Signal Circuit Inspection

IG key "ON", Engine "ON".
Perform "Oscilloscope" procedure in the "Vehicle S/W Management" with GDS.
Set "WIPER & MIST SWITCH" on "AUTO".
Measure the signal waveform between "Rain Sensor_LIN" terminal of "BCM" harness connector and chassis ground.
■ Reference data

Fig 1: Screen Display - Rain Sensor LIN Signal Waveform
Courtesy of HYUNDAI MOTOR AMERICA
Does the measured signal waveform follow the reference data?
YES
- Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
  → Repair or replace as necessary, go to "Verification of Vehicle Repair " procedure.
NO
- If the voltage of measured signal waveform is the battery voltage level (about 12V),
  → Check for short to battery in the LIN line.
  
  → Check for open/poor connection in the LIN line.
- If the voltage of measured signal waveform is the ground voltage level (about 0V),
  → Check for short to ground the LIN line.