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Cooling Fan Does Not Run

  1. Check 15-amp ENGINE fuse in interior fuse panel. Check 40-amp COOLING FAN fuse in main fuse junction panel, replace any blown fuses. If fuses are okay, go to step 4). If fuses blow repeatedly, go to next step.
  2. Remove 40-amp COOLING FAN fuse. Disconnect interior fuse junction panel 10-pin connector. Disconnect low cooling fan relay and high cooling fan relay. Relays are mounted on radiator cowl support. Measure resistance between ground and Black/White wire of interior fuse junction panel 10-pin connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, locate and repair short to ground in Black/White wire.
  3. Measure resistance of Black/Red wire between ground and left terminal of 40-amp COOLING FAN fuse holder in main fuse junction panel. If resistance is 5 ohms or more, reconnect all connectors and go to next step. If resistance is less than 5 ohms, repair short to ground in Black/Red wire.
  4. Turn ignition off. Disconnect cooling fan motor connector. Connect a jumper wire between ground and Black wire of cooling fan motor. Connect another jumper wire between positive battery terminal and cooling fan motor high speed circuit (Blue/Black wire) and then low speed circuit (Black/Yellow wire). If cooling fan operates at high and low speeds, go to next step. If cooling fan does not operate at high and low speeds, replace cooling fan motor.
  5. Turn ignition off. Measure resistance between ground and Black wire at cooling fan connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, locate and repair open in Black wire.
  6. Turn ignition off. Disconnect low cooling fan relay. Relay is mounted on radiator cowl support. Connect a jumper wire between positive battery terminal and Black/White wire terminal and Red wire terminal at low cooling fan relay. Connect negative lead of voltmeter to negative battery terminal. Measure and record voltage at Blue/Yellow wire terminal at low cooling fan relay. Connect another jumper wire between ground and low cooling fan relay Blue/Orange wire terminal. Again, measure voltage at Blue/Yellow wire terminal. If voltage is more than 10 volts with ground applied and less than 1 volt with ground not applied (relay is okay), go to next step. If voltage is not as specified, replace relay.
  7. Turn ignition off. Disconnect high cooling fan relay. Relay is mounted on radiator cowl support. Connect a jumper wire between positive battery terminal and Black/Red wire terminal and Black/White wire terminal at high cooling relay. Connect negative lead of voltmeter to negative battery terminal. Measure voltage at Red wire terminal at high cooling fan relay. Connect another jumper wire between ground and high cooling fan relay Blue/Green wire terminal. Again, measure voltage at Red wire terminal on relay. If voltage is more than 10 volts at Red wire terminal withground not applied and more than 10 volts at Blue/Black wire terminal with ground applied (relay is okay), go to next step. If voltage is not as specified, replace relay.
  8. Turn ignition off. Disconnect high cooling fan relay and low cooling fan relay. Relays are mounted on radiator cowl support. Turn ignition on. Measure and record voltage between ground and Black/White wire between low cooling fan relay and high cooling fan relay. Measure voltage between ground and Black/Red wire at high cooling fan relay connector. If both readings are more than 10 volts, check Powertrain Control Module (PCM) cooling fan circuits. See the
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