2005 INFINITI QX4 warning

BL-102
AUTOMATIC BACK DOOR SYSTEM
Revision: October 20052005 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

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 close switch position. If the back door close switch is in the
OFF position, the back door operates in the open direction until it is fully open. If the back door close
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.

AUTOMATIC BACK DOOR SYSTEM
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Revision: October 20052005 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 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
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-
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
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 Closed OFFCancels power door open oper-
ation, door will release to man-
ual mode.
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
recovered)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
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 resetControl not possible because microcom-
puter being reset

BL-104
AUTOMATIC BACK DOOR SYSTEM
Revision: October 20052005 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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Revision: October 20052005 QX56
Terminals and Reference Value for Back Door Control UnitEIS008R7
Te r m i n a l Wire
ColorItem ConditionVoltage (V)
(Approx.)
1 B Ground — —
2 B Ground — —
3 Y/R Battery power supply — Battery voltage
4 G Hazard lamp output Request to flash hazardsPulse must be >50ms
but less than 250ms
5 B/P Pinch strip ground — —
6 R Warning chime output Back door motor active Battery voltage
7 G/R Ignition switchIgnition switch ON Battery voltage
Ignition switch OFF 0
8 GR/B Back door close switchCLOSE position (ON) 0
NEUTRAL position (OFF) Battery voltage
9 L Warning chime ground — —
10 L/B Battery power supply — Battery voltage
11 YCinch latch motor
CLOSE outputBack door close operation Battery voltage
12 LClosure motor
RETURN outputBack door release operation Battery voltage
13 P/LBack door close switch
(While operating back door)CANCEL position (ON) 0
NEUTRAL position (OFF) 9
14 P Close switch signal While fully opening back door
15 O/L Open switch signal While fully closing back door
17 GR Glass hatch ajar signalGlass hatch OPEN 0
Glass hatch CLOSED 5
18 GR/R Park switchP or N position (Ignition is ON) 0
Other (Ignition is ON) 9
19 BR/B Pinch strip RHDetecting obstruction 0
Other 4
20 V/G Pinch strip LHDetecting obstruction 0
Other 4
PIIA3278E
W IIA1047E
PIIA2171E

AUTOMATIC BACK DOOR SYSTEM
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Revision: October 20052005 QX56
Trouble Diagnosis ProcedureEIS008R9
1. Check the trouble symptom and customer's requests.
2. Understand outline of system. Refer to BL-45, "
System Description" .
3. Confirm system operation.
4. Perform self-diagnosis procedures. Refer to BL-113, "
Self-Diagnosis Procedures" .
5. Refer to diagnosis chart by symptom, repair or replace any malfunctioning parts. Refer to BL-114, "
Diag-
nosis Chart" .
6. Inspection End.
Self-Diagnosis ProceduresEIS008RA
INPUT SIGNAL CHECK MODE
Input signal check mode allows testing of switch input signal to the back door control unit.
To activate input signal check mode on the automatic back door, perform the following steps:
1. Turn ignition switch OFF.
2. Turn back door close switch to CANCEL (system cancelled).
3. Place A/T selector lever in P position.
4. Using the inside emergency release lever, open the back door.
5. Have an assistant press and hold the back door handle switch.
6. While the assistant continues to hold the back door handle switch, turn ignition switch ON (DO NOT start
engine).
7. After approximately 5 seconds, the back door warning chime will sound for 0.5 seconds.
8. Release the back door handle switch.
9. Within 8 seconds of the back door warning chime sounding, press and hold the power liftgate switch.
10. After approximately 5 seconds, the back door warning chime will sound for 1 second.
11. Release the power liftgate switch.
12. The input signal check mode is now initialized.
The input signal check mode can test the following inputs. The back door warning chime will sound for approx-
imately 0.5 seconds each time a switch signal input occurs. Use this test when one of these inputs is not
responding during normal automatic back door operation.
*Back door warning chime should sound as soon as vehicle moves.
Turn ignition switch OFF to end input signal check mode.
OPERATING CHECK MODE
Operating check mode allows self-diagnosis of the automatic back door system.
To activate operating check mode on the automatic back door, perform the following steps:
1. Turn ignition switch OFF.
2. Turn back door close switch to CANCEL (system cancelled).
3. Place A/T selector lever in P position.
Switch signal Operation Refer to
Power liftgate switch OFF → ONBL-116
Back door close switch (CLOSE) OFF → ONBL-118
Back door close switch (CANCEL) OFF → ONBL-119
Back door handle switch OFF → ONBL-125
Glass switch OFF → ONBL-117
A/T device (park switch) P position → other than P positionAT-6 0
Vehicle speed* Vehicle speed —
Remote keyless entry signal Keyfob switch OFF → ONBL-44
Door lock/unlock signal LOCK → UNLOCKBL-16
Pinch strip LH signal OFF → ONBL-121
Pinch strip RH signal OFF → ONBL-121

