Signal Circuit Inspection

Check CAN high communication circuit
1. Ignition "ON" and Engine "OFF".
2. Connect scantool and select VEHICLE SCOPEMETER function.
3. Measure waveform between terminal "B13" of BCM ECU and chassis ground.
  Specification: CAN communication waveform is displayed
  
  Fig 1: Measuring Waveform Between Terminal B13 Of BCM ECU And Chassis Ground
  Courtesy of HYUNDAI MOTOR CO.
4. Is the measured waveform within specifications?
  * The existence of CAN communication waveform itself shows there's no trouble in CAN communication circuit. If there's any short in harness, no signal is detected.
  
  YES
  - Go to " 2 Check CAN low communication circuit" procedure.
  NO
  - Check for short circuit in signal harness. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check CAN low communication circuit
1. Ignition "ON" and Engine "OFF".
2. Connect scantool and select VEHICLE SCOPEMETER function.
3. Measure waveform between terminal "B12" of BCM ECU and chassis ground.
  Specification: CAN communication waveform is displayed
  
  Fig 2: Measuring Waveform Between Terminal B12 Of BCM ECU And Chassis Ground
  Courtesy of HYUNDAI MOTOR CO.
4. Is the measured waveform within specifications?
  * The existence of CAN communication waveform itself shows there's no trouble in CAN communication circuit. If there's any short in harness, no signal is detected
  
  YES
  - Go to "COMPONENT INSPECTION " procedure.
  NO
  - Check for short circuit in signal harness. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.