2009 INFINITI QX56 turn signal

BCM (BODY CONTROL MODULE)SEC-77
< ECU DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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DTC Inspection Priority ChartINFOID:0000000004221477
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
DTC IndexINFOID:0000000004221478
NOTE: Details of time display
• CRNT: Displays when there is a malfunction now or after returning to the normal condition until turning igni-
tion switch OFF → ON again.
• 1 - 39: Displayed if any previous ma lfunction is present when current conditi on is normal. It increases like 1
→ 2 → 3...38 → 39 after returning to the normal condition whenever ignition switch OFF → ON. The counter
remains at 39 even if the number of cycles exceeds it. It is counted from 1 again when turning ignition switch
OFF → ON after returning to the normal condi tion if the malfunction is detected again.
Display contents of CONSULT Fail-safe Cancellation
U1000: CAN COMM CIRCUIT I nhibit engine crankingWhen the BCM re-establishes communication with the other mod-
ules.
U1010: CONTROL UNIT (CAN) Inhibit engine cranking When the BCM re-start communicating with the other modules.
Priority DTC
1 • U1000: CAN COMM CIRCUIT
• U1010: CONTROL UNIT (CAN)
2 • B2190: NATS ANTENNA AMP
• B2191: DIFFERENCE OF KEY
• B2192: ID DISCORD BCM-ECM
• B2193: CHAIN OF BCM-ECM
• B2013: STRG COMM 1
• B2552: INTELLIGENT KEY
• B2590: NATS MALFUNCTION
3 • C1729: VHCL SPEED SIG ERR
• C1735: IGNITION SIGNAL
4 • C1704: LOW PRESSURE FL
• C1705: LOW PRESSURE FR
• C1706: LOW PRESSURE RR
• C1707: LOW PRESSURE RL
• C1708: [NO DATA] FL
• C1709: [NO DATA] FR
• C1710: [NO DATA] RR
• C1711: [NO DATA] RL
• C1712: [CHECKSUM ERR] FL
• C1713: [CHECKSUM ERR] FR
• C1714: [CHECKSUM ERR] RR
• C1715: [CHECKSUM ERR] RL
• C1716: [PRESSDATA ERR] FL
• C1717: [PRESSDATA ERR] FR
• C1718: [PRESSDATA ERR] RR
• C1719: [PRESSDATA ERR] RL
• C1720: [CODE ERR] FL
• C1721: [CODE ERR] FR
• C1722: [CODE ERR] RR
• C1723: [CODE ERR] RL
• C1724: [BATT VOLT LOW] FL
• C1725: [BATT VOLT LOW] FR
• C1726: [BATT VOLT LOW] RR
• C1727: [BATT VOLT LOW] RL
Revision: December 20092009 QX56

SEC-80
< ECU DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
INTELLIGENT KEY UNIT
13 B/WInside key antenna 3
(front of center con-
sole) (+) signal
LOCK Any door open → all doors closed
14 W/G Inside key antenna 3
(front of center con-
sole) (-) signal
15 G Inside key antenna 1
(rear of center con-
sole) (+) signal
LOCK Any door open → all doors closed
16 L Inside key antenna 1
(rear of center con-
sole) (-) signal
17 W/L Rear bumper anten-
na (+) signal
LOCK Lift back door handle (close switch).
18 W/R Rear bumper anten-
na (-) signal
19 P Front outside anten-
na LH (+) signal
LOCK Press front door request switch LH.
20 V Front outside anten-
na LH (-) signal
21 B/W Remote keyless en-
try receiver RSSI sig-
nal ——
23 L/W Power back door out-
put —Power liftgate switch ON.
0
Power liftgate switch OFF. Battery voltage
25 P/L Front door request
switch RH —Press front door request switch RH.
0
Other than above Battery voltage
27 R/B Ignition knob switch — Press ignition switch.
Battery voltage
Return ignition switch to LOCK position. 0
28 R Unlock sensor
(driver side) —Door (driver si
de) is locked. 5
Door (driver side ) is unlocked. 0
29 LG/W Back door open
switch input —Back door handle switch ON.
0
Back door handle switch OFF. Battery voltage
Te r m i n a l
Wire
Color Item Condition
Voltage (V)Approx.
Ignition
Switch Po-
sition Operation or Conditions
PIIB7441E
PIIB7441E
SIIA1910J
SIIA1910J
PIIA2344E
Revision: December 20092009 QX56