BL-114
AUTOMATIC BACK DOOR SYSTEM
Revision: October 20052005 QX56
4. Using the inside emergency release lever, open the back door.
5. Have an assistant press and hold the back door handle switch.
6. While the assistant continues to hold the back door handle switch, turn ignition switch ON (DO NOT start
engine).
7. After approximately 5 seconds, the back door warning chime will sound for 0.5 seconds.
8. Release the back door handle switch.
9. Within 8 seconds of the back door warning chime sounding, press the power liftgate switch 5 times in
rapid succession.
10. After approximately 5 seconds, the back door warning chime will sound for 1 second.
11. Release the power liftgate switch.
12. Immediately close the back door manually.
13. Press and release the power liftgate switch to activate operating check mode.
Self-diagnosis results are indicated by the back door warning chime.
Turn ignition switch OFF to end input signal check mode.
Diagnosis ChartEIS008RB
Back door warning chime order Back door warning chime length
Start self-diagnosis1.5 seconds
OK NG
1. Operating conditions diagnosis 0.5 seconds 0.2 seconds
2. Back door encoder diagnosis 0.5 seconds 0.2 seconds
3. Back door clutch diagnosis 0.5 seconds 0.2 seconds
4. Back door motor diagnosis 0.5 seconds 0.2 seconds
5. Cinch latch motor diagnosis 0.5 seconds 0.2 seconds
Restart self-diagnosis 1.5 seconds
Item NG Result Refer to
1. Operating conditions diagnosis resultOne of the following operating conditions no
longer met: ignition switch ON, back door
close switch (CANCEL) ON, A/T selector lever
in P position—
2. Back door encoder diagnosis resultSensor diagnosis/short, pulse signal, pulse
signal directionBL-135
3. Back door clutch diagnosis result Back door clutch does not operateBL-135
4. Back door motor diagnosis resultBack door motor does not operate (no operat-
ing current)BL-135
5. Cinch latch motor diagnosis resultCinch latch motor does not operate (no oper-
ating current)BL-135
Symptom Suspect systems Refer to
Automatic operations are not executed from the back door fully
closed or fully open position.
(Auto closure operates normally.)Power liftgate switch system inspectionBL-116
Park switch —
Power window serial linkBL-112
Pinch strip system inspectionBL-121
Automatic operations are not carried out together with open/close
operations.
(Manual operations are normal.)Power liftgate switch system inspectionBL-116Back door close switch system inspectionBL-118
Auto back door power supply and ground cir-
cuit system inspection.BL-115
The auto closure function does not operate.
(Stops at the halfway position for auto closing operations.)Pinch strip system inspectionBL-121

AUTOMATIC BACK DOOR SYSTEM
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Revision: October 20052005 QX56
Back Door Power Supply and Ground Circuit InspectionEIS008RC
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-125
When the keyfob is operated, the back door does not operate
automatically.Remote keyless entry system inspectionBL-44Power window serial linkBL-112
Pinch strip system inspectionBL-121
Auto closure does not operate.Half-latch switch systemBL-122Cinch latch motor systemBL-126
Handle switch systemBL-125
The back door does not open.
(Closure motor rotation is not reversed.)Open switch systemBL-123
Handle switch systemBL-125
Warning chime does not sound. Back door warning chime systemBL-122
Auto closure operation works, but the back door is not fully
closedClose switch systemBL-124Handle switch systemBL-125
Cinch latch motor systemBL-126
Back door latch assembly mechanism dam-
aged or worn.— Symptom Suspect systems Refer to
3 - Ground : Approx. battery voltage
10 - Ground : Approx. battery voltage
WIIA0567E
1 - Ground : Continuity should exist.
2 - Ground : Continuity should exist.
LIIA0801E

BL-122
AUTOMATIC BACK DOOR SYSTEM
Revision: October 20052005 QX56
Back Door Warning Chime System InspectionEIS008RH
1. BACK DOOR WARNING CHIME CIRCUIT INSPECTION
1. Disconnect back door warning chime and back door control unit.
2. Check continuity between back door warning chime connector
D514 terminal 1 and back door control unit connector B55 termi-
nal 6.
OK or NG
OK >> GO TO 2.
NG >> Repair or replace harness.
2. WARNING CHIME CIRCUIT INSPECTION
Check continuity between back door warning chime connector D514
terminal 2 and back door control unit connector B55 terminal 9.
OK or NG
OK >> Replace warning chime.
NG >> Repair or replace harness.
Half-Latch Switch System InspectionEIS008RI
1. HALF-LATCH SWITCH SIGNAL INSPECTION
1. Turn ignition switch OFF.
2. While fully opening and closing the back door, check voltage
between back door control unit connector B55 terminal 22 and
ground.
OK or NG
OK >> Half-latch switch is OK.
NG >> GO TO 2.1 - 6 : Continuity should exist.
LIIA0822E
2 - 9 : Continuity should exist.
LIIA2182E
22 - Ground
LIIA0826EPIIA2169E