Ins INFINITI QX56 2004 Factory Service Manual

VEHICLE SECURITY (THEFT WARNING) SYSTEM
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Revision: August 20072004 QX56
4. CHECK BACK DOOR SWITCH GROUND
Check continuity between back door latch connector terminal 8 and
ground.
OK or NG
OK >> Back door switch circuit is OK.
NG >> Repair or replace harness.
Hood Switch CheckEIS0039U
1. CHECK HOOD SWITCH
Check hood switch and hood fitting condition.
OK or NG
OK >> GO TO 2.
NG >> Adjust installation of hood switch.
2. CHECK HOOD SWITCH INPUT SIGNAL
With CONSULT-II
Check "HOOD SW" in "DATA MONITOR" mode with CONSULT-II.
Without CONSULT-II
Check voltage between IPDM E/R harness connector E122 terminal
41 and ground.
OK or NG
OK >> Hood switch circuit is OK.
NG >> GO TO 3.8 (B) - Ground : Continuity should exist.
LIIA0828E
When hood is open : HOOD SW ON
When hood is closed : HOOD SW OFF
LIIA0038E
ConnectorTerminal (Wire color)
Condition of
hoodVoltage (V)
(Approx.)
(+) (-)
E122 41 (Y/B) GroundOpen 0
Closed Battery voltage
WIIA0601E

VEHICLE SECURITY (THEFT WARNING) SYSTEM
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Revision: August 20072004 QX56
Combination Meter (Security Indicator Lamp) CheckEIS002SP
1. SECURITY INDICATOR LAMP ACTIVE TEST
With CONSULT-II
Check "THEFT IND” in "ACTIVE TEST" mode with CONSULT-II.
Without CONSULT-II
1. Disconnect BCM.
2. Check voltage between BCM harness connector M18 terminal
23 and ground.
OK or NG
OK >> Security indicator lamp is OK.
NG >> GO TO 2.
2. SECURITY INDICATOR LAMP CHECK
Check security indicator lamp condition.
Refer to DI-5, "
COMBINATION METERS" .
OK or NG
OK >> GO TO 3.
NG >> Replace combination meter (security indicator lamp). Refer to DI-25, "
Removal and Installation of
Combination Meter" .
LIIA0044E
ConnectorTerminal (Wire color)
ConditionVoltage (V)
(Approx.)
(+) (-)
M18 23 (G/O) GroundON 0
OFFBattery volt-
age
LIIA0523E

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).
3. Check continuity between BCM connector (A) M18 terminal 23
and combination meter (security indicator lamp) harness con-
nector (B) M24 terminal 28.
4. Check continuity between BCM connector (A) M18 terminal 23
and ground.
OK or NG
OK >> Check the following:

10A fuse [No. 19, located in fuse block (J/B)]

Harness for open or short between combination meter (security indicator lamp) and fuse
NG >> Repair or replace harness.
Front Door Lock Assembly LH (Key Cylinder Switch) CheckEIS002SQ
1. CHECK FRONT DOOR LOCK ASSEMBLY LH (KEY CYLINDER SWITCH)
With CONSULT-II
Check front door lock assembly LH (key cylinder switch) ("KEY CYL LK-SW") and ("KEY CYL UN-SW) in
DATA MONITOR mode in CONSULT–II.Refer to BL-27, "
DATA MONITOR" .

When key inserted in front key cylinder is turned to LOCK:

When key inserted in front key cylinder is turned to UNLOCK:
Without CONSULT-II
Check voltage between main power window and door lock/unlock switch connector D7 terminals 4, 6 and
ground.
OK or NG
OK >> Front door lock assembly LH (key cylinder switch) signal is OK.
NG >> GO TO 2.23 (G/O) - 28 (G/O) : Continuity should exist.
23 (G/O) - ground : Continuity should not exist.
LIIA2253E
KEY CYL LK-SW : ON
KEY CYL UN-SW : ON
LIIA0188E
Connec-
torTerminals (Wire
color)Condition of key cylinder
switchVoltage (V)
(Approx.)
( + ) ( – )
D74 (L)
GroundNeutral/Unlock 5
Lock 0
6 (R)Neutral/Lock 5
Unlock 0
LIIA0566E

VEHICLE SECURITY (THEFT WARNING) SYSTEM
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Revision: August 20072004 QX56
2. CHECK DOOR KEY CYLINDER SWITCH LH GROUND HARNESS
Check continuity between front door lock assembly LH (key cylinder
switch) connector (A) D14 terminal 5 and body ground.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace harness.
3. CHECK DOOR KEY CYLINDER SWITCH LH
Check continuity between front door lock assembly LH (key cylinder
switch) terminals.
OK or NG
OK >> GO TO 4.
NG >> Replace front door lock assembly LH (key cylinder switch). Refer to BL-132, "
Removal and Instal-
lation" .
4. CHECK DOOR KEY CYLINDER HARNESS
Check continuity between main power window and door lock/unlock
switch connector (A) D7 terminals 4, 6 and front door lock assembly
LH (key cylinder switch) connector (B) D14 terminals 1, 6 and body
ground.
OK or NG
OK >> Replace main power window and door lock/unlock switch.
NG >> Repair or replace harness.
Connector Terminal (wire color) Continuity
D14 5 (B) – Ground Yes
WIIA0755E
Terminals Condition Continuity
1 – 5 Key is turned to UNLOCK or neutral. No
Key is turned to LOCK. Yes
5 – 6Key is turned to LOCK or neutral. No
Key is turned to UNLOCK. Yes
LIIA1573E
ConnectorTe r m i n a l s
(wire color)ConnectorTe r m i n a l s
(wire color)Continuity
A: Main
power win-
dow and
door lock/
unlock
switch4 (L) B: Front
door lock
assembly
LH (key
cylinder
switch)1 (L) Yes
6 (R) 6 R) Yes
4 (L),
6 (R)Ground No
WIIA0756E

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.

