Signal Circuit Inspection

■ Check for Open in Harness 

1. Ignition "OFF"
2. Disconnect Auto Defog actuator and A/C control unit main harness connector.
3. Measure resistance between Signal (F/B) terminal of Auto Defog actuator harness connector and Signal (F/B) terminal of A/C-ECU harness connector.

   Specification  : below 1

   Fig 1: Measuring Resistance Between Auto Defog Actuator Harness Connector And A/C-ECU Harness Connector

   Courtesy of HYUNDAI MOTOR AMERICA
4. Is the measured resistance within specification?

   YES 

   • Go to "Check Short to Ground in Harness " as follows.

   NO 

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

■ Check Short to Ground in Harness 

1. Ignition "OFF"
2. Disconnect Auto Defog actuator and A/C control unit main harness connector.
3. Measure resistance between Signal (F/B) terminal of Auto Defog actuator harness connector and chassis ground.

   Specification  : Infinity

   Fig 2: Measuring Resistance Between Auto Defog Actuator Harness Connector And Chassis Ground

   Courtesy of HYUNDAI MOTOR AMERICA
4. Is the measured resistance within specification?

   YES 

   • Go to "POWER CIRCUIT INSPECTION " procedure.

   NO 

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