LIN Communication Line Inspection

Ignition "OFF"
Refer to Repair Procedures and remove necessary parts to get access to Rain Sensor connector.
Ignition "ON"
Back probe and measure signal waveform between Pin No. 2 (LIN) terminal of Rain Sensor harness connector and chassis ground.
Specification: Refer to below

Fig 1: Display - Normal LIN Communication Signal Waveform
Courtesy of KIA MOTORS AMERICA, INC.
Is the measured value within specification?
YES
- Go to "Component Inspection" 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.
- Repair or replace as necessary, go to "VERIFICATION OF VEHICLE REPAIR " procedure.