Component Inspection

■ Check BCM 

1. Connect scantool to Data Link Connector (DLC).
2. Ignition "ON" & engine "OFF" & wiper "AUTO"
3. Measure waveform between terminal "C3" of BCM and chassis ground.

   Specification:  Refer the specifications in fig.2)

   Fig 1: Measuring Waveform Between Terminal C3 Of BCM And Chassis Ground

   Courtesy of HYUNDAI MOTOR CO.
   Fig 2: BCM Output Signal Waveform

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

   YES 

   • Go to  1Check rain sensor procedure.

   NO 

   • Substitute with a known-good BCM and check for proper operation. If the problem is corrected, replace BCM and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

■ Check rain sensor 

1. Connect scantool to Data Link Connector (DLC).
2. Ignition "ON" & engine "OFF" & wiper "AUTO".
3. Measure waveform between terminal "4" of rain sensor and chassis ground while sprinkling water on front window glass.

   Specification:  Duty cycle > 66.7% ± 3%

   Fig 3: Measuring Waveform Between Terminal 4 Of rain sensor And Chassis Ground

   Courtesy of HYUNDAI MOTOR CO.

   Fig.3 

   DUTY CYCLE REFERENCE
   
   

   Mode	Duty Cycle
   OFF	9.5% ± 3%
   Fault 1 Detected	23.8% ± 3%
   Fault 2 Detected	38.0% ± 3%
   Fault 3 Detected	52.4% ± 3%
   Rain Detected	66.7% ± 3%
   Low Speed Request	81.0% ± 3%
   High Speed Request	95.2% ± 3%

   Fig 4: Duty Cycle Of Rain Sensor

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

   ■ Duty cycle value will be fixed at 95.2%±3%, if fault 3 is detected.

   YES 

   • Check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

   NO 

   • Substitute with a known-good rain sensor and check for proper operation. If the problem is corrected, replace rain sensor and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.