Revers INFINITI QX56 2004 Factory Service Manual

AUTOMATIC BACK DOOR SYSTEM
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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 remote keyless entry switch is pressed for at least 0.5 seconds, the back door control unit termi-
nal 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.

BL-104
AUTOMATIC BACK DOOR SYSTEM
Revision: August 20072004 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 disable 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

If the power liftgate switch, remote keyless entry switch or the back door close switch is pressed during
back door power open and close operation, the back door will reverse direction.

If the outside handle switch is pulled during power open or power close, the power back door will automat-
ically stop and go to manual mode.
Anti-Pinch Function

During auto open or close operation, if an object is detected in the door's path, the back door operates in
the reverse direction until fully closed or open to prevent pinching.

During auto close operation, if an object is detected by the pinch strips in the door's path, the back door
operates in the open direction until it is fully open.

During auto cinch latch operation, if an object is detected by the pinch strips in the door's path, the back
door operates depending on the back door disable switch position. If the back door disable switch is in the
OFF position, the back door operates in the open direction until it is fully open. If the back door disable
switch is in the ON position, the back door will reverse only until the latch is fully released.

If the pinch strips are present but are not functioning properly (permanently sensing a pinch), the auto-
matic back door system will operate in the open direction only.

If the pinch strips are not connected to the automatic back door system, it will not operate.
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 failure of the gas stays is detected, the back door control unit will close the back door while sounding
the warning chime.
Warning Functions

The warning chime is sounded according to the back door operating state, operations, and conditions.

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AUTOMATIC BACK DOOR SYSTEM
Revision: August 20072004 QX56
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
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).

AUTOMATIC BACK DOOR SYSTEM
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Back Door Power Supply and Ground Circuit InspectionEIS002T2
1. BACK DOOR POWER SUPPLY CIRCUIT INSPECTION
1. Turn ignition switch OFF.
2. Disconnect back door control unit.
3. Check voltage between back door control unit connector B55
terminals 3, 10 and ground.
OK or NG
OK >> GO TO 2.
NG >> Repair or replace harness.
2. BACK DOOR GROUND CIRCUIT INSPECTION
Check continuity between back door control unit connector B55 ter-
minal 1, 2 and ground.
OK or NG
OK >> Circuit is OK.
NG >> Repair or replace harness.
During auto closing operations, if obstruction is detected, the
door does not operate in reverse.Back door motor assembly —
During close or cinch operations, the door does not operate in
reverse if the back door handle is operated.Handle switch systemBL-127
When the keyfob is operated, the back door does not operate
automatically.Remote keyless entry system inspectionBL-44Power window serial linkBL-114
Pinch strip system inspectionBL-122
Auto closure does not operate.Half-latch switch systemBL-124Cinch latch motor systemBL-128
Handle switch systemBL-127
The back door does not open.
(Closure motor rotation is not reversed.)Open switch systemBL-125
Handle switch systemBL-127
Warning chime does not sound. Back door warning chime systemBL-123
Auto closure operation works, but the back door is not fully
closedClose switch systemBL-126Handle switch systemBL-127
Cinch latch motor systemBL-128
Back door latch assembly mechanism dam-
aged or worn.— Symptom Suspect systems Refer to
3 (Y/R) - Ground : Approx. battery voltage
10 (L/B) - Ground : Approx. battery voltage
WIIA0567E
1 (B) - Ground : Continuity should exist.
2 (B) - Ground : Continuity should exist.
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AUTOMATIC BACK DOOR SYSTEM
Revision: August 20072004 QX56
Cinch Latch Motor System InspectionEIS002TC
1. CINCH LATCH MOTOR CIRCUIT INSPECTION
1. Turn ignition switch OFF.
2. Disconnect back door latch and back door control unit.
3. Check continuity between back door control unit connector (A)
B55 terminals 11, 12 and back door latch (cinch latch motor)
connector (B) D503 terminals 1, 2.
4. Check continuity between back door latch (cinch latch motor)
connector (B) D503 terminals 1, 2 and ground.
OK or NG
OK >> GO TO 2.
NG >> Repair or replace harness.
2. CINCH LATCH MOTOR OPERATION INSPECTION
Connect battery power to terminals 1 and 2 on the back door latch
and check motor operation.
OK or NG
OK >> GO TO 3.
NG >> Replace the back door latch.
3. CINCH LATCH MOTOR SIGNAL INSPECTION
1. Reconnect back door latch and back door control unit.
2. While fully opening and closing the back door, check voltage
between back door control unit connector B55 terminals 11, 12
and ground.
OK or NG
OK >> Cinch latch motor circuit is OK.
NG >> Replace the back door control unit.1 (L) - 12 (L) : Continuity should exist.
2 (Y) - 11 (Y) : Continuity should exist.
1 (L) - ground : Continuity should not exist.
2 (Y) - ground : Continuity should not exist.
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1 (+) - 2 (-) : It operates.
1 (-) - 2 (+) : It operates. (Reverse rotation)
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11 (Y) - Ground
12 (L) - Ground
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DOOR
Revision: August 20072004 QX56
Removal and InstallationEIS0 02 TE
FRONT DOOR
CAUTION:

