2007 INFINITI QX56 battery

AUTOMATIC BACK DOOR SYSTEM
BL-83
< SERVICE INFORMATION >
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P Reversal
The door will reverse direction during power open or close operation if the automatic door main switch, keyfob
or back door close switch is operated. A chime will sound to announce the reversal.
Anti-Pinch Function
• During auto operation, if an object is detected in the door's path, a warning chime sounds and the back door
operates in the reverse direction to prevent pinching.
• During auto close operation, if an object is detected by the pinch strips in the door's path, a warning chime
sounds and the back door operates in the open direction until it is fully open.
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 malfunction of the gas stays is detected, the back door control unit will close the back door while sound-
ing the warning chime. The back door cannot be opened using the switches until the gas stay malfunction is
repaired.
Warning Functions
• The hazard warning lamps flash and a warning chime is sounded according to the back door operating state,
operations, and conditions.
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 le-
ver in P or N
range and vehi-
cle speed less
than 2 km/h or
ignition switch
in OFF position—A/T selector le-
ver in P or N
range and vehi-
cle speed less
than 2 km/h or
ignition switch
in OFF position—A/T selector le-
ver 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 op-
eration 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 manu-
al mode.

AUTOMATIC BACK DOOR SYSTEM
BL-91
< SERVICE INFORMATION >
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P
Back Door Control Unit Harness Connector Terminal LayoutINFOID:0000000003532960
Terminal and Reference Value for Back Door Control UnitINFOID:0000000003532961
LIIA2444E
Te r m i n a l Wire Col-
orItem 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 hazards50ms > Pulse must be > 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 Y Cinch latch motor CLOSE output Back door close operation Battery voltage
12 L Closure motor RETURN output Back door release operation Battery voltage
13 P/L Back door close switchCANCEL position 0
NEUTRAL position 5
14 P Close switch signal While fully opening back door
PIIA3278E
WIIA1047E

BL-92
< SERVICE INFORMATION >
AUTOMATIC BACK DOOR SYSTEM
Terminal and Reference Value for BCM
INFOID:0000000003532962
Refer to BCS-11, "Terminal and Reference Value for BCM".
Trouble Diagnosis ProcedureINFOID:0000000003532963
1. Check the trouble symptom and customer's requests.
2. Understand outline of system. Refer to BL-80, "
System Description".
3. Confirm system operation.
4. Perform self-diagnosis procedures. Refer to BL-93, "
Self-Diagnosis Procedure".
5. Refer to diagnosis chart by symptom, repair or replace any malfunctioning parts. Refer to BL-94, "
Diagno-
sis Chart".
6. Inspection End.
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 5
20 V/G Pinch strip LHDetecting obstruction 0
Other 5
21 W/V Power window serial link —
22 BR Half switch signal Back door half latch position
23 L/W Power liftgate switchON 0
OFF 5
26 V Back door handle switch signalHandle operation 0
Other Battery voltage Te r m i n a l Wire Col-
orItem ConditionVoltage (V)
(Approx.)
WIIA1047E
PIIA2344E
PIIA2169E

AUTOMATIC BACK DOOR SYSTEM
BL-95
< SERVICE INFORMATION >
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Back Door Power Supply and Ground Circuit InspectionINFOID:0000000003532966
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.
Power Liftgate Switch System InspectionINFOID:0000000003532967
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.
When the keyfob is operated, the back door does not operate au-
tomatically.Remote keyless entry system inspectionBL-37Power window serial linkBL-92
Pinch strip system inspectionBL-100
Auto closure does not operate.Half-latch switch systemBL-101Cinch latch motor systemBL-105
Handle switch systemBL-104
The back door does not open.
(Closure motor rotation is not reversed.)Open switch systemBL-102
Handle switch systemBL-104
Warning chime does not sound. Back door warning chime systemBL-101
Auto closure operation works, but the back door is not fully closedClose switch systemBL-103
Handle switch systemBL-104
Cinch latch motor systemBL-105
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-96
< SERVICE INFORMATION >
AUTOMATIC BACK DOOR SYSTEM
2.POWER LIFTGATE SWITCH POWER SUPPLY CIRCUIT INSPECTION
1. Turn ignition switch OFF.
2. Check voltage between power liftgate switch connector M92 ter-
minal 1 and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace harness.
3.POWER LIFTGATE SWITCH SIGNAL 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 4.
4.POWER LIFTGATE SWITCH CIRCUIT INSPECTION
1. Disconnect power liftgate switch and back door control unit connector.
2. Check continuity between power liftgate switch connector M92
terminal 1 and back door control unit connector B55 terminal 23.
OK or NG
OK >> GO TO 5.
NG >> Repair or replace harness.
5.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.
GLASS HATCH AJAR SWITCH CHECK
1 - Ground :Approx. battery voltage
LIIA1551E
Te r m i n a l s
ConditionVoltage (V)
(Approx.)
(+) (-)
23 GroundPower liftgate
switchON 0
OFF 5
LIIA0802E
1 - 23 : Continuity should exist.
LIIA1064E
2 - Ground : Continuity should exist.
LIIA1065E

