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Test NTC-13: Checking Radiator Fan Operation

  1. Turn ignition on with engine off. Using scan tool, actuate radiator fan control relay. If radiator fan cycles on and off, test is complete. If radiator fan does not cycle on and off, go to next step.
  2. Using scan tool, actuate radiator fan control relay. Using test light, backprobe radiator fan connector Light Green wire. If test light blinks on and off, go to next step. If test light does not blink on and off, go to step  4.
  3. Turn ignition off. Disconnect radiator fan motor connector. Using ohmmeter, check resistance between ground and radiator fan motor connector Black wire. If resistance is less than 5 ohms, replace radiator fan motor. Perform TEST VER-2A . If resistance is 5 ohms or more, repair open Black wire. Perform TEST VER-2A .
  4. Turn ignition off. Disconnect radiator fan control relay. Radiator fan control relay is located in Power Distribution Center (PDC). See Figure. Using test light, check for voltage at radiator fan control relay cavity No. 73 (Gray wire). If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair high resistance or open on Gray wire between radiator fan control relay cavity and fuse No. 6 in PDC. Perform TEST VER-2A .
  5. Disconnect radiator fan motor connector. Using ohmmeter, check resistance of Light Green wire between radiator fan motor connector and radiator fan control relay cavity No. 71. If resistance is less than 5 ohms, replace radiator fan relay. Perform TEST VER-2A . If resistance is 5 ohms or more, repair open Light Green wire. Perform TEST VER-2A .
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