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Radiator Fan Relay Output

NOTE: For circuit identification and wiring diagram, see WIRING DIAGRAMS article. After each repair procedure has been completed, reconnect all components. Perform POWERTRAIN VERIFICATION TEST VER-2  under VERIFICATION TESTS to ensure system is functioning properly.
NOTE: The following test can be used for either low or high speed radiator fan relay output circuits.
  1. Turn ignition on. Using scan tool, actuate appropriate radiator fan relay. If radiator fan does not operate, go to next step. If radiator fan operates, system is operating properly at this time. Test is complete.
  2. Turn ignition off. Disconnect radiator fan motor harness connector. Measure resistance between ground and ground circuit (Black wire) at radiator fan motor harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in ground circuit.
  3. Turn ignition on. Using scan tool, actuate inoperative radiator fan relay. Measure voltage between ground and low speed radiator fan relay output circuit (Dark Green wire) or high speed radiator fan relay output circuit (Yellow wire) at radiator fan motor harness connector. If voltage is 11 volts or less, go to next step. If voltage is more than 11 volts, replace radiator fan motor.
  4. Turn ignition off. Remove appropriate radiator fan relay from Power Distribution Center (PDC). PDC is located in engine compartment. See Figure . PDC is located in engine compartment. See Figure . Connect a test light between ground and fused battery voltage circuit (Red/Light Green wire) at low speed radiator fan relay harness connector terminal No. 74 or high speed radiator fan relay harness connector terminal No. 79. See Figure . If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair open or short in fused battery voltage circuit.
  5. Measure resistance of appropriate radiator fan relay output circuit (Dark Green wire for low speed; Yellow wire for high speed) between terminal "D" at appropriate radiator fan relay harness connector and radiator fan motor harness connector. If resistance is less than 5 ohms, replace appropriate radiator fan relay. If resistance is 5 ohms or more, repair open in appropriate radiator fan relay output circuit.
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