2007 INFINITI QX56 service

VEHICLE SECURITY (THEFT WARNING) SYSTEM
BL-77
< SERVICE INFORMATION >
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2. Check voltage between BCM harness connector M18 terminal
23 and ground.
OK or NG
OK >> Security indicator lamp is OK.
NG >> GO TO 2.
2.SECURITY INDICATOR LAMP CHECK
Check security indicator lamp condition.
Refer to DI-5
.
OK or NG
OK >> GO TO 3.
NG >> Replace combination meter (security indicator lamp). Refer to DI-5
.
3.CHECK HARNESS CONTINUITY
1. Turn ignition switch OFF.
2. Disconnect BCM and combination meter (security indicator lamp).
3. Check continuity between BCM connector (A) M18 terminal 23
and combination meter (security indicator lamp) harness con-
nector (B) M24 terminal 28.
4. Check continuity between BCM connector (A) M18 terminal 23
and ground.
OK or NG
OK >> Check the following:
• 10A fuse [No. 19, located in fuse block (J/B)]
• Harness for open or short between combination meter (security indicator lamp) and fuse
NG >> Repair or replace harness.
Front Door Lock Assembly LH (Key Cylinder Switch) CheckINFOID:0000000003532952
1.CHECK FRONT DOOR LOCK ASSEMBLY LH (KEY CYLINDER SWITCH)
With CONSULT-II
Check front door lock assembly LH (key cylinder switch) ("KEY CYL LK-SW") and ("KEY CYL UN-SW) in
DATA MONITOR mode in CONSULT–II.Refer to BL-70, "
CONSULT-II Function (BCM)".
• When key inserted in front key cylinder is turned to LOCK:
• When key inserted in front key cylinder is turned to UNLOCK:
Without CONSULT-II
ConnectorTe r m i n a l s
ConditionVoltage (V)
(Approx.)
(+) (-)
M18 23 GroundON 0
OFFBattery volt-
age
LIIA0523E
23 - 28 : Continuity should exist.
23 - ground : Continuity should not exist.
LIIA2253E
KEY CYL LK-SW : ON
KEY CYL UN-SW : ON
LIIA0188E

BL-78
< SERVICE INFORMATION >
VEHICLE SECURITY (THEFT WARNING) SYSTEM
Check voltage between main power window and door lock/unlock switch connector D7 terminals 4, 6 and
ground.
OK or NG
OK >> Front door lock assembly LH (key cylinder switch) signal is OK.
NG >> GO TO 2.
2.CHECK DOOR KEY CYLINDER SWITCH LH GROUND HARNESS
Check continuity between front door lock assembly LH (key cylinder
switch) connector (A) D14 terminal 5 and body ground.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace harness.
3.CHECK DOOR KEY CYLINDER SWITCH LH
Check continuity between front door lock assembly LH (key cylinder
switch) terminals.
OK or NG
OK >> GO TO 4.
NG >> Replace front door lock assembly LH (key cylinder switch). Refer to BL-110, "
Removal and Instal-
lation".
4.CHECK DOOR KEY CYLINDER HARNESS
ConnectorTe r m i n a l s
ConditionVoltage (V)
(Approx.)
(+) (–)
D74
GroundNeutral/Unlock 5
Lock 0
6Neutral/Lock 5
Unlock 0
LIIA0566E
Connector Terminals Continuity
D14 5 – Ground Yes
WIIA0755E
Terminals Condition Continuity
1 – 5 Key is turned to UNLOCK or neutral. No
Key is turned to LOCK. Yes
5 – 6Key is turned to LOCK or neutral. No
Key is turned to UNLOCK. Yes
LIIA1573E

VEHICLE SECURITY (THEFT WARNING) SYSTEM
BL-79
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Check continuity between main power window and door lock/unlock
switch connector (A) D7 terminals 4, 6 and front door lock assembly
LH (key cylinder switch) connector (B) D14 terminals 1, 6 and body
ground.
OK or NG
OK >> Replace main power window and door lock/unlock switch.
NG >> Repair or replace harness.
Vehicle Security Horn Alarm CheckINFOID:0000000003532953
1.CHECK HORN OPERATION
Check if horn sounds with horn switch.
Does horn operate?
YES >> Check harness for open or short between IPDM E/R and horn relay.
NO >> Check horn circuit. Refer to WW-43
.
Vehicle Security Headlamp Alarm CheckINFOID:0000000003532954
1.CHECK VEHICLE SECURITY HEADLAMP ALARM OPERATION
Check if headlamps operate with lighting switch.
Do headlamps come on when turning switch ON?
YES >> Headlamp alarm is OK.
NO >> Check headlamp system. Refer to LT- 5
or LT- 2 4.
Door Lock/Unlock Switch CheckINFOID:0000000003532955
1.CHECK DOOR LOCK/UNLOCK SWITCH INPUT SIGNAL
Check if power door lock operates with door lock/unlock switch.
Do doors lock/unlock when using each door lock/unlock switch?
YES >> Door lock/unlock switch is OK.
NO >> Refer to "Door Lock/Unlock Switch Check ".
Connector Terminals Connector Terminals Continuity
A: Main
power win-
dow and
door lock/
unlock
switch4 B: Front
door lock
assembly
LH (key
cylinder
switch)1Yes
66Yes
4, 6 Ground No
WIIA0756E