INTELLIGENT KEY UNITSEC-95
< ECU DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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Fail SafeINFOID:0000000003775938
DTC Inspection Priority ChartINFOID:0000000003775939
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
DTC IndexINFOID:0000000003775940
NOTE: Details of time display
• CRNT: Displays when there is a malfunction now or after returning to the normal condition until turning igni- tion switch OFF → ON again.
• 1 - 39: Displayed if any previous ma lfunction is present when current conditi on is normal. It increases like 1
→ 2 → 3...38 → 39 after returning to the normal condition whenever ignition switch OFF → ON. The counter
remains at 39 even if the number of cycles exceeds it. It is counted from 1 again when turning ignition switch
OFF → ON after returning to the normal condi tion if the malfunction is detected again.
Display contents of CONSULT-III Fail-safeCancellation
B2013: STRG COMM 1 • Inhibits steering look unlocking Erase DTC
B2552: INTELLIGENT KEY • Inhibits steering look unlocking
• Inhibits engine cranking
(BCM)
•Fuel cut (ECM) Erase DTC
B2590: NATS MALFUNCTION • Inhibits steering look unlocking
• Inhibits engine cranking
(BCM)
•Fuel cut (ECM) Erase DTC
Priority
DTC
1 • U1000: CAN COMM CIRCUIT
• U1010: CONTROL UNIT (CAN)
• B2552: INTELIGENT KEY
2 • B2013: STRG COMM 1
• B2590: NATS MALFUNCTION
CONSULT display
Detection conditionFail-safe Diagnosis
No DTC is detected.
further testing
may be required. ——
—
U1000: CAN COMM CIRCUIT Intelligent Key unit cannot receive CAN communi-
cation signal continuously for 2 seconds or more.
—Check CAN communi-
cation system.
Refer to SEC-22
U1010: CONTROL UNIT (CAN)
Intelligent Key unit detects internal CAN communi-
cation circuit malfunction.
—Replace Intelligent Key
unit.
B2013: STRG COMM 1 The ID verification result between Intelligent key
unit and steering lock solenoid are NG. Or Intelligent
Key unit cannot communicate with steering lock so-
lenoid. ×
Perform steering lock
solenoid ID registration
with CONSULT-III
B2552: INTELLIGENT KEY Intelligent Key unit internal malfunction. ×Replace Intelligent Key
unit.
B2590: NATS MALFUNCTION The ID verification result between Intelligent key
unit and BCM are NG. Or Intelligent Key unit cannot
communicate with BCM. ×
Check NATS
Refer to SEC-36
Revision: December 20092009 QX56

SEC-102
< ECU DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
IPDM E/R (INTELLIGENT POWER DI
STRIBUTION MODULE ENGINE ROOM)
*: When horn reminder is ON
Fail SafeINFOID:0000000004221483
CAN COMMUNICATION CONTROL
When CAN communication with ECM and BCM is impossible, IPDM E/R performs fail-safe control. After CAN
communication recovers normally, it also returns to normal control.
If No CAN Communication Is Available With ECM
If No CAN Communication Is Available With BCM
IGNITION RELAY MALFUNCTION DETECTION FUNCTION
• IPDM E/R monitors the voltage at the contact circuit and excitation coil circuit of the ignition relay inside it.
• IPDM E/R judges the ignition relay error if the voltage differs between the contact circuit and the excitation
coil circuit.
• If the ignition relay cannot turn OFF due to contact seizure, it activates the tail lamp relay for 10 minutes to alert the user to the ignition relay malfunction when the ignition switch is turned OFF.
NOTE:
The tail lamp turns OFF when the ignition switch is turned ON.
FRONT WIPER CONTROL
IPDM E/R detects front wiper stop posit ion by a front wiper auto stop signal.
59 B Ground Input ——0V
60 B/W Rear window defog-
ger relay
OutputON or
START Rear defogger switch ON
Battery voltage
Rear defogger switch OFF 0V
61 BR Fuse 32 Output OFF—Battery voltage
Te r m i n a l
Wire
color Signal name Signal
input/
output Measuring condition
Reference value(Approx.)
Igni-
tion
switch Operation or condition
Control part
Fail-safe in operation
Cooling fan • Turns ON the cooling fan relay when the ignition switch is turned ON
• Turns OFF the cooling fan relay when the ignition switch is turned OFF
Control part
Fail-safe in operation
Headlamp • Turns ON the headlamp low relay when the ignition switch is turned ON
• Turns OFF the headlamp low relay when the ignition switch is turned OFF
• Headlamp high relay OFF
•Parking lamps
• License plate lamps
• Tail lamps • Turns ON the tail lamp relay when the ignition switch is turned ON
• Turns OFF the tail lamp relay when the ignition switch is turned OFF
Front wiper • The status just before activation of fail-safe control is maintained until the ignition
switch is turned OFF while the front wiper is operating at LO or HI speed.
• The wiper is operated at LO speed until the ignition switch is turned OFF if the fail- safe control is activated while the front wipe r is set in the INT mode and the front wiper
motor is operating.
Rear window defogger Rear window defogger relay OFF
A/C compressor A/C relay OFF
Front fog lamps Front fog lamp relay OFF
Ignition switch Ignition relayTail lamp relay
ON ON —
OFF OFF —
Revision: December 20092009 QX56

IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
SEC-103
< ECU DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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When a front wiper auto stop signal is in the conditions listed below, IPDM E/R stops power supply to wiper
after repeating a front wiper 10 second activation and 20 second stop five times.
NOTE:
This operation status can be confirmed on the IPDM E/R “DATA MONITOR” that displays “Block” for the item
“WIP PROT” while the wiper is stopped.
STARTER MOTOR PROTECTION FUNCTION
IPDM E/R turns OFF the starter control relay to protect the starter motor when the starter control relay remains
active for 90 seconds.
DTC IndexINFOID:0000000004221484
NOTE:
The details of TIME display are as follows.
• CRNT: The malfunctions that are detected now
• 1 - 39: The number is indicated when it is normal at present and a malfunction was detected in the past. It
increases like 0 → 1 → 2 ··· 38 → 39 after returning to the normal condition whenever IGN OFF → ON. It is
fixed to 39 until the self-diagnosis results are erased if it is over 39. It returns to 0 when a malfunction is
detected again in the process.
Ignition switch Front wiper switch Auto stop signal
ON OFF
Front wiper stop position signal cannot be
input 10 seconds.
ON The signal does not change for 10 seconds.
CONSULT-III display Fail-safe
TIMENOTERefer to
No DTC is detected.
further testing
may be required. ————
U1000: CAN COMM CIRCUIT ×CRNT 1 – 39 PCS-17
Revision: December 20092009 QX56

SEC-104
< SYMPTOM DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
INTELLIGENT KEY SYSTEM/ENGIN
E START FUNCTION SYMPTOMS
SYMPTOM DIAGNOSIS
INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION SYMPTOMS
Symptom TableINFOID:0000000003775944
NOTE:
• Before performing the diagnosis in the following table, check “ SEC-3, "
Work Flow"”.
• Check that vehicle is under the condition shown in “Conditions of vehicle” before starting diagnosis, and check each symptom.
• Engine cranking is enabled when the shift lever is in the "Park" position, and in the "Neutral" position only if
the brake pedal is depressed.
• If the following symptoms are detected, check syst ems shown in the “Diagnosis/service procedure” column
in this order.
CONDITIONS OF VEHICLE (OPERATING CONDITIONS)
• Engine start function is ON when setting on CONSULT-III.
• Mechanical key is not inserted in key cylinder.
• One or more of Intelligent Keys with registered Intelligent Key ID is in the vehicle.
Symptom Diagnosis/service procedureReference
page
Ignition switch does not turn on with Intelligent Key.
[LCD displays "KEY DETECTED"] 1. Check steering lock solenoid.
DLK-99
2. Replace Intelligent Key unit.SEC-111
Ignition switch does not turn on with Intelligent Key.
[LCD does not display "PUSH" with arrow toward key
cylinder] 1. Check Intelligent Key unit power supply and ground circuit.
DLK-682. Check ignition knob switch.DLK-116
3. Check key switch (BCM input).DLK-115
4. Check key switch (Intelligent Key unit input).DLK-113
5. Replace Intelligent Key unit.SEC-111
Ignition switch does not turn on with Intelligent Key.
[LCD displays " NO KEY"]1a. Check inside key antenna 1 (rear of center console).
DLK-60
1b. Check inside key antenna 2 (luggage compartment).DLK-62
1c. Check inside key antenna 3 (front of center console).DLK-64
1d. Check inside key antenna 4 (overhead console area).DLK-68
2. Replace Intelligent Key unit.SEC-111
Ignition switch does not turn on with mechanical key1. Check key switch (BCM input).
DLK-1152. Check key switch (Intelligent Key unit input).DLK-113
Engine cannot be cranked with transmission in "Park"
or in "Neutral" position with brake pedal depressed.1. Check transmission signal.
TM-44
2. Check stop lamp switch.EXL-91
Revision: December 20092009 QX56

