Signal Circuit Inspection

■ Check for open or short in harness 

1. Ignition "ON" & engine "OFF".
2. Measure waveform between terminal "C1" of BCM ECU and chassis ground.

   Specification:  Signal waveform of LIN Line communication

   Fig 1: Measuring Waveform Between Terminal C1 Of BCM ECU And Chassis Ground

   Courtesy of HYUNDAI MOTOR CO.
3. Is the measured waveform within specifications?

   ■ The existence of LIN communication waveform itself shows there's no trouble in LIN communication circuit. If there's any open or short circuit in harness, no signal is detected.

   YES 

   • Go to Power Supply Circuit Inspection  Power circuit Inspection procedure.

   NO 

   • Check for open or short in signal harness. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.