BL-80
< SERVICE INFORMATION >
AUTOMATIC BACK DOOR SYSTEM
AUTOMATIC BACK DOOR SYSTEM
Component Parts and Harness Connector LocationINFOID:0000000003532956
System DescriptionINFOID:0000000003532957
NOTE:
LIIA2059E

AUTOMATIC BACK DOOR SYSTEM
BL-81
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The automatic back door system must be initialized by fully closing the back door anytime the battery
power is lost to the back door control unit.
The automatic back door system consists of a one piece unit that combines the back door control unit along
with the back door motor, back door clutch and the back door encoder. The back door latch contains a lock
function that can control the two functions of automatic back door latch closure and electrical opener with a
single motor when you close the back door to the halfway-state.
• Back door auto closure
When the back door is closed to the halfway state (half-latch) position, the motor automatically drives to
rotate the latch lever and pull it in from half latched to full latched.
• Power back door
With the back door closed, press the power liftgate switch or press the keyfob button, or pull the back door
handle with the back door unlocked, the back door latch motor opens the locking plate and releases the
latch. The back door motor then raises the door to the full open position.
With the back door fully open, press the power liftgate switch, keyfob button or the back door close switch,
the back door motor closes the door to the half-latch state. The back door latch motor then drives the latch to
the full close position.
At the onset of each power open or power close application, the hazard lamps will flash 3 times and the
warning chime will sound 3 times lasting a total of 2 seconds.
OPERATION DESCRIPTION
Power Liftgate Switch Operation (Fully Closed → Fully Open Operation)
• When the power liftgate switch is pressed, back door control unit terminal 23 receives the signal.
• The back door control unit checks the A/T selector lever (P position) through terminal 18, vehicle speed
through terminal 21, ignition status through terminal 7, glass hatch is closed through terminal 17 and battery
voltage is present through terminal 3.
• When the back door control unit receives the signal, if the auto back door operating enable conditions are
met, it sends a 5 volt signal through terminal 6 and grounds terminal 9 to sound the warning chime, sends a
signal to the BCM through terminal 4 to flash the hazard lamps and unlocks the back door latch through ter-
minal 12.
• The back door control unit supplies power to the magnetic clutch and the back door motor and moves the
back door in the open direction. (At this time, it also executes speed control, input reverse, and anti-pinch
detection control.)
• When the back door is opened to the full-open position, the full-open position is detected by the encoder,
and the back door control unit switches the back door motor OFF and the magnetic clutch is pulsed and then
turned OFF.
• The back door is held in the fully open position by the gas stays.
Remote Keyless Entry Operation (Fully Closed → Fully Open Operation)
• When the keyfob button is pressed for at least 0.5 seconds, back door control unit terminal 21 receives the
signal.
• The back door control unit checks the A/T selector lever (P position) through terminal 18, vehicle speed
through terminal 21, ignition status through terminal 7, glass hatch is closed through terminal 17 and battery
voltage is present through terminal 3.
• When the back door control unit receives the signal, if the auto back door operating enable conditions are
met, it sends a 5 volt signal through terminal 6 and grounds terminal 9 to sound the warning chime, sends a
signal to the BCM through terminal 4 to flash the hazard lamps and unlocks the back door latch through ter-
minal 12.
• The back door control unit supplies power to the magnetic clutch and the back door motor and moves the
back door in the open direction. (At this time, it also executes speed control, input reverse, and anti-pinch
detection control.)
• When the back door is opened to the full-open position, the full-open position is detected by the encoder,
and the back door control unit switches the back door motor OFF and the magnetic clutch is pulsed and then
turned OFF.
• The back door is held in the fully open position by the gas stays.
Back Door Handle Switch Operation (Fully Closed → Fully Open Operation)
• When the back door handle is pulled, back door control unit terminal 26 receives the signal.
• The back door control unit checks that the back door is unlocked and checks the A/T selector lever (P posi-
tion) through terminal 18, vehicle speed through terminal 21, ignition status through terminal 7, glass hatch is
closed, battery voltage and back door close switch position through terminal 13.
• When the back door control unit receives the signal, if all auto back door operating enable conditions are
met, it sends a 5 volt signal through terminal 6 and grounds terminal 9 to sound the warning chime, sends a

