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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 >> 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).
      • Data link connector
      • Harness connector M133 and fuse block (J/B) side connector

    Is the inspection result normal?

    YES 

    GO TO STEP 2  .

    NO 

    Repair the terminal and connector.

  2. CHECK HARNESS FOR OPEN CIRCUIT

    Check the resistance between the data link connector terminals.

    Data link connector Resistance (Ω)
    Connector No. Terminal No.
    M25 6 14 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.

    NO 

    GO TO STEP 3  .

  3. CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

    1. Disconnect the harness connector M133.
    2. Check the continuity between the data link connector and the harness connector.
      Data link connector Harness connector Continuity
      Connector No. Terminal No. Connector No. Terminal No.
      M25 6 M133 23C Existed
      14 5C Existed

    Is the inspection result normal?

    YES 

    Replace the fuse block (J/B).

    NO 

    Repair the harness between the data link connector M25 and the harness connector M133.

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