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Home >> Hyundai >> 2021 >> Ioniq Hybrid SEL >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System Diagnosis (HEV) (2 Of 2) >> DTC B1493-00: Occupant Classification System (OCS) Communication Error >> Wiring Inspection >> CAN communication Line Inspection

CAN communication Line Inspection

  1. Ignition switch "OFF".
  2. Connect SRSCM and Occupant Classification System (OCS) ECU connector.
  3. Ignition switch ON.
  4. Measure signal waveform between CAN HIGH terminal of Occupant Classification System (OCS) ECU and chassis ground.
  5. Measure signal waveform between CAN LOW terminal of Occupant Classification System (OCS) ECU and chassis ground.

    Specification  : Refer to SIGNAL WAVEFORM AND DATA 

  6. Is the measured signal waveform normal?

    YES 

    • Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
    • Repair or replace as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

    NO 

    • Check a circuit open and short of the CAN communication line, and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
    • Substitute a known-good Occupant Classification System (OCS) ECU and check for proper operation. If the problem is corrected, replace Occupant Classification System (OCS) ECU and then go to "VERIFICATION OF VEHICLE REPAIR " procedure and Go to "BODY SENSOR RESET " procedure.
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