BL-82
< SERVICE INFORMATION >
AUTOMATIC BACK DOOR SYSTEM
signal to the BCM through terminal 4 to flash the hazard lamps and unlocks the back door latch through ter-
minal 12.
• The back door control unit supplies power to the magnetic clutch and the back door motor and moves the
back door in the open direction. (At this time, it also executes speed control, input reverse, and anti-pinch
detection control.)
• When the back door is opened to the full-open position, the full-open position is detected by the encoder,
and the back door control unit switches the back door motor OFF and the magnetic clutch is pulsed and then
turned OFF.
• The back door is held in the fully open position by the gas stays.
Power Liftgate Switch Operation (Fully Open → Fully Closed Operation)
• When the power liftgate switch is pressed, the back door control unit terminal 23 receives the signal.
• The back door control units checks door position through the rotary encoder.
• When the back door control unit receives the signal, if the auto back door operating enable conditions are
met, it sends a signal through terminal 6 and grounds terminal 9 to sound the warning chime and sends a
signal to the BCM through terminal 4 to flash the hazard lamps.
• The back door control unit supplies power to the magnetic clutch and the back door motor and move the
back door in the close direction. (At this time, it also executes speed control, input reverse, and anti-pinch
detection control.)
• When the back door reaches the half-latch state, the half-latch switch detects this and the signal is sent to
the back door control unit terminal 22.
• When the back door control unit receives the half latch switch signal, it switches OFF the back door motor
and the magnetic clutch and operates the cinch latch motor.
• When the back door latch operates and full close is detected through terminal 14 of the back door control
unit, the cinch latch motor reverses to the neutral position and the back door auto closure operation ends
and the door is fully closed.
Remote Keyless Entry Operation (Fully Open → Fully Closed Operation)
• When the keyfob switch is pressed for at least 0.5 seconds, the back door control unit terminal 21 receives
the signal.
• The back door control units checks door position through the rotary encoder.
• When the back door control unit receives the signal, if the auto back door operating enable conditions are
met, it sends a signal through terminal 6 and grounds terminal 9 to sound the warning chime and sends a
signal to the BCM through terminal 4 to flash the hazard lamps.
• The back door control unit supplies power to the magnetic clutch and the back door motor and move the
back door in the close direction. (At this time, it also executes speed control, input reverse, and anti-pinch
detection control.)
• When the back door reaches the half-latch state, the half-latch switch detects this and the signal is sent to
the back door control unit terminal 22.
• When the back door control unit receives the half latch switch signal, it switches OFF the back door motor
and the magnetic clutch and operates the cinch latch motor.
• When the back door latch operates and full close is detected through terminal 14 of the back door control
unit, the cinch latch motor reverses to the neutral position and the back door auto closure operation ends
and the door is fully closed.
Back Door Close Switch Operation (Fully Open → Fully Closed Operation)
• When the back door close switch is pressed, the back door control unit terminal 8 receives the signal.
• The back door control units checks back door close switch terminal 13 status and door position (must be
fully opened), through rotary encoder and battery voltage.
• When the back door control unit receives the signal, if the auto back door operating enable conditions are
met, it sends a signal through terminal 6 and grounds terminal 9 to sound the warning chime and sends a
signal to the BCM through terminal 4 to flash the hazard lamps.
• The back door control unit supplies power to the magnetic clutch and the back door motor and move the
back door in the close direction. (At this time, it also executes speed control, input reverse, and anti-pinch
detection control.)
• When the back door reaches the half-latch state, the half-latch switch detects this and the signal is sent to
the back door control unit terminal 22.
• When the back door control unit receives the half latch switch signal, it switches OFF the back door motor
and the magnetic clutch and operates the cinch latch motor.
• When the back door latch operates and full close is detected through terminal 14 of the back door control
unit, the cinch latch motor reverses to the neutral position and the back door auto closure operation ends
and the door is fully closed.

