Signal Circuit Inspection

■ Check Short to Battery in Harness 

1. Ignition "OFF"
2. Disconnect Auto Defog sensor and A/C control unit main harness connector.
3. Ignition "ON"
4. Measure voltage between Signal terminal of Auto Defog sensor harness connector and chassis ground.

   Specification  : approx. 0V

   Fig 1: Measuring Voltage Between Auto Defog Sensor Harness Connector And Chassis Ground

   Courtesy of HYUNDAI MOTOR AMERICA
5. Is the measured voltage within specification?

   YES 

   • Go to "GROUND CIRCUIT INSPECTION " procedure.

   NO 

   • Check for short to battery in harness.
   • Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.