Signal Circuit Inspection

■ Check Short to Ground in Harness 

1. Ignition "OFF".
2. Disconnect Stop Lamp Switch and Stop Lamp Relay and HCU main harness connector.
3. Measure resistance between Signal terminal of HCU harness connector and chassis ground.

   Specification  : Infinity

   Fig 1: HCU Circuit Diagram With Connector End View

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

   YES 

   • Go to Next procedure.

   NO 

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

■ Check for Open in Harness 

1. Ignition "OFF"
2. Disconnect Stop Lamp Switch and Stop Lamp Relay and HCU main harness connector.
3. Measure resistance between NO terminal of Stop Lamp Switch harness connector and NO terminal of HCU harness connector.
4. Measure resistance between NC terminal of Stop Lamp Switch harness connector and NC terminal of HCU harness connector.

   Specification  : below 1Ω

   Fig 2: HCU Circuit Diagram With Connector End View

   Courtesy of HYUNDAI MOTOR AMERICA
5. Is the measured resistance within specifications?

   YES 

   • Go to Next procedure.

   NO 

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