SN-6
< FUNCTION DIAGNOSIS >
REAR SONAR SYSTEM
FUNCTION DIAGNOSIS
REAR SONAR SYSTEM
System DiagramINFOID:0000000004173795
System DescriptionINFOID:0000000004173796
FUNCTION
With power and ground supplied, transmission gear selector lever in R position, and the rear sonar system
OFF switch ON, the rear sonar system will detect obstacles within 1.8 m (5.9 ft.) of the rear sonar sensors. The
vehicle operator is notified of obstacles by varied rate of tone from the sonar buzzer depending on distance of
obstacle being sensed.
REAR SONAR SYSTEM OFF SWITCH
With power and ground supplied to the sonar control unit, transmission gear selector lever in R position, the
sonar system can be disabled and the sonar buzzer silenced by momentarily pressing the rear sonar system
OFF switch. The sonar system OFF indicator lamp will be illuminated in the rear sonar system OFF switch.
The rear sonar system and buzzer will be disabled and t he sonar system OFF indicator will be illuminated until
the ignition switch is turned OFF. When the ignition switch is turned ON, the rear sonar system will be
enabled. Depressing the rear sonar system OFF s witch again will enable the rear sonar system also.
Enabling the rear sonar system will cause the rear sonar system OFF indicator to go out. If the indicator light
is blinking there is a malfunction in the system.
SONAR BUZZER
With power and ground supplied to the sonar control unit and the A/T selector lever in R position, a stationary
object that is at least 7.0 cm (2.8 in.) wide and 1.0 m (39. 0 in.) tall and that is closer than 1.8 m (5.9 ft.) will be
detected by the rear sonar sensors, causing the sonar buzzer to sound a tone. As the vehicle moves closer to
the object, the rate of the tone will increase. When the object is less than 25.0 cm (10 in.) from the rear
bumper, the tone will sound continuously.
REAR SONAR SENSORS
With power and ground supplied to the rear sonar sens ors, the sonar sensors transmit an ultrasonic signal.
This signal is reflected back to the sensor by objects large enough and close enough to be detected. The rear
sonar sensors measure the time from the transmitted si gnal to the time the signal is reflected back and sends
this information to the sonar control unit.
BACK-UP LAMP RELAY
The back-up lamp relay provides a reverse signal to the sonar control unit.
AWNIA1499GB
Revision: December 20092009 QX56

SN
REAR SONAR SYSTEMSN-7
< FUNCTION DIAGNOSIS >
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Component Parts LocationINFOID:0000000004173797
Component DescriptionINFOID:0000000004173798
Self-Diagnosis FunctionINFOID:0000000004173799
There are four modes of self-diagnosis. Thes e modes must be followed in the following order:
1. Entering diagnostics mode
2. Requesting number of fault codes mode
3. Requesting fault codes mode
4. Clearing fault codes mode
Self-diagnosis can be manually exited by turning the igni tion OFF or selecting reverse gear. Self-diagnosis will
exit unless a fault code request occurs before a me ssage is repeated five times without acknowledgement.
ENTERING DIAGNOSTICS MODE
1. Sonar control unit B24
(view with luggage side finisher LH removed) 2. Back-up lamp relay M73 3. A/T assembly F9
4. Sonar buzzer M47 5. Rear sonar system OFF switch
M117
(with sonar system OFF indicator) 6. Rear sonar sensor LH outer C102
7. Rear sonar sensor LH inner C103 8. Rear sonar sensor RH inner C104 9. Rear sonar sensor RH outer C105
AWNIA1588ZZ
Component Function
Sonar control unit Controls sonar system and provides self-diagnosis
Back-up lamp relay Provides reverse signal for sonar control unit
A/T assembly Controls back-up lamp relay
Sonar buzzer Sounds a signal when objects are detected in the rear of the vehicle
Rear sonar system OFF switch Enables the driver to turn system off and signals a system malfunction
Sonar sensor Senses objects in the rear of the vehicle
Revision: December 20092009 QX56