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Home >> Infiniti >> 2015 >> Q50 Base, RWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> LAN System (Can) (Exc Hybrid) >> DTC/Circuit Diagnosis >> DLC Branch Line Circuit (Can Communication Circuit 2) >> Diagnosis Procedure

Diagnosis Procedure

  1. 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 (connector side and harness side).

    Is the inspection result normal?

    YES 

    GO TO STEP 2  .

    NO 

    Repair the terminal and connector branch line.

  2. CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

    1. Disconnect the connector of CAN gateway.
    2. Check the continuity between the CAN gateway harness connector terminals.
      CAN gateway harness connector Continuity
      Connector No. Terminal No.
      M24 4 6 Existed
      10 12 Existed

    Is the inspection result normal?

    YES 

    GO TO STEP 3  .

    NO 

    Check the harness and repair the root cause (CAN communication circuit 2).

  3. CHECK HARNESS FOR OPEN CIRCUIT

    1. Connect the connector of CAN gateway.
    2. Check the resistance between the data link connector terminals.
    Data link connector Resistance (Ω)
    Connector No. Terminal No.
    M25 13 12 Approx. 54 - 66

    Is the measurement value within the specification?

    YES (Present error) 

    Check CAN system type decision again.

    YES (Past error) 

    Error was detected in the data link connector branch line circuit (CAN communication circuit 2 side).

    NO 

    Repair the data link connector branch line.

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