Nissan Sentra B18 (2020-2025) Service Manual: Its Can Communication Circuit

Diagnosis Procedure

1. CHECK CAN DIAGNOSIS

   Check the CAN diagnosis results from CONSULT to see that the chassis CAN communication 2 circuit has no malfunction.

   Is the chassis CAN communication 2 circuit normal?

   YES >>

   GO TO 2.

   NO >>

   Check and repair the chassis CAN communication 2 circuit.

2. CONNECTOR INSPECTION

   1. Turn the ignition switch OFF.

   2. Disconnect the battery cable from the negative terminal.

   3. Disconnect all the control unit connectors on ITS CAN communication circuit.

   4. Check terminals and connectors for damage, bend and loose connection.

   Is the inspection result normal?

   YES >>

   GO TO 3.

   NO >>

   Repair the terminal and connector.

3. CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

   Check the continuity between the front camera unit harness connector and distance sensor harness connector.

   Front camera unit harness connector		Distance sensor harness connector		Continuity
   Connector No.	Terminal No.	Connector No.	Terminal No.
   R9	5	E304	5	Existed
   	11		6	Existed

   Is the inspection result normal?

   YES >>

   GO TO 4.

   NO >>

   Check the harness and repair the root cause.

4. CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

   Check the continuity between the front camera unit harness connector terminals.

   Front camera unit harness connector			Continuity
   Connector No.	Terminal No.
   R9	5	11	Not existed

   Is the inspection result normal?

   YES >>

   GO TO 5.

   NO >>

   Check the harness and repair the root cause.

5. CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

   Check the continuity between the front camera unit harness connector and the ground.

   Front camera unit harness connector		Ground	Continuity
   Connector No.	Terminal No.
   R9	5		Not existed
   	11		Not existed

   Is the inspection result normal?

   YES >>

   GO TO 6.

   NO >>

   Check the harness and repair the root cause.

6. CHECK TERMINATION CIRCUIT

   1. Remove the front camera unit and the distance sensor.

   2. Check the resistance between the front camera unit terminals.

      Front camera unit		Resistance (Ω)
      Terminal No.
      5	11	Approx. 108 – 132

   3. Check the resistance between the distance sensor terminals.

      Distance sensor		Resistance (Ω)
      Terminal No.
      5	6	Approx. 108 – 132

   Is the measurement value within the specification?

   YES >>

   GO TO 7.

   NO >>

   Replace the front camera unit and/or distance sensor.

7. CHECK SYMPTOM

   Connect all the connectors. Check if the symptoms described in the “Symptom (Results from interview with customer)” are reproduced.

   Inspection result

   Reproduced>>

   GO TO 8.

   Non-reproduced >>

   Start the diagnosis again. Follow the trouble diagnosis procedure when past error is detected.

8. CHECK CONTROL UNIT REPRODUCTION

   Perform the reproduction test as per the following procedure for each control unit.

   1. Turn the ignition switch OFF.

   2. Disconnect the battery cable from the negative terminal.

   3. Disconnect one of the control unit connectors of ITS CAN communication circuit.

      Note:

      Front camera unit and distance sensor have a termination circuit. check other units first.

   4. Connect the battery cable to the negative terminal. Check if the symptoms described in the “Symptom (Results from interview with customer)” are reproduced.

      Note:

      Although control unit-related error symptoms occur, do not confuse them with other symptoms.

   Inspection result

   Reproduced>>

   Connect the connector. Check other control units as per the above procedure.

   Non-reproduced >>

   Replace the control unit whose connector was disconnected.

© 2014-2026 Copyright www.nisentra.com