Signal Circuit Inspection

Check CAN high communication circuit
1. Ignition "ON" and Engine "OFF".
2. Connect scan tool and select VEHICLE SCOPEMETER function.
3. Measure waveform between terminal "BCM-IF-30" of IPM and chassis ground.
  Specification: CAN communication waveform is displayed
  
  Fig 1: Measuring Waveform Between Terminal BCM-IF-30 Of IPM And Chassis Ground
  Courtesy of KIA MOTORS AMERICA, INC.
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 step 2.
  
  NO
  
  Check for short circuit in signal harness. Repair as necessary and go to "VERIFICATION VEHICLE REPAIR " procedure.
Check CAN low communication circuit
1. Ignition "ON" and Engine "OFF".
2. Connect scan tool and select VEHICLE SCOPEMETER function.
3. Measure waveform between terminal "BCM-IF-39" of BCM ECU and chassis ground.
  Specification: CAN communication waveform is displayed
  
  Fig 2: Measuring Waveform Between Terminal BCM-IF-39 Of BCM ECU And Chassis Ground
  Courtesy of KIA MOTORS AMERICA, INC.
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 VEHICLE REPAIR " procedure.