panel or in glove box.
OPERATION WHEN MECHANICAL KEY IS USED
When the Intelligent Key battery is discharged, performs the NATS ID verification between the integrated tran-
sponder and BCM by inserting the mechanical key into the key cylinder, and then the engine can be started.
For details relating to starting the engine using mechanical key, refer to SEC-11, "
System Description".
STEERING LOCK OPERATION
Steering is locked by steering lock solenoid when ignition switch is in the LOCK position (the ignition knob is
released) and key switch is OFF (key is removed from ignition key cylinder).
Revision: December 20092009 QX56

SEC-24
< COMPONENT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
B2013 ID DISCORD I-KEY-STRG
B2013 ID DISCORD I-KEY-STRG
DescriptionINFOID:0000000003775891
Intelligent Key unit performs the ID verification with the
steering lock solenoid and releases the steering lock if
both Intelligent Key unit and steering lock solenoid ID are same. Intelligent Key unit starts the communication
with the steering lock solenoid when Intelligent Key is carried into the vehicle and the ignition knob switch is
pressed.
DTC LogicINFOID:0000000003775892
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Press the ignition knob switch.
2. Check “Self diagnostic result” with CONSULT-III.
Is DTC detected?
YES >> Refer to SEC-24, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000003775893
1.PERFORM INITIALIZATION
Perform initialization with CONSULT-III. Re-register all mechanical keys.
For initialization and registration of mechanical key. Refer to “CONSULT-III Operation Manual”.
Can the system be initialized and can steering lo ck be released with re-registered mechanical key?
YES >> Steering lock solenoid was unregistered.
NO >> GO TO 2
2.CHECK STEERING LOCK SOLENOID POWER SUPPLY-1
1. Turn ignition switch OFF.
2. Disconnect steering lock solenoid connector.
3. Check voltage between steering lock solenoid harness connec- tor and ground.
Is the inspection result normal?
YES >> GO TO 3
NO >> Repair or replace harness.
3.CHECK STEERING LOCK SOLENOID GROUND CIRCUIT
DTC No.Trouble diagnosis
name DTC detecting condition
Possible cause
B2013 STRG COMM 1 The ID verification results between Intelligent Key
unit and steering control unit are NG. The registra-
tion is necessary.
Steering lock solenoid
Te r m i n a l s
Voltage (V)(Approx.)
(+)
(–)
Steering lock solenoid con-
nector Te r m i n a l
M15 1Ground Battery voltage
WIIA1202E
Revision: December 20092009 QX56

B2013 ID DISCORD I-KEY-STRGSEC-25
< COMPONENT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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SEC
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Check continuity between steering lock solenoid harness connector
and ground.
Is the inspection result normal?
YES >> GO TO 4
NO >> Repair or replace harness.
4.CHECK STEERING LOCK SOLE NOID COMMUNICATION CIRCUITS
1. Disconnect Intelligent Key unit connector.
2. Check continuity between steer ing lock solenoid connector (A)
M15 terminals 2, 3 and Intelligent Key unit connector (B) M70
terminals 1, 32.
3. Check continuity between steer ing lock solenoid connector (A)
M15 terminals 2, 3 and ground.
Is the inspection result normal?
YES >> GO TO 5
NO >> Repair or replace harness.
5.CHECK INTELLIGENT KEY UNIT POWER SUPPLY-2
1. Connect Intelligent Key unit connector.
2. Check voltage between Intelligent Key unit harness connector and ground.
Is the inspection result normal?
YES >> GO TO 6
NO >> Replace Intelligent Key unit. Refer to S E C - 111 ,
"Removal and Installation".
6.CHECK STEERING LOCK SOLE NOID COMMUNICATION CIRCUIT
1. Connect steering lock solenoid connector.
Te r m i n a l s
Continuity
(+)
(–)
Steering lock solenoid con-
nector Te r m i n a l
M15 4Ground Yes
WIIA1203E
Te r m i n a l s
Continuity
Steering lock sole-
noid connector Te r m i n a l
Intelligent Key unit
connector Te r m i n a l
M15 2
M70 1
Ye s
33 2
Te r m i n a l s Continuity
Steering lock solenoid connector Terminals
M15 2
Ground No
3
WIIA1206E
Te r m i n a l s
Voltage (V)
(Approx.)
(+)
(–)
Intelligent Key unit connector Terminal
M70 1Ground 5
WIIA1204E
Revision: December 20092009 QX56

