LEMON Manuals: Even more car manuals for everyone
Home >> Honda >> 2000 >> S2000 >> Repair and Diagnosis >> Engine Mechanical >> Cooling Fan >> Fan Controls >> Radiator Fan Circuit Troubleshooting >> 2000-2005 Models

2000-2005 Models

  1. Check the No. 57 (20 A), No. 41 (100 A), and No. 42 (40 A) fuses in the main under-hood fuse/relay box, and the No. 20 (7.5 A) fuse in the under-dash fuse/relay box.

    Are the fuses OK? 

    1. YES  - Go to step  2.
    2. NO  - Replace the fuse(s) and recheck.
  2. Remove the radiator fan relay from the main under-hood fuse/relay box, and test it (see POWER RELAY TEST ).

    Is the relay OK? 

    1. YES  - Go to step  3.
    2. NO  - Replace the radiator fan relay.
  3. Measure the voltage between the radiator fan relay 4P socket terminal No. 1 and body ground.

    Is there battery voltage? 

    1. YES  - Go to step  4.
    2. NO  - Replace the main under-hood fuse/relay box.
      3. Fig 1: Measuring Voltage Between Radiator Fan Relay 4P Socket Terminal No. 1 & Body Ground
      G03692522Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. Connect the radiator fan relay 4P socket terminals No. 1 and No. 2 with a jumper wire.

    Does the radiator fan run? 

    1. YES  - Go to step  5.
    2. NO  - Go to step  6.
      3. Fig 2: Connecting Radiator Fan Relay 4P Socket Terminals No. 1 & No. 2 With Jumper Wire
      G03692523Courtesy of AMERICAN HONDA MOTOR CO., INC.
  5. Disconnect the jumper, and turn the ignition switch ON (II). Check for voltage between the radiator fan relay 4P socket terminal No. 3 and body ground.

    Is there battery voltage? 

    1. YES  - Go to step  9.
    2. NO  - Repair an open in the wire between the main under-hood fuse/relay box and under-dash fuse/relay box.
      Fig 3: Disconnecting Jumper & Turn Ignition Switch On (II)
      G03692524Courtesy of AMERICAN HONDA MOTOR CO., INC.
  6. Disconnect the radiator fan motor 2P connector.
  7. Check for continuity between the radiator fan relay 4P socket terminal No. 2 and the radiator fan motor 2P connector terminal No. 2

    Is there continuity? 

    1. YES  - Go to step  8.
    2. NO  - Repair an open in the wire between the main under-hood fuse/relay box and the radiator fan motor 2P connector terminal No. 2.
      3. Fig 4: Checking Continuity Between Radiator Fan Relay 4P Socket Terminal No. 2 & Radiator Fan Motor 2P Connector Terminal
      G03692525Courtesy of AMERICAN HONDA MOTOR CO., INC.
  8. Check for continuity between the radiator fan motor 2P connector terminal No. 1 and body ground.

    Is there continuity? 

    1. YES  - Replace the radiator fan motor.
    2. NO  - Repair an open in the wire between radiator fan motor 2P connector terminal No. 1 and body ground. If the wire is OK, check for a poor ground at G201.
      3. Fig 5: Checking Continuity Between Radiator Fan Motor 2P Connector Terminal No. 1 & Body Ground
      G03692526Courtesy of AMERICAN HONDA MOTOR CO., INC.
  9. Turn the ignition switch to LOCK (0).
  10. Disconnect the radiator fan switch 2P connector.
  11. Turn the ignition switch to LOCK (0). Connect the radiator fan switch 2P connector terminals No. 1 and No. 2 with a jumper wire, then turn the ignition switch ON (II).

    Does the radiator fan run? 

    1. YES  - Replace the radiator fan switch.
    2. NO  - Go to step  12.
      Fig 6: Disconnecting Radiator Fan Switch 2P Connector
      G03692527Courtesy of AMERICAN HONDA MOTOR CO., INC.
  12. Turn the ignition switch to LOCK (0). Remove the jumper wire, then turn the ignition switch ON (II). Measure the voltage between the radiator fan switch 2P connector terminal No. 2 and body ground.

    Is there battery voltage? 

    1. YES  - Repair an open in the wire between radiator fan switch 2P connector terminal No. 1 and body ground. If the wire is OK, check for a poor ground at G301.
    2. NO  - Repair an open in the wire between the radiator fan switch 2P connector terminal No. 2 and the main under-hood fuse/relay box.
      3. Fig 7: Identifying Jumper Wire Turn Ignition Switch On (II)
      G03692528Courtesy of AMERICAN HONDA MOTOR CO., INC.
scientia non olet · About LEMON Manuals