Diagnosis Procedure

WARNING: This page is about a different car, the 2020 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

CALIBRATION OF AUTOMATIC BACK DOOR POSITION INFORMATION
1. Perform initialization setting of automatic back door position information.
  Refer to Work Procedure .
2. Erase DTC, and then repeat "PERFORM DTC CONFIRMATION PROCEDURE".
Is DTC detected?

YES

GO TO 2.

NO

Inspection End.
CHECK INSTALLATION OF BACK DOOR ASSEMBLY
1. Check that back door assembly is installed normally.
  Refer to Adjustment .
2. Check back door assembly mechanism deformation, looseness, rattle, interference with other parts, and pinched foreign materials.
Is the inspection result normal?

YES

GO TO 3.

NO

Repair or replace the malfunctioning parts.

CHECK ENCODER SIGNAL

Select "AUTOMATIC BACK DOOR CONTROL MODULE" using CONSULT.
Select "SPINDLE LH ENCODER A" and "SPINDLE LH ENCODER B" in "DATA MONITOR" mode.

Check that the function operates normally according to the following conditions.

Monitor item	Condition		Status
SPINDLE LH ENCODER A	Back door	Moving (auto or manual)	HI <=> LO
SPINDLE LH ENCODER A		When stopped	HI or LO
SPINDLE LH ENCODER B		Moving (auto or manual)	HI <=> LO
SPINDLE LH ENCODER B		When stopped	HI or LO

Is the inspection result normal?

YES

Replace automatic back door control module. Refer to Removal and Installation .

GO TO 4.

CHECK ENCODER POWER SUPPLY

Turn ignition switch OFF.
Disconnect spindle unit LH connector.
Turn ignition switch ON.

Check voltage between spindle unit LH harness connector and ground.

(+)		(-)	Voltage (Approx.)
Spindle unit LH
Connector	Terminal
B70	8	Ground	Battery voltage

Is the inspection result normal?

YES

GO TO 6.

GO TO 5.

CHECK ENCODER POWER SUPPLY CIRCUIT

Turn ignition switch OFF.
Disconnect automatic back door control module connector.

Check continuity between automatic back door control module harness connector and spindle unit LH harness connector.

Automatic back door control module		Spindle unit LH		Continuity
Connector	Terminal	Connector	Terminal	Continuity
B55	19	B70	8	Yes

Check continuity between automatic back door control module harness connector and ground.

Automatic back door control module		Ground	Continuity
Connector	Terminal
B55	19		No

Is the inspection result normal?

YES

Replace automatic back door control module. Refer to Removal and Installation .

Repair or replace harness.

CHECK ENCODER SIGNAL CIRCUITS

Turn ignition switch OFF.
Disconnect automatic back door control module connector.

Check continuity between automatic back door control module harness connector and spindle unit LH harness connector.

Automatic back door control module		Spindle unit LH		Continuity
Connector	Terminal	Connector	Terminal
B55	6	B70	3	Yes
	7		10

Check continuity between automatic back door control module harness connector and ground.

Automatic back door control module		Ground	Continuity
Connector	Terminal
B55	6		No
	7

Is the inspection result normal?

YES

GO TO 7.

Repair or replace harness.

CHECK ENCODER GROUND CIRCUIT

Connect automatic back door control module and spindle unit LH connector.

Check continuity between automatic back door control module harness connector and ground.

Automatic back door control module

Ground

Voltage

(Approx.)

Connector

Terminal

B55

0 V

Is the inspection result normal?

YES

Replace spindle unit LH. Refer to Removal and Installation .

Repair or replace harness.