2006 INFINITI QX56 Factory Service Manual

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INFINITI QX56 2006 Factory Service Manual BL-100
AUTOMATIC BACK DOOR SYSTEM
Revision: November 20092006 QX56
System DescriptionEIS0060X
NOTE:
The automatic back door system must be initialized by fully closing the back door anytime the batter

BL-100
AUTOMATIC BACK DOOR SYSTEM
Revision: November 20092006 QX56
System DescriptionEIS0060X
NOTE:
The automatic back door system must be initialized by fully closing the back door anytime the battery
or the back door control unit has been disconnected.
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, remote keyless entry 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 bat-
tery 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
terminal 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 bat-
tery 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
terminal 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.

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Back Door Handle Switch Operation (Fully Closed → Fully Open Operation)
When the back door handle is pul

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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
position) 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 signal to the BCM through terminal 4 to flash the hazard lamps and unlocks the back door latch through
terminal 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 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.

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INFINITI QX56 2006 Factory Service Manual BL-102
AUTOMATIC BACK DOOR SYSTEM
Revision: November 20092006 QX56
Back Door Close Switch Operation (Fully Open → Fully Closed Operation)
When the back door close switch is pressed, the back door c

BL-102
AUTOMATIC BACK DOOR SYSTEM
Revision: November 20092006 QX56
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.
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
sounding the warning chime. The back door cannot be opened using the switches until the gas stay mal-
function 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.

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INFINITI QX56 2006 Factory Service Manual AUTOMATIC BACK DOOR SYSTEMBL-103
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Revision: November 2009 2006 QX56
Auto Back Door Operation Enable Conditions
Control When Operating Enable Conditions Not Met During Power Op

AUTOMATIC BACK DOOR SYSTEMBL-103
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Revision: November 2009 2006 QX56
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 switchRemote keyless entry Back door handle switch Back door
close switch
Operating direction Fully closed
→
open Fully open
→
closed Fully closed
→
open Fully open
→ closed Fully closed
→
open Fully open
→
closed Fully open
→
closed
Close
switch CANCEL or NEUTRAL
NEUTRALNEUTRAL
Vehicle stop
condition A/T selector
lever in P or N
range and vehi-
cle speed less
than 2 km/h or ignition switch
in OFF position —A/T selector
lever in P or N
range and vehi-
cle speed less
than 2 km/h or ignition switch
in OFF position —A/T selector
lever in P or N
range and vehi-
cle speed less
than 2 km/h or ignition switch
in OFF position ——
Battery volt-
age Approx. 11V or more
Back door
lock status ————
Unlocked——
Glass hatch Closed
ItemsOperation condition Not met caseControl
A/T selector lever P position P or N position with ignition ON
or any position with ignition
OFFOther
Continue power open or close,
but sounds warning chime.
Back door close switch NEUTRAL CANCEL
Cancels power open/close
operation 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 ClosedOFF Cancels power door open oper-
ation, door will release to man-
ual mode.
Description
Operation Control
Back door close switch turned to CANCEL Warning 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 ON Warning chime active and one-way opera-
tion continuous
(Warning chime inactive and door fully
open or fully closed or operating conditions
recovered)Full open: power close operation allowed
Full close: operating conditions not met
→
no power open function.
Voltage drop 11 - 9V One-way operation continued (equivalent
to the case of starting voltage
← 11 V f o r
handle operation with warning chime
active) 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 reset Control not possible because microcom-
puter being reset

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INFINITI QX56 2006 Factory Service Manual BL-104
AUTOMATIC BACK DOOR SYSTEM
Revision: November 20092006 QX56
Warning Chime Active Conditions
The warning chime uses two types of audio warnings, a friendly chime and a warning chime. The friendl

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INFINITI QX56 2006 Factory Service Manual AUTOMATIC BACK DOOR SYSTEMBL-105
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Revision: November 2009 2006 QX56
SchematicEIS0060Y
WIWA1543E

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INFINITI QX56 2006 Factory Service Manual BL-106
AUTOMATIC BACK DOOR SYSTEM
Revision: November 20092006 QX56
Wiring Diagram — B/CLOS —EIS0060Z
WIWA2211E

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INFINITI QX56 2006 Factory Service Manual AUTOMATIC BACK DOOR SYSTEMBL-107
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Revision: November 2009 2006 QX56
WIWA0174E

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