2004 INFINITI QX56 ECU

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Page 862 of 3371

INFINITI QX56 2004 Factory Service Manual VEHICLE SECURITY (THEFT WARNING) SYSTEM
BL-97
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Combination Meter (Security Indicator Lamp) CheckEIS002SP
1. SECURITY INDICATOR LAMP ACTIVE TEST

Page 863 of 3371

INFINITI QX56 2004 Factory Service Manual BL-98
VEHICLE SECURITY (THEFT WARNING) SYSTEM
Revision: August 20072004 QX56
3. CHECK HARNESS CONTINUITY
1. Turn ignition switch OFF.
2. Disconnect BCM and combination meter (security indicator lamp).

Page 864 of 3371

INFINITI QX56 2004 Factory Service Manual VEHICLE SECURITY (THEFT WARNING) SYSTEM
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2. CHECK DOOR KEY CYLINDER SWITCH LH GROUND HARNESS
Check continuity between front door lock asse

Page 865 of 3371

INFINITI QX56 2004 Factory Service Manual BL-100
VEHICLE SECURITY (THEFT WARNING) SYSTEM
Revision: August 20072004 QX56
Vehicle Security Horn Alarm CheckEIS002SR
1. CHECK HORN OPERATION
Check if horn sounds with horn switch.
Does horn operate

Page 867 of 3371

INFINITI QX56 2004 Factory Service Manual BL-102
AUTOMATIC BACK DOOR SYSTEM
Revision: August 20072004 QX56
System DescriptionEIS002SV
The automatic back door system consists of a one piece unit that combines the back door control unit along
w

BL-102
AUTOMATIC BACK DOOR SYSTEM
Revision: August 20072004 QX56
System DescriptionEIS002SV
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 remote keyless entry 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 remote keyless entry 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.

Page 868 of 3371

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 pulle

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.

Page 869 of 3371

INFINITI QX56 2004 Factory Service Manual 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 con

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.

Page 881 of 3371

INFINITI QX56 2004 Factory Service Manual BL-116
AUTOMATIC BACK DOOR SYSTEM
Revision: August 20072004 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. Wh

BL-116
AUTOMATIC BACK DOOR SYSTEM
Revision: August 20072004 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 ChartEIS002T1
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-117
3. Back door clutch diagnosis result Back door clutch does not operateBL-124
4. Back door motor diagnosis resultBack door motor does not operate (no operat-
ing current)BL-117
5. Cinch latch motor diagnosis resultCinch latch motor does not operate (no oper-
ating current)BL-128
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-118
Park switch —
Power window serial linkBL-114
Pinch strip system inspectionBL-122
Automatic operations are not carried out together with open/close
operations.
(Manual operations are normal.)Power liftgate switch system inspectionBL-118Back door close switch system inspectionBL-120
Auto back door power supply and ground cir-
cuit system inspection.BL-117
The auto closure function does not operate.
(Stops at the halfway position for auto closing operations.)Pinch strip system inspectionBL-122

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