Infiniti QX56 (JA60). Manual - part 238

AUTOMATIC BACK DOOR SELF-DIAGNOSIS PROCEDURE

DLK-123

< COMPONENT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

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AUTOMATIC BACK DOOR SELF-DIAGNOSIS PROCEDURE

Self-Diagnosis Procedure

INFOID:0000000005146997

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 sliding 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 second 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 second.
8. Release the back door handle switch.

Switch signal

Operation

Refer to

Power liftgate switch

OFF 

→ ON

DLK-129

Back door close switch (CLOSE)

OFF 

→ ON

DLK-131

Back door close switch (CANCEL)

OFF 

→ ON

DLK-133

Back door handle switch

OFF 

→ ON

DLK-140

A/T shift selector (park position switch)

P position 

→ other than P position

DLK-101

Vehicle speed*

Vehicle speed

TM-50

Remote keyless entry signal

Keyfob switch OFF 

→ ON

DLK-103

Door lock/unlock signal

LOCK 

→ UNLOCK

DLK-74

Pinch strip LH signal

OFF 

→ ON

DLK-135

Pinch strip RH signal

OFF 

→ ON

DLK-135

DLK-124

< COMPONENT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

AUTOMATIC BACK DOOR SELF-DIAGNOSIS PROCEDURE

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 the operating check mode.
Self-diagnosis results are indicated by the back door warning chime.

Turn ignition switch OFF to end input signal check mode.

Back door warning chime order

Back door warning chime length

Start self-diagnosis

1.5 seconds

OK

NG

1. Operating conditions diagnosis

0.5 second

0.2 second

2. Back door encoder diagnosis

0.5 second

0.2 second

3. Back door clutch diagnosis

0.5 second

0.2 second

4. Back door motor diagnosis

0.5 second

0.2 second

5. Cinch latch motor diagnosis

0.5 second

0.2 second

Restart self-diagnosis

1.5 seconds

Item

NG Result

Refer to

1. Operating conditions diagnosis result

One 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 result

Sensor diagnosis/short, pulse signal, pulse 
signal direction

DLK-247

3. Back door clutch diagnosis result

Back door clutch does not operate

DLK-247

4. Back door motor diagnosis result

Back door motor does not operate (no operat-
ing current)

DLK-247

5. Cinch latch motor diagnosis result

Cinch latch motor does not operate (no operat-
ing current)

DLK-247

POWER LIFTGATE SWITCH FUNCTION

DLK-125

< COMPONENT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

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POWER LIFTGATE SWITCH FUNCTION

Diagnosis Procedure

INFOID:0000000005146998

Regarding Wiring Diagram information, refer to 

DLK-199, "Wiring Diagram—AUTOMATIC BACK DOOR SYS-

TEM—"

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1.

POWER LIFTGATE SWITCH FUNCTION INSPECTION

Check power liftgate switch using switch operation.
Did the back door respond correctly?

YES

>> Power liftgate switch is OK.

NO

>> GO TO 2

2.

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.

Is the inspection result normal?

YES

>> Switch is OK.

NO

>> GO TO 3

3.

POWER LIFTGATE SWITCH CIRCUIT INSPECTION

1. Disconnect back door control unit and power liftgate switch connectors.

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 back door control unit connector (A)

B55 terminal 23 and ground.

Is the inspection result normal?

YES

>> GO TO 4

NO

>> Repair the harness between the power liftgate switch and the back door control unit.

4.

POWER LIFTGATE SWITCH GROUND INSPECTION

Terminal

Measuring condition

Voltage (V)

(Approx.)

(+)

(-)

23

Ground

Power liftgate 

switch

ON

0

OFF

Battery voltage

LIIA0802E

23 - 1

: Continuity should exist.

23 - Ground

: Continuity should not exist.

ALKIA0670ZZ

DLK-126

< COMPONENT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

POWER LIFTGATE SWITCH FUNCTION

Check continuity between power liftgate switch connector terminal 2

and ground.

Is the inspection result normal?

YES

>> GO TO 5

NO

>> Repair the harness between the power liftgate switch

and ground.

5.

POWER LIFTGATE SWITCH POWER SUPPLY CIRCUIT INSPECTION

1. Reconnect back door control unit.

2. Ensure liftgate is closed.

3. Check voltage between power liftgate switch connector M92 ter-

minal 1 and ground.

Is the inspection result normal?

YES

>> Replace the power liftgate switch.

NO

>> Replace the back door control unit.

2 - Ground

: Continuity should exist.

LIIA1065E

1 - Ground

:Approx. battery voltage

LIIA1063E