B2190, P1614 NATS ANTENNA AMP.SEC-27
< COMPONENT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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B2190, P1614 NATS ANTENNA AMP.
DescriptionINFOID:0000000003775894
Performs ID verification through BCM and NATS antenna amplifier when ignition knob switch is pressed.
Prohibits the release of steering lock or start of engine when an unregistered ID of mechanical key is used.
DTC LogicINFOID:0000000003775895
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Insert mechanical key into the key cylinder.
2. Press the ignition knob switch.
3. Check “Self diagnostic result” with CONSULT-III.
Is DTC detected?
YES >> Refer to SEC-27, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000003775896
1.CHECK NATS ANTENNA AMP. INSTALLATION
Check NATS antenna amp. installation. Refer to S E C - 111 , "
Removal and Installation".
Is the inspection result normal?
YES >> GO TO 2
NO >> Reinstall NATS antenna amp. correctly.
2.CHECK NVIS (NATS) IGNITION KEY ID CHIP
Start engine with another registered NATS ignition key.
Does the engine start?
YES >> • Ignition key ID chip is malfunctioning. • Replace the ignition key.
• Perform initialization with CONSULT-III.For initialization, refer to “CONSULT-III Operation Manual”.
NO >> GO TO 3
3.CHECK POWER SUPPLY FOR NATS ANTENNA AMP.
1. Turn ignition switch ON.
2. Check voltage between NATS antenna amp. connector M21 terminal 1 and ground.
DTC No. Trouble diagnosis
name DTC detecting condition
Possible cause
B2190
NATS ANTENNA
AMP • Inactive communication between NATS antenna
amp. and BCM.
• Mechanical key is malfunctioning. • Harness or connectors
(The NATS antenna amp. circuit is
open or shorted)
• Mechanical key
• NATS antenna amp.
•BCM
P1614
Revision: December 20092009 QX56

INTELLIGENT KEY UNITSEC-79
< ECU DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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INTELLIGENT KEY UNIT
Reference Value - Intelligent Key UnitINFOID:0000000004221485
TERMINAL LAYOUT
PHYSICAL VALUES
WIIA1168E
Te r m i n a lWire
Color Item Condition
Voltage (V)Approx.
Ignition
Switch Po- sition Operation or Conditions
1L/Y Steering lock sole-
noid power supply LOCK
— 5
2 L CAN-H —— —
3 P CAN-L —— —
4GR Intelligent Key warn-
ing buzzer (front of
vehicle) LOCK
Operate door request
switch. Buzzer OFF
Battery voltage
Buzzer ON 0
5B/W Front door request
switch LH —Press front door request switch LH.
0
Other than above Battery voltage
6 G/R Ignition switch (ON) ON —Battery voltage
7 B/R Key switch LOCKInsert mechanical key into ignition key
cylinder.
Battery voltage
Remove mechanical key from ignition
key cylinder. 0
8G Remote keyless en-
try receiver ground
—— 0
9GR Remote keyless en-
try receiver signal —When remote keyless entry receiver re-
ceives signal from keyfob.
Stand-by
11 Y Power source (Fuse) — —Battery voltage
12 B Ground —— 0
OCC3879D
Revision: December 20092009 QX56

INTELLIGENT KEY UNITSEC-81
< ECU DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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30 G/B Remote keyless en-
try receiver power
supply
—— 5
32 L/O Steering lock sole-
noid communication
signal LOCKWhen Intelligent Key is inside vehicle,
press ignition knob switch.
Other than above
5
33 W Inside key antenna 4
(overhead console
area) (+) signal
LOCKPress ignition knob switch: ON (Ignition
knob switch)
34 BR Inside key antenna 4
(overhead console
area) (-) signal
35 O Inside key antenna 2
(luggage compart-
ment) (+) signal
LOCK Back door open → all doors closed
36 R Inside key antenna 2
(luggage compart-
ment) (-) signal
37 LG Front outside anten-
na (+) signal RH
LOCK Press front door request switch RH.
38 B/Y Front outside anten-
na (-) signal RH
39 L/R P range switch —Selector lever is in “P” position.
0
Other than above Battery voltage
40 V AS select unlock out-
put
—UNLOCK with rear door locks disabled.
0
Other than above Battery voltage
Te r m i n a l
Wire
Color Item Condition
Voltage (V)Approx.
Ignition
Switch Po-
sition Operation or Conditions
SIIA1911J
PIIB7441E
PIIB7441E
SIIA1910J
Revision: December 20092009 QX56

SEC-82
< ECU DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
INTELLIGENT KEY UNIT
Reference Value - Steering Lock Solenoid
INFOID:0000000004221486
TERMINAL LAYOUT
PHYSICAL VALUES
WIIA1169E
Te r m i n a l Wire
Color Signal Designation Condition
Voltage (V)Approx.
Ignition
Switch Posi- tion Operation or Conditions
1 G/Y Power source (fuse) LOCK —Battery voltage
2L/Y Steering lock solenoid
power supply LOCK
— 5
3L/O Steering lock solenoid
communication signal
LOCKWhen Intelligent Key is inside ve-
hicle, press ignition knob switch.
Other than the above
5
4B Steering lock solenoid
ground —— 0
SIIA1911J
Revision: December 20092009 QX56