Nissan Sentra B18 (2020-2025) Service Manual / Body Exterior, Doors, Roof & Vehicle Security / Power Window Control System :: Dtc/circuit Diagnosis / U1c02-08 Lin Door

Nissan Sentra B18 (2020-2025) Service Manual: U1c02-08 Lin Door

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
U1C02-08	LIN DOOR (Local interconnect network communication)	Diagnosis condition	Ignition switch ON
		Signal (terminal)	LIN communication signal
		Threshold	BCM detects communication error with front power window motor LH
		Diagnosis delay time	1 second or less

POSSIBLE CAUSE

LIN communication line
Front power window motor LH

FAIL SAFE

Front power window motor LH operation is stop.

Confirmation Procedure

PERFORM DTC CONFIRMATION PROCEDURE
1. CONSULT
  1. Ignition switch ON.
  2. Select “Self Diagnostic Result” mode of “BCM”.
  3. Check DTC.
Is DTC detected?
YES >>
Refer to DTC Diagnosis Procedure.
NO >>
To check malfunction symptom before repair: Refer to Intermittent Incident.
NO >>
Confirmation after repair: Inspection End.

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

CHECK FRONT POWER WINDOW MOTOR LH POWER SUPPLY AND GROUND CIRCUIT
1. Check front power window motor LH power supply and ground circuit.
  
  Refer to Diagnosis Procedure.
Is the inspection result normal?
YES >>
GO TO 2.
NO >>
Repair or replace harness.

CHECK LIN COMMUNICATION SIGNAL

Ignition switch OFF, and then wait for 3 minutes with front LH door open.
Note:
- Even after ignition switch OFF, power is supplied to accessories for a certain amount of time by the AUTO ACC function.
- When Nissan Sentra vehicle is operated while on standby, power may be supplied to accessories.
Disconnect front power window motor LH connector.
Ignition switch ON.

Check signal between front power window motor LH harness connector and ground using an oscilloscope.

(+)	(−)	Signal (Reference value)
D8	6	Ground

(+)

(−)

Signal

(Reference value)

Front power window motor LH

Connector

Terminal

Ground

Is the inspection result normal?

YES >>

Replace front power window motor LH. Refer to Removal and Installation.

NO >>

GO TO 3.

CHECK LIN COMMUNICATION CIRCUIT

Ignition switch OFF.
Disconnect BCM connector.

Check continuity between BCM harness connector and front power window motor LH harness connector.

BCM		Front power window motor LH		Continuity
Connector	Terminal	Connector	Terminal	Continuity
M84	24	D8	6	Yes

Check continuity between BCM harness connector and ground.

BCM		—		Continuity
Connector	Terminal	—		Continuity
M84	24	Ground		No

Is the inspection result normal?

YES >>

Check intermittent incident. Refer to Intermittent Incident.

NO >>

Repair or replace harness.

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