AUTOMATIC BACK DOOR SYSTEM
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Revision: August 20072004 QX56
Trouble Diagnosis ProcedureEIS002T0
1. Check the 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-115, "
Self-Diagnosis Procedures" .
5. Refer to diagnosis chart by symptom, repair or replace any malfunctioning parts. Refer to BL-116, "
Diag-
nosis Chart" .
6. Inspection End.
Self-Diagnosis ProceduresEIS005X4
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-118
Back door close switch (CLOSE) OFF → ONBL-120
Back door close switch (CANCEL) OFF → ONBL-121
Back door handle switch OFF → ONBL-127
Glass switch OFF → ONBL-36
A/T device (park switch) P position → other than P positionAT- 1 9 1
Vehicle speed* Vehicle speedAT-6 8
Remote keyless entry signal Keyfob switch OFF → ONBL-66
Door lock/unlock signal LOCK → UNLOCKBL-34
Pinch strip LH signal OFF → ONBL-122
Pinch strip RH signal OFF → ONBL-122

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

AUTOMATIC BACK DOOR SYSTEM
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Revision: August 20072004 QX56
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.
LIIA0801E

BL-118
AUTOMATIC BACK DOOR SYSTEM
Revision: August 20072004 QX56
Power Liftgate Switch System InspectionEIS002T3
1. POWER LIFTGATE SWITCH FUNCTION INSPECTION
Check power liftgate switch using switch operation.
OK or NG
OK >> Power liftgate switch is OK.
NG >> GO TO 2.
2. POWER LIFTGATE SWITCH POWER SUPPLY CIRCUIT INSPECTION
1. Turn ignition switch OFF.
2. While operating the power liftgate switch, check voltage
between back door control unit connector B55 terminal 23 and
ground.
OK or NG
OK >> Switch is OK.
NG >> GO TO 3.
3. POWER LIFTGATE SWITCH CIRCUIT INSPECTION
1. Disconnect power liftgate switch and back door control unit connector.
2. Check continuity between back door control unit connector (A)
B55 terminal 23 and power liftgate switch connector (B) M92 ter-
minal 1.
3. Check continuity between power liftgate switch connector (B)
M92 terminal 1 and ground.
OK or NG
OK >> GO TO 5.
NG >> Repair or replace harness.
4. POWER LIFTGATE SWITCH GROUND INSPECTION
Check continuity between power liftgate switch connector terminal 2
and ground.
OK or NG
OK >> Replace the power liftgate switch.
NG >> Repair or replace harness.
Connector terminal
(Wire color)
ConditionVoltage (V)
(Approx.)
( + ) ( - )
23 (L/W) GroundPower liftgate
switchON 0
OFF 5
LIIA0802E
1 (L/W) - 23 (L/W) : Continuity should exist.
1 (L/W) - ground : Continuity should not exist.
LIIA2254E
2 (B) - Ground : Continuity should exist.
LIIA1065E

BL-120
AUTOMATIC BACK DOOR SYSTEM
Revision: August 20072004 QX56
3. CHECK GLASS HATCH AJAR SWITCH
Check continuity between glass hatch ajar switch connector terminal
and ground.
OK or NG
OK >> Check glass hatch ajar switch case ground.
NG >> Replace glass hatch ajar switch.
Back Door Close (Close) Switch System InspectionEIS002T4
1. BACK DOOR CLOSE SWITCH FUNCTION INSPECTION
Check back door close (close) switch using switch operation.
OK or NG
OK >> Back door close switch is OK.
NG >> GO TO 2.
2. BACK DOOR CLOSE SWITCH SIGNAL INSPECTION
1. Turn ignition switch OFF.
2. While operating the back door close switch, check voltage
between back door control unit connector B55 terminal 8 and
ground.
OK or NG
OK >> Switch is OK.
NG >> GO TO 3.
3. BACK DOOR CLOSE SWITCH CIRCUIT INSPECTION
1. Disconnect back door close switch and back door control unit connector.
2. Check continuity between back door control unit connector (A)
B55 terminal 8 and back door close switch connector (B) B63
terminal 1.
3. Check continuity between back door close switch connector (B)
B63 terminal 1 and ground.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace harness.
Terminal Condition Continuity
Glass hatch ajar
switch + – GroundOpen Yes
Closed No
LIIA1151E
Connector terminal
(Wire color)Position of back door close
switchVoltage (V)
(Approx.)
( + ) ( - )
8 (GR/B) GroundMomentary
close positionON 0
OFF 5
LIIA0805E
1 (GR/B) - 8 (GR/B) : Continuity should exist.
1 (GR/B) - Ground : Continuity should not exist.
LIIA2255E