When removing and installing the door assembly, support the door with a jack and shop cloth to
protect the door and body.

When removing and installing door assembly, be sure to carry out the fitting adjustment.

Check the hinge rotating part for poor lubrication. If necessary, apply "body grease".
1. Remove the front door lock assembly. Refer to BL-132, "
FRONT DOOR LOCK" .
2. Remove the door harness.
3. Remove the check link cover.
4. Remove the bolt from the check link on the door hinge pillar.
5. Remove the door-side hinge nuts and bolts and the door assem-
bly.
Installation is in the reverse order of removal.
REAR DOOR
CAUTION:

When removing and installing the door assembly, support the door with a jack and shop cloth to
protect the door and body.

When removing and installing door assembly, be sure to carry out the fitting adjustment.

Check the hinge rotating part for poor lubrication. If necessary, apply "body grease".
1. Remove the rear door lock assembly. Refer to BL-135, "
REAR DOOR LOCK" .
2. Remove the door harness.
3. Remove the check link cover.
4. Remove the bolt from the check link on the door hinge pillar.
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DOOR
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5. Remove the door-side hinge nuts and bolts and the door assem-
bly.
Installation is in the reverse order of removal.
BACK DOOR
WA RN ING:
Always support the back door when removing or replacing back door stays. Power back door opener
will not support back door with back door stays removed.
1. Remove the back door glass. Refer to GW-13, "
REAR WINDOW GLASS AND MOLDING" .
2. Remove the license lamp finisher. Refer to EI-24, "
LICENSE LAMP FINISHER" .
3. Remove the back door lock assembly. Refer to BL-136, "
BACK DOOR LOCK" .
4. Remove the rear wiper motor. Refer to WW-51, "
Removal and Installation of Rear Wiper Motor" .
5. Remove the back door wire harness.
6. Remove the rear washer nozzle and hose from the back door. Refer to WW-52, "
Removal and Installation
of Rear Washer Nozzle"
CAUTION:
Two technicians should be used to avoid damaging the back door during removal.
7. Support the back door.
8. Disconnect the power back door lift arm from the door.
9. Remove the back door stays.
10. Remove the door side nuts and the back door assembly.
Installation is in the reverse order of removal.
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BL-134
FRONT DOOR LOCK
Revision: August 20072004 QX56
11. Separate the outside handle cable connection from the outside
handle bracket.
INSTALLATION
Installation in the reverse order of removal.
CAUTION:
To install each rod, be sure to rotate the rod holder until a click is felt.
Disassembly and AssemblyEIS006BL
DOOR KEY CYLINDER ASSEMBLY
Remove the key cylinder escutcheon pawl and remove the door key cylinder.
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REAR DOOR LOCK
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REAR DOOR LOCKPFP:82502
Component StructureEIS002TI
Removal and InstallationEIS002TJ
REMOVAL
1. Remove the rear door glass regulator. Refer to GW-73, "REAR DOOR GLASS REGULATOR" .
2. Remove door grommets, and the outside handle nuts from grommet hole.
3. Remove outside handle.
4. Disconnect the outside handle cable connection.
5. Remove the inside door handle actuator.
6. Disconnect the door lock actuator connector.
7. Remove the door lock actuator assembly.
INSTALLATION
Installation is in the reverse order of removal.
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BL-136
BACK DOOR LOCK
Revision: August 20072004 QX56
BACK DOOR LOCKPFP:90504
Power Back Door OpenerEIS0 02 TK
REMOVAL
1. Remove the LH luggage side upper. Refer to EI-39, "LUGGAGE FLOOR TRIM" .
2. Disconnect the power back door motor electrical connector.
3. Disconnect the ball socket from the back door.
4. Remove the power back door motor assembly.
INSTALLATION
Installation is in the reverse order of removal.
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