AUTOMATIC BACK DOOR SYSTEM
BL-97
< SERVICE INFORMATION >
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1.CHECK GLASS HATCH AJAR SWITCH INPUT SIGNAL
With CONSULT-II
Check glass hatch ajar switch ("TRNK OPN MNTR") in DATA MONITOR mode with CONSULT–II. Refer to
BL-24, "
CONSULT-II Function (BCM)".
• When glass hatch is open:
• When glass hatch is closed:
Without CONSULT-II
Check voltage between BCM connector M19 terminal 42 and ground.
OK or NG
OK >> System is OK.
NG >> GO TO 2.
2.CHECK GLASS HATCH AJAR SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect glass hatch ajar switch, BCM and back door control unit.
3. Check continuity between glass hatch ajar switch connector D707 terminal + and BCM connector M19 ter-
minal 42.
4. Check continuity between glass hatch ajar switch connector
D707 terminal + and back door control unit connector B55 termi-
nal 17.
5. Check continuity between glass hatch ajar switch connector
D707 terminal + and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace harness.
3.CHECK GLASS HATCH AJAR SWITCH
1. Disconnect glass hatch ajar switch connector.
2. Check continuity between glass hatch ajar switch connector terminal and ground.TRNK OPN MNTR : ON
TRNK OPN MNTR : OFF
WIIA0108E
Connector ItemTe r m i n a l s
ConditionVoltage (V)
(Approx.)
(+) (–)
M19 BCM 42 GroundOpen
↓
Closed0
↓
Battery voltage
LIIA1149E
+ - 42 : Continuity should exist
+ - 17 : Continuity should exist
+ - Ground : Continuity should not exist
LIIA1547E

AUTOMATIC BACK DOOR SYSTEM
BL-99
< SERVICE INFORMATION >
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P
Check continuity between back door close switch connector B63 ter-
minal 3 and ground.
OK or NG
OK >> Replace the back door close switch.
NG >> Repair or replace harness.
Back Door Close (Cancel) Switch System InspectionINFOID:0000000003532969
1.BACK DOOR CLOSE SWITCH FUNCTION INSPECTION
Check back door close (cancel) switch using switch operation.
OK or NG
OK >> Back door close switch is OK.
NG >> GO TO 2.
2.BACK DOOR CLOSE (CANCEL) SWITCH SIGNAL INSPECTION
1. Turn ignition switch OFF.
2. While operating the back door close (cancel) switch, check volt-
age between back door control unit connector B55 terminal 13
and ground.
OK or NG
OK >> Back door close switch is OK.
NG >> GO TO 3.
3.BACK DOOR CLOSE (CANCEL) SWITCH CIRCUIT INSPECTION
1. Disconnect back door close switch and back door control unit connector.
2. Check continuity between back door close switch connector B63
terminal 5 and back door control unit connector B55 terminal 13.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace harness.
4.BACK DOOR CLOSE SWITCH GROUND INSPECTION3 - Ground : Continuity should exist.
WIIA0602E
Te r m i n a l s
ConditionVoltage (V)
(Approx.)
(+) (-)
13 GroundBack door
close switchON 0
OFF Battery voltage
LIIA1068E
5 - 13 : Continuity should exist.
LIIA1069E

BL-104
< SERVICE INFORMATION >
AUTOMATIC BACK DOOR SYSTEM
Check continuity between back door latch (close switch) connector
D503 terminal 8 and ground.
OK or NG
OK >> Replace the back door latch.
NG >> Repair or replace harness.
Back Door Handle Switch System InspectionINFOID:0000000003532975
1.BACK DOOR HANDLE SWITCH SIGNAL INSPECTION
1. Turn ignition switch OFF.
2. While operating the back door handle switch, check voltage
between back door control unit connector B55 terminal 26 and
ground.
OK or NG
OK >> Back door handle switch is OK.
NG >> GO TO 2.
2.BACK DOOR HANDLE SWITCH CIRCUIT INSPECTION
1. Disconnect back door handle switch and back door control unit.
2. Check continuity between back door handle switch connector
D706 terminal 3 and back door control unit connector B55 termi-
nal 26.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace harness.
3.BACK DOOR HANDLE SWITCH GROUND INSPECTION
Check continuity between back door handle switch connector D706
terminal 4 and ground.
OK or NG
OK >> Replace the back door handle switch.
NG >> Repair or replace harness.8 - Ground : Continuity should exist.
LIIA0828E
Te r m i n a l s
ConditionVoltage (V)
(Approx.)
(+) (-)
26 GroundBack door handle switch (ON) 0
Other (OFF) Battery voltage
LIIA0833E
3 - 26 : Continuity should exist.
WIIA0604E
4 - Ground : Continuity should exist.
WIIA0605E