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Cooling Fan Relay (GS300)

  1. Disconnect cooling fan relay. See Figure. Remove cooling fan relay. Use an ohmmeter and check for continuity between terminals No. 1 and 2, and terminals No. 3 and 4. If continuity is not as specified, replace relay.
  2. Apply battery voltage between relay terminals No. 1 and 2. Using an ohmmeter, check for no continuity between terminals No. 3 and 4. If continuity is not as specified, replace relay.