Nissan Sentra B18 (2020-2025) Service Manual: Sonar Branch Line Circuit

Nissan Sentra B18 (2020-2025) Service Manual / Electrical & Power Control / Lan System :: Can / Dtc/circuit Diagnosis / Sonar Branch Line Circuit

Diagnosis Procedure

Diagnosis Procedure

CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the following terminals and connectors for damage, bend and loose connection (unit side and connector side).
  - Sonar control unit
  - 8CH CAN gateway
Is the inspection result normal?
YES >>
GO TO 2.
NO >>
Repair the terminal and connector.

CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

Disconnect the connector of 8CH CAN gateway.

Check the resistance between the 8CH CAN gateway harness connector terminals.

8CH CAN gateway harness connector			Continuity
Connector No.	Terminal No.
M37	5	25	Existed
	6	26	Existed

Is the measurement value within the specification?

YES >>

GO TO 3.

NO >>

Repair the harness and repair the root cause (Nissan Sentra Vehicle CAN communication 2 circuit side).

CHECK HARNESS FOR OPEN CIRCUIT

Connect the connector of 8CH CAN gateway.
Disconnect the connector of sonar control unit.

Check the resistance between the sonar control unit harness connector terminals.

Sonar control unit harness connector			Resistance (Ω)
Connector No.	Terminal No.
B87	5	6	Approx. 54 – 66

Is the measurement value within the specification?

YES >>

GO TO 4.

NO >>

Repair the sonar control unit branch line.

CHECK POWER SUPPLY AND GROUND CIRCUIT

Check the power supply and the ground circuit of the sonar control unit. Refer to Diagnosis Procedure.

Is the inspection result normal?
YES (Present error) >>
Replace the sonar control unit. Refer to Removal and Installation.
YES (Past error) >>
Error was detected in the sonar control unit branch line.
NO >>
Repair the power supply and the ground circuit.

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