Control Circuit Inspection

WARNING: This page is about a different variant/trim than selected.

■ Check for Open in Harness

Ignition "OFF"
Disconnect Auto Defog sensor and A/C control unit main harness connector.
Measure resistance between OPEN terminal of Auto Defog sensor harness connector and OPEN terminal of A/C-ECU harness connector.
Measure resistance between CLOSE terminal of Auto Defog sensor harness connector and CLOSE terminal of A/C-ECU harness connector.
Specification : below 1

Fig 1: Measuring Resistance Between OPEN Terminals Of Auto Defog Sensor And A/C-ECU Harness Connector
Courtesy of HYUNDAI MOTOR AMERICA
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

Ignition "OFF"
Disconnect Auto Defog actuator and A/C control unit main harness connector.
Measure resistance between OPEN terminal of Auto Defog actuator harness connector and chassis ground.
Measure resistance between CLOSE terminal of Auto Defog actuator harness connector and chassis ground.
Specification : Infinity

Fig 2: Measuring Resistance Between CLOSE Terminals Of Auto Defog Actuator Harness Connector And Chassis Ground
Courtesy of HYUNDAI MOTOR AMERICA
Is the measured resistance within specification?
YES
- Go to "COMPONENT INSPECTION " procedure.
NO
- Check for short to ground in control harness.
- Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.