2005 INFINITI QX4 key battery

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

AUTOMATIC BACK DOOR SYSTEM
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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

IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS)
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Trouble DiagnosesEIS008S4
SYMPTOM MATRIX CHART 1
Self-diagnosis related item
*: When IVIS (NATS) detects a malfunction, the security indicator lights up while ignition key is in the “ON” position.SymptomDisplayed “SELF-DIAG
RESULTS” on CON-
SULT-II screen.Diagnostic Procedure
(Reference page)System
(Malfunctioning part or
mode)Reference Part No. Of
Illustration On System
Diagram

Security indicator
lighting up*

Engine cannot be
startedCHAIN OF ECM-IMMU
[P1612]PROCEDURE 1
(BL-147
)In rare case, “CHAIN OF
ECM-IMMU” might be
stored during key regis-
tration procedure, even if
the system is not mal-
functioning.—
Open circuit in battery
voltage line of BCM cir-
cuitC1
Open circuit in ignition
line of BCM circuitC2
Open circuit in ground
line of BCM circuitC3
Open or short circuit
between BCM and ECM
communication lineC4
ECM B
BCM A
DIFFERENCE OF KEY
[P1615]PROCEDURE 2
(BL-148
)Unregistered key D
BCM A
CHAIN OF IMMU-KEY
[P1614]PROCEDURE 5
(BL-151
)Malfunction of key ID
chipE5
Communication line
between ANT/ AMP and
BCM:
Open circuit or short cir-
cuit of battery voltage
line or ground lineE1
E2
Open circuit in power
source line of ANT/ AMP
circuitE3
Open circuit in ground
line of ANT/ AMP circuitE4
NATS antenna amp. E6
BCM A
ID DISCORD, IMM-ECM
[P1611]PROCEDURE 3
(BL-149
)System initialization has
not yet been completed.F
ECM B
LOCK MODE
[P1610]PROCEDURE 4
(BL-150
)LOCK MODE D
Security indicator light-
ing up*DON'T ERASE
BEFORE CHECKING
ENG DIAGWORK FLOW
(BL-144
)Engine trouble data and
IVIS (NATS) trouble data
have been detected in
ECM—

IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS)
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Revision: October 20052005 QX56
Diagnostic Procedure 1EIS008S5
Self-diagnostic results:
“CHAIN OF ECM-IMMU” displayed on CONSULT-II screen
First perform the “SELF-DIAG RESULTS” in “BCM” with CONSULT-II, then perform the trouble diagno-
sis of malfunction system indicated “SELF-DIAG RESULTS” of “BCM”. Refer to BL-141, "
CONSULT-II"
.
1. CONFIRM SELF-DIAGNOSTIC RESULTS
Confirm SELF-DIAGNOSTIC RESULTS “CHAIN OF ECM-IMMU”
displayed on CONSULT-II screen.
NOTE:
In rare case, “CHAIN OF ECM-IMMU” might be stored during key
registration procedure, even if the system is not malfunctioning.
Is CONSULT-II screen displayed as above?
YES >> GO TO 2.
NO >> GO TO BL-145, "
SYMPTOM MATRIX CHART 1" .
2. CHECK POWER SUPPLY CIRCUIT FOR BCM
1. Turn ignition switch OFF.
2. Disconnect BCM.
3. Check voltage between BCM connector M20 terminal 70 and ground.
OK or NG
OK >> GO TO 3.
NG >> Check the following:

50A fusible link (letter f , located in fuse and fusible
link box)

Harness for open or short between fuse and BCM
connector. Ref. Part No. C1
3. CHECK IGN SW. ON SIGNAL
1. Turn ignition switch ON.
2. Check voltage between BCM connector M18 terminal 38 and ground.
OK or NG
OK >> GO TO 4.
NG >> Check the following:

10A fuse [No. 59, located in the fuse and relay box]

Harness for open or short between fuse and BCM
connector. Ref. part No. C2
PIIA1260E
70 - Ground :Battery voltage
LIIA1279E
38 - Ground :Battery voltage
LIIA0527E

BL-152
IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS)
Revision: October 20052005 QX56
4. CHECK POWER SUPPLY FOR NATS ANTENNA AMP.
1. Turn ignition switch ON.
2. Check voltage between NATS antenna amp. connector M21 terminal 1 and ground.
OK or NG
OK >> GO TO 5.
NG >> Repair or replace fuse or harness. Ref. part No. E3
5. CHECK NATS ANTENNA AMP. SIGNAL LINE- 1
Check voltage between NATS antenna amp. connector M21 terminal
2 and ground with analog tester.
OK or NG
OK >> GO TO 6.
NG >>

