Signal Circuit Inspection

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

■ Check for Open in Harness Between Water Pump Relay and A/C-ECU Unit

Ignition "OFF".
Disconnect Water Pump Relay and A/C control unit main harness connector.
Measure resistance between water pump relay signal terminal of relay connector and water pump relay signal terminal of A/C-ECU harness connector.
Specification: Below 1

Fig 1: Measuring Resistance Between Water Pump Relay Signal Terminal Of Relay Connector And Water Pump Relay Signal Terminal Of A/C-ECU Harness Connector
Courtesy of HYUNDAI MOTOR AMERICA
Is the measured resistance within specification?
YES
- Go to "Check for Open in Harness Between Water Pump Relay and Power Line " as follows.
NO
- Check for open in harness.
- Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

■ Check for Open in Harness Between Water Pump Relay and Power Line

Ignition "OFF".
Disconnect Water Pump Relay and Power Line main harness connector.
Measure resistance between water pump relay terminal of relay connector and battery and Ignition terminal of main connector.
Specification: Below 1

Fig 2: Measuring Resistance Between Water Pump Relay Terminal Of Relay Connector And Battery And Ignition Terminal Of Main Connector
Courtesy of HYUNDAI MOTOR AMERICA
Is the measured resistance within specification?
YES
- Go to "Check for Open in Harness Between Water Pump Relay and Water Pump " procedure.
NO
- Check for short to ground in control harness.
- Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

■ Check for Open in Harness Between Water Pump Relay and Water Pump

Ignition "OFF".
Disconnect Water Pump Relay and Water Pump unit main harness connector.
Measure resistance between water pump relay terminal of relay connector and water pump (+) terminal of water pump.
Specification: Below 1

Fig 3: Measuring Resistance Between Water Pump Relay Terminal Of Relay Connector And Water Pump Positive Terminal Of Water Pump
Courtesy of HYUNDAI MOTOR AMERICA
Is the measured resistance within specification?
YES
- Go to "Check for Open in Harness Between Water Pump (-) and GND " procedure.
NO
- Check for short to ground in control harness.
- Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

■ Check for Open in Harness Between Water Pump (-) and GND

Ignition "OFF".
Disconnect Water Pump Relay and Water Pump Unit Main Harness connector.
Measure resistance between ground terminal of water pump harness connector and chassis ground.
Specification: Approx. 1.0

Fig 4: Measuring Resistance Between Ground Terminal Of Water Pump Harness Connector And Chassis Ground
Courtesy of HYUNDAI MOTOR AMERICA
Is the measured voltage within specification?
YES
- Go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
- Check for short to ground in control harness.
- Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.