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Home >> Honda >> 2000 >> S2000 >> Repair and Diagnosis >> Engine Mechanical >> Cooling Fan >> Fan Controls >> Radiator Fan Switch Circuit Troubleshooting (Open) >> 2000-2005 Models

2000-2005 Models

  1. Disconnect the radiator fan switch 2P connector.
  2. Turn the ignition switch ON (II).
  3. Measure voltage between the radiator fan switch 2P connector terminal No. 2 and body ground.

    Is there battery voltage? 

    1. YES  - Go to step  4.
    2. NO  - Repair an open in the wire between the radiator fan switch 2P connector terminal No. 2 and main under-hood fuse/relay box.
      3. Fig 1: Measuring Voltage Between Radiator Fan Switch 2P Connector Terminal No. 2 & Body Ground
      G03692535Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. Turn the ignition switch to LOCK (0) , and check for continuity between the radiator fan switch 2P connector terminal No. 1 and body ground.

    Is there continuity? 

    1. YES  - Replace the radiator fan switch.
    2. NO  - Repair an open in the wire between the radiator fan switch 2P connector terminal No. 1 and body ground. If the wire is OK, check for a poor ground at G301.
      3. Fig 2: Checking Continuity Between Radiator Fan Switch 2P Connector Terminal No. 1 & Body Ground
      G03692536Courtesy of AMERICAN HONDA MOTOR CO., INC.
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