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Home >> Infiniti >> 2017 >> QX70 RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 183 (LAN System (Can) (Wiring Diagrams And Circuit Diagnosis) (Hybrid)) >> Circuit Diagnosis >> HV Bat Branch Line Circuit >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2016 Infiniti Q50. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:

ELECTRIC_SHOCK Since hybrid vehicles and electric vehicles contain a high voltage battery, there is the risk of electric shock, electric leakage, or similar accidents if the high voltage component and vehicle are handled incorrectly. Be sure to follow the correct work procedures when performing inspection and maintenance.

WARNING:
  • Be sure to remove the service plug in order to disconnect the high voltage circuits before performing inspection or maintenance of high voltage system harnesses and parts.
  • The removed service plug must always be carried in a pocket of the responsible worker or placed in the tool box during the procedure to prevent the plug from being connected by mistake.
  • Be sure to wear insulating protective equipment before beginning work on the high voltage system.
  • Never allow workers other than the responsible person to touch the vehicle containing high voltage parts. To keep others from touching the high voltage parts, these parts must be covered with an insulating sheet except when using them.
  • Refer to HIGH VOLTAGE PRECAUTIONS .
CAUTION:

Never bring the vehicle into the READY status with the service plug removed unless otherwise instructed in the Service Information. A malfunction may occur if this is not observed.

  1. CHECK CONNECTOR

    1. Turn the ignition switch OFF.
    2. Disconnect the 12V battery cable from the negative terminal.
    3. Check the terminals and connectors of the Li - ion battery for damage, bend and loose connection (unit side and connector side).

    Is the inspection result normal?

    YES 

    GO TO STEP 2  .

    NO 

    Repair the terminal and connector.

  2. CHECK HARNESS FOR OPEN CIRCUIT

    1. Disconnect the connector of Li - ion battery.
    2. Check the resistance between the Li - ion battery harness connector terminals.
      Li - ion battery controller harness connector Resistance (Ω)
      Connector No. Terminal No.
      T28 3 15 Approx. 108 - 132

    Is the measurement value within the specification?

    YES 

    GO TO STEP 3  .

    NO 

    Replace the tail harness.

  3. PRECONDITIONING

    WARNING:

    Follow the instructions below before starting the procedure.

    1. Disconnect high voltage circuit. Refer to HOW TO DISCONNECT HIGH VOLTAGE .
    2. Check voltage in high voltage circuit. Refer to CHECK VOLTAGE IN HIGH VOLTAGE CIRCUIT .

    GO TO STEP 4  .

  4. CHECK POWER SUPPLY AND GROUND CIRCUIT

    Check the power supply and the ground circuit of the Li - ion battery controller. Refer to DIAGNOSIS PROCEDURE .

    Is the inspection result normal?

    YES 

    GO TO STEP 5  .

    NO 

    Repair the power supply and the ground circuit.

  5. CHECK HARNESS FOR OPEN CIRCUIT

    1. Remove Li-ion battery controller. Refer to DISASSEMBLY AND ASSEMBLY .
    2. Check the continuity between vehicle communication harness (harness between Li-ion battery harness connector side and Li-ion battery controller side) connector terminals. Refer to CIRCUIT DIAGRAM .
      Vehicle communication harness Continuity
      Li-ion battery harness connector side (LB39) Li-ion battery controller side (LB1)
      Terminal No. Terminal No.
      3 1 Existed
      15 13 Existed

    Is the measurement value within the specification?

    YES (Present error) 

    Replace the Li-ion battery controller. Refer to DISASSEMBLY AND ASSEMBLY .

    YES (Past error) 

    Error was detected in the Li-ion battery controller branch line.

    NO 

    Repair the vehicle communication harness.

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