Repair or replace harness.
NOTE:
If harness is OK, replace BCM, perform initialization with CONSULT-II. For initialization, refer to
“CONSULT-II Operation Manual NATS-IVIS/NVIS”. 1 - Ground :Battery voltage
LIIA1498E
LIIA1642E
Connector terminals
(wire colors)
Position of ignition key cylinderVoltage (V)
(Approx.)
( + ) ( - )
2 GroundBefore inserting ignition key Battery voltage
After inserting ignition keyPointer of tester should move for approx. 30 seconds,
then return to battery voltage
Just after turning ignition
switch ONPointer of tester should move for approx. 1 second,
then return to battery voltage

IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS)
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6. CHECK NATS ANTENNA AMP. SIGNAL LINE- 2
Check voltage between NATS antenna amp. connector M21 terminal
4 and ground with analog tester.
OK or NG
OK >> GO TO 7.
NG >>

Repair or replace harness.
NOTE:
If harness is OK, replace BCM, perform initialization with CONSULT-II. For initialization, refer to
“CONSULT-II Operation Manual NATS-IVIS/NVIS”.
7. CHECK NATS ANTENNA AMP. GROUND LINE CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect NATS antenna amp. connector.
3. Check continuity between NATS antenna amp. connector M21 terminal 3 and ground.
OK or NG
OK >> NATS antenna amp. is malfunctioning. Ref. part No. E6
NG >>

Repair or replace harness.
NOTE:
If harness is OK, replace BCM, perform initialization
with CONSULT-II. For initialization, refer to “CON-
SULT-II Operation Manual NATS-IVIS/NVIS”.
LIIA1643E
Connector terminals
(wire colors)
Position of ignition key cylinderVoltage (V)
(Approx.)
( + ) ( - )
4 GroundBefore inserting ignition key Battery voltage
After inserting ignition keyPointer of tester should move for approx. 30 seconds,
then return to battery voltage
Just after turning ignition
switch ONPointer of tester should move for approx. 1 second,
then return to battery voltage
3 - Ground :Continuity should exist.
LIIA1283E

WARNING CHIME
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Revision: October 20052005 QX56
3. Seat belt warning chime
IGNITION KEY WARNING CHIME
With the key inserted in the ignition switch, the ignition switch in OFF position, and the driver's door open, the
warning chime will sound.
Power is supplied

through key switch and key lock solenoid terminal 4

to BCM terminal 37.
Ground is supplied

to BCM terminal 47

through front door switch LH terminal 2.
Front door switch LH is case grounded.
BCM detects key inserted into the ignition switch, and sends key warning signal to combination meter via CAN
communication lines. When the combination meter receives key warning signal, it sounds warning chime.
LIGHT WARNING CHIME
With the key removed from the ignition switch, the driver's door open, and the lighting switch (part of the com-
bination switch) in 1st or 2nd position, the warning chime will sound. [Except when headlamp battery saver
control operates (5 minutes after ignition switch is turned to OFF or ACC position) and headlamps do not illu-
minate.]
Signal is supplied

from combination switch (lighting switch) terminals 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10

to BCM terminals 2, 3, 4, 5, 6, 32, 33, 34, 35 and 36.
NOTE:
BCM detected lighting switch in 1st or 2nd position. Refer to BCS-3, "
COMBINATION SWITCH READING
FUNCTION" .
Ground is supplied

to BCM terminal 47

through front door switch LH terminal 2.
Front door switch LH is case grounded.
BCM detects headlamps are illuminated, and sends light warning signal to combination meter CAN communi-
cation lines. When the combination meter receives light warning signal, it sounds warning chime.
SEAT BELT WARNING CHIME
When the ignition switch is turned ON with the seat belt unfastened [seat belt buckle pre-tensioner assembly
(seat belt buckle switch) LH unfastened], warning chime will sound for approximately 6 seconds.
Ground is supplied

to combination meter terminal 27

through seat belt buckle pre-tensioner assembly (seat belt buckle switch) LH terminal 1.
Seat belt buckle pre-tensioner assembly (seat belt buckle switch) LH terminal 2 is grounded through body
grounds B7 and B19.
The combination meter sends seat belt buckle switch LH unfastened signal to BCM via CAN communication
line.
BCM receives seat belt buckle pre-tensioner assembly (seat belt buckle switch) LH unfastened signal from
combination meter via CAN communication line, and sends seat belt warning signal to the combination meter
via CAN communication line. When the combination meter receives the seat belt warning signal, it sounds the
warning chime. The BCM controls the (6 second) duration of the seat belt warning chime.
CAN Communication System DescriptionEKS00BCQ
Refer to LAN-5, "CAN COMMUNICATION" .