AUTOMATIC BACK DOOR SYSTEM
BL-83
< SERVICE INFORMATION >
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P Reversal
The door will reverse direction during power open or close operation if the automatic door main switch, keyfob
or back door close switch is operated. A chime will sound to announce the reversal.
Anti-Pinch Function
• During auto operation, if an object is detected in the door's path, a warning chime sounds and the back door
operates in the reverse direction to prevent pinching.
• During auto close operation, if an object is detected by the pinch strips in the door's path, a warning chime
sounds and the back door operates in the open direction until it is fully open.
Gas Stay Check
• During each power open operation, the back door control unit monitors motor current draw to determine if
the gas stays are functioning properly.
• If a malfunction of the gas stays is detected, the back door control unit will close the back door while sound-
ing the warning chime. The back door cannot be opened using the switches until the gas stay malfunction is
repaired.
Warning Functions
• The hazard warning lamps flash and a warning chime is sounded according to the back door operating state,
operations, and conditions.
Auto Back Door Operation Enable Conditions
Control When Operating Enable Conditions Not Met During Power Open/Close
Control When Operating Enable Conditions No Longer Met
Operation Power liftgate switch Remote keyless entry Back door handle switchBack door
close switch
Operating
directionFully closed →
openFully open →
closedFully closed →
openFully open →
closedFully closed →
openFully open →
closedFully open →
closed
Close
switchCANCEL or NEUTRAL NEUTRAL NEUTRAL
Vehicle stop
conditionA/T selector le-
ver in P or N
range and vehi-
cle speed less
than 2 km/h or
ignition switch
in OFF position—A/T selector le-
ver in P or N
range and vehi-
cle speed less
than 2 km/h or
ignition switch
in OFF position—A/T selector le-
ver in P or N
range and vehi-
cle speed less
than 2 km/h or
ignition switch in
OFF position——
Battery volt-
ageApprox. 11V or more
Back door
lock status————Unlocked——
Glass hatch Closed
Items Operation condition Not met case Control
A/T selector lever P positionP or N position with ignition ON
or any position with ignition OFFOtherContinue power open or close,
but sounds warning chime.
Back door close switch NEUTRAL CANCEL
Cancels power open/close op-
eration or door will release to
manual mode. Voltage drop 11V or more11 > V > 9
9 > V > reset voltage
reset voltage > V No power function available
Handle switch Normal (GND) Error (OPEN)No operation. Cancel power
open/close release to manual.
Glass hatch Closed OFFCancels power door open oper-
ation, door will release to manu-
al mode.

BL-84
< SERVICE INFORMATION >
AUTOMATIC BACK DOOR SYSTEM
Warning Chime Active Conditions
The warning chime uses two types of audio warnings, a friendly chime and a warning chime. The friendly
chime consists of dings lasting 0.66 seconds each immediately followed by the next ding. The warning chime
consists of beeps lasting 0.33 seconds with a pause of 0.33 seconds between each beep.
Reverse Conditions
Description Operation Control
Back door close switch turned to CANCELWarning chime active
→ Shift to manual mode after full open or
close operation is complete
(Recovery to power mode when main
switch turned OFF or door fully closed)→ Shift to manual mode
A/T selector lever P or N position with igni-
tion switch ONWarning chime active and one-way opera-
tion continuous
(Warning chime inactive and door fully open
or fully closed or operating conditions re-
covered)Full open: power close operation allowed
Full close: operating conditions not met →
no power open function.
Voltage drop 11 - 9VOne-way operation continued (equivalent
to the case of starting voltage ← 11V for
handle operation with warning chime ac-
tive)Not allowed
Voltage drop less than 9V
(Microcomputer reset voltage - clutch hold
voltage)• Motor stopped
• Clutch may slip
• Control not possible because microcom-
puter being resetControl not possible because microcomput-
er being reset
Operation status Operation or conditions Warning chime pattern
When auto operation startsPower liftgate switch operation
Friendly chime
2 seconds, 3 dings Remote keyless entry operation
Back door handle switch operation
Back door close switch operation
When reverse operation startsWhen reverse request is detected from
power liftgate switch, remote keyless
entry or back door close switchFriendly chime
1.3 seconds, 2 dings
When obstacle is detectedWarning chime
2 seconds, 3 beeps
Operating at low voltage While opening or closing Warning chime
2 seconds, 3 beeps
A/T selector lever not in P positionBack door close operationFriendly chime
Continuously dings
Back door open operationWarning chime
Continuously beeps
(until close operation is started)
Type Overload reverse
Operation covered Both directions
Detection methodOperation speed and motor current change direction
Pinch strips during back door close operation
Non-reversed area• For about 0.5 seconds immediately after drive motor operation
starts
• Between full open and approx. 7° from full open
• Closure operation area (half switch - close switch)
Number of times reverse allowedOne reversal is allowed (if a second obstacle is detected during a
power open or close operation, the door reverts to manual mode).