CAN Communication Circuit Inspection

■ CAN Communication Line Inspection 

1. IG KEY OFF.
2. Disconnect MCU connector and BMS connector.
3. Measure the resistance between CAN-HIGH Terminal of MCU harness connector and CAN-HIGH Terminal of BMS harness connector.
4. Measure the resistance between CAN-LOW Terminal of MCU harness connector and CAN-LOW Terminal of BMS harness connector.

   Specification:  Below 1Ω

   Fig 1: Measuring Resistance Between MCU Harness Connector And BMS Harness Connector

   Courtesy of HYUNDAI MOTOR AMERICA
   Fig 2: C-CAN Connector Terminal

   Courtesy of HYUNDAI MOTOR AMERICA
5. Is the measured resistance within specification?

   YES 

   • Check Each Module 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.
   • Substitute with a known-good BMS and check for proper operation. If the problem is corrected, replace BMS and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

   NO 

   • Check for Open/Short in harness.
   • Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.