ES300 1992-1997

Electric Engine Fan

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Fan Control Relay



Location

Specific to:

Lexus ES250 1990-1991

Lexus ES300 1992-1999

See Circuit Breakers in the Chassis Electrical section.

Testing

Specific to:

Lexus ES300 1997-1999

  1. Remove the relay box cover.
  2.  
  3. Remove the No.1 cooling fan relay. (Marking: FAN NO. 1)

    Click image to see an enlarged view

    Fig. Remove the No.1 cooling fan relay (Marking: FAN NO. 1)

  4.  
  5. Inspect the No. 1 cooling fan relay continuity. (DENSO)
    1. Using an ohmmeter, check that there is continuity between terminals 1 and 2. If there is no continuity, replace the relay.
    2.  
    3. Check that there is continuity between terminals 3 and 4. If there is no continuity, replace the relay.

      Click image to see an enlarged view

      Fig. Inspect the No. 1 cooling fan relay continuity (DENSO)

    4.  

  6.  
  7. Inspect the No. 1 cooling fan relay operation. (DENSO)
    1. Apply battery positive voltage across terminals 1 and 2.
    2.  
    3. Using an ohmmeter, check that there is no continuity between terminals 3 and 4. If there is continuity, replace the relay.

      Click image to see an enlarged view

      Fig. Inspect the No.1 cooling fan relay operation (DENSO)

    4.  

  8.  
  9. Inspect the No. 1 cooling fan relay continuity. (BOSCH)
    1. Using an ohmmeter, check that there is continuity between terminals 85 and 86. If there is no continuity, replace the relay.
    2.  
    3. Check that there is continuity between terminals 30 and 87a. If there is no continuity, replace the relay.

      Click image to see an enlarged view

      Fig. Inspect the No. 1 cooling fan relay continuity (BOSCH)

    4.  

  10.  
  11. Inspect the No. 1 cooling fan relay operation. (BOSCH)
    1. Apply battery positive voltage across terminals 85 and 86.
    2.  
    3. Using an ohmmeter, check that there is no continuity between terminals 30 and 87a. If there is continuity, replace the relay.

      Click image to see an enlarged view

      Fig. Inspect the No. 1 cooling fan relay operation (BOSCH)

    4.  

  12.  
  13. Install the No. 1 cooling fan relay.
  14.  
  15. Remove the No. 2 cooling fan relay. (Marking: FAN NO. 2)

    Click image to see an enlarged view

    Fig. Remove the No. 2 cooling fan relay (Marking: FAN NO. 2)

  16.  
  17. Inspect the No. 2 cooling fan relay continuity.
    1. Using an ohmmeter, check that there is continuity between terminals 1 and 2. If there is no continuity, replace the relay.
    2.  
    3. Check that there is continuity between terminals 3 and 4. If there is no continuity, replace the relay.
    4.  
    5. Check that there is no continuity between terminals 3 and 5. If there is continuity, replace the relay.

      Click image to see an enlarged view

      Fig. Inspect the No. 2 cooling fan relay continuity

    6.  

  18.  
  19. Inspect the No. 2 cooling fan relay operation.
    1. Apply battery positive voltage across terminals 1 and 2.
    2.  
    3. Using an ohmmeter, check that there is no continuity between terminals 3 and 4. If there is continuity, replace the relay.
    4.  
    5. Using an ohmmeter, check that there is continuity between terminals 3 and 5. If there is no continuity, replace the relay.

      Click image to see an enlarged view

      Fig. Inspect the No. 2 cooling fan relay operation

    6.  

  20.  
  21. Install the No. 2 cooling fan relay.
  22.  
  23. Remove the No. 3 cooling fan relay. (Marking: FAN NO. 3)

    Click image to see an enlarged view

    Fig. Remove the No. 3 cooling fan relay (Marking: FAN NO. 3)

  24.  
  25. Inspect the No. 3 cooling fan relay continuity.
    1. Using an ohmmeter, check that there is continuity between terminals 1 and 2. If there is no continuity, replace the relay.
    2.  
    3. Check that there is no continuity between terminals 3 and 5. If there is continuity, replace the relay.

      Click image to see an enlarged view

      Fig. Inspect the No. 3 cooling fan relay continuity

    4.  

  26.  
  27. Inspect the No. 3 cooling fan relay operation.
    1. Apply battery positive voltage across terminals 1 and 2.
    2.  
    3. Using an ohmmeter, check that there is continuity between terminals 3 and 5. If there is no continuity, replace the relay.
    4.  

  28.  
  29. Install the No. 3 cooling fan relay.

    Click image to see an enlarged view

    Fig. Inspect the No. 3 cooling fan relay operation

  30.  

 
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