2007 INFINITI QX56 service

AUTOMATIC BACK DOOR SYSTEM
BL-93
< SERVICE INFORMATION >
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Self-Diagnosis ProcedureINFOID:0000000003532964
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.
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.
Switch signal Operation Refer to
Power liftgate switch OFF → ONBL-95
Back door close switch (CLOSE) OFF → ONBL-98
Back door close switch (CANCEL) OFF → ONBL-99
Back door handle switch OFF → ONBL-104
Glass switch OFF → ONBL-95
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-37
Door lock/unlock signal LOCK → UNLOCKBL-15
Pinch strip LH signal OFF → ONBL-100
Pinch strip RH signal OFF → ONBL-100

BL-94
< SERVICE INFORMATION >
AUTOMATIC BACK DOOR SYSTEM
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 ChartINFOID:0000000003532965
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-114
3. Back door clutch diagnosis result Back door clutch does not operateBL-114
4. Back door motor diagnosis resultBack door motor does not operate (no operat-
ing current)BL-114
5. Cinch latch motor diagnosis resultCinch latch motor does not operate (no operat-
ing current)BL-114
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-95
Park switch —
Power window serial linkBL-92
Pinch strip system inspectionBL-100
Automatic operations are not carried out together with open/close
operations.
(Manual operations are normal.)Power liftgate switch system inspectionBL-95Back door close switch system inspectionBL-98
Auto back door power supply and ground cir-
cuit system inspection.BL-95
The auto closure function does not operate.
(Stops at the halfway position for auto closing operations.)Pinch strip system inspectionBL-100
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 re-
verse if the back door handle is operated.Handle switch systemBL-104

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
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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

BL-98
< SERVICE INFORMATION >
AUTOMATIC BACK DOOR SYSTEM
OK or NG
OK >> Check glass hatch ajar switch case ground condition.
NG >> Replace glass hatch ajar switch, or repair or replace
harness.
Back Door Close (Close) Switch System InspectionINFOID:0000000003532968
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 >> Back door close 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 close switch connector B63
terminal 1 and back door control unit connector B55 terminal 8.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace harness.
4.BACK DOOR CLOSE SWITCH GROUND INSPECTION
Terminals Condition Continuity
Glass hatch ajar
switch + – GroundOpen Yes
Closed No
LIIA1151E
Te r m i n a l s
ConditionVoltage (V)
(Approx.)
(+) (-)
8GroundBack door
close switchON 0
OFF 5
LIIA0805E
1 - 8 : Continuity should exist.
LIIA1066E

AUTOMATIC BACK DOOR SYSTEM
BL-99
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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-100
< SERVICE INFORMATION >
AUTOMATIC BACK DOOR SYSTEM
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.
Pinch Strip System InspectionINFOID:0000000003532970
1.PINCH STRIP SIGNAL INSPECTION
1. Turn ignition switch OFF.
2. While operating the pinch strip, check voltage between back
door control unit connector B55 terminals 19, 20 and ground.
OK or NG
OK >> Pinch strip switch is OK.
NG >> GO TO 2.
2.PINCH STRIP CIRCUIT INSPECTION
1. Disconnect pinch strip and back door control unit.
2. Check continuity between pinch strip connector D715 (RH),
D517 (LH) terminal 1, 2 and back door control unit connector
B55 terminal 5, 19 (RH), 20 (LH).
OK or NG
OK >> GO TO 3.
NG >> Repair the harness between the pinch strip and the back
door control unit.
3.PINCH STRIP GROUND INSPECTION
1. Connect back door control unit connector.
2. Check continuity between pinch strip connector terminal 2 and
ground.
OK or NG
OK >> Replace the pinch strip.
NG >> Repair or replace harness.3 - Ground : Continuity should exist.
WIIA0602E
Te r m i n a l s
ConditionVoltage (V)
(Approx.)
(+) (-)
19
20GroundPinch strip operation 0
Other 4
LIIA0811E
1 - 19 : Continuity should exist.
1 - 20 : Continuity should exist.
2 - 5 : Continuity should exist.
LIIA0815E
2 - Ground : Continuity should exist.
LIIA0817E