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Home >> Infiniti >> 2021 >> QX50 Essential, 4WD >> Repair and Diagnosis (Single Page) >> Restraints >> Restraints Control Systems >> SRS Airbag Control System (DTC/Circuit Diagnosis) >> DTC/Circuit Diagnosis >> DTC B00A0: Occupant Classification System Control Unit >> Diagnosis Procedure (B00A0-93)
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Diagnosis Procedure (B00A0-93)

  1. PERFORM ZERO POINT RESET 

    SYMBOL CONSULT

    1. Perform zero point reset. Refer to Description .
    2. Ignition switch ON.
    3. Check for DTC.

    Is DTC still current?

    YES

    GO TO 2.

    NO

    Clear DTC. Inspection End.

  2. HARNESS CONNECTOR 

    Visually inspect all applicable harness connectors for the following:

    • Visible damage to connector or terminal
    • Loose terminal
    • Poor connection
      NOTE: All harness connectors should be inspected from the air bag diagnosis unit to the end component (including any in-line connectors)

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    Perform the following repairs. Then, GO TO 3.

    • Visible damage: Replace the harness.
    • Loose terminal: Secure the terminal.
    • Poor connection: Secure the connection.
  3. CONFIRM DTC 

    SYMBOL CONSULT

    1. Reconnect all harness connectors.
    2. Ignition switch ON.
    3. Check for DTC.

    Is DTC still current?

    YES

    GO TO 4.

    NO

    Clear DTC and perform zero point reset. Refer to Description .

  4. REPLACE OCS CONTROL UNIT 

    SYMBOL CONSULT

    1. Replace the OCS control unit. Refer to Removal and Installation .
    2. Ignition switch ON.
    3. Check for DTC.

    Is DTC still current?

    YES

    GO TO 5.

    NO

    Clear DTC and perform zero point reset. Refer to Description .

  5. AIR BAG DIAGNOSIS SENSOR UNIT 

    SYMBOL CONSULT

    1. Replace the air bag diagnosis sensor unit. Refer to Removal and Installation .
    2. Ignition switch ON.
    3. Check for DTC.

    Is DTC still current?

    YES

    GO TO 6.

    NO

    Clear DTC and perform zero point reset. Refer to Description .

  6. RELATED HARNESS 

    SYMBOL CONSULT

    1. Replace the related harnesses (OCS sensors to OCS control unit, OCS control unit to seat, seat to main harness, main harness to air bag diagnosis sensor unit)
    2. Ignition switch ON.
    3. Check for DTC.

    Is DTC still current?

    YES

    GO TO 7.

    NO

    Clear DTC and perform zero point reset. Refer to Description .

  7. REPLACE OCS SENSORS 

    SYMBOL CONSULT

    1. Replace the OCS sensors. Refer to Removal and Installation .
    2. Ignition switch ON.
    3. Check for DTC.

    Is DTC still current?

    YES

    GO TO 8.

    NO

    Clear DTC and perform zero point reset. Refer to Description .

  8. REPLACE PASSENGER SEAT CUSHION FRAME 
    1. Replace the passenger seat cushion frame. Refer to Seat Cushion .
    2. Clear DTC and perform zero point reset. Refer to Description .

    Inspection End.

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