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GS300 & GS400

  1. Remove cooling fan relay from underhood relay block. Relays are marked FAN NO. 1, FAN NO. 2 and FAN NO. 3. On all relays, ensure continuity is present between relay terminals No. 1 and 2. For relays No. 1 and 2, ensure there is continuity between relay terminals No. 3 and 4. For relay No. 3, ensure there is no continuity between terminals No. 3 and 5. If continuity measurements are not to specification, replace cooling fan relay. If continuity exists as described, go to next step.
  2. For relay No. 1, apply battery voltage and ground across relay terminals No. 1 and 2. There should be no continuity between terminals No. 3 and 4. Replace relay as necessary.
  3. For relay No. 2, apply battery voltage and ground across terminals No. 1 and 2. There should be continuity between terminals No. 3 and 4, and no continuity between terminals No. 3 and 5. Replace relay as necessary.
  4. For relay No. 3, apply battery voltage and ground across terminals No. 1 and 2. There should be continuity between terminals No. 3 and 5. Replace relay as necessary.
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