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.
- CHECK BACK DOOR CLOSURE MOTOR INPUT SIGNAL
- Turn ignition switch OFF.
- Disconnect back door lock assembly connector.
- Check voltage between back door lock assembly harness connector and ground.
(+)
(-)
Condition
Voltage
(Approx.)
Back door lock assembly
Connector
Terminal
D557
1
Ground
Back door
Open operation
Battery voltage
Other than above
0 V
2
Close operation
Battery voltage
Other than above
0 V
Is the inspection result normal?
YES
Replace back door lock assembly. Refer to Removal and Installation .
NO
GO TO 2.
- CHECK BACK DOOR CLOSURE MOTOR CIRCUIT
- Disconnect automatic back door control module connector.
- Check continuity between automatic back door control module harness connector and back door lock assembly harness connector.
Automatic back door control module
Back door lock assembly
Continuity
Connector
Terminal
Connector
Terminal
B56
31
D557
1
Yes
38
2
- Check continuity between automatic back door control module harness connector and ground.
Automatic back door control module
Ground
Continuity
Connector
Terminal
B56
31
No
38
Is the inspection result normal?
YES
Replace automatic back door control module. Refer to Removal and Installation .
NO
Repair or replace harness.